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Do you know the classification of the speakers in professional audio.
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The current level of program source device and the power amplifier has been done is very high, the sound system consisting of a high-quality audio, high
-quality amplifier and speaker system, the playback quality depends primarily on the speaker of the Speakers also known as speaker systems, it is
extremely important aspect of the sound system. Great sound playback quality of the entire sound system.
Speaker classification, common in the professional audio, classified as follows:
1 by the use of the occasion: divided into two major classes of professional speakers and home speakers. Home speakers are generally used for home
playback, which is characterized by delicate playback sound quality and more refined appearance `beautiful, the playback sound pressure level is not too
high to withstand the power is relatively small. Professional speaker in general for the dance hall `karaoke hall` theaters `halls and sports stadiums
and other entertainment venues. The high sensitivity of professional speakers in general, the playback sound pressure, intensity, and to withstand the
power compared with home speakers, the sound quality rigid, the outlook is not very sophisticated. Professional speaker in the monitor speakers, its
performance home speakers closer to the appearance is generally more sophisticated `small, such monitors are often used in home Hi-Fi sound system.
2 Press the playback frequency: can be divided into full-band speakers bass speakers and subwoofer. The so-called full-band sound is able to cover
the low-frequency `IF and high frequency range playback of audio. Full-band sound of lower frequency is usually 30Hz-60Hz, maximum frequency of 15KHz-
20KHz. Only in the small and medium sound system with a pair or two pairs of full-band sound to fully take on the task of playback. The bass speakers and
subwoofer are generally used to supplement the full-band sound of low frequency and ultra-low frequency sound for speakers. The type of speaker is
generally used in the `medium-sized sound system, to strengthen the sense of the intensity of low frequency sound and shock. Use, mostly through an
electronic crossover (crossover) frequency division, the low-frequency signal into a dedicated bass amplifier, and then push the bass or subwoofer.
(3) by end-use: generally divided into the main playback speaker. Monitors and back to listen to speakers. The main release the audio speakers are
generally used as the main speaker sound system, bear the main playback tasks. The main level audio speaker performance to a great impact on the quality
of the playback of the entire sound system, can also choose the full-band speakers plus subwoofer combination playback.
Monitors for the control room, recording studio for program monitoring use, it has a small distortion, wide and flat frequency response, very little
modification to the signal characteristics, most of faithfully reproducing the original appearance of the program. Back to listen to the speakers, also
known as stage monitors, and general use for the actors or members of the band on stage or in dance halls to listen sing or play sound. This is because
they are located behind the main playback speaker on the stage, can not listen carefully to their own sound or the band playing acoustic, it can not be
well with or find the exact feeling, seriously affecting the performance effects. Generally return to listening to the bevel-shaped speakers made, on the
ground, which can be placed on the stage will not affect the overall shape of the stage, but also on the stage to listen carefully to playback, not
caused by audible feedback to the microphone howling.
The press box structure: can be divided into a sealed speaker, vented speakers, labyrinth speakers, acoustic tube speaker and multi-cavity resonator
speaker and so on. Which professional speakers used the most is inverted relative to the speakers, which is characterized by wide frequency response,
high efficiency, sound pressure, in line with the type of professional sound system speakers, but because of its low efficiency, it is less professional
speaker applications, mainly for home speakers, only a few monitor speakers with closed box structure. Sealed speaker has the advantages of simple design
debugging, wide frequency response and good low-frequency transient characteristic, but the higher the requirements of the dial sound unit. In a variety
of speakers vented speaker and sealed speaker occupied the majority of the proportion of many structures in other types of speakers, but the proportion.
To see large unknowingly hurt hearing
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Interview experts: Jiangsu Province People\\ s Hospital, Department of Otolaryngology, Chief Physician, Professor Bu line width
Subway, bus, wearing headphones to listen to the music young people everywhere, in a noisy environment and carve out their own temporary Fang Anjing one of the world.
Cinema, large competing staged, packed, people enjoy the thrill of the pursuit of audio-visual.
Chinese New Year, there will always be fireworks to add to the fun …
But you know, the \"Walkman\" maximum output of up to 105-120 decibels, the noise intensity in the cinema up to 120 decibels, the sound of firecrackers of up to 140 db, and if the noise is more than 1 minute and 30 seconds of exposure intensity of 110 db or instant contact with the noise of 140 db, as soon as hearing loss occurs. China\\ s famous ear and audiologists, the President of the Center of the WHO cooperation for the prevention of deafness and hearing loss, Jiangsu Province People\\ s Hospital, Department of Otolaryngology, Chief Physician, Professor Bu line width appeal to the general public to protect your hearing, healthy ears.
Electronic noise hazards are surge
In recent years, lead to deafness due to environmental noise pollution has been growing steadily, according to WHO statistics, in all human deafness etiology, noise after aging, came in second, accounting for about 37%. From the physiological point of view, any interference with people to rest, study and work the sound of unwanted sounds, collectively referred to as noise. Common noise include the following: industrial noise, such as industrial production machine rotation, vibration, mechanical noise; traffic noise, whistle sound, the noise of train travel; musical instruments of social life, noise, dance halls, discos tone, household washing machines, air-conditioning noise.
China is in the modernization, industrialization, urbanization and rapid development of large-scale urban and rural construction of industrial noise, construction noise, transportation noise and social life noise surge. In addition to these, the popularity of personal electronics audio products also noise pollution have increased. \"Walkman\" maximum output up to 105-120 decibels, the noise intensity in the cinema up to 120 db, the public to enjoy the lifestyle at the same time, it may have to make the hearing has been compromised.
Noise damage is systemic
The noise is a class cause irritability or volume is too strong and harmful to human health voice. Strong noise environment does not take protective measures will not only lead to permanent hearing damage, and the various systems of the body will have a serious impact. Noise damage and its extent depends on the noise intensity and exposure time. Continuous exposure to 85 db above the noise environment may cause hearing loss, hypertension, insomnia, digestive disorders and other diseases, harmful to students\\ learning and behavior. If the contact strength of 110 db of noise more than 1 minute 30 seconds, or instant contact with the noise of 140 db, it will immediately hearing damage occurs.
\"Walkman\" should be used in a quiet environment.
In normal life, pay attention to reduce the hazards of the \"electronic noise\" is very important to protect your hearing. To pay attention to in their daily lives to reduce the volume of radio, television and other audio equipment, try not to press the car horn, not loudly, as little as possible to participate in a noisy sports and less listening to rock music. \"Walkman\" should be used in a quiet environment, try not to be in the subway and public spaces, noisy place with, do not open up the volume to stimulate the pursuit of trying to cover up the ambient noise at the expense of their own hearing. Experience has shown that: use Walkman not hear others talk, it means that too high a volume, it is timely transfer of small, but not after prolonged listening.
Appear immediately after noise exposure, such as tinnitus or ear still muffled feeling, or are able to hear the speech does not understand the meaning, we must guard against noise damage, you should go to the hospital.
Links: environment, some sound decibel
Whispering: 30
Quiet offices, libraries, housing: 40
Rain, refrigerator, office: 50
Washing machines, air conditioners, electric shaving :50-75
Normal conversation was: 60
Vacuum cleaner, hair dryer, alarm clock :60-85
Toilet :75-85
Telephone call, doorbell, whistling kettle: 80
Noisy hotel, a blender or food :80-90
Motorcycle, motorboat :95-120
Walkman :105-120
The highest volume of the TV, car horns, disco, infant crying, or front of the ear shouting: 110
Car audio, cinema, gym, band: 120
Electric drill, electric percussion, noisy toys: 130
The plane took off, firecrackers :140-155
Shooting, artillery :160-9,170
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Ningbo lighting audio video forum for the exchange ended in 2012
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Ningbo lighting audio video forum for the exchange ended in 2012
Recently, the city cultural centers, city theater company collaborative Ningbo Xin Huang Intelligent Engineering Co., Ltd. 2012 Ningbo lighting audio video exchange Forum \"held at the Sheraton Hotel. The forum has been the
guidance and support of the Media Bureau, the backbone of the competent and professional sectors of the counties (cities) and districts cultural institutions, performing arts companies, theater companies, television stations, part of
their education systems participated in the meeting.
QSC from the United States, Germany, Sennheiser and Roland, Yajiang photoelectric Soundking (sound) and other domestic and foreign well-known brands to participate in the forum display and exchange. Over the years, the
brand has been used in the top event of the Olympic Games, World Expo, Asian Games and major concerts at home and abroad. Display and exchange of the well-known brands to participate in this forum, the new bureau of the
City, SMG, Li Bao-fu, deputy director of a sincere welcome said in his speech and pointed out that in Ningbo City, the 12th Five-Year Plan \"in the Municipal City Government clearly strengthen the development and support of mass
culture and career development, to further enrich and enhance the context of people\\ s cultural life, the brand businesses develop their own, fueled the development of mass culture in Ningbo, will be able to obtain greater economic
and social benefits.
City cultural centers, Lin Hong, the curator said, the organization of this forum is designed to allow delegates the exchange and sharing all of the advanced technologies and products of domestic and international lighting, sound,
and video industry leading to excellent performance, on the basis of the original equipment and facilities, government departments support and functional departments around the efforts to further the development, construction
and updating, so that the people at home can enjoy the perfect sound, visual effects. Jiangbei District, cultural curator Dong Feng happy in an interview with reporters, said the city cultural centers the cultural sector as a grass-roots
\"leading pack\" for organizing this forum is indeed a great learning opportunity for cultural units, but also for the next step, cultural centers, primary palaces of light, sound, video, development and construction provides a more
complete reference.
Car Audio Speaker amplifier integrated non-destructive upgrade
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Many car owners looking forward to have a high quality car audio, can be a lot of people do not want the converted audio and any changes to the car interior, so caught in the dilemma. However, a new speaker-24/">car audio speakers and amplifier into one that will help riders solve this problem. The so-called speaker amplifier integration of sound set of speakers built-in amplifier and HOD sense of hearing technology in a new product, simply each speaker audio characteristics of the vehicle environment, specifically supporting a human ear, car ideal to listen to the sense of the effect of output characteristics of the product. The characteristics of this product under the premise of ensuring the sound quality upgrade, the original car stereo without damage upgrade. Damage upgrade in the modified car audio, automotive sheet metal structures and the car interior without any damage and changes, upgraded sound system on the original car electronic devices functionality and electricity system does not cause any interference and conflicts to to ensure traffic safety, In addition, an upgraded audio system, power must be adapted to the energy reserves of the original car, to avoid the vehicle power supply system to work overload, leading to shortened life expectancy of the battery or generator. There may be riders have doubts about the sound of this new type of audio equipment, to this end Mahone to find an Accord car equipped with the audio device to personally experience. The first is to install in the car did not see any traces of the changes to the interior, line, etc. audition the sound, the sound clear and sweet, clean sound and thorough, no difference in feelings with the family HiFi sound. However, the reporter seems, there are two things wrong, such as the bass, feel the impact and shocking less than a reporter\\ s request, in addition to its subwoofer is installed in the trunk of the vehicle, due to the larger, so more space However, fish and can not have both, the most expensive of the sound is not a few thousand dollars, its unique features and a higher price, is definitely worth some of the riders to consider.
What is the home audio system which is characterized by how the central
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What is the central home audio system? How its characteristics?
What is the central home audio system:
Home central sound system is a more professional name. Its meaning is achieved through a smart host to the whole house music system. Users can have any space anywhere in the home heard the high-quality, high-fidelity stereo music, and each room can be independent, intelligent, personalized control and operation, such as: free on-demand, source selection, volume control, timer switch time, call mute, and so on.
His main purpose is different according to the needs of those home-loving on-demand personalized music program, and different areas to achieve independence at home on demand, without disturbing each other. This allows you to every corner of the home such as: living room, bedroom, study, dining room, kitchen, bathroom, balcony, roof terrace and other places at any time to listen to music, make music, slow and graceful flow of your day s work to relieve tension and fatigue, independent personality in your family free to enjoy the music space to bring a better life. In addition, a weekend, you can also invite friends and family at home on the concert will be held in Kara OK or party. BYRON one hundred sharp smart host in the hard disk can store vast amounts of MP3, MP4 and VCD (MTV) songs, love to meet different
People of different ages and needs.
Home central sound system features:
1, the central control:
Is central to the smart host as the core source. By the host before the LCD touch screen to control the whole house of music playback. Also can be personalized by the owner in his room control.
2, the regional independent:
Each zone can be independently controlled without disturbing each other.
2, the operational intelligence:
No external sources, without just stay in the living room, without complex operation, the whole house audio system using the controller with a switching terminal, so that music is as simple as turn on the lights. Installed in the room on the LCD touch screen control panel, just a tap, music in the room immediately flowing, elegant and stylish LCD panels also make your living space science and technology have become more promise.
3, built-in large capacity hard disk:
Creative solution to the problem of home stereo audio sources. BYRON not one hundred sharp or insert any need for external audio equipment. Unlike traditional home stereo needs an external CD discs, MP3 discs, U disk and other complicated procedures, and a small number of external music sources, not demand, not fun, can not really enjoy the background music of infinite charm. Built-in large capacity hard drive to solve all these problems.
4, choose Personalize, to free on-demand music:
The embedded design, built-in large capacity hard disk. Hard disk can store vast amounts of MP4, VCD and MP3 programs. Comprehensive family of different people to meet individual music needs. Such as: the home of a child can hear the whole set of fairy tales, songs, English language teaching materials. Once the home of the elderly can listen to the whole opera, drama programs. You do not need these any external devices, all programs can all be stored in the hard disk and can be set in advance on demand. The time to listen directly to the tap room to open the control panel on it. Very convenient, simple and fast. Borrow 一句广告词 \"I point my music.\" Want to hear what hears nothing, it does not Miaozai.
5, four-way radio functions:
With professional-grade high-sensitivity FM tuner, you can also listen to different regions of different FM program. Each region are independent operations.
6, the background music combined with Kara OK function:
Families with 100 sharp while background music is equivalent to have a professional-grade home karaoke OK player. The perfect combination of audio and video technology, so that the family needs of each person s musical preferences can be customized to achieve the significance of the product. TV host can be connected with the smart, hard disk where you can point to sing karaoke OK song or watch other video programs such as: family digital photos, wonderful movies, home videos, etc. Hard disk can be built massive Hominid original singers of the classic MTV music library, matched with high-fidelity stereo sound, home offices can have a K-star treatment.
7, full-function menu display:
All functions and settings are available through 1) front panel LCD touch screen; 2) room LCD control panel display and operation. Song way: the main menu, sub menu, the regional classification of the menu. Song selection methods are: alphabet song, song codes, song by singer name, song categories (pop, classical music, Chinese music, European music, etc.) the name of song by the composer, etc.
A good horse with a good saddle two professional audio battery recommended
As we all know most of the mobile electronic products, the demand for and performance of the battery is very dependent, I
remember ten years ago, alkaline battery has just been published, its durability and performance is much stronger than carbon-zinc
batteries, it is necessary to stress performance electronic products, such as cameras, video games or portable listening devices such as
Yan material. The car is also a mobile machine, also need power operation, the same need for a battery. But one thing is not the
same car with a self-sufficient power generation systems, in addition to supply automotive electrical systems, but also for their
batteries. So the car can keep up to repeated use of the power supply system failure only need to replace aging batteries or
generators.
However, the car is also troubled by the power of energy, if the generator power is too much effect on engine power output and
fuel consumption of vehicles, such as the use of excessive battery load and the generator will increase the weight of the car, So
today s car manufacturers in the design of the use of computing power when the car is very accurate. Because of this, the car s
electrical system can supply us with enough top-level audio equipment enthusiast to install it? Answer is yes, but not enough.
We can take the high-class car audio equipment, but to achieve the best equipment, the power supply is an important factor, and
the car power system control of the important factors. So how to enhance the vehicle electrical system is an important part of today s
car audio. In the past may install and use a large capacitor thick power cord and so on. We are here to give car audio enthusiasts will
bring two cars to enhance the professional automotive power systems.
U.S. Shiding Ge SPV20
SPV has two series, we introduced the SPV (yellow top) line is more suitable for use in China, because he has a strong addition to the
power output, but also has a higher durability.
SPV20 parameters
300MaxAmps, 600Watts
? Internal resistance: <6 Micro Europe, that is extremely rapid transmission capacity, the number the faster the more low-speed
(faster than the original battery charge more than double)
? 20 hours rate: 1.0A/20Ah
? 5 hours rate: 3.4A/17Ah
? 0.5 hours Rate: 25A/12.5Ah
? Low starting current (-17? C): 230 An
? 5 seconds start amperage: 300 A
? Weight: 6.7 kg
? Volume (L x W x H): 18×7.6x19cm
? Polarity: Left – (black, negative), R + (red, positive)
Taobao Price: 1650 yuan
U.S. source of SQB2000
United States is a source of high-performance multi-purpose energy SQB2000 battery, whether for daily vehicle or will custom racing
vehicles. It has impressive power and exceptional performance of the high cost, regardless of car audio professionals or beginners
would be a good choice. Moreover, suppression of its high density glass fiber (AGM) technology design and compact size allows
customers to install more perfect.
SQB2000 parameters
? Strong AGM technology (suppression-type glass fiber)
? Power consumption 100%, 300 times the number of reciprocating charging; (normal cells only 1-2 times)
? 5 seconds start amps: 525 Ann
? Reserve energy: 33AH
? Removable brass battery terminal
? Weight: 10 kg
? Size Dimensions (W x D x H): 19.6×13.1×15.5cm
Taobao Price: 2000 yuan
Readers may ask that any advantage of the benefits of car audio system, but you know, car audio is the main provider of battery
power. In today s automotive electrical system design, when the battery after starting the engine, then to enter standby mode.
When the car built for the computer detects that the battery power consumed when starting the engine, the generator will be
notified of the supplement. The modified audio equipment after the main part is to take power in the battery, which means when
the sound starts after the battery power will often be taken away, while the car has to constantly charge the battery again and
again. One can imagine a high-speed battery charging, capacity and number of iterations of the car battery to power the system has a
good benefit. And has a stable and durable battery is definitely the performance of car audio equipment is very helpful for the Need-
class audio equipment to help even more important.
Auto EQ category, the main parameters and functions
1, the equalizer categories:
A, graphic equalizer, equalizer only such center frequency and bandwidth at a fixed rate on the adjustment of the control is usually
composed of a number of sliding potentiometer, potentiometer formed by the “graphic” as the name suggests, like the frequency
response curve implementation of the equalizer.
B, parametric equalizer: This type of equalizer parameters can be adjusted year-old some balance, frame rate, frequency, width, etc.,
generally used for game enthusiasts of vehicles or sound systems, expensive, require specialized debugging.
C, digital equalizer, DSP (digital signal processing), you can edit all the pieces do not rate band, and stores them in memory, the form
such as rock, blues, symphonic, vocal and other musical styles, equalizer a most attractive professionals.
2, the equalizer of the main parameters:
A, signal to noise ratio;
B, total harmonic distortion;
C, frequency response;
D, the maximum input and output level;
E, input gain;
F, PFM frequency;
G, the number of input channels negligence (RCA);
H, input and output impedance;
I, EQ center frequency;
J, like balanced input noise suppression;
K, the input / output impedance;
3, the equalizer function:
A, calibration frequency audio distortion produced by the device to be flat response;
B, to improve clarity and naturalness;
C, to improve the uniformity of production vehicle to ensure flat frequency characteristics.
Jiang Sheng modified not to much to win
With the increased pace of life that many people every day, “live” time in the car, or even to much more than the house, therefore, a
good modern car, in addition to sit comfortably, the car is not that sweet, sweet music seems to be called is a good car. To have a
pleasant sweet music, the appropriate course the car audio system, how to choose the right car to their own sound it?
For a car audio beginners can be described as cautious and careful, first find out what your car stereo in the end lack of “tone” and
then choose the most important music is based on personal preferences to choose equipment. If you like lyrical music, it is not
necessary to install the large equipment. Basically, I listen on the appropriate plus one suite with a unit and then be able to meet the
low-frequency unit is sufficient. If the player itself is rock music lovers, and often have a shock effect, high-power digital amplifier and
high-power large-diameter subwoofer is indispensable.
Good car audio, definitely not a simple amplifier to a car safety, plus a few medium and small speakers can. Carpenter is not much more
to the U.S., the more is the winner. If some of the equipment, not a good design, installation, commissioning, more even the best
equipment, not able to sing good music, on the contrary, improper installation, the playback of music, like a caged crow respective
barking, can only spend money by selling to the crime.
Good car audio design, in addition to matching a good audio equipment, the sound field layout is a decisive factor. In this regard, the
speaker position, tone rate level should fully take into account, making the car sound field coverage be expanded to cater to the full.
In addition to the sound field, speakers and other playback equipment, but also inside the environment quiet enough to be able to
make these devices into full play. In this regard, shock-absorbing panels for the automotive installation is necessary so that the driving
engine, the friction caused by the body and wind noise, being passed inside, can be effectively isolated from the shock-absorbing
panels. In addition, a stable power supply is the last to be taken into account. Ensure that the supply voltage source will not be
affected by instability.
Car audio assembly process should pay particular attention to the following: First, treble tenor also point to as close as possible is also
very important, too far away or if it points to a serious deviation would be a serious off frequency of the phenomenon, the store has
extensive experience in the modified The technician will be for you to consider these issues. In addition, the door should be added
within a shock-absorbing panels to prevent resonance caused by self-suppression effect. Low speaker may choose a large wooden box
should do, is more than most backward box (with the kind of hole) and closed box, the same unit will be very different style of box
differences, how to choose?
Can be divided into two steps: 1, unit selection, fast songs slow songs + select the most appropriate unit you think! 2, the selected
unit by unit within the requirements and then pick speakers! Wire should not ignore the important, complex theories do not talk
about, that straightforward: poor signal transmission wire will power consumed in the process of which (like Shagou water
“infiltration”), resulting in no active rate!
The economic and practical step by step car audio players may wish to purchase equipment, this method can not at once that wallet
bleeding, and can be assembled to good equipment. However, this method, the first player to plan a good investment plan, listing the
purchase list, based on urgency has to arrange the purchase of components. This gradually acquired, the last car purchase can be that
good equipment to get the highest audio experience while upgrading the fun each time.
How to Select a car horn
speaker, car audio host is the most important part, just like the human brain, what kind of sound to be issued, may be controlled by
the brain. The speaker is like the human voice, the sound is sweet, it is necessary to see how the voice.
Speaker known speaker, its role is to convert the audio signals to acoustic signals radiated around the air medium. Car speaker cone
design with the most common, which is installed in the vehicle because space is limited in the case, tapered design can be expanded
as much as possible the effective area of the diaphragm, and diaphragm determines the effective area of the low-frequency response
speaker . In other words, tapered design can not install bass case, bass.
Accordance with zoning, the speaker can be divided into full-frequency, low frequency, medium frequency and high frequency of four
kinds. Form of energy conversion can also be divided into electrical, electromagnetic, piezoelectric, electrostatic and tablet, electric
vehicle to the main speaker.
That is coaxial speakers full-range speakers, it s woofer and tweeter is designed in the same center line, the outside is low, the inside
is high, but the vocal point in the same physical location. This design can eliminate the high and low frequency units due to the
frequency range of different sounds caused by drift, but because of the high, the bass is emitted from a point, so the larger the
distortion sound.
Divided into 2-way loudspeaker frequency and divide by 3, 2 divided by the tweeter and woofer components, divide by 3 is coupled
with the midrange unit. Because each unit is responsible for different frequencies, broaden the frequency range, so as to solve the
problem of sound distortion. However, because daily life, we hear the sound basically sent from one point, while the frequency
emitted by the speaker frequency of each unit, the installation of the physical location are different. In this way, there will be voices
drift phenomenon. In addition, the high, although the bass unit is responsible for different frequencies, but it is bound to the
existence of a critical point, so in a different position, given the same frequency, will produce acoustic interference.
To solve these difficulties, we must use the role of divider. Crossover As the name suggests, is to separate the different frequencies,
and sent to a different speaker unit. Of course, its function is not only this, it is also based on the characteristics of the speaker to
make proper adjustments in order to reduce distortion and interference.
Nominal Impedance: speaker at a particular frequency when measured at the input impedance value, it is the speaker sound system
with other parts of the important parameters match. If the data and power amplifier with a nominal impedance, there will be sound
distortion.
Sensitivity (SPL): When the speakers with 1W power of noise signal in the axial direction of the sound pressure level measured at 1m,
which is reflected in the size of the speaker sound performance skills. When the optional speaker, to try to make both sides of the
consistent values (within ± 1dB control), or there will be very clear sense of focus.
Man that each find a new car stereo dealer, you can get new information. No one thought, different stores recommended
merchandise, are there so many the same things. Such as the host inside the Alpine and Sony, and the speaker of the MB. Two
stores are located in Beijing s north and south ends, and their manager recommended the same brand, the market still seems to
occupy a certain weight. But through these two interviews, I found the price difference between the different stores is still very
large. There are audio conversion needs a few owners may wish to look at, look at market conditions, as in the modified time “pay
back the money in place” to prepare.
new style of music audio conversion / Hz frequency set
New music style audio conversion
Four double glazed
Hz frequency set 2 sets
Model: EV165
A Black Hawk Amplifier
Model: BL-B4B28R
Very good sound quality