Many car owners are rushing to modify the store to carry out car audio conversion, and there is great hope for the modification. After the car audio conversion is completed, it is greatly disappointing, and even there is a feeling of being deceived. What kind of sound is changed, and the sound quality of my original car audio is not good! After several entanglements, the modified shop has a statement of the modified shop, the owner of the car has the owner's statement, who is right and who is wrong? 2) Set the volume of the amplifier (GAIN) to the lowest position (MIN) third step: Load Cell Module,Weighing Module,Weigh Modules Load Cells,Module Weighing Xiaogan Yueneng Electronic Technology Co., Ltd. , https://www.xgsensor.com
Why are some car audio modifications not achieving the desired state? For this question, let's listen to Mr. Pan's statement from Wuhan Songshan Car Audio Refit Shop.
Preparation before tuning 1) Restore all the additional functions of the main unit to the factory default state. All the high, medium and low sounds are centered, that is, they are not increased or attenuated. The front and rear sound fields and left and right balances are also the same. (This state is called the intermediate state for the time being. The advantage of this is that even if the recording effect of each disc is different, we can use the adjustment function to add some treble and bass to supplement, otherwise, we can use To cut)
3) FILTER (filter setting) is set to OFF
4) CROSSOVER (cutoff frequency) is set at the lowest (as shown in the figure is 50HZ)
5) The subwoofer amplifier is also treated like this. Why? Next I explain step by step.
Tuning begins!
first step:
Open the host, play some high-fidelity vocal discs or bass dynamics, and turn the volume to half or 3/5. The practice here is different from the textbook. The textbook is to adjust the amplifier to the maximum. Undistorted power output, the reason I do this is:
First, the so-called tuning master of the modified shop is also very dish, many people may not be divided into the critical point of distortion. As a car owner, there is no such experience.
Second, many stores and owners do not know the importance of the bass. In order to accommodate the price, the subwoofer and bass amplifier are often barely enough. The sound pressure of the current sound field is up, and the subwoofer can't keep up. My approach makes it easier to match the bass and the mid-bass of the front sound field, making it easier to produce a full bass.
The second step: 
As shown in the figure, if CHANNEL-1/2 is connected to the front door horn (front sound field) and CHANNEL-3/4 is connected to the rear door horn (rear sound field), then we first twist the CHAINL-1/2 GAIN until the sound Very big, or the maximum sound you can accept. Next, we will turn down the volume of the main unit, put a vocal disc or a low-frequency disc, and then slowly open the main unit until it is normal. Listening is a little louder, well, then you should listen carefully, is the voice clear? Will there be a nasal sound? Or is the voice biased? (This is actually one of the methods to check the quality of sound insulation and shock absorption without disassembling the door. If the sound is clear and there is no nasal sound, or the low frequency comes out very well, there is no trailing "å—¡å—¡" sound, the low frequency will not be affected, then Congratulations, your front door sound insulation and shock absorption installation is basically perfect, in this state, your front door bass will play the best state.)
Five steps to teach you to easily transfer good music, car audio tuning is as simple as that
In the current fast-food installation, the probability of the second step is not high. Let's talk about the actual situation. Usually, when the volume of the host is increased, there will be a nasal sound, just like a cold, or feel. The pronunciation is unclear, and there is a "beep" tail when there is a low frequency. These conditions are the so-called resonance sounds that affect the clarity of the sound. Resonance will cancel the details of many sounds, slow down the low frequency of the sound, and turn your 5W audio equipment into a 1W sound.
Is there any way to eliminate resonance? Sound insulation and shock absorption is a means, in addition we can reduce the probability of this sound through the CROSSOVER (cutoff frequency) on the host or amplifier, we look at the picture, you can try to set the FILTER (filter setting) to HP ( Qualcomm) position, CROSSOVER (cutoff frequency) knob twisted to 60HZ\70HZ\80HZ\90HZ or even 100HZ, FILTER (filter setting) and CROSSOVER (cutoff frequency) are used together, FILTER (filter setting ) Only in the LP or HP state, the CROSSOVER (cutoff frequency) adjustment will have an effect. In the case of unclear sound, we try to rotate the CROSSOVER (cutoff frequency) to see the nasal sound of the vocal at that position. Disappeared or the low frequency has no "beep" sound, if it is near 60~70HZ, then, congratulations, the sound insulation and shock absorption is still doing well, go on the courier, if it is near 80~90HZ, but the store will collect you. Cheap, you may wish to discuss with the construction staff to see if there is any possibility of improvement. If there is no nasal sound and snoring in the vicinity of 100~120HZ and the store has collected you expensive, then you can play your talents and play the country. If it is cheap, then forget it. Who told you to be cheap?
What is LP (Qualcomm)? What is LP (low pass)?
HP (Qualcomm) means: If FILTER (filter setting) is turned to 70HZ in HP, CROSSOVER (cutoff frequency), it means that the low frequency below 70HZ will be filtered out, the bass below 70HZ can not be output to the speaker.
LP (low pass) means: If FILTER (filter setting) is in LP, CROSSOVER (cutoff frequency) is twisted to 70HZ, it means that the frequency above 70HZ will be filtered out, and the frequency above 70HZ can not be output to the speaker. LP is usually applied to the subwoofer.
the fourth step:
The next step is to adjust the sound field. No matter what state the front sound field is, the rear sound field should be set in the HP state, and the CROSSOVER (cutoff frequency) is twisted to near 150HZ. At this time, the host volume is twisted, and the volume is normal. Next, the GAIN twisting the sound field after the amplifier is pushed is the CHANNEL-3/4. When the front seat is "feeling", the sound field is correct after listening to the sound. If you hear it, it means the sound is too loud.
the fifth step:
The adjustment of the bass is a key to the car's audio, and the adjustment will make the sound change dramatically. (Debug the bass is best to find a friend to help, one in the car to listen, one in the back).
After the first four steps of debugging, turn the subwoofer's power amplifier FILTER to the LP (low pass) position, CROSSOVER (cutoff frequency) to the lowest, then turn GAIN to half of the front sound field or 3/ 4 position, then turn the host volume to the normal large position, put a strong low-frequency disc, if the bass is a lot or the bass is too much, then the GAIN is too high, quickly turn the bass GAIN down, GAIN Normally, you will feel that there is no bass coming out. At this time, the helper behind the car will slowly twist the CROSSOVER (cutoff frequency).
The sense of hearing in the car is: the bass is coming out slowly, but the bass is ringing behind and the sound is boring. With the increase of CROSSOVER, the bass will gradually strengthen, harden, and the volume becomes larger, and the low frequency Will slowly move forward, CROSSOVER (cutoff frequency) when twisted to a certain point, you will suddenly feel the bass and the low frequency of the front sound field combined, the low frequency is no longer emitted from behind, but integrated with the front door speaker Together, from the front, this point is the connection frequency of the woofer and the front door (the GAIN of the bass must be adjusted together with the CROSSOVER (cutoff frequency), remember, this is very important, it is also the most difficult part of the car audio debugging), correct The bass should be: the feeling is sent out together with the front door horn. From the front door, the low-frequency sense is not much. At this point, the whole debugging will come to an end, you can calm down and listen to the music, and according to your own hobbies and tastes. Make fine adjustments until you are satisfied.