1 1 bmw520 is it necessary to add a power amplifier?

Compared with other cars of the same class, the BMW 5 Series low-end stereo is really not on the same level, which is very bad. Share and discuss my views with friends who like tossing here.

A year ago, after "careful consideration", I finally started with 520li. The 520 and 523 stereos are "stereo systems", which are the simplest stereo systems in BMW.

Let me talk about my upgrade process first. The first step is to install the original BMW treble, and the sound is much clearer. The second step is to change a pair of front door speakers, Harman Kardon's, which has little effect. Step three, this step, has given me enough trouble. Let's take our time. First, I bought a pair of 8-inch woofers disassembled by BMW X6 on X Bao, and replaced the subwoofer under the seat. As a result, because the impedance was too high (8 ohms), I couldn't push it and the sound was low, so I changed to a pair of Harman Kardon 8 inches with 2 ohms impedance, which felt good bass, low dive and flexibility. However, when the car starts, there is a sonic boom when the volume is turned up. The analysis is caused by the low impedance of the speaker and the small filter capacitance of the power amplifier. Because the car is still under warranty, I dare not disassemble the audio host easily. I connected an inductance coil in series on the woofer, and the situation has improved, which is acceptable at low volume. After using my friend's Audi A6 for a few days, I feel that people's high notes are very comfortable. I really can't stand driving a BMW and listening to the broken stereo all day, so I found a so-called poisonous tweeter on X Bao and waited for a long time for logistics (10 days! ), I couldn't wait to put it on when I received it. The result is extremely disappointing. What is the most poisonous nonsense? I spent hundreds of dollars and sweated all over. Only businessmen are the most poisonous! In order to solve the problem of sonic boom, I bought a set of X5 speakers, a set of treble, a set of alto and a set of bass. The bass is Philips 4 Euro 8 inches. Remove Harman from the front seat and put him on Philips. Just change the last two and add high notes. The elimination of sonic boom improves the clarity of the back row, but the bass is stiff and inelastic. Harman kardon is really not blowing. Step 4, add a power amplifier. In order not to affect the warranty as much as possible, first remove the original car CD and check it. It's really difficult to disassemble the CD player for the first time. It took a long time to get it out. Results After careful study, it was found that the additional power amplifier was difficult to handle, the circuit was changed too much, and the BMW assembly was complicated and precise. If it is not good, the related parts will be damaged. When the CD player shell is disassembled, it is found that its power amplifier is a 27-pin integrated block, and the related information of this CD player circuit can not be found on the Internet. Because the manifold block is clamped, the specific model can't be seen. According to the "40W" output and a lot of data provided on the Internet, it should be possible to replace it with TDA7850A with high current output of 10A to achieve better performance. So I bought a TDA7850A at a high price on X Bao, and finally removed the original power amplifier block with great efforts. It was TDA7563B, hehe 7563, yes, 40W! Full of joy, put on TDA7850A, get on the bus and try it, silent! After careful study, it is found that TDA7563B and TDA7850A are both 4-channel 50W FET outputs (output current varies with 2A), not 40W as everyone said on the Internet! TDA7563B is not TDA7563, which is 40 watts. Although the external pins are the same, the internal control circuits are different and cannot be replaced! Because the pins removed from the integrated block have been damaged and cannot be replaced, the circuit on the circuit board has to be replaced. After several tossing, it is proved that this integrated block is bad! My darling! Now we can only buy new ones to exchange. I can't find a higher level than TDA7563B, so I have to buy another TDA7563B to replace it. At this point, I turned around and went back to my original place.

Buying a low-priced BMW 5 Series focuses on cost performance. Therefore, there is no need to spend too much money to modify the sound, try to spend less money and maximize the improvement. There are many different kinds of modified stereos on the market. Spending money is not necessarily good, and it is not worthwhile to make a mess of the car. I think many people on the forum recommend something like Munster. I wonder if it is hype. I don't evaluate its quality. I think if you must modify it, you'd better choose some big-name speakers. Stereo doesn't have to have strong bass and harsh treble. The original BMW horn and Alto horn are actually good. Don't underestimate that little magnet, it's a rubidium magnet. Comparing Harman Kardon and Philips repeatedly, there is little difference in sound quality. The worst thing in the original factory is the 6.5-inch woofer under the seat, which must be replaced. It is recommended to replace the 8-inch Harman Kardon for BMW's high-end vehicles. If you don't add a power amplifier, it will cost 4 euros. The original car didn't have a tweeter, so this must be added. You can choose BMW original treble, and it is recommended to choose high-end Harman Kardon. Replacing the woofer with the tweeter will greatly improve the sound of the whole vehicle, which can basically meet the requirements of friends who are not demanding. If you want to get more changes, you can only modify the power amplifier at this time. The original car is an Alpine cd host with a power amplifier. The power of 50 watts for 4 channels is a little small. It is very difficult to push this pile of speakers well. This machine works well. In addition to playing radio and music, there are driving-related functions, so it can't be disassembled. It can only be modified in its power amplifier. After my careful and bold attempt, it is proved that it is impossible to improve the power simply by replacing the power amplifier integrated block at present. I think the best way is to cut off the power supply of the power amplifier block tda7563b, take out four audio signals, and receive them at the output of tda7563b after being amplified by a higher power amplifier. The external power amplifier is about 4 * 100W, which is directly fixed under the cd player and integrated with the cd host. Pay attention to whether the output impedance of the power amplifier matches. BMW's high school notes are all 4 Euros. In this way, the power problem of the original car cd amplifier can be solved almost perfectly without destroying the original car line. Why do you say "almost perfect"? Because there is a new problem that has not been solved, that is, the original car is silenced by bus control tda7563b, and how to mute it with power amplifier. Also, when the car horn sounds an alarm, the volume of the music being played will decrease. I wonder if it will be affected after using the external power amplifier. Welcome friends who like tossing to discuss together.

Changda Auto Parts Changming just bought four trebles and two nets online, and I don't know if it can be improved obviously.

20 17-08-3 1

Hello, Mr. Zheng Zheng, I humbly ask you something. The BMW 520li bought in 20 15 1 month modified the big screen in the 4s shop. Why use the extra usb plug in the suitcase to play music? It would be perfect to play music with the usb plug on the car (where there is a cigarette lighter in the suitcase).

20 15-05- 14

1

Tyj 1 188 How are the two woofers connected in the BMW 5 Series 4-channel amplifier? When I adjust the front and rear stereo, the sound of the woofer remains the same. Is it parallel to the alto?

20 14- 10- 10

Taizhou Cheyou 457 162 1 This is the truth.

20 14-06-08

Most Satelac forums are procrastinating, but you are reliable. By the way, I think the ultra-thin bass of Meizhen is good. The impedance is 4 ohms. Can the original small screen host drive? Can you not add a power amplifier? I really can't bear to be moved.

20 14-05-20

Zj042882 Munster is a fake foreign devil.

20 13-07-06

1

Liu Xiao gps Well, the power amplifier is very important. I like the sound quality of hivi.

20 13-06-04

Zhouji 20 13 stereo is a system, and its performance is determined by many parts. I think the poor sound quality of BMW is mostly attributed to the power amplifier. My speaker is made by hivi. Used to push with marantz 4400ose. I feel terrible. The treble is seriously lacking, and the bass is weak, and the whole sound stage is dry. Then I tried to get into a Harman Kardon AR270 amplifier, which immediately changed my view of hivi. Later, I used marantz to push the light cavalry V23SE, and the effect was much better than the original built-in LM 1875. The big horse-drawn car really works, so BMW 5 Series wants to improve the sound level, not only to improve the speakers, but also to improve the quality of the power amplifier.