Hey guys,
So I want to put a subwoofer in my car, but also use the subwoofer at parties. So for that I got this 2.1 channel preamp board with low pass filter:
CIRMECH 2.1 channel subwoofer preamp board Low Pass Filter Pre AMP Amplifier Board NE5532 low pass filter bass preamplifier|Amplifier| - AliExpress
And a TDA7498E based AMP in BTL mode:
CIRMECH TDA7498E high power digital power amplifier board 2.0 HIFI stereo 160W*2 support BTL220W DC12V 36V|Amplifier| - AliExpress
Tested this with a 4 ohm 10 inch sub in my apartment and everything seemed fine.
Then I go to the car and wire it up, and also use a 24V step up to power the preamp and amp.
I have a bluetooth adapter that I use, the schema is as follows:
bluetooth adapter -> 2.1 channel preamp -> car stereo aux (from full range output) & subwoofer amp (from sub output)
In the car stereo I got a whine/white noise even with no input connected to the preamp. When playing music, the sound was mostly low end, and the highs were lost. I figured it was a ground loop issue, so used this isolator:
XH M372 Stereo /Audio Isolator Vehicle Common Ground Suppression Interference Noise Isolation Module Transformer Coupler|Integrated Circuits| - AliExpress
Used this between the preamp and the car stereo. It seems to mostly work, there is still some noise in the car stereo, since I left that on high volume to use the preamp volume. But now, I do get more high end sound, but the low end is mostly gone, and only the subwoofer is doing work, which doesn't sound that good. Connecting the bluetooth adapter directly to the car stereo aux yields much better results.
The question is, what can I do to improve the sound quality of the car stereo after it has been wired to the preamp?Can the groun loop isolator filter the low end also?Should I use some sort of power supply isolation or something?
I also kept having problems with the XH2.54 sockets, since I don't have that exact connector, and instead had to DIY a 3.5mm jack with some other connector, and it isn't quite that stable in the XH2.54 sockets of the preamp, and since it's a DIY cable it isn't shielded, could this cause any issue?
Any help could be appreciated, thanks.
So I want to put a subwoofer in my car, but also use the subwoofer at parties. So for that I got this 2.1 channel preamp board with low pass filter:
CIRMECH 2.1 channel subwoofer preamp board Low Pass Filter Pre AMP Amplifier Board NE5532 low pass filter bass preamplifier|Amplifier| - AliExpress
And a TDA7498E based AMP in BTL mode:
CIRMECH TDA7498E high power digital power amplifier board 2.0 HIFI stereo 160W*2 support BTL220W DC12V 36V|Amplifier| - AliExpress
Tested this with a 4 ohm 10 inch sub in my apartment and everything seemed fine.
Then I go to the car and wire it up, and also use a 24V step up to power the preamp and amp.
I have a bluetooth adapter that I use, the schema is as follows:
bluetooth adapter -> 2.1 channel preamp -> car stereo aux (from full range output) & subwoofer amp (from sub output)
In the car stereo I got a whine/white noise even with no input connected to the preamp. When playing music, the sound was mostly low end, and the highs were lost. I figured it was a ground loop issue, so used this isolator:
XH M372 Stereo /Audio Isolator Vehicle Common Ground Suppression Interference Noise Isolation Module Transformer Coupler|Integrated Circuits| - AliExpress
Used this between the preamp and the car stereo. It seems to mostly work, there is still some noise in the car stereo, since I left that on high volume to use the preamp volume. But now, I do get more high end sound, but the low end is mostly gone, and only the subwoofer is doing work, which doesn't sound that good. Connecting the bluetooth adapter directly to the car stereo aux yields much better results.
The question is, what can I do to improve the sound quality of the car stereo after it has been wired to the preamp?Can the groun loop isolator filter the low end also?Should I use some sort of power supply isolation or something?
I also kept having problems with the XH2.54 sockets, since I don't have that exact connector, and instead had to DIY a 3.5mm jack with some other connector, and it isn't quite that stable in the XH2.54 sockets of the preamp, and since it's a DIY cable it isn't shielded, could this cause any issue?
Any help could be appreciated, thanks.