Hi, my question is if can I wire the audio signal going to the stock speaker of the car into an amplifier for a subwoofer? I'm not totally sure of that because it would mean send an already amplified signal into an amplifier, although i red of someone that done it.
Thanks for replies.
Thanks for replies.
You need a line output converter.
https://www.bcae1.com/loc.htm
http://catalog.dev.pac-audio.com/catalog/line-output-converters-loc/#
The SNI-35 is commonly used.
https://www.bcae1.com/loc.htm
http://catalog.dev.pac-audio.com/catalog/line-output-converters-loc/#
The SNI-35 is commonly used.
A typical auto stereo uses a bridged speaker output so the speaker negative cannot be connected to the sub input ground because it is an inverted output. However, you can probably simply use the positive output only, provided the sub amp has a DC blocking capacitor, because the bridged outputs will carry half the battery DC voltage. You may need to connect the sub input ground to the stereo ground, ie not the negative outputs. Many auto stereos have ~RCA outputs for an external amplifier, which will be grounded normally. These "output converters" are just simple RC networks which you can build for cheap with a few penny parts.
Good quality line output converters have transformers to convert the balanced output of a head unit to a unbalanced signal.
The problem with using only one of the balanced output signals is that they're biased to 1/2 of B+ and they transition from 0v to 1/2B+ and back to ground when the head unit is powered up and sometimes when switching between modes. This can cause a loud pop. I'm not saying that it won't work but if there is a loud pop, this may be the reason.
The problem with using only one of the balanced output signals is that they're biased to 1/2 of B+ and they transition from 0v to 1/2B+ and back to ground when the head unit is powered up and sometimes when switching between modes. This can cause a loud pop. I'm not saying that it won't work but if there is a loud pop, this may be the reason.