Quote:
Originally Posted by milesz
Yes, my car have both nav and DSP.
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Sorry, I missed that you said that in your original post. I totally overlooked it.
You will have a very difficult time using your DSP amp with an aftermarket radio. It is not impossible, but close. Here's why...
The DSP amp is computer controlled and depends on constant communication with the other components in the system over the car's I-Bus. Second, it is a does-it-all component. It accepts a full-volume, two-channel, balanced line-level input from the radio. Then, the DSP amp internally splits the two channels into fourteen individual channels and performs its high/low pass filtering, digital signal processing, and equalization on the channels before they flow to the fourteen independent output amplifiers. The volume, balance, and fader changes all occur internally in the DSP amp from commands that originate through the radio and navigation computer.
Here are your problems:
1) The DSP must sense the presence of the factory radio and nav computer to function. Therefore, you will have to have both of those installed somewhere so that they can communicate over the I-Bus and tell the amp that everything is OK. If either does not respond to the DSP amp, it will shut itself off.
2) You will not be able to adjust balance, fader, equalization, and DSP settings unless you also mount the original nav display somewhere else in the car.
3) There is no place to get a full-range signal to tap for your sub. You can tap into the DSP amp's original sub outputs, but they will be speaker-level outputs and probably not the quality nor the frequency (low-pass setting) you might prefer.
Due to the complexities above, I recommend pulling the DSP amp and speakers and replacing those as a package. The reason you also need to pull the speakers is that they are specifically matched to the DSP amp and its internal active crossover points. If you go with an aftermarket amp, you will need to install passive crossovers that match the factory speakers. It is just easier and sounds better to replace the speakers too.