If it were the wire gauge, re-coding wouldn't fix it, would it? You would need a bigger wire.

If the nav is seeing the DSP and letting you set it, it should be fine...the only thing is that the HU has to be in DSP mode and have a fixed line out to the amp, and the amp has to change volume internally.

To see if the HU is fixed in level, you really need to use a voltmeter on the preamp leads into the amp and turn the volume up and down and see if the voltage rises and falls.

But it is probably fine - if the HU "sees" the DSP amp on the bus, then it probably switched the output fine.

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musicar northwest, portland oregon

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