Never go for pxah100...its basically making any lower end alpine headunit to become 9887..and that's it.

For the money, you can get many option like the dsp u mention. But bear in mind these dsp are using headunit mosfet. The output is limited too... but it will sound much much better because of the tuning function.

My comment on the s60 is the super lack of mid bass, thus you found the hi is too much. Seems like power for the mid and hi doesn't match with the crossover design for me...

I has done some 80prs upgrade with same price range external dsp...so you should be able to figure now how good a built in dsp is...

that's the reason i done some 80prs upgrade to external dsp... It just cannot catch up with the modern world