Where do I even start to tune my 6.5" Components??

[Bow94z]

I just installed my Eclipse 6.5" SC6500 Components (75rms) with SE6500 rear speakers (40rms). These are attached to a Eclipse EA4100 Amp (75x4) amp. I have a Alpine cda-9811 H/U.

Question is, Where do i even start tuning? At the amp or headunit? I understand i adjusted the input levels on the rears to half since they are rated at 40rms. But what do I do with the highpass and lowpass adjustments on the amp?

any opinions to get me pointed in the right direction would be great.

Thanks guys

[eharri3]

Start the high pass at 80 HZ. IF it isn't enough, play something you normally play at high volume and edge them lower a tiny bit at a time until you hear them stop playing cleanly on the bass notes. Some speakers have different midbass capabilities but 80 HZ is generally a good starting point, though it probably won't be low enough if there's no sub in your system.