I need to splice into a Low Pass

[dusty430]

Hello,

I just installed a rockford amp and sub. When it's on, I only get all pass or high pass on my amp and no low pass. Where is the best place to tap into the mach 460 for a low frequency?

 

[Foreigner]

If when you have it on full pass and no low frequency gets through then technically you still have high pass working. If this is the case then tapping into a low pass wire (near impossible) won't help. Two potential problems! (that are likely, it may be neither of these)
1) the amp is broken - do you have warranty??
2) the deck is broken and is not transfering these frequencies to the amp. - my money is on this one!!

Like I said, it may not be either of these. Check them out though cause they are relatively easy to check.

 

[iskwezm]

sounds like it was tapped into the outputs of the amp which are cancelling the RF crossover.Try getting the inputs before the Mach amps.