humming from sub

i have an older lanzar 100-s amp that doesnt have a high low filter, so i have an external crossover. and a 10" sub.  the problem is, is i get humming coming from the sub and a some high frequencies, not real high, but words that shouldnt be there. i have the rca's from the head unit connected to the crossover's high input because the low input has speaker terminals for left and right pos and neg, then low pass selected and bass boost off, then rca outs to the amp. and then connected to the sub. what could be causing these sounds out of the sub? is it because the rca's are connected to the high input of the crossover? this is the only thing i can think of right now. if that is what it is, how do i hook up to the low input with the speaker terminals with the sub out rca's from my head unit. thanks

Are you hearing high frequency noises or actual high frequency program material (music) through the sub?  What is the make/model of the crossover?  Usually "high" inputs are for speaker level signals, but it could also just be the way it is labeled.Support the12volt.com

its a pyramid gold series cr-66 subwoofer electronic crossover. there are actual words from the music coming through. "high level" could just be better signal u think? since they are rca's, not just speaker terminals. thanks

Sounds like you have ground loop problem.  The "expensive" lanzar amp has floating ground (I believe)  where the pyramid is common ground.  Good co have built in switches to change grounds.  Try grounding shield of rca.

ok, i have read about grounding shield of rca before, but dont remember where, would one of you clear that up for me please? or know of a place to find it. i dont know of a switch that can change grounds either. there is a ground wire that comes out of the amp (thats how old it is, has an actual wire coming out of amp, not just a connector).  could the ground be bad all the way up at the deck?  thanks guys

or, and this is the MOST likely answer, the pyramid XO is a POS, and has a VERY shallow 6dB XO slope... this will allow MUCH of the higher frequency stuff through. dump that thing, and get a good piece of gear. the ground issue is a possibility, but that would not cause voices to be heard in the sub, even if it COULD cause noise. what he is describing is a shallow XO slope.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

your definition of " lot" and mine are different, i guarantee it. how much is "a lot"?It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."