I'm having an issue with my Hk 635 avr. It just not crossing over the subs like I want it to. It seems to be holding a flat responce all the way up to 120hz before rolling off @12dbs/octive. I have the sub crossover point on the reciever set to 60hz. And I still get a spike between 90 and 110hz. I get the same responce no matter what crossover point I use. So something is going on with the reciever.
I have 2 subs hooked to a vintage Hafler amp, via subwoofer preout. Im thinking of building (if possible) a passive sub crossover. Something that rolls off between 12 and 24 dbs/octive @ around 70-80hz with no highpass filter. Any suggestions?