I am new to configuring hardware. I recently purchased an old JVC AX-R97 165W amp, a pair of Technics SB-TS100 speakers, and a pair of NHT SWS2i subwoofers. The Technics sound great on their own. When I plugged in the subwoofers, it all sounded fine, except for the fact that the subs go up to 500Hz. Because this is my first setup, I figured I would order off-the-shelf two 80Hz low-pass filters (the Lucasfilm THX Technics attenuate well naturally around this point). With the filters on the subs, I encounter two problems. The Technics sound much less bright, with a lot of mids, even when they are playing at my regular listening volume. Also, the subs are now quite overpowering, a minor issue. I am hoping that if I put a pair of 80Hz high-pass filters on the Technics, this will clear up my main issue. Before I spend money, is this true? Furthermore, if I've matched the 8 Ohm subs with 8 Ohm filters, should I match these 4 Ohm speakers with 4 Ohm crossovers or stick to the 8 Ohm? I know this is strange to use speakers of such different impedance, but I have them. Thanks for helping.