Hi everybody! I'm also contemplating high passing (some of) my speakers. Regarding the capacitor advice of @erik_squires: would it be possible to add it directly before the speakers? Of course, a different value would be needed. Sorry if this is stupid, I have no background in electronics. My reasoning is like this:
1. If I'm going for the preamp-->capacitor-->power amp route with my integrated amplifier (with pre-outs and power-ins) then I would also need another interconnect cable as I cannot simply insert the capacitors in the RCA or XLR connectors in the back of my amp. The cable would need to be butchered. Plenty of extra contacts and soldering in the signal path as well as the particular voicing and the extra expense of the additional interconnect turns this into something less simple and elegant than I'd like. Not to mention that I'd have to use both the unbalanced and the balanced pre outs in this case at the same time (pre to power and also pre to subwoofer) and I don't know if this is totally without sonic consequences.
2. For connecting the speaker cables I prefer the bare wire option anyway, after trying WBT bananas and spades that is. I'd simply have to solder one speaker wire to one leg of the capacitor, while the other leg would go to the biding post (maybe at the amp end of the speaker cable in order to avoid too much vibration induced by the speaker?)
3. Or maybe this could be done inside the speaker, between the crossover and the woofer itself?
Of course, in this case only the woofer would benefit from having to deal with less deep bass while the power amplifier would not be spared of the task...