Bass management--high/low pass filtering

@gdaddy1 if you know anything about logarithmic scales, at -10 dB it has dropped to a meaningless sound level, so has essentially -6 dB.

The F328Be:s taper out at 35 Hz at -3 dB, which is still a meaningful sound pressure. One of my subs, the KEF KC92, goes down to 11 Hz at -3 dB, a huge difference, and I low-pass filter it at 100 Hz.

In addition, the tube power amps are not that great in controlling the lowest bass as they have a relatively low damping factor. I trust the sub's 2x 500-watt solid-state amps to do a better job controlling the bass drivers.

Besides, I picked 80 Hz, but anyone can choose their preferred high-pass frequency. It is, after all (still, but unfortunately in peril) a free country.

@cooper52 I actually did it myself. I built two high pass filters, one for each channel as I’m running my Audio Research Ref 5SE to two separate ARC Ref 250SE mono blocks. The monoblocks feed a pair of Revel Performa F328Be speakers.

I got some help designing the second order high pass filters from GR Research (they were happy to help me without charging me a dime, which was very appreciated) and I will be happy to share the circuit diagram with you. What made it a little bit more complicated for me was that I’m using balanced connections between the line stage and the monoblocks, but it’s only a few more components.

This does indeed relieve the main speakers from, in my case, anything below 80 Hz, and of course my two subwoofers have low pass filters and with REW I can make sure everything melds really well.

Comments here saying that "main speakers should always be run full range," in my humble opinion, don’t know what they’re talking about. I believe there’s absolutely no basis for that statement, as then in its extension you would say that you don’t believe in crossover filters, as high passing the upper part of the frequency range to the main speakers and let the subwoofers take care of the lowest frequency duty is exactly the same thing as what a crossover filter does inside the main speakers.

@gdaddy1 per my comment above, in my opinion your comment is simply not true

@gdaddy1 if you don’t like my approach, which I have explained in quite the length, why don’t you quietly move along. I was merely responding to the OP as I believe I have some relevant experience relative to his question. 

@cooper52 the crossovers I made, with some help from GR Research regarding the schematics, caps and resistor values, cost me about $250 in total, using high quality components and about two hours of my time. It’s also quite a fun DIY project, and far from a $3,500 trial investment. Let me know if you are interested in more details.