Originally Posted by 65 Electra Glide
I don't claim to know much about the X2, and I realize that you now the "go to" guy on this thread, so I humbly ask this with all due respect, but shouldn't the Fours be ran as large since they have internal crossovers already built in for the subs?
Also, wasn't there some discussion about 6 months or so ago about an upgraded X2?
Well, I don't consider myself the 'go to guy', just trying to help in something I've been doing as a hobby sine in the 4th grade (built my first speakers back then). I've had NHT's since the introduction of the original Super Zeros and have gone through multiple renditions. I've tried many other brands but always come back to NHT because I feel they give the best sound for the money (sure, I love the Revel Salon 2s, but they are way out of my pocket book). I've also set up many, many systems for family and friends - just about all the major brands of speakers, so am familiar with a lot - and still have come down to the same conclusion. The local NHT dealer a couple years ago, but when he was here, we did lot a A/B test comparisons with many speakers (yes, double blind, level matched tests). He also sold Revel, Genesis, and others.
Yes, there was a discussion on the X2. Also, many like to run the Fours large (I did that for some time). One thing to remember, and this is important, is that the best place for subwoofer placement (best, most even bass) is rarely the same as speaker placement for best imaging. Also, I've always used Audyssey based AVRs (since their introduction) and there is more power in correcting the subwoofer outputs (with the exception of XT32). If one wants to do a mod to the X2, absolutely go for it. It's not that hard - I'm just curious if there will actually be a difference in the sound, especially if using an AVR with correction. As mentioned above, I only used the X2 to bi-amp the bass of the Fours, the upper portion was not connected through the X2 (I used the LFE input/sub output to the sub). I let the AVR do the XO, which was directly connected to the upper portion of the Fours and found this to be the best way to extract the best sound from my system at the time.
I crossover my Fours at 60Hz. Keep in mind that most XO's built into AVR's are 12db/octave so there is still some energy in the 40Hz range. I like to XO all my speakers at least 20Hz above their rated -3db lower point. For the Fours, Audyssey always sets them as Full Range, I always re-set to 60Hz. They just sound better there and are much more dynamic in the Midbass when doing so. Subwoofers are dedicated to the bass region, so why not let them deal with that portion.
You can always try the Fours full range and then XO'd to a sub and use your preference. It's really about how it sounds to you. I've tried both configuration and many different XO points to get what I like best in our room. I do use and XT32 based AVR and also use the Audyssey Pro Kit to get everything dialed in as much as possible. The room is also acoustically treated with broadband traps (necessary since the room is fairly small).
Hope I did not ramble too much...