I have an old Nelson Pass Threshold active xover--it is much better than the xover in previous subs--I now use this with a pair of JLaudio 113--I think their thoughts were that most HT systems would use the dig processor for xover and if you were going to use it in a 2ch system an outboard xover would be superior -----you could always try an NHT or Bryston xover if you didn't want to go to the Pass labs
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Try looking in to a pair of Vandersteen 2WQ Subs with one of the most simple transparent High pass systems available The Vandersteen X5 in either RCA or XLR This unit offers a small battery that keeps the Caps and cables formed at all times ultra hi quality parts inside.It is truly
one of the best I have run and and available at a fair cost.
The NHT X2 filter will work well with the JL Audio subs; it supports balanced connections.
Shameless plug... My M&K base management controller is for sale here at audiogon; supports balanced connections and provides level trim on each channel, which the X2 does not.
It turns out that few subs have proper high pass filters built into them. For those that do (like many Velodyne units) the filter is 1st order and probably passive.
The SVS PB13-Ultra has an active 2nd order high pass filter built into it. It supports both balanced and unbalanced connections. Read the review in the latest Stereophile and check out the independent measurements on the web -- it out performs the F113 in the deep bass.
A negative of having bass management in the sub is that you can not apply room correction on the bass channel. With an external filter you can add a Velodyne SMS-1 on the bass channel and keep the main channels unaffected.
Bryston also makes an excellent sub crossover, but it is about $2500 I believe. I have read on this forum that JL Audio was suggesting a Rane crossover. That's another option and it has a unique timing delay feature.