Subwoofer Recommendations


I am looking for a single subwoofer that will compliment my JBL L100 Classic speakers.  This is my office system and I only want 1 subwoofer (no swarm) to add a little oomph below 50hz.  I will be using it with my McIntosh MA6600 on the second set of variable line outs.  The sub has to accept line in, have a phase control, level control  and adjustable crossover so I can cross it over under 80hz or so.  I will be still running my JBL speakers full range.  Price is up to $1500.00 new or used although keeping it at around a grand would be great.  This is the only way I will hook up the sub and I would like something that does go deep.  I know there are probably hundreds of subwoofer threads but I have never looked at them.  This is just something I came up with today so any help would be appreciated.
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How did you decide between the sealed vs ported sub on the SB2000?
The main reason was you were only looking for one sub so thought space may be a consideration and two SBs are a lot smaller than two PBs while still getting you under 20Hz (-3dB).  The other is I tend to prefer using a sealed sub for music, but I understand properly-designed ported subs can work as well.  Last, I own an SB2000 I use for HT and it alone can shake my living room when required so two PB2000s seems almost like overkill for music purposes.  So that’s where I was coming from with my recommendation. 

I have two SVS SB 2000’s, as I listen mostly to music.  The ported SP 2000’s provide more boom and were noted to be better in a home theater for movies. 
@stereo5 , you will a 12" sub to produce anything useful below 50 Hz. Just a caution, bass travels...far. When my system is on playing something with a lot of information below 30 Hz things on the opposite side of the house rattle and buzz like crazy. This may cause trouble in an office environment.
I recommend one of the REL subs. They will blend in very well with your JBL L100 Classic speakers.