Subwoofer for classical music listener

After much difficulty I finally got to set up my used 2Wq sub only to find that the left channel doesn't work. I followed the directions in the manual exactly in setting up the wx-2 variable crossover, matching it to my amp. I checked all the connections several times for tightness and correctness.
 I even reversed the connectors to to the amp and the left channel still was out!
Both channels work fine without the wx-2 and sub attached.
Prior to getting the sub Richard Vandersteen himself wrote and warned me not to hook it up without the crossover as it would cause damage.  A very generous member of this forum lent me the wx-2 as it wasn't included by the seller.
After many hours of experimentation I still have gotten nowhere.
The seller says it worked fine for him with a fixed crossover.  He is sympathetic and is willing to give me a full refund.  I hate to return it because the one channel that works sounds great. I can only imagine how stereo would sound.
Does anyone have any ideas?

(((Sorry if I am misunderstanding one of your posts, but if you are using the 2wq without a crossover in between the pre and power amp, it poses no danger to anything of course,)))
Montaldo
I know you mean well but read the manual please
as you are very wrong here and giving bead advice.
You must always use either the assessment box or the proper high pass
 its that simple.

 rvpiano call me with a pen and pad at audio connection Verona NJ tomorrow and I will run you through proper set up.
 you most likely have the dip switches set incorrect.
 Best JohnnyR

Sorry if I misled ... I know you are supposed to use the crossover to get any kind of good results. But running the full range signal from the amp to the sub doesn't endanger the sub, does it? It just puts a bunch of higher frequency information to the sub, most of which rolls off.

I was absolutely not suggesting no crossover should be used ... I just saw a post that he might try it or was trying it. No danger, but probably bad sound, correct?

I just realized I am completely wrong. Apologies all. JohnnyR is right of course. No crossover sends far more bass information than the sub is supposed to see and the inverse curve in the sub would produce far too much low frequency info and damage the sub. My bad.

Brain freeze last night.
Stu

Rvpiano 6-1-2017
After much difficulty I finally got to set up my used 2Wq sub only to find that the left channel doesn’t work. I followed the directions in the manual exactly in setting up the wx-2 variable crossover, matching it to my amp. I checked all the connections several times for tightness and correctness.
I even reversed the connectors to to the amp and the left channel still was out!

You indicated earlier that you are using modified NuForce amplifiers. Like some other class D amps some or many of the NuForce models have their + and - output terminals offset from ground by 24 volts, or some other comparably high voltage. Depending on the internal grounding configuration and other characteristics of the design of the particular sub, connecting a powered sub to that kind of amplifier output can cause either improper operation, or no signal to be heard, or damage to the amp or the sub.

For example, from this manual for one of the NuForce amps:

WARNING: Do not connect NuForce speaker-level outputs to the line-level inputs of active devices such as active subwoofers or semi-active speakers with powered woofers. If you use semi-active speakers where the woofer is powered, or a subwoofer that accepts speaker-level signal from the NuForce, or sums the left and right input signals from the speaker outputs of two NuForce mono amplifiers, please consult NuForce or your dealer before proceeding....

Floating Speaker Output – The speaker output terminals are floating, with a 24VDC offset (DC across the speaker terminals is still 0V). Please consult NuForce Support (support@nuforce.com) if your setup requires any of the following configurations:

1. Multiple amplifiers to drive a single speaker driver (Never do this!).

2. Subwoofer that accepts and sums left and right input signals from two NuForce amplifiers’ speaker terminals.

3. Grounding other audio signal grounds to any of the speaker terminals on the NuForce amplifier.

4.Using two amplifiers to drive a bi-amp, series-crossover speaker (uncommon setup).

The fact that you "even reversed the connectors to the amp and the left channel still was out" would seem to confirm that the problem is related to the amp/sub/speaker interface, not to the crossover. But the fact that "both channels work fine without the wx-2 and sub attached" presumably means that the amp has not been damaged, at least not yet.

So depending on your specific NuForce model it might not be possible to use it with any powered sub that only provides speaker-level inputs.

Good luck. Regards,
-- Al