Vandersteen 2WQ Subs and ARC Power amp

Vandy subs are very subtle in performance.
When you plug them in, do you hear a 'Thump'. If so, good! They are working.

150K crossovers should be giving you noticeable bass, considering the amps 300K impedance, but perhaps your room needs a bit more 'punch'.

When in doubt PM John Rutan (Audioconnection).
Mr. V will also respond via phone iquiries. Just call Vandersteen and leave a message.
Either can give you the best information.
Bob

Another thought...
Which taps are you using with the ARC?
Bob

@stringreen 
Excellent point.

@mr_m ,
My subs have never been loud or boomy, in fact very subtle. I can only 'hear' them if I disconnect the speakers and play the subs separately.

@scottwsmith ,
Though mr_m gave you a caution, I would be hesitant with hooking up the Subs without the crossover.
Like I said, PM audioconnection, or leave a message with Mr. Vandersteen.
Bob

@scottwsmith , 
Good info.
When I separate the subs from the speakers, yes, I hear a very faint sound from the subs. So, I suspect they are working. Moving to a lower impedance should provide an increase in bass response- at least it does for me.
What sound you do hear is the from the frequencies of about 100 to 80 hertz- there isn't a lot of music being made there- even with bass heavy music. Though it does 'flesh out' the upper frequencies.
This one of the beauties of the Vandersteen sub and its' implementation.

Now, I recommended calling Mr. V.
Mind you, I bought my 2wq subs second hand. When I called and left a message, Mr. V. called back the next day to discuss the issue.
I, too, had a problem with almost non-existant bass with my subs. 
It turned out I was using the wrong impedance measurement.
What I was impressed with was that Mr. V. called back the next day to see if I had corrected the problem.
Now, that is service above and beyond!
I also suggested PM'ing John Rutan(audioconnection). He knows just about all the brands and can give you great information, as well.
And, don't think he is going to try to sell you something. He is way too classy for that nonsense.
Though I might be wrong, I think your amp might have a diiferent impedance than listed. 
Perhaps contact ARC to make sure. Also, ask them what they think would be proper connection for a Vandy sub.
HTH 
Bob

I probably should have pointed out Mr. V. can be a bit 'brusque'. Best to have all your information at hand, as well as well thought out questions.
But, hey, he is doing this for free. How many manufacturers actually answer the phone to answer questions?
@scottwsmith ,
Like I said plug in the subs, if they thump, they are working- Or, just play the subs without speakers and listen to the grumbling.

I really hope you solve your issues with the Vandy Subs. They are, in my opinion, one of the best buys out there. And, though they aren't the cheapest, they are built like tanks. I just sold a pair of 2w subs that must have been 30 years old, and they still functioned like new.
BTW, I also use a pair of HSU subs in my office with a pair of VLR's.
For the money, they are quite good, but not as good as the 2wq's in my main rig (soon to be replaced by a pair of Sub 3's). The HSU can give me big boomy bass, but the Vandy subs just disappear.
Bob

+2 on the spikes.
And, I'm glad you sorted things out.
BTW- Herbies also sells the gliders under the spikes.
B

@stringreen,
Were you using their spikes or the gliders under the Vandy spikes?
Bob