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2 Channel Subwoofer connection

Hello, I am seeking advice for a Subwoofer connection.  My system consist of a Rotel RCD 1570, Jolida JD 202 Integrated Tube Amplifier and a pair of Bowers & Wilkins 705. This set up is just for music listening.
I like how much detail I get from the music with these 705, the only problems is that my loft is an open space with high ceilings, therefore, the bass is not very strong. I thought I could add a Subwoofer. The issue is that my integrated amplifier doesn't provide a Subwoofer out. The only option will be to run speaker wire from the integrated into the Subwoofer's speaker level inputs, then connect the 705s to the subwoofer's out (As pictured in the diagram)

 https://cloudflare.crutchfieldonline.com/ImageBank/v20160824170200/ImageHandler/scale/978/978/core/l...

However, as I've never attempted this connection, I am concerned this could degrade the audio signal, would the sound quality be affected due all these extra wiring and having the signal go through the subwoofer and then to the 705 monitors?
I've looked into the Bowers & Wilkins ASW750  but this doesn't come with sub's level inputs. I am considering the ASW300 instead. Any advice will be much appreciated.
Thanks,

Joseph







mamifero
stringreen's avatar
stringreen
6,468 posts
 
High ceilings - large space =  weak sound  Surely you could try a sub, but make sure you can return it if it doesn't work out
yogiboy's avatar
yogiboy
5,691 posts
 
+1 avanti 1960
The JL Audio D110 is an oustanding sub. I use one with my Harbeth monitors and it works better than other subs that I have used.  Crutchfield has a return policy if it doesn't work out for you!
gdnrbob
4,447 posts
 
My recommendation would be Vandersteen 2w/q sub(s) with the proper crossover. It would free up the Jolida from reproducing the lower frequencies, and they integrate seemlessly.
B
bdp24's avatar
bdp24
9,814 posts
 
The Rythmik subs also provide speaker level connections to a power amp, just like the REL.
mamifero OP
9 posts
 
Thank you all for the useful advice. I will certainly look into the RELs and the other brands.

A couple of questions though. By keeping the main speakers connected to the amp and then running a second set of wires from the output taps to the sub, there won't be need to adjust the phase adjustment knob correct? 
As it sounds like they will be in sync for what I understand.
Finally, regarding bi-wiring. Currently my main speaker monitors are bi-wired to the amp, should I bi wire to the sub as well?
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