More Power or use subwoofer to boost bass for music

OP you are new and don’t yet understand that the answer is 4 or more subs in a forest of box’s and wires placed quasi randomly about your room.

bass is a wide topic and for most music listeners spans from 30 HZ to the power range of 200-250 HZ. You might try to recall or ask the dealer where those speakers were placed in the demo from side and back wall. IF you do have to compromise with near surface ( back and or side wall ) coupling, then GIK or another brand of broad band absorber panel or three to address reflections will help w imaging. Finally also you might need to tweak your listening position a bit. Room modes effect. Bass , especially below 120 HZ... even a few feet can matter.

there are other ways to add great subwoofers if Indeed the problem lies below 100 HZ. One has built in EQ.

and yes, swarm aka multiple subs...works if the crossover frequency is low enough and you like the clutter.

Also IF flat frequency response in room was the only measure of bass quality why are there a plethora of bass guitars, standup bass, etc out there....?

this from a bass player of LiL reknown....

Someone should tell millercarbon to stop adding a link to every post he submits. One look at that room would send most running from the multiple sub approach.

To enhance bass you need to try to position the speakers closer to walls to amplify the lower bass, or add subwoofers. The answer is not adding multiple subs or adding bass absorption. The rational approach is to start with proper imaging using a method such as The Master Set. Imaging is key to proper sound from a stereo source. Once the imaging is perfect you can then add subwoofers for the lowest frequencies if you want more bass. It may help to use a computer and microphone to real time analyze the frequencies in your room. Then you will know how far down your speakers go. If you want 20 Hz or below you will need subwoofers. They are tricky but to get 20 Hz and below you have to move air. Lots of air. You will need 15” woofers. The idea of a “swarm” of subs is based on evening out the nodes. It’s an admirable goal but rarely practical. One well placed sub is good but not easy or perfect. Two well placed subs are better but beyond that you are spending a lot to get a little. Like horsepower. Look up Harman Kardon white paper on sub placement. Seminal work. Proper placement of stereo speakers doesn’t necessarily mean the proper placement for bass or subs. I recommend Hsu Research or SVS for affordable well made subs. That way You can afford two or three. Hsu sells pairs of identical subs. Best of luck and keep us posted. 

Hello cool,

     Millercarbon is correct, a 4-sub distributed bass array (DBA) will provide excellent bass performance throughout your entire room and integrate seamlessly with your main B&W speakers.
     If you’re only concerned with attaining excellent bass performance at a single designated listening seat, however, using 2 good quality subs will will work about just as well as a 4-sub DBA.  You may even be able to attain very good bass performance at a single listening seat with a single higher quality, and more expensive, sub that comes with a mic and has room correction software.   You would first optimally position the single sub in your room using the crawl method (you can google it) and then utilize the room correction function to fine tune the results.
     2 subs, even if they’re smaller and less expensive, will generally perform about twice as a single sub, even if it’s larger and more expensive. The benefits of using 2 subs are increased bass power and dynamics when the music calls for it, neither sub is operating near its limits and the bass will be better integrated with your main speakers.     Whatever sub or subs you decide to use, it’s very important that each sub has separate controls for Volume, crossover frequency and continuously variable phase.  These controls are critically important for adjusting them optimally to your room and system.  It’s also beneficial for the subs to have the choice of inputs, rca line level and high level speaker wire.       You’ll also notice an improved soundstage and improved midrange and treble performance of your main speakers utilizing 2 subs.
     I suggest trying a pair of SVS SB-1000 subs or similar Hsu subs for about $1,000/pair.

Good luck,
    Tim