<font color='#000000'>is that enough for bass?
> are you happy with the bass it makes now!
they are 15s,and if they are decent 15s you will get good bass.Try listening to a friends system to see if your missing anything.If they do 25hz well,then you dont need a sub.
I dont think its any use having rear speakers that do bass(unless you have money to burn) because low bass is non directional.
often rear speakers similar to your mains is waht people do.
eg 100hz-20khz is enough - am i right?(diy sub guy not multichannel )
its neat to have lots of subs tho lol
center speakers are just midrange (i think) as its for the vocals
eg 100hz-10k- so it means midrange
(im not a 5.1phile)
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