Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Do you need a subwoofer for these speakers? Or do they sound ok without it?
Document: I purchase 2 sets for front and rear surround, paired with a Polk CS20 for center. They sound great and very clear. These in wall speakers of course is not an equivalent replacement for full speaker towers, however with my space limitation and a cleaner install I am extremely happy with them, an addition of a subwoofer will complement these speakers. Even without center or a subwoofer these speakers will be plenty loud in a 15x15 room. I am using a Denon AVR-2312CI to power these speakers.
These speakers are my best sellers. I use them in more home theater installs than anything else. They have impressive 8&#34; woofers that make up for the lack of bass that most inwall speakers have. Yes, you still need a subwoofer for these and the PSW505 is the best for the price to round out a kickin' system. At this price point you're not looking for ultra high end, you get what you pay for and with these you get a little more.
(unless you cut a really sloppy hole out of your wall. )I have 10 foot ceilings, and the wall I mounted them in is approximately 15 feet wide. I spaced the speakers about 10 feet apart, and put them about six feet up from the ground. There is no insulation inside of this wall, just studs and drywall on both sides - and it sounds great. Bass response is so incredible I don't really need a subwoofer. (I use one anyway.
I noticed the RC85i are almost same price so if you have a room for bigger surrounds, that's another option but you don't really need the extra base for side surrounds, especially with a decent subwoofer.All in all I'm really happy with my set up. I'm using a Denon AVR791 to push all these speakers and it does so with out breaking a sweat. Even when I crank it up for LOUD music everything still sounds find and nothing catches on fire!I'm becoming a big fan of Polk speakers.
Smooth sound without a lot of rattle or feedback. So far they have been the best in wall speakers I have owned.
A little bassy compared to my Polk TSi100 front speakers, but that's ok. Over time you get it all balanced out. Definately good enough for a high end set of surround sound speakers. Can't beat the quality for the price. I'd even use them as fronts if I were looking to start over. Hmmm, maybe I WILL do that. :-)
Be liberal with it because more wire is better than less wire.These speakers have tweeters that can be angled. I recommend you angle them to your listening position.Sound:Once I turned on the receiver I said "oh... I guess it sounds ok". Then I started to justify it... "I only paid $500 for it so I get what I pay for...". DON'T GO DOWN THAT STREET!
I bought these for discrete in wall speakers to go with my living room setup. When I took them out of the box and tried them just plugged in, they were just ok.  Once I got them into the wall with some insulation packed behind them, the sound was night and day difference. They sound excellent, and the bass they provide was astounding for such a small speaker. Would definitely recommend at the price that dropped 30 bux after I bought them...grrrrr.
These are VERY good speakers. I installed a set in my garage ceiling and one more set as front main for my 7.1 system. I am very pleased with the output performance. Very clean and clear sound (high, mids and BASS). Initially installed them without any insulation on the back but the punch was pretty strong to a point that the other side room was disturbed.
Not sure if I am going to use these as front L and R  or left and right of 7.1 surround.I may put some polk 3 ways in front. these seem to sound ok!
Answer: That really depends on your taste.  The speakers give off a great mid rage, descent highs... Not much for lows though.  I have a sub and the system sounds awesome.