Price Paid:  $50.00 from Conn's Clearance Cen

Summary:
Before writing this review, I read the other 21 and the one thing everyone mainly complained about was that it loses control at high volumes. What I notice about most people is that they believe that they have to have monstrous bass for something to sound good and an 8 inch sub that lists for $149 is not going to produce bass like you get in a Honda with 2 15 inch subs. Audiophiles like myself strive for a balanced sound meaning the bass, treble, and mids are all heard clearly and evenly without bass drowning out the rest of the sound. This sub is absolutely excellent for it's size and price and you could not find a better powered subwoofer for the price. The bass is as deep throated as I've heard from a driver at this this size and even double the list price and the active servo amp design keeps the bass in control at any volume level without drowning out the rest of the sound. Any speaker turned up to past it's limits will sound like "farting noises" because the excersion of the driver is beyond it's capabilities and the voice coil former is hitting the magnet structure. This is not an excessively loud sub so if you need excessive bass or have an extra large listening room, buy two of them. Two of them will probably out do most subs under $300 anyway. But I live in an apartment so one is plenty for me.

Strengths:
Excellent value. Room shaking bass. Accurate sound without excessive boom.

Weaknesses:
Cannot play extra "low" but 99% of 8 inch subs cannot play below 30 Hz anyway.

Similar Products Used:
M & K, Cerwin Vega, Paradigm

Price Paid:  $60.00 from e-bay

Summary:
I've got this sub in the bedroom. Came in the Yamaha YHT-23 package. Perfect for the small to medium room. Have sub under the bed ( great musical massage ). Works for my needs in the bedroom. I have 15" woofers in my front main speakers along with two 15" subs in my main HT system. As you can imagine this system can shake the house, literally. But as I said earlier this fills my needs in the bedroom. Great little subwoofer.

Strengths:
Great bass

Weaknesses:
None

Similar Products Used:
Audio Source SW-15

Price Paid:  $140.00 from Best Buy

Summary:
Ausome bass. Nothing could beat it! Peace to the trees!

Strengths:
Big Bass

Weaknesses:
cracks in the walls

Similar Products Used:
none

Price Paid:  $140.00 from A&B sound

Summary:
At low to mid levels, this sub has good control and good output. When pushed hard, the bass sounds like a little kid making fart noises with his cheeks. I currently have it connected to my mini system (sony cmt-ex1), and it works as an excellent matching pair. For smaller home theatre, its fine. Larger ones will require either two units or a larger single sub. But for the size, and the price it is a very competent unit

Strengths:
Good output for the size, easy access to controls, and good price.

Weaknesses:
At high volume, this sub looses control like an 80 year old after eating two pounds of prunes. It also requires lots of tweaking to get it just right.

Similar Products Used:
smaller polk and velodyne subs.

Price Paid:  $195.00 from A&B Sound

Summary:
Good sub for a first home entertainment system

Strengths:
Good bass for the money in small room

Weaknesses:
auto on switch