Home > Consumer Reviews > Klipsch Synergy SUB-12 Subwoofer Speaker (Single, Black)

I recently replaced a Polk Audio PSW-12 with the Synergy. This is an amazing upgrade. It mixes well with the Polk RTi-8 Fronts, and CSi-3 Center, R15 surround and Infinity Primus 250 Back Surround. All of these speakers are powered by an Onkyo 803.

The previous sub had good bass response, but was very directional. What I mean by that is I could hear the bass coming from the sub. It did not fill the room. The Synergy fills the room, and actually makes the bass sound like it is coming from the individual speakers. If you increase the gain, it will shake the house.

Installation was very simple. I used the LFE connection, and plugged it in to power. It also has an automatic power save mode, and a light on the front to let you know what mode it is in. Over all, a great value!

I bought this sub about 3 years ago from best buy.It Has peformed wonderfully with no problems. Clean bass with very little distortion. I am still glad i bought this sub. Would deffintly buy it again.

This is a tremdous improvement over bass speakers I've owned in the past. Deeper, fuller and not boomy at all. You actually feel the sound much like listening to a large pipe organ. It's the best I've ever owned.

This sub is really loud and deep bass. You can set the crossover up to 120 and even if you set the gain (volume) to half it would fill up the room. Mine is 1000 sq ft with 12 ft ceiling.

The only issue I have is the materials used was cheap mdf and its HUGE but not too heavy. The amp broke after 1 month, good thing I bought it from an authorized dealer close to mine and got replaced.

Beware of those internet authorized dealer, apparently warranty for Klipsch does not include home service. You basically have to ship it to them at your own expense with the original box (oouch !!!).

KLIPSCH SYNERGY Sub-12: Unlike most people who purchase a Sub-woofer to add to their Home Theater (HT) system, I needed a Sub for another reason. I had to replace my 25 yr old Integrated Amplifier with a modern A/V Receiver. One thing I didn't forget was to pick a Receiver with Phono input for my turntable (26 yrs old). But, I didn't realize until a few days later, after figuring out how everything else worked on the new component, that it did not have a "loudness" button on it either. I didn't think about it at first because mine was always turned on. I only have one pair of speakers connected to it; a couple of Klipsch Heresy's that I have had forever. These small box speakers do not have much low-end response, maybe 50-60 Hz at most.

Well, the old "loudness" compensation would normally boost the low-end enough to be adequate for my listening purposes, but with this modern A/V Receiver, the speakers sounded very flat and turning the Bass up to its highest point didn't change things much. It was becoming obvious to me that the design of these 5.1 & 7.1 Surround Systems was that the designers really expect you to hook up a sub for "full-range sound" and that an adequate amount of bass response was missing from the standard left and right front channels even when I picked "Large" speakers in the set-up. So, off I went to the local Best Buy to listen to some of the models I found here on Amazon when I searched for Sub-woofer: Polk Audio, Klipsch, etc. My budget was $200 - $300 and I hoped the little Polk PSW10 would do what I needed since it had recently gone on sale for a substantial savings. But, after hearing the performance of the more powerful Klipsch models I knew I just had to have one. The local store was out of stock on the Synergy 10" so I was able to make a deal on the larger 12" model for about $50 off by complaining that I really wanted the 10" model they were out of (Oh Yeah!) I got the larger model with a 300 watt built in amplifier. This thing has been awesome. Very easy set-up, used the LFE connecter from my Denon AVR-2308 Receiver, and so far only have the sub at ½ gain on the volume/input and it fills the room with all the low-end frequencies I was missing before without being "boomy". I am only listening to music with this set-up. Home Theater is not quite as demanding as continuous music input. This really fills in the kick-drum and subtle, low-end Bass guitar notes.

I feel this sub has all the features anyone would probably want: variable crossover from 40-120 Hz, High level inputs and Low level (line) inputs, LOW frequency response = 24-120 Hz, Auto power On/Off, phase switch, very adequate power at 300 watts continuous (600 watt peak), and a 2 yr warranty.