Infinity Reference 311A Review
The Infinity Reference 311A is a mono subwoofer amplifier that is rated at 116 watts RMS @ 4 ohms (312 watts RMS x 1 @ 2 ohms). Infinity’s Dynamic Bass Optimizer (DBO) circuit matches variable bass boost with a variable subsonic filter to enable low frequency fine-tuning while still providing protection for your speaker. Other features include two sets of parallel output terminals for easy connection of multiple subwoofers, and an optional remote level control.
Unboxing the 311A, you’ll see accessories such as a patch cord, a power cable, a fuse, a grounding cable and a turn-on lead. In fact, the only thing not included are the speaker wires itself.
The 311A powered (with ease) almost everything that we paired it with—2 Rockford Fosgate 10″ Stage 1s and 2 12″ P3s, a Kenwood 10″ in a ported box, and a Kicker 10″ CompVR. Most of the time our gain was only set to -3 and it already rattled the mirrors. We could not even get the clip light to blink when we cranked it up. We noticed that this amplifier is efficient in delivering volume with less power.
As this is a semi-old model, the sound is actually still up par with today’s current amplifiers. RTA analysis measured lows of 19 Hz and highs of up to 280 Hz. This is a Reference series so this used to be on top of Infinity’s line-up.
Installation was a breeze, so long as you have some experience with amps and subs.
Other Specifications
| Frequency Response | 17 Hz – 302 Hz |
| Signal to Noise Ratio | 81 dB |
| THD @ RMS Power | 1% |
| Input Voltage | 14.4 v |
| Amplifier Class | AB |
| Bass Boost | 12 dB |
| Bass Boost Frequency | 20 – 80 Hz |
| Width | 12″ |
| Depth | 11.44″ |
| Height | 2.69″ |
Infinity Reference 311A top
Infinity Reference 311A right
Infinity Reference 311A left
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