The Reference 9s ($2610/pair) are compact, 160-watt, Class D monoblocks that feature switch-selectable balanced and single-ended inputs. NuForce VP Casey Ng stresses that these are "analog switching amplifiers" that offer wide bandwidth, minimal phase shift, and the ability to drive low-impedance loads. They might take you by surprise, with startling dynamics, a big and transparent soundstage, and outstanding resolution. The NuForce amps had a subtle, sophisticated, and refined quality reminiscent of the best high-end gear, coupled with explosive transient impact and center-of-the-earth bottom-end solidity and power. The Reference 9 SEs did, however, have a "chalky" coloration in the upper midrange and lower treble, along with a bit of truncation of the air riding on the top octave. Overall, however, I give the NuForce Reference 9 SEs a thumbs up.

Note: The TAS 166 review is a part of Special Report on Class D amps.