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My usual practice when measuring an amplifier is to precondition the device by running it with both channels driven at one-third power into 8 ohms for an hour. Though these conditions are unlikely to be met in real life (other than in the well-known "Party Test"), they maximize the thermal stress on the amplifier if it uses, as do 99.99% of amplifiers brought to market, an output stage biased to run in class-B or -A/B.

The Perreaux R200i's heatsinks got hot very quickly at this power level; the integral heatsink-temperature display showed that, from an…

Editor: Thank you to Michael Fremer and John Atkinson for taking the time to review the Perreaux R200i in June 2003. It is refreshing to feel that the unit has been subjected to a reasonable level of scrutiny by your publication, and as such it is proper that our company be given the opportunity to respond:

Regarding the channel naming, to ease confusion in future, we will consider changing the rear-panel transfer. In the interim, we will consider changes to the product manual.

The Audio Physic Avanti III is rated at a nominal 4 ohms impedance. We…

Arnold Schoenberg began work on Gurrelieder in 1900 but kept finding himself interrupted, mostly by his need to earn money, which…

Description: Three-way, two=driver, stand-mounted, transmission-line loudspeaker. Drive-units: 1.2" fabric-dome tweeter, 6.7" PVC-coated paper-cone woofer with two voice-coils. Crossover: 3-way electrical at 600Hz and 4.8kHz, 6dB and 12dB/octave slopes, and a serial configuration for the midrange-treble crossover. Frequency range: 55Hz-22kHz. Nominal impedance: 4 ohms. Sensitivity: 90dB/W/m. Distortion: <1% at 84dB. Maximum SPL: 105dB. Maximum power handling: 115W.
Dimensions: 16" H by 8" W by 11" D. Weight: 15 lbs each.
Finish: Beech veneer.
Serial…

Analog sources: VPI TNT IV turntable, Immedia RPM tonearm, Koetsu Urushi cartridge; Rega Planar 3 turntable, Syrinx PU-3 tonearm, Clearaudio Virtuoso Wood, Aurum Beta S cartridges.
Digital sources: California Audio Labs Icon Mk.II Power Boss, Creek CD53 Mk.II CD players; Pioneer DV-333 DVD player.
Preamplification: Vendetta Research SCP-2D phono stage, Audio Valve Eklipse line stage.
Power amplifier: Audio Research VT100 Mk.II.
Integrated amplifier: Creek 5350SE.
Loudspeakers: Alón by Acarian Systems Petite, NHT SB-3, Polk RT25i.
Cables:…

The Twin Mk.III was of slightly above-average sensitivity, at an estimated 88dB(B)/2.83V/m. The impedance (fig.1) stayed above 6 ohms almost all the time, with a minimum value of 4.5 ohms at 190Hz. The speaker will therefore work well with modestly specified amplifiers. There is a significant glitch in both the magnitude and phase traces around 250Hz and a smaller one at 700Hz, which implies the existence of cabinet resonances of some kind. Investigating the enclosure's vibrational behavior with an accelerometer didn't reveal anything untoward at those frequencies…

The Pizza Hut near their house has a Kiddie Klub room off the main dining area, with pint-sized tables and chairs all set up in front of a big…

Laugh if you will at my priorities, but I'm much likelier to leave on a trip without my suitcase or my tickets than without a pair of Etymotic's unique "headphones." After all, what's more important: clean underwear or good music? Okay, okay—I'd rather have both, but what's personal hygiene compared to musical ecstasy?

The Etymotic Research ER-4S Canal Phone…