Stereophile

MEASUREMENTS

I used DRA Labs’ MLSSA system and a calibrated DPA 4006 microphone with an Earthworks microphone preamplifier to measure the Audiovector QR 7’s farfield frequency response and dispersion. I used an Earthworks QTC-40 mike for the nearfield and in-room responses and Dayton Audio’s DATS V2 system to measure the impedance magnitude and electrical phase angle.

Audiovector specifies the QR 7’s anechoic sensitivity as 90.5dB/W/m. My estimate was slightly lower, at 88.7dB/2.83V/m, though this is still higher than average. The QR 7’s impedance is specified as 6 ohms. The impedance magnitude (fig.1, solid trace) varied between 5 ohms and 12 ohms in the midrange and treble, with a still drops below 3 ohms between 57Hz and 140Hz, with a minimum value of 1.8 ohms at 76Hz. As long as the partnering amplifier can drive 4 ohms, the QR 7 shouldn’t present it with any drive problems.

You’re reading a preview, subscribe to read more.

More from Stereophile

Stereophile4 min read
Letters
When my Stereophile reaches my doorstep, the first thing I turn to is Herb Reichert’s reviews. I don’t care what he’s reviewing; I love how he writes about it. In April’s edition, he shared his thoughts on an unexpected emotional response to Brice Ma
Stereophile9 min read
Tom Waits
In 2022, Tom Waits decided it was time to remaster the albums he made during his stint at Island Records. The Waits classics Swordfishtrombones (1983), Rain Dogs (1985), Franks Wild Years (1987), Bone Machine (1992), and the Waits (with Robert Wilson
Stereophile3 min read
Measurements
I performed a complete set of measurements on one of the Linn Klimax Solo 800s (serial number 1593390) with my Audio Precision SYS2722 system.1 I preconditioned the Solo 800 by following the CEA’s recommendation of running it at one-eighth the specif

Related