- Written by Jim Clements
- Published on 09 September 2013
The Revel Performa 3 M105 Bookshelf Speakers On the Bench
All below measurements are in-room response. The frequency response tests were performed at 1-meter, the distortion measurements were on-axis near field measurements with the mic tip precisely 1' from the driver under test.
The on-axis response of the M105's shows an exceptionally flat spectrum from 300 Hz to 24 kHz. There are some room-induced fluctuations in the bass below 300 Hz.
At 30 degrees off-axis, the M105's had a response curve that was nearly as smooth as the on-axis test with surprisingly good treble extension. Again, the unevenness below 300 Hz is due to room effects. This plot confirms the good dispersion characteristics of the M105's.
The THD at 1 kHz and 100 dB was 0.12%, with the first harmonic 62 db below the test signal.
At 500 Hz and 100 dB, the THD measurement was 0.39%.
The distortion reading rose to 0.44% at 250 Hz and 100 dB.
When I got down to 60 Hz, the distortion would rise quickly as I increased the volume over 90 dB. The above plot shows the 90 dB distortion spectrum which was quite clean with a measured THD of just 0.60%.
At 5 kHz and 100 dB, the measured THD was only 0.09%.
The THD at 10 kHz and 95 dB was also extremely low at just 0.11%. This may partly explain the tweeter-centric love affair I had during my review.