- Written by Jim Clements
- Published on 22 October 2012
Legacy Classic HD Speakers On The Bench
All the below measurements shown are in-room response. The frequency response tests were performed at 1-meter, the distortion measurements were on-axis near field measurements.
The on-axis response of the Legacy Classic HD's shows an exceptionally flat spectrum from 35 Hz to 20 kHz. There are some room-induced fluctuations in the bass below 200 Hz.
At 30 degrees off-axis, the Classic HD's had a response curve that was expectedly not as smooth as the on-axis test, but it still has flat treble past 16 kHz. The bass showed a little more unevenness on this test as well.
The THD at 1 kHz and 95 db was 0.33%, with the first harmonic more than 50 db below the test signal.
At 500 Hz and 95 db, the THD measurement is an inaudible 0.14%. This is a very clean test plot.
The Classic HD's had just 0.12% THD at 5kHz and 95 db.
At 10 kHz and 90 db, the distortion was amazingly low at just 0.16%. These tweeters are sweet and extended and the low distortion is probably one reason the Classic HD's could be enjoyed for hours without fatigue setting in.
I tested the Classic HD's at 95 db and 40Hz to verify their output near the cabinet's tuning frequency. This is another clean test plot with just 2.70% THD; very good response characteristics for a pair of passive 8" drivers.
The Metro sub has a 6th order alignment and so the response drops off quickly below its tuning frequency - probably a big part of the subjectively tight bass response. The upper useable limit is over 150 Hz.
At 100 Hz and 95 db, the distortion was amazingly low for a sub – 0.15%.
The sub stayed clean at 80 Hz with just 0.15% THD at 95 db at 80 Hz.
Here you see that the sub hit 8.7% THD at 90 db when tested at 24 Hz. This is a good test result for a compact sub.