BurgerCheese
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I decided to do some casual distortion measurements on my pair of UB5 slim as I couldn't remember the distortion being as bad as in this review.
Tested with REW and UMIK-1. Observations:
At 86dB/1m, distortion peaks at:
- 270 hz, 1.5% THD, 2nd+ 3rd order. Appears to come from midrange.
- 550 hz, 1% THD, 2nd + 3rd order. Appears to come from enclosure (resonance)
- 700 hz, 1% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on right speaker!
- 1700hz, 1% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on left speaker!
- 2700hz 1.5% THD, mostly 3rd order. Appears to be midrange cone breakup. Distortion peak not present when measuring off-axis.
- 8000hz 0.5% THD, 2nd order. Tweeter breakup? But only on left speaker!
At 96db/1m, distortion peaks at:
- 270 hz, 3% THD, mostly 2nd order. Appears to come from midrange.
- 550 hz, 2.5% THD, 2nd + 3rd order. Appears to come from enclosure (resonance)
- 700 hz, 2.5% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on right speaker!
- 1700hz, 2% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on left speaker!
- 2700hz 2.5% THD, mostly 3rd order. Appears to be midrange cone breakup. Distortion peak not present when measuring off-axis.
- 8000hz 1.5% THD, 2nd order. Tweeter breakup? But only on left speaker!
Distortion figures are a bit lower than what amirm measured, but still pretty bad. The differences between right and left speaker might indicate poor QC.
Tested with REW and UMIK-1. Observations:
At 86dB/1m, distortion peaks at:
- 270 hz, 1.5% THD, 2nd+ 3rd order. Appears to come from midrange.
- 550 hz, 1% THD, 2nd + 3rd order. Appears to come from enclosure (resonance)
- 700 hz, 1% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on right speaker!
- 1700hz, 1% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on left speaker!
- 2700hz 1.5% THD, mostly 3rd order. Appears to be midrange cone breakup. Distortion peak not present when measuring off-axis.
- 8000hz 0.5% THD, 2nd order. Tweeter breakup? But only on left speaker!
At 96db/1m, distortion peaks at:
- 270 hz, 3% THD, mostly 2nd order. Appears to come from midrange.
- 550 hz, 2.5% THD, 2nd + 3rd order. Appears to come from enclosure (resonance)
- 700 hz, 2.5% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on right speaker!
- 1700hz, 2% THD, mostly 2nd order. Appears to come from enclusure (resonance). But only on left speaker!
- 2700hz 2.5% THD, mostly 3rd order. Appears to be midrange cone breakup. Distortion peak not present when measuring off-axis.
- 8000hz 1.5% THD, 2nd order. Tweeter breakup? But only on left speaker!
Distortion figures are a bit lower than what amirm measured, but still pretty bad. The differences between right and left speaker might indicate poor QC.