Did you ever get a measurement of the high frequency distortion coming out of the speakers? Was REW showing super low distortion, even though you could hear it coming through the speakers as the sweep was playing? I have found that REW can't always distinguish distortion from background noise or late reflections.
This One has Me Stumped
I recently purchased a Pass XP-12 to replace my aging ML 38s. After installation, I noticed gobs of high frequency distortion, especially in Operatic female voices.
I measured every component in the signal chain separately. All are performing in spec.The XP-12 has very impressive test results.
Re-installing the 38s gets me immediately back to more mellow sound.
In my system, I have an EQ and crossover between the XP-12 and my Bryston 2.5b^3 power amp. I removed the EQ and the XO, plugging the XP-12 directly into the power amp. The distortion remains.
I am puzzled. I am a measurement guy. I use REW extensively. I can measure and troubleshoot almost any problem in my system. This one is a stumper.
Can anybody suggest a measurement or a way to solve this apparent component mismatch?
My system in order from source to output :
Shelter 901 MKIII MC or Koetsu RS MC cartridges
Parasound Zphono XRM phono preamp
Technics SL-1200G TT
Oppo BDP-105 Universal player (digital)
Bryston BDA-3 D/A ( feeds the Oppo signal to the XP-12 or 38s)
Sansui TU-X1 tuner
XP-12 (38s) line amp
dBx 1231 EQ
Rane AC22 2 way crossover
Bryston 2.5B^3 power amp
Usher 604 floorstanding speakers
HSU ULS-15 sub (when using the XO)
Thanks,
Kevin
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- 27 posts total
- 27 posts total