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Post by willcycle on Feb 15, 2013 6:45:14 GMT -5
I noticed a faint flickering of the front panel LEDs of my XPR2 when set to any of the dim modes. This is most likely due to the use of a chopping circuit which pulses the current running through the devices to obtain a lower light output. I wondered if this pulsing frequency could modulate the audio signal affecting the sound of the amp. I set the LEDs to full brightness (i.e. constant DC power) and did some comparison listening to my previous third from dimmest setting. I can hear a distinct improvement in imaging and smoothness. The difference is certainly not dramatic, but clearly noticeable on my system. I will be listening to the amp on full LED brightness and meter function off from now on.
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Post by ocezam on Feb 15, 2013 8:51:27 GMT -5
I noticed a faint flickering of the front panel LEDs of my XPR2 when set to any of the dim modes. This is most likely due to the use of a chopping circuit which pulses the current running through the devices to obtain a lower light output. I wondered if this pulsing frequency could modulate the audio signal affecting the sound of the amp. I set the LEDs to full brightness (i.e. constant DC power) and did some comparison listening to my previous third from dimmest setting. I can hear a distinct improvement in imaging and smoothness. The difference is certainly not dramatic, but clearly noticeable on my system. I will be listening to the amp on full LED brightness and meter function off from now on. If what you report is true, and I don't doubt you, but the average person may not be able to hear such a minute difference, then I'm guessing the amp would also sound better with the lights completely off? |
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