ericmp1989
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- Feb 4, 2025
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I also posted this in the HTP-1 group on AVS, but since there’s a lot of Class D amp expertise here, I figured I’d ask.
I recently bought an HTP-1 and two Buckeye Hypex NC502MP 6-channel amps. Coming from a Denon 8500, a 2x4HD, and Audyssey MultEQ-X, the learning curve has been steep. I successfully ran Dirac, followed the procedure to ensure no clipping, and (or so I thought) set the trims to 75dB. I used the "THX-like" tone in the HTP-1 for calibration and verified the levels with both the REW SPL meter and a handheld meter.
Here’s where my issue starts: The volume keeps changing. I should also note that it doesn't matter if Dirac is on or off.
Yesterday, I had everything perfectly calibrated at 75dB. This morning, I put on a demo, and something felt off. I checked with the REW SPL meter and a second handheld meter—both were now reading around 72–73dB for every channel.
To be sure, I reset the HTP-1, ran Dirac from scratch, and again landed at 72–73dB. I figured that was still plenty loud, so I set the trims accordingly and moved on.
I didn’t change a thing—my mics never left their spot. After a trip to the eye doctor, I came home, put on RP1, and suddenly, it sounded like some speaker trims were higher than others. Running the THX-like noise test again, I was now getting 76–78dB per channel.
I once again set everything back to 75dB, went to eat dinner, came back 20 minutes later, and now every channel is reading 63–68dB—without touching a thing. The main volume was still at 0dB.
What am I missing here?
I recently bought an HTP-1 and two Buckeye Hypex NC502MP 6-channel amps. Coming from a Denon 8500, a 2x4HD, and Audyssey MultEQ-X, the learning curve has been steep. I successfully ran Dirac, followed the procedure to ensure no clipping, and (or so I thought) set the trims to 75dB. I used the "THX-like" tone in the HTP-1 for calibration and verified the levels with both the REW SPL meter and a handheld meter.
Here’s where my issue starts: The volume keeps changing. I should also note that it doesn't matter if Dirac is on or off.
Yesterday, I had everything perfectly calibrated at 75dB. This morning, I put on a demo, and something felt off. I checked with the REW SPL meter and a second handheld meter—both were now reading around 72–73dB for every channel.
To be sure, I reset the HTP-1, ran Dirac from scratch, and again landed at 72–73dB. I figured that was still plenty loud, so I set the trims accordingly and moved on.
I didn’t change a thing—my mics never left their spot. After a trip to the eye doctor, I came home, put on RP1, and suddenly, it sounded like some speaker trims were higher than others. Running the THX-like noise test again, I was now getting 76–78dB per channel.
I once again set everything back to 75dB, went to eat dinner, came back 20 minutes later, and now every channel is reading 63–68dB—without touching a thing. The main volume was still at 0dB.
What am I missing here?