I am not sure I have this problem with my Lumin U1 Mini, the amp, ROON, speaker, power, or any thing in the chain.
Digital front end streaming: fiber connection to EtherGen->Lumin U1 mini (latest firmware) ->USB->Matrix->IS2 to PSAudio DSD, plugged into PSAudio Stellar power regen.
Preamp- CJ ACT2.2- plugged into PSAudio Stellar.
Amp- 220 watt tubed Monos plugged into PoweWedge.
Digital Playback: software Roon/Mimiserver, Dell desktop PC, music files on HDD.
The problem: When I play one DSF file of an album at volume level 67/100 or higher, the song started playing then at around 1:17 minute the left mono amp shut down and restarted. Other files/songs in the same album do not have this issue.
I have done the following to isolate the problem:
swap output L and R from preamp, the problem did not follow to the R channel.
both ROON and Mini server had same issue.
swap input tubes of mono amps, left amp still had problem.
lower volume to 60/100, no issue.
played same song but on WAV format, no issue.
I suspected it could be the L amp, I had it checked, but could not find any issue with it. It could be that the signal spiked along the digital chain and clip the amp.
I may try the following to further isolate:
swap speaker cables to see if amp/speaker interaction problem.
swap output tubes of amps.
copy the song onto disc and play from DVDA player.
swap out mono amps to using stereo solid state amp.
Any suggestions what I should do to troubleshoot? One solution is to delete that song or any songs that caused the amp shut down. Thanks for reading and any comments.
My findings: #1 show clipping (red) through out the song. #2 USB input clipped amp and shut it down. #3 Reduced headroom by -3db could play whole song but still show clipping. I tried reduce by -2db but increase vol to 69/100 then shut amp.
This song (Hotel California) has high headroom. Other songs in this album have no clipping signal.
Conclusion: reduce volume when playing this song? Any other alternative?
I do not use DSP upsampling.
Since my speakers are highly insensitive and demand current and power from amps, for few songs in my music DB have clippings, I may have to play those at lower SPL to overcome the issue. Thanks for suggestions about analysis software. XiVero business was closed. I am not sure Audacity can handle DSF file. I can rely on Roon’s headroom to help with detect clipping files.