Welcome, Guest. Please Login or Register
Decware Audio Forums
02/27/21 at 18:15:09 


       


Pages: 1
Send Topic Print
Distortion on max volume (Read 159 times)
tcb-38
Verified Member
**




Posts: 23
Distortion on max volume
02/19/21 at 18:05:11
 
Usually I listen at 12:00 volume but I open the volume at max on one track and distortion were unbearable. I never had such a bad sound ever.
I swap every tube but same distortions. My speakers are Omega SAM
What could be?

Track 4 was from Jessica Young album "When I fall in love"
Back to top
 
 
  IP Logged
Archie
Seasoned Member
****




Posts: 2172
Re: Distortion on max volume
Reply #1 - 02/19/21 at 18:36:29
 
Not sure I understand your point but once you exceed the maximum input voltage for the amp, you can expect distortion.  At my preferred CSP3 settings I run my ZMA pot from about 8 to 10 o'clock.
Back to top
 
 

ZLC
Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods) -- currently not in use
CSP3 (25th A mods)
ZMA (25th A mods)
Homemade Big Betsy Speakers (F15s)
Silver Cabling
DIY Isolation platforms under amps & TT.
  IP Logged
tcb-38
Verified Member
**




Posts: 23
Re: Distortion on max volume
Reply #2 - 02/19/21 at 18:38:59
 
I'm saying I did not expect distortion at full power 2W with volume pot full open.
Back to top
 
 
  IP Logged
tcb-38
Verified Member
**




Posts: 23
Re: Distortion on max volume
Reply #3 - 02/19/21 at 18:55:56
 
And how can someone exceed the maximum input voltage,please?
Signal is coming from my RME ADI2 dac.
Thanks
Back to top
 
 
  IP Logged
Archie
Seasoned Member
****




Posts: 2172
Re: Distortion on max volume
Reply #4 - 02/19/21 at 19:12:39
 
Your source puts out a voltage.  Typically a DVD player might put out 2 volts.  An amp is rated to not clip at it's max input voltage at full volume.  Steve's amps vary from amp to amp but my ZMA reaches full volume with a 2 volt input.  The CSP3 can push out 30 volts!  So, as I dial up my CSP3 past a 2 volt output, I have to dial back my ZMA pot from fully on.  At my current CSP3 settings and my TT source, I am pushing 4 to 5 volts into my ZMA so I have to "throttle back" my ZMA so it allows no more than 2 volts into it.  The ZMA pot goes from closed to fully open, like a faucet tap.  

I hope I've given a clear explanation but this is how I understand it.

Check the specs on your DAC, it should say what it's maximum output is.  Sometimes you can throttle back a source.  My OPPO DVD player has its own volume control, which I assume just regulates output voltage.
Back to top
 
 

ZLC
Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods) -- currently not in use
CSP3 (25th A mods)
ZMA (25th A mods)
Homemade Big Betsy Speakers (F15s)
Silver Cabling
DIY Isolation platforms under amps & TT.
  IP Logged
Lin
Seasoned Member
****




Posts: 390
Re: Distortion on max volume
Reply #5 - 02/19/21 at 19:48:48
 
What is the output level of your dac set to?
Back to top
 
 

DGSE-1 (redesigned Magnavox) 6BQ5/EL84 SEP ~ 4 watts
Ampex 6973 U/L P/P ~ 15 watts
  IP Logged
tcb-38
Verified Member
**




Posts: 23
Re: Distortion on max volume
Reply #6 - 02/19/21 at 19:52:42
 
It is not listed for RME ADI-2
Only show as dB:
In the ADI2 DAC menu, the output is adjustable within this range
-5db
+ 1db
+ 7db
+13 db
Found this calculator but don't understand it...yet Smiley
http://www.sengpielaudio.com/calculator-db-volt.htm
Back to top
 
 
  IP Logged
Lin
Seasoned Member
****




Posts: 390
Re: Distortion on max volume
Reply #7 - 02/19/21 at 22:39:00
 
Do you have it set high or low?
It will affect the v/c position of the amplifier and at what position it starts to distort.
Back to top
 
 

DGSE-1 (redesigned Magnavox) 6BQ5/EL84 SEP ~ 4 watts
Ampex 6973 U/L P/P ~ 15 watts
  IP Logged
Dominick
Seasoned Member
****


Still like that old
time Rock and Roll!!

Posts: 463
Re: Distortion on max volume
Reply #8 - 02/19/21 at 22:47:42
 
Are you using the balanced or the RCA outs on the DAC?  There are presets that you can choose...which correspond to the numbers you posted.

Start on page 62 of the manual and go from there.

https://www.rme-audio.de/downloads/adi2dac_e.pdf

It looks like you may have to lock out the volume control.  This could based on whether you are using the balanced or the unbalanced signal output.  Based on the settings, clipping the amp would happen if your signal is too hot.

Dom
Back to top
 
 

iMac 7 or Google Chromecast Audio, Schiit Bifrost True Multibit DAC, My Audio Cables [MAC] Ultra Silver+ Cables, ZSB, ZSTAGE [Beeswax Caps], DAG Cables, Yamaha THX SS Receiver, Rega P3 Turntable, Velodyne Dual Firing Sub, Decware ERR Radials [Bubbinga Wood].
  IP Logged
tcb-38
Verified Member
**




Posts: 23
Re: Distortion on max volume
Reply #9 - 02/20/21 at 22:41:22
 
Thanks,Signal was too hot from Roon/Tidal for that album listed above.
Ya,it's just the correlation between preamp dac volume and SE84UFO amp volume. I'll play more to find out the sweet spot Smiley
Back to top
 
 
  IP Logged
Pages: 1
Send Topic Print