What causes increasing harshness as the volume goes up? - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th December 2003, 06:00 PM   #1
diyAudio Member
 
Join Date: Sep 2002
Location: Oregon, USA
Default What causes increasing harshness as the volume goes up?

Just wondering what the various factors are that would contribute to this.

The most obvious one would probably be the drivers themselves compressing and distorting, right. I wonder if that's the case with mine though - they're 97dB sensitive and use pro audio drivers, and I was barely reaching 90dB peaks.

I guess it could be the amp running out of steam (it's only 3.5W) - would that be the next most likely cause?

I'm also wondering if my speakers are brighter than they should be, and this is the Fletcher Munson curves coming into effect - the tonal balance in the treble sounds better when the volume is turned down, but the treble starts to become relatively too strong as I reach more realistic volume levels?

What else? Increased vibrations affecting exposed microphonic tubes?

I just noticed this last night, with one particular CD. So maybe it was more psychological than anything else. I was playing at the same volume level I usually play my music at, and I haven't felt the sound to be too harsh before. Could it be something in the recording that makes one specific CD behave this way?

Any insights would be most helpful.

Thanks,
Saurav
  Reply With Quote
Old 17th December 2003, 06:13 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
I guess it could be the amp running out of steam (it's only 3.5W) - would that be the next most likely cause?
IMO yes, its how often its clipping, which goes up with apparent volume.
(average volume is ~ 25dB below peak levels that cause clipping)

sreten.
  Reply With Quote
Old 17th December 2003, 06:20 PM   #3
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
I'm also wondering if my speakers are brighter than they should be, and this is the Fletcher Munson curves coming into effect - the tonal balance in the treble sounds better when the volume is turned down, but the treble starts to become relatively too strong as I reach more realistic volume levels?
Sounds perfectly sensible to me, the treble level
should be adjusted to suit normal listening levels.

A flat resonse at 86dB to 88dB for one watt, typical for
speakers isn't the same as a flat response at 97dB/watt.

sreten.
  Reply With Quote
Old 17th December 2003, 06:54 PM   #4
Banned
 
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
Send a message via Yahoo to Elso Kwak
Lightbulb Increased Harsness????

Huh, increased harsness????
Just have a look at this post!:
http://www.diyaudio.com/forums/showt...991#post281991
  Reply With Quote
Old 17th December 2003, 07:31 PM   #5
diyAudio Member
 
Join Date: Sep 2002
Location: Oregon, USA
Are there any easy ways to determine if I'm sending my amp into clipping? And I guess I can tone my tweeters back down some more.
  Reply With Quote
Old 17th December 2003, 08:08 PM   #6
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
try this :

http://sound.westhost.com/project23.htm

sreten.
  Reply With Quote
Old 17th December 2003, 08:15 PM   #7
diyAudio Member
 
Join Date: Sep 2002
Location: Oregon, USA
Hmm... I'm not sure if that will work for a tube amp. My grasp of this is very feeble, but I think the flyback effect in the output transformers allows the output voltage to rise above the supply voltage. AFAIK, that is not considered clipping.
  Reply With Quote
Old 17th December 2003, 08:36 PM   #8
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
I'm certain the design doesn't suit valve voltage rails.

Literally you can hear clipping in a valve amplifier, though
its not as painfully obvious as a transistor amplifier.

A simple LED/Zener/resistor/capacitor circuit can be
used to monitor output level set at 3W into 8 ohm.

sreten.
  Reply With Quote
Old 17th December 2003, 08:48 PM   #9
diyAudio Member
 
Join Date: Sep 2002
Location: Oregon, USA
OK, so implement one of the more conventional comparator circuits that he was talking about? That could be done.

Thanks for the help.
  Reply With Quote
Old 17th December 2003, 09:21 PM   #10
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
You don't even need a comparator.

do a web search - you should find something.

'amplifier power output indicator'

assuming symmetrical voltage swing

The zener or diodes + LED forward drop determines the
threshold, the resistor limits LED current, the capacitor
lengthens the indication so you can see it.

sreten.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Increasing Iq Skorpio Solid State 0 8th May 2007 07:57 PM
sheng ya cd o2 harshness duderduderini Digital Source 2 17th May 2006 02:46 PM
Changing the filter to remove harshness Ralph Multi-Way 36 15th October 2005 08:33 PM
Increasing cabinet volume ?? Flappytango Multi-Way 7 6th March 2004 01:15 AM
Increasing 2nd HD nowater Pass Labs 18 29th July 2003 06:42 AM


New To Site? Need Help?

All times are GMT. The time now is 07:03 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2