Technical Discussion
  >> Audio and Music Forum


Register (or login) on our website and you will not see this ad.


  Print Thread
Moderator billford
(moderator) Thu 09-Aug-12 22:39:44
Print Post

Dumping Factor


[link to this post]
 
My venerable tuner/amp died over the weekend, so time for a new one. I decided I didn't need a tuner so went for one of these (in black).

It's a nice piece of kit smile

I thought I knew my way around most HiFi stuff, however there's a term in the specification that I'm not familiar with: Dumping Factor.

It's given a value of 100 with an 8 ohm load over 40Hz to 20KHz, but can anyone tell me what the heck it means?

Bill
bill@thinkbroadband.com __________________Planes and Boats and ... __________________BQM
The author of the above post is a thinkbroadband moderator but it does not constitute an official statement on behalf of thinkbroadband.
Standard User micksharpe
(eat-sleep-adslguide) Thu 09-Aug-12 23:15:30
Print Post

Re: Dumping Factor


[re: billford] [link to this post]
 
Is it a current-dumping amplifier? Developed by Cambridge Acoustics (Quad) iirc.

'Sir, please,' she said... 'Will you not share your wisdom with us?'
'I have no wisdom,' he told her.
'Your experiences, then?'
'They have been trivial, uninteresting, and full of error.'
Ian M. Banks - Feersum Endjinn
.
It Ought to be Easy | Greasemonkey scripts
Standard User flippery
(regular) Thu 09-Aug-12 23:22:13
Print Post

Re: Dumping Factor


[re: billford] [link to this post]
 
Probably mean Damping Factor
Information easier to explain with google
http://www.bcae1.com/dampfact.htm


Register (or login) on our website and you will not see this ad.

Moderator billford
(moderator) Thu 09-Aug-12 23:27:02
Print Post

Re: Dumping Factor


[re: micksharpe] [link to this post]
 
If a current-dumping amplifier is the same as an amp with current-feedback, then yes.

Is it a broad parallel to what would be loop gain for voltage feedback?


(I wish you hadn't mentioned Quad... I've just been drooling over a pair of Quad electrostatics. No chance frown)

Bill
bill@thinkbroadband.com __________________Planes and Boats and ... __________________BQM
The author of the above post is a thinkbroadband moderator but it does not constitute an official statement on behalf of thinkbroadband.
Moderator billford
(moderator) Thu 09-Aug-12 23:30:31
Print Post

Re: Dumping Factor


[re: flippery] [link to this post]
 
In reply to a post by flippery:
Probably mean Damping Factor
I know about damping factor... but you could be right, the manual isn't entirely devoid of misprints!

Bill
bill@thinkbroadband.com __________________Planes and Boats and ... __________________BQM
The author of the above post is a thinkbroadband moderator but it does not constitute an official statement on behalf of thinkbroadband.
Standard User micksharpe
(eat-sleep-adslguide) Thu 09-Aug-12 23:42:38
Print Post

Re: Dumping Factor


[re: billford] [link to this post]
 
I agree with flippery. They almost certainly mean "damping factor."

Current dumping is a technique invented by Quad to avoiding supplying bias currents to the output transistors of class B amplifiers. I couldn't tell you if this is the same thing as current feedback. It never caught on because Quad's licensing fees were too high. There are technical descriptions on t'internet if you are uber-bored.

'Sir, please,' she said... 'Will you not share your wisdom with us?'
'I have no wisdom,' he told her.
'Your experiences, then?'
'They have been trivial, uninteresting, and full of error.'
Ian M. Banks - Feersum Endjinn
.
It Ought to be Easy | Greasemonkey scripts

Edited by micksharpe (Thu 09-Aug-12 23:42:59)

Moderator billford
(moderator) Fri 10-Aug-12 00:02:14
Print Post

Re: Dumping Factor


[re: micksharpe] [link to this post]
 
In reply to a post by micksharpe:
I agree with flippery. They almost certainly mean "damping factor."
Seems the most likely explanation, and one I completely hadn't thought of crazy
There are technical descriptions on t'internet if you are uber-bored.
Don't think I'll bother... particularly at this time of night!

Thanks both.

Bill
bill@thinkbroadband.com __________________Planes and Boats and ... __________________BQM
The author of the above post is a thinkbroadband moderator but it does not constitute an official statement on behalf of thinkbroadband.
Standard User cheshire_man
(knowledge is power) Fri 10-Aug-12 08:01:20
Print Post

Re: Dumping Factor


[re: billford] [link to this post]
 
If you download the product spec sheet 05_EN_PM5004.PDF from the Marantz web site it refers to Damping Factor.

Tony
  Print Thread

Jump to