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#366595 - 02/14/12 01:04 PM Re: Does all power amp sounded the same? [Re: mpyw]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1262
Loc: Quebec, Canada
a good quality amplifier does only one thing: make the signal stronger. that's all.

as regards comparative tests, the first thing to make sure of is that the amps MUST be adjusted to put out the same exact voltage with a given sine wave signal. a voltmeter must be used for that.

the brain is very finicky for SPL, but it has a very short memory.
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#366610 - 02/14/12 05:23 PM Re: Does all power amp sounded the same? [Re: mpyw]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8268
Loc: Tacoma
Bacon is delicious.
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#366614 - 02/14/12 05:34 PM Re: Does all power amp sounded the same? [Re: mpyw]
dakkon Offline
connoisseur

Registered: 02/08/04
Posts: 1844
Originally Posted By: J. B.
a good quality amplifier does only one thing: make the signal stronger. that's all.


The design of the amp has a lot to do with how it accomplishes the stronger signal, and what portion of the signal.

A class A amp, amplifies the entire sign wave, and is also the least efficient design.. a class AB amp only amplifies a portion of the sign wave which makes it more efficient than a class A amp, it is also less expensive to manufacture a class AB amp with the same power rating as a comparable class A amp. The Emotiva amp is a AB amp, the Odessey is a A/AB amp, and i could not find out the design of the Anthem, but i would guess is is a AB or some combination design... if the Odessey was operating in class A then that would possibly explain why it sounded the best and had the most dynamics. The Odessey most likely operates in the class A region for the first given % of the power, as you draw more power from it, it then switches to an AB operation, if you guys did not turn the volume up insanely loud the Odessey was probably operating in the class A region during your "testing" which was amplifying the entire sign wave, not a portion of it like the Emotiva is doing and possibly the Anthem as well... If you played all of the amps a higher volume, when all amps would be operating as an AB amplifier then i would guess there would be no discernable difference between them at that point.

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#366628 - 02/14/12 08:00 PM Re: Does all power amp sounded the same? [Re: mpyw]
mpyw Offline
local

Registered: 07/24/09
Posts: 279
Loc: Kuala Lumpur, Malaysia
when we change the amp, we re-run the Audessey of the Onkyo NR808 (as a pre amp) and all channel are calibrated to 75db using a radioshack SPL meter.

The volume dial on the Onkyo is at -10db all the time.

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#366630 - 02/14/12 08:24 PM Re: Does all power amp sounded the same? [Re: mpyw]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13318
Loc: Iowa
the problem is the huge delay in between setting each amp up, you need special equipment that you can switch in an instant from one amp to another, for a true blind a/b test.
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#366645 - 02/14/12 10:49 PM Re: Does all power amp sounded the same? [Re: tomtuttle]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7031
Loc: Canada
Originally Posted By: tomtuttle
Bacon is delicious.

Yeah, but nothing fries up bacon wraped deer links better than a class A amp. That there is a fact.

As for the topic, pick your side, buy your amp/receiver accordingly, be happy.
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Fred

-------
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#366647 - 02/14/12 10:54 PM Re: Does all power amp sounded the same? [Re: mpyw]
Ken.C Online   content
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
STOP TEMPTING ME!
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#366650 - 02/14/12 11:49 PM Re: Does all power amp sounded the same? [Re: mpyw]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
With deer or an avr/amp?
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Jason
-----------------
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#366672 - 02/15/12 08:55 AM Re: Does all power amp sounded the same? [Re: mpyw]
Ken.C Online   content
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
AVR. I have all the deer I can handle, I'm told.
_________________________
I didn't do it, no one saw me, you can't prove anything.

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#366685 - 02/15/12 11:42 AM Re: Does all power amp sounded the same? [Re: fredk]
avjunkee Offline
veteran

Registered: 07/28/10
Posts: 110
Originally Posted By: fredk
Originally Posted By: tomtuttle
Bacon is delicious.

Yeah, but nothing fries up bacon wraped deer links better than a class A amp. That there is a fact.


But do all amps taste the same?
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