Blind Listening Tests & Amplifiers

[Tube_Dude]

Hi Nw_avphile...and others...

For me there are two questions in this thead...the subjective acessement of amplifier sound quality and the Hafler nulling test!

Yes i agreed that all amps don't sound the same...as they also don´t have the same residual in the nulling test!
But as a pearson that use this test (for years)in the the acessement of the quality of my own designs...i have noted that every time i reduce the null...the sound quality improve the same proportion!!

I' remember the entangling of the Hi-Fi news /stereo revue crew...when they compare using the nulling test the hafler and a very expensive Audio Research...and some letters from David Hafler to Martin Coloms..

Many years have passed and the most powerfull tool in acessing amps linearity....is not only forgotten...but sometimes deliberately
ignored

So if we can use this test...and overcome the subjctive and dependent of state of mind analyses...i think that is a great help in amplifier design!!

Regards

PS : When you reduce the null residual ...don´t you agree with a improvement in sound quelity???

[SY]

There are a number of amps that would fare horribly on a null test that are, nonetheless, regarded by some as having an excellent sound quality. Not everyone is designing with the idea that an amp's output voltage should faithfully replicate the input voltage times a constant.

The null test (when front-to-back time is accounted for) is very useful to compare the degree of fidelity of amplifiers. It does not, however, tell you which errors are audible and which errors aren't. Only valid listening tests can tell you that.

[Steve Eddy]

Originally posted by SY
Take off your shoes-
For Industry!

Just noticed this.

Firesign Theater fan?

se

[Tube_Dude]

Not everyone is designing with the idea that an amp's output voltage should faithfully replicate the input voltage times a constant

Of corse...but for me this is role of a amplifier...to do amplification whitout nothing added nothing subtracted...
The wire with gain!!!

The null test (when front-to-back time is accounted for) is very useful to compare the degree of fidelity of amplifiers. It does not, however, tell you which errors are audible and which errors aren't.

But the nulling test let you even hear the residual null!!!
Thats the beauty of this test...

But if people prefer euphonic colorations...be free to enjoy it...but please don't call that High Fidelity Amplifiers...

[mrfeedback]

OK, Eric that must be it. I've got crappy speakers AND I'm an alcoholic.

LOL, LOL, LOL .....
Yeah, you too huh ?
Relax and enjoy it I say.

Regards,
Eric / - Gets To Tinker With A Lot Of Other Peoples Gear ......

[moe29]

I only posted that quote from Mr. Pass because i do agree with
what he was saying. If you're under the pressure of A/B
comparison - and someone is in your ear saying - do you hear a
difference? - - - that pressure or atmosphere is not how -
At least it's not how i - listen to music, and form opinions on the
worth of a piece of equipment.

[SY]

Firesign Theater fan?

Oh, yes. That ought to give you a clue as to my demographic and history.

More coffins, Warden?

[Steve Eddy]

Originally posted by SY
Oh, yes. That ought to give you a clue as to my demographic and history.

And geographically in Napa Valley. 'Nuff said.

More coffins, Warden?

No. MORE SUGAR! And stop eating with your hands. Use your entrenching tool.

se

[SY]

He's not your son, Fred.

[Steve Eddy]

Originally posted by SY
He's not your son, Fred.

Hehehe. Ok, let's give the folks a break before we're booted out of this thread for being off topic.

se