Topic: Alpha Dog Prime - Stream of Consciousness and Eventual Measurements (Read 16291 times)

CCS · « **Reply #130 on:** April 19, 2015, 02:14:38 AM »

What's the relevant calculation to get %distortion from the difference between its level and the frequency in question? That spike is absolutely unreal for a $1k headphone.

Marvey · « **Reply #131 on:** April 19, 2015, 02:20:35 AM »

-25db down from the fundamental is about 5-6% - this is at the spike.

CCS · « **Reply #132 on:** April 19, 2015, 02:32:40 AM »

Oh, Jesus. I'll have to look up the math for that, so that I can do those calculations for myself when nobody is around to give me the answer, but that puts things into perspective. Over 5% is madness. I don't know if that's just another defective pair, or if all units are going to have some poor distortion figures, but I certainly don't think the Alpha Prime will ever be a part of my desktop rig.

Hands · « **Reply #133 on:** April 19, 2015, 03:15:09 AM »

Or just use this site: http://www.sengpielaudio.com/calculator-thd.htm

Looks better and worse in some regards. And this is a good pair?

No_One411 · « **Reply #134 on:** April 19, 2015, 03:18:00 AM »

Marv, that 2nd pair is my pair right, and not Bill's?

I suppose you can preface that with...all Asians look alike.

Original_Ken · « **Reply #135 on:** April 19, 2015, 03:40:26 AM »

Alright, I made some time to read this thread.

So - measurements and QC issues aside - has anyone (considered relatively reliable by the membership herein) heard the Alpha Primes and considered them a further improvement over the Alpha Dogs ?

Marvey · « **Reply #136 on:** April 19, 2015, 03:56:17 AM »

Quote from: No_One411 on April 19, 2015, 03:18:00 AM

Marv, that 2nd pair is my pair right, and not Bill's?

I suppose you can preface that with...all Asians look alike.

lol. people keep sending me stuff. hard to keep track.

P.S. I did fiddle quite a bit to get both sides to match up as close to possible. The Primes are sensitive to positioning. I picked the best L and R results that matched the best. Took several measurements which involved complete removal of the headphone and placement back on the C.U.N.T.

riker1384 · « **Reply #137 on:** April 19, 2015, 04:09:32 AM »

Quote from: purr1n on April 19, 2015, 02:20:35 AM

-25db down from the fundamental is about 5-6% - this is at the spike.

I don't understand this. Every 10db is a factor of ten, right? So -25db should be 1/(10^2.5) = 0.00316 = 0.316%, right?

What am I missing? Apparently you're taking the square root of (10^2.5) for some reason.

Marvey · « **Reply #138 on:** April 19, 2015, 04:25:43 AM »

db = 20 x log(distperc/100)

distperc = 10 ^ ( db/20) x 100

10 ^ (-25/20) x 100 = 5.6234

OJneg · « **Reply #139 on:** April 19, 2015, 04:34:22 AM »

Quote from: riker1384 on April 19, 2015, 04:09:32 AM

I don't understand this. Every 10db is a factor of ten, right? So -25db should be 1/(10^2.5) = 0.00316 = 0.316%, right?

What am I missing? Apparently you're taking the square root of (10^2.5) for some reason.

You're thinking power. Factor of ten for voltage (SPL) is 20dB

Quote from: Original_Ken on April 19, 2015, 03:40:26 AM

Alright, I made some time to read this thread.

So - measurements and QC issues aside - has anyone (considered relatively reliable by the membership herein) heard the Alpha Primes and considered them a further improvement over the Alpha Dogs ?

Simply put, no

Author Topic: Alpha Dog Prime - Stream of Consciousness and Eventual Measurements (Read 16291 times)

CCS

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

Marvey

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

CCS

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

Hands

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

No_One411

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

Original_Ken

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

Marvey

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

riker1384

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

Marvey

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

OJneg

Re: Alpha Dog Primes - Stream of Consciousness and Eventual Measurements

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Author Topic: Alpha Dog Prime - Stream of Consciousness and Eventual Measurements (Read 16291 times)