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Speaker amps for headphones - Page 158

post #2356 of 2665
Big thanks man. I am the king of analytical. I think mine is stock. I know the buffers muddy things up . But I do not use it for headphones just iem,s. .

Al
post #2357 of 2665
I've been reading quite a bit about SILEO but IMHO that seemed to be more like vaporware for now

http://www.head-fi.org/t/682415/sileo-the-battery-powered-balanced-hp-preamp-w-optional-usb-in-from-human-audio-made-in-europe

Have you guys ever tried something such as RWA's Signature 57 to drive something hungry like HE-6 or AB-1266 yet?

http://redwineaudio.com/components/signature-57
post #2358 of 2665
Quote:
Originally Posted by Canadian411 View Post
 
Quote:
Originally Posted by ALRAINBOW View Post

Take 8 ohm value and devide by 6.5. That will be aprox value at 50 ohms.

Al

 



Thanks, I wasn't even sure if speaker amps outputs any watt at that high ohm. Seems like the wpc ratio doesn't look linear.

In general, if you take the rated power P1 and multiply it by the rated impedance R1, then the power P2 at another impedance R2 is give by:

 

P2 = P1 * R1 / R2.

 

So, if you've got 60 W into 8 ohms and you want to know power available at 50 ohms then 60*8/50 = 9.6 W

 

Doesn't always work when going to smaller impedances because of current limits, or de-rating because of increased distortion at higher power levels, but its a good "rule of thumb" for estimating power to a higher impedance load.

post #2359 of 2665
Quote:
Originally Posted by zilch0md View Post

I've rolled a lot of op-amps through my iBasso PB2 and can easily hear remarkable differences - but not in THD+N.  biggrin.gif


I'm really looking forward to your follow-up posts regarding the PM6004.

I've been sitting on the fence regarding the purchase of a Marantz PM8004 ($999) as an amp for the LCD-2, ever since reading this very compelling review, over a year ago:  http://www.avguide.com/review/marantz-pm8004-integrated-amplifier-tas-220  


I sold my Emotiva mini-X a-100 because I found its treble to be harsh, even with the LCD-2's shelved highs (my tastes, my ears).


In the absence of hiss (as with the MG3), I, too, would feel no need to use resistors with the LCD-2 or LCD-3 attached directly to the speaker terminals of a PM8004 (rated at 75Wpc into 8 Ohms).


Wait.  Are you saying that Armegis thinks it's dumb, while you do not, or are you agreeing with Armaegis?    (For the record, I respect you both, greatly, so I'm very curious about this...)

Thanks,

Mike

I must confess to hearing very slight differences in Op Amps when I roll them in my Matrix M Stage amp.
Maybe it's the amp.
It's not the world's most transparent amp.

Do I think using 100 Watt per channel power amps for headphone is a bit off the wall?
The analytical part of my brain says yes. redface.gif

The emotional part of my brain says try it and see.
I plugged a few headphones into an old Yamaha CR-2020 I used to own.
Call me underwhelmed. Rather muddy, wooly and dynamically constricted.
But I do think it's strange using an amp with an output impedance of 220 Ohms to drive 'phones.

I plugged a pair of phones into the headphone jack on a Bryston 2B-LP.
Sounded better , but just gets a "not bad!" Rating.
Output impedance is 120 Ohms.
I'm not a big fan of huge output impedances, especially when I was using 62 Ohm cans at the time.

And i've plugged headphones straight into the speaker outputs of a Pass Labs X-150!
Now that's what I'm talk in' 'bout!
That's what I call entertainment!
I'm digging it, baby!
Now my jams are sounding pretty dope.
I guess you could say that I liked it!
I've never heard those phones sound better!

So you can see that my experience is rather limited.redface.gif
post #2360 of 2665

Haha!  I like the way your story ended, Chris!

 

Which headphones were you using with the Pass Labs?

 

As I had said regarding Gary's 110W into 8-Ohm Cyclops, I don't think your Pass Labs X-150 experience had so much to do with the amp's power rating as much as its "signature" - for lack of a better word.

 

It's what some of these HiFi amps bring to the table other than excessive power that's worthy of exploring with headphones.

 

Mike


Edited by zilch0md - 1/29/14 at 5:18am
post #2361 of 2665
Good morning cris.

I too have tried the HE 6 in over 10 amps. And speaker amps is all I have that drives them we'll. some play loud but as you stae under whelmed .

Amps that were not ok

HDVD800
WA22
PHONITOR
MYTEK 192
all portible amos and daps I own. Ex iBasso pb2.

Now amps that sound great and close to each other.
Wa5
Krell kav400xi
Audio gd M8
Audio gd ref 10
Denon avr 5805 ci
Denon avr 3805
Aragon 8008 BB

I do not think we need something so special as to spend thousands on a amp.

Al
post #2362 of 2665
post #2363 of 2665
Quote:
Originally Posted by zilch0md View Post

Haha!  I like the way your story ended, Chris!



 



Which headphones were you using with the Pass Labs?



 



As I had said regarding Gary's 110W into 8-Ohm Cyclops, I don't think your Pass Labs X-150 experience had so much to do with the amp's power rating as much as its "signature" - for lack of a better word.



 



It's what some of these HiFi amps bring to the table other than excessive power that's worthy of exploring with headphones.



 



Mike


 



Hi Mike,

You weren't supposed to ask!
LOL!
I used a 30 year old pair (yes thirty year old pair) of Sennheiser HD424 for the "Pass Labs test".
Main reason I used them for the "test" was they are 2,000 Ohms, so they need a lot of voltage, so the result was I did not have any problems with the volume control on the pre-amp....you know what I mean? I didn't have to set the volume control to between 8:29 and 8:31 o'clock to get a reasonable volume. And I didn't mind re-wiring the HD424 for balanced operation.
I think you are right, the combination sounds great because it is a mighty fine power amp. Period.
Same as Aidee's story.
He used his ultra awesome Plinius power amp to drive his LSDs.
If you've never heard of Plinius they are basically the Krell or the MarkLevinson of New Zealand.

BTW, the HD424 'phones are just "OK".
They aren't a fantastic sounding headphones.
But they definitely sound better via the Pass Labs.

Chris
post #2364 of 2665

Thanks Chris!

 

I like the way you write, by the way - very entertaining!  :D

 

Mike

post #2365 of 2665
Quote:

 

I think Luke and Leia are still trapped inside.

post #2366 of 2665
Quote:
Originally Posted by micmacmo View Post
 

 

I think Luke and Leia are still trapped inside.

 

I think you mean Han, but you may have a point...

 

 

 

vs

 

post #2367 of 2665
Quote:
Originally Posted by zilch0md View Post
 

Thanks Chris!

 

I like the way you write, by the way - very entertaining!  :D

 

Mike

 

Hey, thanks man!

 

:beerchug:

 

I will have a drink or two for you tonight!

post #2368 of 2665

I just published a free headphone calculator for the Android. It has power calculator and resistor network calculator pages along with help pages. I'm still deep in the development phase so any suggestions for additions or corrections would be appreciated.

 

Rob

 

In the  Google Play Store search for 'headphone calculator' or Rob Robinette.

 

Screen Captures

 
Screenshot_2014-02-06-06-55-20.jpg   Screenshot_2014-02-06-06-55-29.jpg  

 

 
Screenshot_2014-02-06-06-56-57.jpg   Screenshot_2014-02-06-06-57-07.jpg

Edited by robrob - 2/6/14 at 4:29am
post #2369 of 2665

Sweet!

post #2370 of 2665

I added resistor network power and current calculations to the Headphone Resistor Network Calculator spreadsheet. You input the amplifier output voltage and the spreadsheet shows amp power and current output and what actually flows through the headphones. Click on the pic for a clearer view.

 


Edited by robrob - 2/4/14 at 11:08am
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