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post #1411 of 10927

I am considering two amps to drive the HE-560 phones. I chose them because they are powerful and well recommended.

 

1. Schiit Mjolnir

 

     8 watts/ch. into 32 ohms

     5 watts/ch. into 50 ohms

 

2,  Emotiva Mini-X a100 (a speaker amp)

 

     50 watts/ch. into 8 ohms

 

Two questions:

 

1.  Does anyone know how to predict the power of the Emotiva into 32 ohms?

 

2,  I've seen many strong recommendations of speaker amps for inefficient phones such as the HE-500.  (The HE-560 is 1 dB more efficient than the HE-500 but that difference is negligible.)  Are the recommendations for speaker amps simply based on their greater power or is there something else at work?

post #1412 of 10927
Quote:
Originally Posted by Headphoner View Post
 

I am considering two amps to drive the HE-560 phones. I chose them because they are powerful and well recommended.

 

1. Schiit Mjolnir

 

     8 watts/ch. into 32 ohms

     5 watts/ch. into 50 ohms

 

2,  Emotiva Mini-X a100 (a speaker amp)

 

     50 watts/ch. into 8 ohms

 

Two questions:

 

1.  Does anyone know how to predict the power of the Emotiva into 32 ohms?

 

2,  I've seen many strong recommendations of speaker amps for inefficient phones such as the HE-500.  (The HE-560 is 1 dB more efficient than the HE-500 but that difference is negligible.)  Are the recommendations for speaker amps simply based on their greater power or is there something else at work?


50 Watts RMS into 8 ohms is 20 Volts RMS.

20 Volts RMS over 32 ohms is 12.5 Watts.

(That presumes that the voltage does not vary much with change in load, and all else being equal).

post #1413 of 10927
Emotiva might possibly be too much.
post #1414 of 10927
Quote:
Originally Posted by Headphoner View Post

I am considering two amps to drive the HE-560 phones. I chose them because they are powerful and well recommended.

1. Schiit Mjolnir

     8 watts/ch. into 32 ohms
     5 watts/ch. into 50 ohms

2,  Emotiva Mini-X a100 (a speaker amp)

     50 watts/ch. into 8 ohms

Two questions:

1.  Does anyone know how to predict the power of the Emotiva into 32 ohms?

2,  I've seen many strong recommendations of speaker amps for inefficient phones such as the HE-500.  (The HE-560 is 1 dB more efficient than the HE-500 but that difference is negligible.)  Are the recommendations for speaker amps simply based on their greater power or is there something else at work?
Thats utter BS. You don't need a speaker amp for HE-500 unless you want 2% of volume adjustment. An Audio GD amp is what I would get if you are worried about power.
post #1415 of 10927
Lol, dude, don't provoke a schiit storm. Anyway when buying an emo you must know the cons too.
post #1416 of 10927

You don't need a speaker amp for the HE-500.  Any reasonably powerful headphone amp will do fine.  That being said, should you already own a HE-6, intend to get one, or have a speaker amp lying about it might not be a bad idea though it's a step not to be taken lightly and you need to do your homework.

 

It's not just a matter of slinging power, you need to take into consideration the noise floor of the amp, attenuation when driving your cans from the speaker posts, load matching if it's a tube power amp etc.  And also the limited use with other, more efficient headphones.

 

Might save you some money though, depending on what you get.  Just beware of blown drivers/eardrums and if using without attenuation, make a routine out of turning the volume to zero systematically before removing/connecting the headphone and switching on/off the amp.  If you're the easily distracted type then I'd probably go for a headphone amp myself.

 

The Emo should deliver about 11 W into 38 Ohm.

post #1417 of 10927

I think that 90db/mW means that 10^((115 - 90) / 10) = 10^2.5 = 316mW at 35ohms will be good enough to drive HE-560 into 115dB which is the maximum level for highly dynamic music (like classical). So for example O2 amp has two times more power than needed to drive them. I see no reason to use speaker amp here.


Edited by ieee754 - 4/20/14 at 5:21am
post #1418 of 10927
Quote:
Originally Posted by grizzlybeast View Post
 

all the revisions didnt make them sound like a whole different model, They fixed annoyances and I am sure they wont mind doing it again but I guarantee that even you yourself used them to develop an idea of what the 560 will sound like. When after or desiring certain aspect like soundstage width then you can pretty much be smart enough to determine that the he560 is not going to sound as closed as an lcd2 or he500 even and thats valuable. Again, ballpark impressions are still valuable. Especially if you are going to preorder. 

I see no one has asked this yet so I will.  Why not the HD800 if soundstage is a top priority?

post #1419 of 10927
Quote:
Originally Posted by ieee754 View Post
 

I think that 90db/mW means that 10^((115 - 90) / 10) = 10^2.5 = 316mW at 35ohms will be good enough to drive HE-560 into 115dB which is the maximum level for highly dynamic music (like classical). So for example O2 amp has two times more power than needed to drive them. I see no reason to use speaker amp here.

That discussion again? Thought we finally were done with that weekly O2 discussion thing? It leads nowhere.

 

Is 115 dB enough? Probably

post #1420 of 10927
Quote:
Originally Posted by davidsh View Post
 

That discussion again? Thought we finally were done with that weekly O2 discussion thing? It leads nowhere.

 

Is 115 dB enough? Probably

I'm just saying that amp which can output more than what I calculated will drive them fine (most headphone amps seems to have more than 300mW) and there is no need to use speaker amps as some people asked.

post #1421 of 10927
No there isn't but you might save a bit of money that way and lose nothing.
post #1422 of 10927
Quote:
Originally Posted by Frank I View Post
 

he 560 weight is 13.7 ounces. The lightest ortho currently in production. The 560 continues to impress and will start writing the review this week and submit it for publication and keep everyone posted. 


The T50RP is 58 grams lighter.

post #1423 of 10927

According to the Fostex website, the T50RP is dynamic, not ortho. 

post #1424 of 10927

T50RP is definitely planar magnetic.  So many mods have been made from it.  However I'm not sure if it's even worth considering it at its unmodded state.

post #1425 of 10927
I would be surprised if Fostex says it is a dynamic :-)
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