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So, I'm looking for that perfect amp... - Page 58

post #856 of 930
The HE6 requires a lot of current which the portaphile 627 can provide smily_headphones1.gif
OTLs which provides a big voltage swing but can't provide sufficient current is futile for the planar HE6 smily_headphones1.gif
post #857 of 930
Quote:
Originally Posted by headwhacker View Post
 

 

It will still dependent on the phone you are using. IEMS I'm pretty sure won't have a problem. I guess at least 90% of the headphones out there won't have a problem with the UHA-6SMKII.

 

Heck the portaphile 627 can even drive HE-6 using only a single 3.7V power supply. I'm not familiar with the amp design used (Jung multi-loop) but based on the power supply, I can't imagine that amp can provide more than 7 (-/+ 3.7) volts swing to a load.

Perhaps it can drive the HE-6, but only to a whisper. If you want to drive this bad boy, it'll take power transistors not opamps. Jung multi-loop is about circuit feedback not power dissipation, the demands of the HE-6 are far too much for opamps and a small battery.

post #858 of 930
Dilemma between Theorem or M8. I used sensitive iem and orthos.
post #859 of 930
Quote:
Originally Posted by StanD View Post
 

Perhaps it can drive the HE-6, but only to a whisper. If you want to drive this bad boy, it'll take power transistors not opamps. Jung multi-loop is about circuit feedback not power dissipation, the demands of the HE-6 are far too much for opamps and a small battery.


Not according to these guys.

 

http://www.headfonia.com/possibly-the-best-the-627/2/

 

It's a lot more than a whisper.

post #860 of 930
Quote:
Originally Posted by StanD View Post
 

Perhaps it can drive the HE-6, but only to a whisper. If you want to drive this bad boy, it'll take power transistors not opamps. Jung multi-loop is about circuit feedback not power dissipation, the demands of the HE-6 are far too much for opamps and a small battery.

 

 

Quote:
Originally Posted by headwhacker View Post
 


Not according to these guys.

 

http://www.headfonia.com/possibly-the-best-the-627/2/

 

It's a lot more than a whisper.

Not happening. Not everything one reads is true. Forgive my humor but I'd sooner see a Volkswagen Beetle pulling a Saturn V rocket booster to the launch pad.:D 

post #861 of 930
Quote:
Originally Posted by StanD View Post
 

 

 

Not happening. Not everything one reads is true. Forgive my humor but I'd sooner see a Volkswagen Beetle pulling a Saturn V rocket booster to the launch pad.:D 

 

To be honest I would like to try that myself out of curiousity. But certainly won't get the portaphile if I got the HE-6 just because I read that article.

post #862 of 930
Quote:
Originally Posted by headwhacker View Post
 

 

To be honest I would like to try that myself out of curiousity. But certainly won't get the portaphile if I got the HE-6 just because I read that article.

That's sensible. So when are you getting that pair of HE-6's? :wink_face:

post #863 of 930
Quote:
Originally Posted by headwhacker View Post
 

 

It will still dependent on the phone you are using. IEMS I'm pretty sure won't have a problem. I guess at least 90% of the headphones out there won't have a problem with the UHA-6SMKII.

 

Heck the portaphile 627 can even drive HE-6 using only a single 3.7V power supply. I'm not familiar with the amp design used (Jung multi-loop) but based on the power supply, I can't imagine that amp can provide more than 7 (-/+ 3.7) volts swing to a load.


The Portaphile 627 uses a voltage booster to get over 18Vs to the opamps, 3 x OPA627s (L, R, & G) plus two BUF634s per channel (for a total of 6) to provide enough current for current hungry headphones.

post #864 of 930
Quote:
Originally Posted by Pappucho View Post
 


The Portaphile 627 uses a voltage booster to get over 18Vs to the opamps, 3 x OPA627s (L, R, & G) plus two BUF634s per channel (for a total of 6) to provide enough current for current hungry headphones.

18V isn't all that much since opamps usually can't hit the rails, +/- 15V would be nicer. Since the ground channel has to supply current for left and right it carries double the load.......OK, I just checked the spec sheet for the BUF634 and it's 250mA, since it has a common ground channel they are basically splitting the two BUF634's 500ma total in half which is just 250 mA per channel, sounds like a shortcut to me. That may be enough for an HE-500 but not for an HE-6. I noticed that the product page gives no specs, that always makes me feel suspicious.

Edit: And for a portable, the 4 hour battery life isn't anything to write home about.

Edit 2: Just to clarify, the common ground channel means that its current is split between the demands of both left and right channels.


Edited by StanD - 1/25/14 at 10:39pm
post #865 of 930
Thread Starter 
Quote:
Originally Posted by StanD View Post
 

 

 

Not happening. Not everything one reads is true. Forgive my humor but I'd sooner see a Volkswagen Beetle pulling a Saturn V rocket booster to the launch pad.:D 

The HE-6 can be driven to deafening levels straight from the DX100. Trust me, I've tried. Have you heard the HE-6 driven by the Portaphile?

post #866 of 930
Thread Starter 
Quote:
Originally Posted by audiofreakie View Post

Dilemma between Theorem or M8. I used sensitive iem and orthos.

Sensitive IEMS? That kinda rules out the M8.
post #867 of 930
Quote:
Originally Posted by Sorensiim View Post


Sensitive IEMS? That kinda rules out the M8.


Theorem is the worst dac/amp for the sensitive iems, it hisses like mad. A bit tad lower than Alo hiss machine RXMKIII. Hifi M8, up to some level, still okay. People use it with ciems too, almost none of them reported hiss.

 

Also Centrance can mod the Hifi M8, with "iem mod", it basically reduces the gain a bit, therefore removes the hiss. Most people don't even need it apparently, at least that's what I read in the thread.

 

Theorem is another story. No one denies that it hisses like a b***h with sensitive iems. Unless you get something like SE5way, SM64, Ety ER4 stay away from Theorem.

post #868 of 930
Quote:
Originally Posted by AmberOzL View Post
 


Theorem is the worst dac/amp for the sensitive iems, it hisses like mad. A bit tad lower than Alo hiss machine RXMKIII. Hifi M8, up to some level, still okay. People use it with ciems too, almost none of them reported hiss.

 

Also Centrance can mod the Hifi M8, with "iem mod", it basically reduces the gain a bit, therefore removes the hiss. Most people don't even need it apparently, at least that's what I read in the thread.

 

Theorem is another story. No one denies that it hisses like a b***h with sensitive iems. Unless you get something like SE5way, SM64, Ety ER4 stay away from Theorem.

 

I have the M8 and I don't hear a hiss at low gain with JH16 unless you crank the volume all the way up which is pointless. You won't be able to do that because it will be very loud when music is playing. At 12 to 3 o'clock position I certainly don't hear any hiss.

post #869 of 930
Quote:
Originally Posted by headwhacker View Post
 

 

I have the M8 and I don't hear a hiss at low gain with JH16 unless you crank the volume all the way up which is pointless. You won't be able to do that because it will be very loud when music is playing. At 12 to 3 o'clock position I certainly don't hear any hiss.


Yup, so M8 is way to go :D It is a great all rounder, too bad Mr Goodman doesn't make one with coax input option, I am not gonna buy it. I will go for Chord Hugo but it will take time because of my wallet.

post #870 of 930
Quote:
Originally Posted by Sorensiim View Post
 

The HE-6 can be driven to deafening levels straight from the DX100. Trust me, I've tried. Have you heard the HE-6 driven by the Portaphile?

Haven't heard the Portaphile, but I have heard the HE-6 and I doubt that deafening levels can be achieved with this amp. Perhaps your ears are more sensitive than mine. I'll bet that at full power the batteries will go kaput very quickly. Sharing one channel for a virtual ground is IMO a serious flaw. It will lead to clipping and increased distortion on certain volume peaks/transients when under more difficult driving conditions.

My Asgard 2 can drive my HE-500's to 1 Watt which requires almost 6.2 Amps which is far more than the 250 mA that the Portaphile can truly deliver (due to the common ground channel). The HE-6 will require 7 Amps at 1 Watt. Supplying 250 mA can be loud with the Portaphile/HE-6's but with no headroom so I would expect distortion when listening loud, especially TIM and grungy bass on peaks.

Bad calculations. Redux, looks like 250 mA at 50 Ohms cranks out 3.125 W which isn't so shabby, however, HE-6 pundits claim that it needs an amp that can kick out much more. Should be good for an HE-500. I hope those chips have some sort of heatsink attached.


Edited by StanD - 1/26/14 at 12:48pm
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