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REVIEW: Ray Samuels Audio Dark Star solid state headphone amplifier - Page 14

post #196 of 372

Quote:
Originally Posted by TheWuss View Post

What I suppose I mean is that the man has answered the inquiries about his amp design.


No he hasn't. Telling us how deeply the amp is biased into Class A is a simple question, with a simple answer.

 

Quote:
Originally Posted by musicman59 View Post

What really matters the most to us as audiophiles? Just the design or the actual enjoyment of the sound?
 

 

How about both?


Edited by Beefy - 2/3/12 at 8:00am
post #197 of 372

Not to me. I put value on what gives me staifaction which in this case is the actual sound. I will not buy an amp for its design but for its sound. I rather buy an amp that is class A/B or even D if it sounds better than a pure class A. What matters to me is the sound not the topology of the desing but that is just to me.

post #198 of 372
Quote:
Originally Posted by Pars View Post

^ which part of 25mA bias, 63mW into 50 ohms before switching out of Class A didn't you understand? And the 25mA is the MAX value from the datasheet... 20mA is TYPICAL.



i'm a lay person.  so you'll have to help me out.

 

at 83 dB / mW, for the record, how loud can one get with the HE-6 before exhausting the theoretical 63mW ?

 

 

 

 

 

post #199 of 372

63mw into 50ohms isn't a huge amount of power (if that is the correct figure, didn't check).

 

Max SPL (assuming you are playing digital files through your DAC which peak at 0dbfs) would be just over 100db (given by (thanks NwAvGuy!) sensitivity in dB/mW + 10 * LOG ( Pmax in mW))

 

It dropping out of Class A in normal operation is hence not particularly likely for normal-level listening, but certainly feasible (dependent on content and listening level).

 

 


Edited by Willakan - 2/3/12 at 9:04am
post #200 of 372
Quote:
Originally Posted by Beefy View Post

 

 

How about both?



^Win. 

post #201 of 372

Quote:

Originally Posted by The Monkey View Post

^Win. 


Righteously succinct. 

 

Good to see you on here! Maybe we do different threads.

post #202 of 372
Thank you willaken. I think that makes sense.
post #203 of 372

The HE-6 Tyll got his hands on was only about 77dB/mW with an impedance of 53 ohms.  63mW into that one is only about 95dB SPL.

 

EDIT:  Calculator for the lazy like me...


Edited by maverickronin - 2/3/12 at 9:51am
post #204 of 372
Quote:
Originally Posted by maverickronin View Post

The HE-6 Tyll got his hands on was only about 77dB/mW with an impedance of 53 ohms.  63mW into that one is only about 95dB SPL.

 

EDIT:  Calculator for the lazy like me...



I guess there is some variablility in the HE-6 drivers. My pair measured 49 ohms each side but the one from a friend of mine just measured 37.5 ohms on each side. I am actually wondering is they put HE-500 drivers in his HE-6 since the spec of the HE-500 is 38 ohms.

 

 

post #205 of 372
Quote:
Originally Posted by Willakan View Post

63mw into 50ohms isn't a huge amount of power (if that is the correct figure, didn't check).

 

Max SPL (assuming you are playing digital files through your DAC which peak at 0dbfs) would be just over 100db (given by (thanks NwAvGuy!) sensitivity in dB/mW + 10 * LOG ( Pmax in mW))

 

It dropping out of Class A in normal operation is hence not particularly likely for normal-level listening, but certainly feasible (dependent on content and listening level).

 

 


almost forgot to ask - isn't there more than one opamp per channel in the dark star?

does that figure into the calculation?


 

 

post #206 of 372

 

Quote:
Originally Posted by TheWuss View Post

almost forgot to ask - isn't there more than one opamp per channel in the dark star?

does that figure into the calculation?

 

 

Are the amps bridged or paralled? Assuming the former, then not for current, no. The maximum current draw before dropping out of Class A is the same whether single ended or bridged.

 

In this case, bridging doubles the voltage swing only.

post #207 of 372

Quote:

Originally Posted by maverickronin View Post

EDIT:  Calculator for the lazy like me...


Cool link, thanks for posting it.

post #208 of 372
Quote:
Originally Posted by musicman59 View Post



I guess there is some variablility in the HE-6 drivers. My pair measured 49 ohms each side but the one from a friend of mine just measured 37.5 ohms on each side. I am actually wondering is they put HE-500 drivers in his HE-6 since the spec of the HE-500 is 38 ohms.

 

 



Hi Jose. I'm almost certain this isn't the case. I owned two HE500s and compared them with the two HE6s side by side. The sound is much too different. The chassis is nearly identical in every parameter so the difference must come from the drivers. Also, the drivers look different once you take off the earpads.

 

I can't imagine Fang and co. pulling a move like that...and even if they did, your friend would notice the difference if he had previously heard the HE6.


Edited by Shahrose - 2/3/12 at 12:11pm
post #209 of 372

I did not know that the HE-500 divers look different and he confirmed his look like the HE-6 not the HE-500. It is just carzy to have 23% variability in ohms from pair to pair.

post #210 of 372

I just measured the impedence of my HE500 it is 52.2 and 51.8 ohms.  Much closer to the 50 ohms of the HE6 than the 38 ohms of the HE500 spec.  I wonder if they are now using the same base driver, just slightly tweak between each model.

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