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Ray P
Reply with quote  #1 
I'm looking to buy some new headphones, 600ohm Beyerdynamic DT 880s, for use with a Masterpiece - anyone had experience of this pairing?

Cheers

Ray
Eric B
Reply with quote  #2 
I know they are not the same ones you were asking about but, I have used the Beyerdynamic DT 770PRO 80 OHM and they sounded the best I have ever heard them with the Masterpiece. Plenty of volume and very revealing.
Eric
Ray P
Reply with quote  #3 
Thanks Eric.

I ordered a pair of 600ohm DT880s a couple of days ago.

Ray
Carson
Reply with quote  #4 
impressions?

I've recently plugged HD650s (300ohm) back into the MP after listening to another amp for weeks; MP is truly remarkable! 

I struggle a bit to describe what I'm hearing but I can agree that this amp removes digital harshness and adds lushness to more than vinyl.
Ray P
Reply with quote  #5 
I haven't listened to the BeyerDynamics yet - my good lady decided to confiscate them so she doesn't have to go through the usual problem of what to get me for Christmas.

I just have to be patient.
SAWOLF
Reply with quote  #6 
I've been employing Bruce's prototype Masterpiece, he so generously gave me.  For power, a minibeast to drive a Stax electrostatic, SRD 7, MK III earspeaker system. I've been carrying, for over 35 years, a Deep Purple, Made in Japan, CD, one of the early releases, may only be a 14 bit transfer. It's not listenable, so harsh and the soundstage is congested and homogenized with anything I've listened through. But with the above combination, it's so amazing I just can't believe how it sounds REAL. The soundstage is so open I can almost walk through the band members jamming and the highs, extremely natural, and defined. Bass,and low organ notes, kicks behind, too. While Ian Gillan's vocals, just shine.

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Capt. Z
Reply with quote  #7 
I used to have a Stax SRD 7 with a (can't remember the model name, maybe SRX???). 

As I remember, the SRD 7 Adapter love a very powerful transistor amp, like 100 Watts and up to sound decent. I eventually sold that Stax set up, since my 30 year old Beyer DT990 was a lot more neutral in the mids and more detailed altogether. 
SAWOLF
Reply with quote  #8 
Captain, I've built the Audio Amateur published Lang Amp because Nelson Pass stated it was,' The most advanced and elegant design published..' and that included His own Audio Amateur published design.My version, featured on the cover of Issue 3, 1998. I doubled the bias current to 4 amps which delivered 80 watts, Class A, from Hitachi MOSFET  output devices and double bypassed, 330,000 mfd capacitance powersupply. Bruce's 4 Watts, is definitely FAR superior to my ears.
Allan Marcus
Reply with quote  #9 

Quote:
Originally Posted by SAWOLF
I've been employing Bruce's prototype Masterpiece, he so generously gave me.  For power, a minibeast to drive a Stax electrostatic, SRD 7, MK III earspeaker system. I've been carrying, for over 35 years, a Deep Purple, Made in Japan, CD, one of the early releases, may only be a 14 bit transfer. It's not listenable, so harsh and the soundstage is congested and homogenized with anything I've listened through. But with the above combination, it's so amazing I just can't believe how it sounds REAL. The soundstage is so open I can almost walk through the band members jamming and the highs, extremely natural, and defined. Bass,and low organ notes, kicks behind, too. While Ian Gillan's vocals, just shine.


Hi. How is the Masterpiece driving the Stax headphones? I mean, how is it connected?

Thanks,

Allan

SAWOLF
Reply with quote  #10 
The Masterpiece isn't directly driving the Energizer(SRD-7), The Pre Amp's output, is to the input of the Mini Beast. Sorry, I've had the Stax for over 40 years and assumed that it was understood, the electrostats in the photo are driven by an Amp's output into the Energizer.
Allan Marcus
Reply with quote  #11 
Quote:
Originally Posted by SAWOLF
The Masterpiece isn't directly driving the Energizer(SRD-7), The Pre Amp's output, is to the input of the Mini Beast. Sorry, I've had the Stax for over 40 years and assumed that it was understood, the electrostats in the photo are driven by an Amp's output into the Energizer.


thanks. that makes sense. 
Drew
Reply with quote  #12 
I'm wondering if anyone can comment on using 600 ohm headphones with the Masterpiece. 

Specifically I'm thinking about the Beyerdynamic DT 990s (open back).

These come in 250 and 600 ohm versions.

I wonder which would be better with the Masterpiece.  From what I read, 600-ohm headphones can sound amazing but they are power-hungry.  

Really appreciate any input on which impedence would match best with Masterpiece.  Thanks!
Drew
Reply with quote  #13 
Well, just for the record - I went ahead with the Beyer 600 ohm phones, open back, DT 990.  

I do have a few questions if anyone cares to reply.

Here's a comparison of how the Masterpiece works with 600 ohms in my case.
  • My old Sony MDR 7506s are rated at 63 ohms impedance.  9:00 or 10:00 was very loud with my Masterpiece using these Sony's.
  • The Beyer 600 ohm phones require a range of 10:00 to 2:00 on the Masterpiece volume for what I'd call normal listening levels.  They sound very nice!   I think it's driving them well and they sound beautiful. So all is good but I'm wondering if it's less than ideal to run the MP at such high relative volume levels for extended periods.
  • As another comparison, I tried the Beyer's on my NAD solid state amp which has 68 ohm headphone output impedance.  Really loud at 9:00.  10:00 is about the max without blowing your ears out.  Apples and oranges I'm sure.
I see that Masterpiece headphone output impedance is 15 ohms which is consistent with my experience.  Maybe that spec is intentionally on the low side to make the Masterpiece friendly to low impedance headphones that seem common these days for all of our low output devices.  

I recall that there are two 5.1K resistors on the MP headphone plug . . .

I suppose that's where the attenuation comes (my line-outs are very powerful; I need to check but I am thinking those two little resistors are the only difference between the headphone plug and the line outs?) 

I wonder if changing those resistors is a possibility and if it would be a good idea for high impedance phones . . . 


Kelvin Tyler
Reply with quote  #14 
Drew.
Good to hear that you are enjoying your Beyer 600ohm phone/Masterpiece combination.
In the specs for the MP I see Bruce gives: 100mW into 30ohms, 360mW into 100ohms, and 100mW into 600ohms. This pattern of first rising and then falling power output with impedance is typical for this design of output stage. The 300B tubes idle at 100mA so the max current drive is 100/root2 = 70mA rms as stated. The MP is a Class A amp. The gain of the amp is controlled by the NFB to be about 4x for high impedance loads,  falling as the load is reduced. The output stage has a limited output voltage capability before clipping and gross distortion sets in. This is about 8v rms. To get more power into a higher load requires of necessity more voltage (P=VxV/R) and therefore more drive, but here there are obvious limits.
The 5.1k resistors are present for both HP and line outputs and there is no advantage to changing them.
I see no problem with running your MP at the increased volume settings you describe.
In general, the lower the output impedance the better.
Regards,
Kelvin

Carson
Reply with quote  #15 
I learn more and more from Kelvin with each response he posts!

I’m glad to hear the tiny 100mW output drives your 600ohm cans with easy (2 o’clock). Masterpiece = end game headphone amp.
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