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The Koss ESP950 thread (ESP owners, please contribute! :) - Page 8

post #106 of 346
10/25/07 at 4:16am
Quote:
Originally Posted by ura View Post
When I touch the right cup the static noise appear and disappear only when unplug the phones cord from amp.
How can I resolve this problem?
There is something (hair, dust etc.) touching the drivers causing them to leak. I would just send them back.
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post #107 of 346
10/26/07 at 8:32pm
Thread Starter 
any updates on the E9 zener voltage, yet?

also, how big are the transformers in the E9? (the iron core dimensions?)
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post #108 of 346
10/26/07 at 8:39pm
Thread Starter 
and if possible, can anybody provide the iron core dimension of the ESP6 transformers?

Thanks
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post #109 of 346
10/26/07 at 8:41pm
Quote:
Originally Posted by AudioCats View Post
any updates on the E9 zener voltage, yet?

also, how big are the transformers in the E9? (the iron core dimensions?)
I can't find my /E.9 so no help from me but by memory the transformers were slightly bigger then the Stax SRD-6/7 units.
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post #110 of 346
10/26/07 at 8:53pm
Thread Starter 
hmmm,,, then how big is a SRD6/7 trans (iron core)?
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post #111 of 346
10/26/07 at 9:02pm
Quote:
Originally Posted by AudioCats View Post
hmmm,,, then how big is a SRD6/7 trans (iron core)?
4.5cm by 5.5cm and the EI stack is 2cm thick.

The ESP6 trafos are tiny so about 2cm square.
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post #112 of 346
10/26/07 at 10:55pm
Thread Starter 
The ESP6 trans are that small? lets put them in a portable.....

How big are the ones in a SRM-x?





.
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post #113 of 346
10/27/07 at 11:24am
Thread Starter 
This sentence is from the E90 spec (koss manual):
*Audio output voltage: 600 Vrms differential, 2300 Vrms push-pull with soft limiting

what exactly are the "differential" and "push-pull" here? Is "push-pull" the bridge mode? So you can actually do bridge mode with the E90? 2300V is enough to drive ESL's.....
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post #114 of 346
10/27/07 at 1:15pm
Quote:
Originally Posted by AudioCats View Post
The ESP6 trans are that small? lets put them in a portable.....

How big are the ones in a SRM-x?.
They could very well be used in a portable application coupled with some class-D amp. C'mon you know you want to...

Quote:
Originally Posted by AudioCats View Post
This sentence is from the E90 spec (koss manual):
*Audio output voltage: 600 Vrms differential, 2300 Vrms push-pull with soft limiting

what exactly are the "differential" and "push-pull" here? Is "push-pull" the bridge mode? So you can actually do bridge mode with the E90? 2300V is enough to drive ESL's.....
Well at least they are honest when they are boasting the numbers by relaxing the standards...
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post #115 of 346
10/27/07 at 1:36pm
After having run across this thread a week or so ago, it inspired me to pull my ESP/950s out of retirement and listen to them again.

Thank you all, I've been enjoying them immensely!
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post #116 of 346
10/27/07 at 3:15pm
Thread Starter 
Quote:
Originally Posted by spritzer View Post
They could very well be used in a portable application coupled with some class-D amp. C'mon you know you want to...



Well I have been asking questions about SI T-amps lately, on the amp forum...

I was thinking more like using 5VA 7V toroids (1:30, weight about 1/4 LB each), hiden in the new G-2 T-amp's battery compartment. 5VA trans coupled with 7w amp should be able to drive ESP950/Lambdas with authority.



So here comes a question for somebody (edstrelow ?) with a converted ESP950, a E90 and a pro-bias SRD-7:
How do the E90 compare with a SRD-7 pro driven by a good speaker amp? While the E90 is not as good as a SRM-3, is it better than a Stax transformer?
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post #117 of 346
10/27/07 at 3:31pm
Quote:
Originally Posted by AudioCats View Post
Well I have been asking questions about SI T-amps lately, on the amp forum...

I was thinking more like using 5VA 7V toroids (1:30, weight about 1/4 LB each), hiden in the new G-2 T-amp's battery compartment. 5VA trans coupled with 7w amp should be able to drive ESP950/Lambdas with authority.



So here comes a question for somebody (edstrelow ?) with a converted ESP950, a E90 and a pro-bias SRD-7:
How do the E90 compare with a SRD-7 pro driven by a good speaker amp? While the E90 is not as good as a SRM-3, is it better than a Stax transformer?
The SRM-3 is a horrible amp so the E90 must be awful but the transformers could be better. There are more things to consider then just the ratio for the transformers as audio ones are wound differently then mains units but you could always try it. I would just get a ESP6, convert it to the Stax standard and use the transformers to experiment with. At 40$ you get a headphone and something to play with...
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post #118 of 346
10/27/07 at 3:50pm
Thread Starter 
whoops, double post
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post #119 of 346
10/27/07 at 3:50pm
Thread Starter 
I thought in a toroid the windings are always interleaved, no? (since you don't really wind the primary and secondary seperately then assemble, like with the EI core).
I am still waiting for my 1:50 JRM transformers, but the 150VA power toroids I am using actaually don't sound too bad, I wouldn't mind having that kind of sound quality in a on-the-go package.
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post #120 of 346
10/27/07 at 5:07pm
There are some variations with the basic toroid principle but its pretty similar all but they aren't used much in this role. The main issue is the capacitance of the transformers as that will have a huge effect on the sound.
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