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Old 21st April 2010, 11:40 PM   #491
ichiban is offline ichiban  United States
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Quote:
Originally Posted by Javin5 View Post
I think it's wonderful that we can experience the sound quality of the ESS 9018 at a much more affordable price thanks to the efforts of TPA. Thanks again, Russ and Brian!


AMEN!!!
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Old 22nd April 2010, 12:09 AM   #492
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Thanks!!

And on that note, Buffalo pre-orders open up again this Saturday at 8pm Eastern Time (US).

There will be more available every two weeks.
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Old 22nd April 2010, 06:29 AM   #493
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Question on usage... I'm waiting for the pre-order to open and have a question on usage.
I'd like to go for a dual mono setup with only a spdif input and I/V with a Sowter transfomer. No volume control as it will be used in a controll preamp (lo mu tube)and multiple input select before the amplifiers.
Wasn't quite sure after reading the pdf users manual... Will I need two complete Buff2's?
A block diagram with the different configurations possible would be nice to refer to.
Thanks!

Jeff Davison
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Old 22nd April 2010, 02:25 PM   #494
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by yammy1688 View Post
http://www.twistedpearaudio.com/foru...rce.ashx?a=187

There's a link to a PDF for dual-mono setup.
Please stop referencing a wrong wiring schematic.
As I posted before, the diagram was already corrected by Russ.

Quote:
Originally Posted by Bunpei View Post
I have a primitive question on the schematic for a "Dual Mono B-II and IVY-III" that Brain had released on TPA Support Forum before. ( Those who configure a "Dual Mono mode" must ignore the output stage wiring given on the schematic. They must reference Russ's schematic shown on this thread before instead.
Buffalo II
Russ's schematic contains a correct output wiring with no phase inversion.
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Old 22nd April 2010, 02:57 PM   #495
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Quote:
Originally Posted by Bunpei View Post
Please stop referencing a wrong wiring schematic.
As I posted before, the diagram was already corrected by Russ.
In that schematic should not one the R_In - on the top ( associated with left) of each IV board be L_IN -?

Thanks

Bob
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Old 22nd April 2010, 09:23 PM   #496
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Quote:
Originally Posted by Russ White View Post
This is the correct way to wire a Dual mono Buffalo II.

The important thing to remember is simply that the phase of the opposite side of the DAC than is selected is reversed.

This makes wiring simple when using IVY_III or Legato.

Cheers!
Russ
Russ:

I wasn't questioning the correctness. I just don't see a L_In - on the IVY section of the schematic. I see 2 R_IN - pts.

Best

Bob
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Old 22nd April 2010, 10:35 PM   #497
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Ah yes, that's simply a typo. I will fix that.
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Old 22nd April 2010, 10:48 PM   #498
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Ok here is the wiring diagram for dual mono with the typo corrected at the IVY left input.

Thanks for pointing that out so it could be fixed. Asside from the typo, the diagram was otherwise correct.
Attached Files
File Type: pdf buf II with IVY dual mono.pdf (30.5 KB, 349 views)
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Old 23rd April 2010, 03:30 PM   #499
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Dear Russ:

I think I understand why the ESS9018 wants to "see" zero impedance,
but then we also have 0 Vac output voltage, right? How does one then
measure THD (-120 dB)?


Regards,

Quote:
Originally Posted by Russ White View Post
Using just one phase of the DAC output negates much of the advantage of the chip and will result in higher distortion than you would get using the DAC as intended which is balanced.

I am not saying this should or will be important to everyone, it's just a fact.

Of course the lower you make the output voltage swing by reducing the resistor value the less distortion you will have, but also you now have pretty bad dynamic range, so it's a trade off.

The DAC is simply a voltage source with a 195R impedance. It is not a classical current source. Any resistor after it simply forms a voltage divider.

This is why a low impedance (less than an ohm) differential input output stage is a must for getting the most out of the chip. For those of you who don't like opamps, the zero feedback Legato is almost here.

Cheers!
Russ
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Old 23rd April 2010, 03:35 PM   #500
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THD+N at digital full scale for the ESS9018 is:

-108 dB when in differential voltage mode
-120 dB when in differential current mode

- indeed mpressive numbers.

But has anyone measured THD from the IVY3?



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