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Old 14th January 2010, 06:54 PM   #2341
SQLGuy is offline SQLGuy  United States
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Quote:
Originally Posted by mige0 View Post
Yes, that would exactly be the right point to easily insert a pot and not compromising the benefits of stock topology!

But there is a drawback:

The two 499 Ohm resistors (plus mute) are best to be seen as the input impedance of the following stage. Also this resistors set the gain of the following stage (together with the feedback ressitor)
So you would have to simulate first to get the curve of attenuation or use a pot thats resistance is pretty low compared to the 2x499Ohm (which is not really feasible)

Michael
Not sure I understand that. If you disconnect/remove the stage following, you have a 499 Ohm resistor cap-coupled off the previous op amp and driving into a 100K Ohm pot. For unbalanced home use, you don't need the gain of the following stage. 499 Ohm in series with 100K Ohm should be unnoticable and also consistent, as the buffer input after the pot will be very high Z. The only thing the 499 Ohm should do is be a load for when the mute transistor is on.

Am I missing something here?

Thanks,
Paul
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Old 14th January 2010, 07:01 PM   #2342
mige0 is offline mige0  Austria
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...sure - I didn't think about replacing the following stage...
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Old 14th January 2010, 08:35 PM   #2343
sendler is offline sendler  United States
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Default Single ended

Quote:
Originally Posted by mige0 View Post
Are you going asymmetric to your amps ?
All of my amps except the BPA100 are not bridged/ balanced so unless I need to run 20 meter interconnects some day, balanced is not needed. The BPA100 can take full advantage of a balanced source but doesn't sound quite as good as the modified Sure 2X100 so I won't bother any more with BPA chip amps.
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Old 14th January 2010, 08:43 PM   #2344
mige0 is offline mige0  Austria
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Yes - "everything goes" in audio - but sadly not always

Just as a remark - balanced isn't exactly to be recommended with long lines *only* - see my rambling about doing balanced signal transfer within a a single piece of gear.

It all depends on radiating environment *and* the difference of mass potentials.

Seems you are a lucky guy in both respects...
Stay clear about bridged (and complimentary) versus floating balanced tho


Michael

Last edited by mige0; 14th January 2010 at 08:59 PM.
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Old 14th January 2010, 09:23 PM   #2345
SQLGuy is offline SQLGuy  United States
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I know what you mean. I added balanced inputs to my PS Audio 200c to help reduce ground loop noise in my multi-amped environment. It helped a lot.
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Old 15th January 2010, 03:10 AM   #2346
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Wow! Lots of things I want to comment on, but don't have time today.

Quick question. Does anyone know of a vendor that is selling the AKM4395 DAC chips? I'd like to get a few to try out in place of the AKM4393.

Gary
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Old 15th January 2010, 03:15 AM   #2347
SQLGuy is offline SQLGuy  United States
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I got my 4396's from Nu Horizons: Nu Horizons Electronics Corp. - Electronic Components Distributor.

Not sure how long it would take them to get 4395's, though, as they're not regularly stocked. The 4396's are.

Last edited by SQLGuy; 15th January 2010 at 03:18 AM. Reason: typo
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Old 15th January 2010, 03:35 AM   #2348
AR2 is offline AR2  United States
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Quote:
Originally Posted by sendler View Post
All of my amps except the BPA100 are not bridged/ balanced so unless I need to run 20 meter interconnects some day, balanced is not needed. The BPA100 can take full advantage of a balanced source but doesn't sound quite as good as the modified Sure 2X100 so I won't bother any more with BPA chip amps.
I woud say stay balanced any time you can. Single ended is there just because it is cheaper not because its better. It has no advantage just disadvantage vs. balanced.
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Old 15th January 2010, 04:38 AM   #2349
sendler is offline sendler  United States
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Default I have plenty AK4395

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Originally Posted by Gary P View Post
Wow! Lots of things I want to comment on, but don't have time today.

Quick question. Does anyone know of a vendor that is selling the AKM4395 DAC chips? I'd like to get a few to try out in place of the AKM4393.

Gary
They are sold in quantity from Nu Horizons or I can sell small quantities.
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Old 15th January 2010, 04:48 AM   #2350
SQLGuy is offline SQLGuy  United States
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Note that the minimum quanitities from Nu Horizons are not that high though. I ordered 12 4396's, which came to about $54 with shipping. Of course, you only need three of them for a DCX....

IIRC, I could have ordered less, but since the shipping was about the price of 6 DAC's, regardless, I figured I'd get a few extra.
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