Zaubertuba
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Responding to a post I made in the opamp thread about my "quest for greater soundstage," murrays pointed out the following:
Quote:
I realized my amp is already wired so L+ and L- utilize a set of opamps and R+ and R- use the other set, so there really isn't a lot of chance for crosstalk within the opamps themselves. This leaves the power supply. Currently, I'm using a 25v Switching PSU feeding a TLE2426/BUF634 rail-splitter:
(once again, excuse the cameraphone pics...and yes, I'm probably going to rewire this to get rid of the "rat's nest"
)
Would implementing a second identical TLE2426/BUF634 splitter (I would then use one per channel) help, or is there a better implementation (like the regulation and bypassing that murrays suggests) towards decoupling the power rails for each channel? Or will it even matter?
Incidentally, the amp actually sounds really good to my ears. I just can't help tweaking it that extra 1%.
Quote:
Originally Posted by murrays There are more subtle issues than just the quoted "separation" of a dual device. (See if you can track down Walt Jung's articles on audio op-amps). There are many paths that act as inputs and can couple signals. The power supply is a common one. A dual device must share its power supply - that is one thing you cannot split. So you must do the best you can with regulation and bypassing. Any ripple or noise imposed on a power rail by one half can affect the other half. Another subtle coupling path is thermal effects. Also there is layout, as mentioned by Tangent. If you decide to replace a dual device with two singles you will not reap full benefit unless you can also implement independent power supplies. That can be done with local regulators near each op amp. The best / most extreme separation is to go full "dual mono" - two independent mono amplifiers with nothing shared (well, maybe the transformer). |
I realized my amp is already wired so L+ and L- utilize a set of opamps and R+ and R- use the other set, so there really isn't a lot of chance for crosstalk within the opamps themselves. This leaves the power supply. Currently, I'm using a 25v Switching PSU feeding a TLE2426/BUF634 rail-splitter:
(once again, excuse the cameraphone pics...and yes, I'm probably going to rewire this to get rid of the "rat's nest"
Would implementing a second identical TLE2426/BUF634 splitter (I would then use one per channel) help, or is there a better implementation (like the regulation and bypassing that murrays suggests) towards decoupling the power rails for each channel? Or will it even matter?
Incidentally, the amp actually sounds really good to my ears. I just can't help tweaking it that extra 1%.