Arny Krueger wrote:

"Chronic Philharmonic" wrote

Could it be cost?

In many cases, the difrerence was pennies.

One OEM supplier upgraded us from 4560s to 4580s for free because then they
could get better bulk discounts. Never forget that !


If the volume is extremely high, then pennies can matter, but very little pro
audio equipment is built in that kind of volume.

Uh ? Depends what you call pro. This is 'semi-pro'.
http://cgi.ebay.co.uk/Studiomaster-C...QQcmdZViewItem

And used around 25-30 op-amps (4560s). It came in smaller sizes too and we sold
over 100,000 of them.

That must be getting on for 2 million 4560s taking the various channel sizes
into account.


Or stability problems that went
away by subbing a part without the need to rev the PCB?

In some cases using techno-snob parts can force you from a single-layer
board to a multi-layer board, and that involves more than just a few
pennies.

Not really with audio op-amps.

Graham