As to the sound of different chips, I'm rather with Arnie on this one.
If the design is reasonably sound, and you get low distortion and noise,
then I don't think there would be any audible difference.

The LM4562's boast 20v/uS slew rate, the 5532's a measly 6v/uS ,
google for lm4652 and there are a few people saying same as me, there's more
detail and bass drums stand out amongst bass lines, I'm convinced they
didn't before, I guess I should put the 5532's back in but that's too much
messing and I have other fish to fry.........

I too would avoid 741's and LF351's too that seem to keep appearing...

Pete

"Pete Cross" wrote in message

As to the sound of different chips, I'm rather with
Arnie on this one. If the design is reasonably sound,
and you get low distortion and noise, then I don't think
there would be any audible difference.

The LM4562's boast 20v/uS slew rate, the 5532's a measly
6v/uS ,

So what? As long as the op amp's slew rate is far less than the slew rate of
the audio signal, no problems.

I'll leave it as an exercise for you to calculate the slew rate of a 20 KHz
wave at whatever voltage you think there is in your project's circuit.

google for lm4652 and there are a few people saying same
as me, there's more detail and bass drums stand out
amongst bass lines,

There are people who will say anything. Apparently there are people who
thought that Anna Nicole Smith was beautiful!

I'm convinced they didn't before, I
guess I should put the 5532's back in but that's too much
messing and I have other fish to fry....

That's how everybody who has avoided the obvious pitfalls of sighted
evaluations thinks - before they rip out perfectly good 5532s!

I too would avoid 741's and LF351's too that seem to keep
appearing...

It takes a lot of ignorance to compare 741s to LF 351s. There's about a
13:1 difference in slew rate, and a 741 is so slow that it could conceivably
get into trouble.

You really need to do some good double blind tests.

In article , Pete Cross wrote:
As to the sound of different chips, I'm rather with Arnie on this one.
If the design is reasonably sound, and you get low distortion and
noise, then I don't think there would be any audible difference.

The LM4562's boast 20v/uS slew rate, the 5532's a measly 6v/uS ,

Erm.. I'm not sure what kind of music you listen to, or what speakers you
are using, but if I've estimated it correctly, 6v/microsec translates into
a power bandwidth of the order of 95kHz for +/-10V waveforms. :-)

google for lm4652 and there are a few people saying same as me, there's
more detail and bass drums stand out amongst bass lines,

How many recordings of bass drums give transients approaching
6v/microsecond with peak levels of less than 10V?

I'm afraid that if you read magazines, forums, etc you will see all kinds
of 'opinions' given - often contradictory.

FWIW rather than simply comparing raw 'slew rate' values I think it would
be better to take note of the load used (as this will have an effect on
the slew rate delivered) and the level of distortion for an audible HF
test signal of a kind which could be expected to arise in real use.

Slainte,

Jim

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