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Dirk Bruere at NeoPax
Guest
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 Posted: Thu Apr 05, 2007 2:32 pm Post subject: X-Meridian opamp replacement |
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The Auzentech card is shipped with socketed dual opamps on the
outputs, S4580P
The spec seems pretty average and subjectively a bit of top end seems
missing compared to the X-Fi. Whether the X-Fi had too much to start
with is another question...
Anyway, suggested replacements, assuming replacements are necessary at
all?
The 5532 has better slew rate, although I'm not sure about the noise
because the data sheet for the S4580P simply says: 0.8 uV RMS, RIAA
Rs=2k2, f=30kHz LPF
Bandwidth = 15MHz
Dirk |
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GregS
Guest
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| Posted: Thu Apr 05, 2007 2:32 pm Post subject: Re: X-Meridian opamp replacement |
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In article <1175779282.602289.301570@o5g2000hsb.googlegroups.com>, "Dirk Bruere at NeoPax" <dirk.bruere@gmail.com> wrote:
| Quote: | The Auzentech card is shipped with socketed dual opamps on the
outputs, S4580P
The spec seems pretty average and subjectively a bit of top end seems
missing compared to the X-Fi. Whether the X-Fi had too much to start
with is another question...
Anyway, suggested replacements, assuming replacements are necessary at
all?
The 5532 has better slew rate, although I'm not sure about the noise
because the data sheet for the S4580P simply says: 0.8 uV RMS, RIAA
Rs=2k2, f=30kHz LPF
Bandwidth = 15MHz
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I don't know if the package is the same, but you might take a look at
LM4562
http://cache.national.com/ds/LM/LM4562.pdf
greg |
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Dirk Bruere at NeoPax
Guest
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| Posted: Thu Apr 05, 2007 2:32 pm Post subject: Re: X-Meridian opamp replacement |
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On 5 Apr, 14:35, szeke...@pitt.edu (GregS) wrote:
| Quote: | In article <1175779282.602289.301...@o5g2000hsb.googlegroups.com>, "Dirk Bruere at NeoPax" <dirk.bru...@gmail.com> wrote:
The Auzentech card is shipped with socketed dual opamps on the
outputs, S4580P
The spec seems pretty average and subjectively a bit of top end seems
missing compared to the X-Fi. Whether the X-Fi had too much to start
with is another question...
Anyway, suggested replacements, assuming replacements are necessary at
all?
The 5532 has better slew rate, although I'm not sure about the noise
because the data sheet for the S4580P simply says: 0.8 uV RMS, RIAA
Rs=2k2, f=30kHz LPF
Bandwidth = 15MHz
I don't know if the package is the same, but you might take a look at
LM4562http://cache.national.com/ds/LM/LM4562.pdf
greg
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That looks well impressive.
Thanks
Dirk |
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Peter Larsen
Guest
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| Posted: Sat Apr 14, 2007 10:05 am Post subject: Re: X-Meridian opamp replacement |
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Dirk Bruere at NeoPax wrote:
| Quote: | However, I suppose my original question was whether there is any
audible effects when the slew rate limit is well into the
ultrasonics.
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Yes, I encountered one opamp sounding plain boring when under RF stress.
Kind regards
Peter Larsen |
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Peter Larsen
Guest
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| Posted: Sat Apr 14, 2007 10:14 am Post subject: Re: X-Meridian opamp replacement |
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Eeyore wrote:
| Quote: | Dirk Bruere at NeoPax wrote:
The Auzentech card is shipped with socketed dual opamps on the
outputs, S4580P
The spec seems pretty average
Not at all. 4580s are a lot better than average.
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They don't do really bad things. I did find a circuit using them boring,
and vastly improved after an opamp replacement.
| Quote: | It certainly won't be due to the 4580 !
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On the probabilities here we disagree.
| Quote: | The 4580 is easily the equal of the 5532.
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It could go either way, I have heard thingies with 553x being harsh or
being forward. I do not know why, but I recall that 553x comes in many
brands, makes and flavors.
| Quote: | Better in fact. Notably
distortion.
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You may recall my modded DAT, Preben Friis's measurements suggested that
distortion was lower before the opamp replacement, much to my surprise
since it got so much cleaner by being modded, but it must be included
that coupling cap issues also were addressed.
Kind regards
Peter Larsen |
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Peter Larsen
Guest
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| Posted: Sat Apr 14, 2007 10:34 am Post subject: Re: X-Meridian opamp replacement |
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Dirk Bruere at NeoPax wrote:
| Quote: | The Auzentech card is shipped with socketed dual opamps on the
outputs, S4580P
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socketed, that is nice, complete url to the manufacturer?
| Quote: | The spec seems pretty average and subjectively a bit of top
end seems missing compared to the X-Fi.
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Hmmm ....
| Quote: | Whether the X-Fi had too much to start
with is another question...
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I have not heard that specific product.
| Quote: | Anyway, suggested replacements, assuming replacements
are necessary at all?
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What is the context of the sound card?
| Quote: | The 5532 has better slew rate, although I'm not sure
about the noise because the data sheet for the S4580P
simply says: 0.8 uV RMS, RIAA
Rs=2k2, f=30kHz LPF
Bandwidth = 15MHz
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Analog Devices OPA(?) 275 comes to mind as very well sounding and very
well behaved. Burr Brown 2134 has a charming midrange and is also a nice
upgrading tool to work with, but slmewhat more prone to turn-on(/turn
off thumps. Burr Brown X604 seems to have superior extremes of the audio
range, but can come across as bright.
NOTE however that effects of unbiased couplling caps can cloud the issue
and that very much audio has passed fantazillions of "industry standard"
components prior to reaching your playback system. Which is to say that
modding may be irrelevant, I would actively discourage it as an
unsuitable risk vs. possible benefit if not for the socketing of the
original IC's
Industry standard components DO tend to be those that pass approval in
tech deparment AND in finance department, the latter departments tend to
do their dollar math in 0.000000000001 cent increments.
All evaluations above are subjective and in one context where distortion
measurement was made the meausured distortion of the modded apparatus
increased by modding rather than decreasing, it also sounded very much
better, but specs were against the mod and showed that the original
component choice was very sane.
Kind regards
Peter Larsen |
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Eeyore
Guest
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| Posted: Sat Apr 14, 2007 1:53 pm Post subject: Re: X-Meridian opamp replacement |
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Peter Larsen wrote:
| Quote: | Eeyore wrote:
Dirk Bruere at NeoPax wrote:
The Auzentech card is shipped with socketed dual opamps on the
outputs, S4580P
The spec seems pretty average
Not at all. 4580s are a lot better than average.
They don't do really bad things. I did find a circuit using them boring,
and vastly improved after an opamp replacement.
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Using what kind of replacement ?
| Quote: | It certainly won't be due to the 4580 !
On the probabilities here we disagree.
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Tell me more.
| Quote: | The 4580 is easily the equal of the 5532.
It could go either way, I have heard thingies with 553x being harsh or
being forward. I do not know why, but I recall that 553x comes in many
brands, makes and flavors.
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That is true. I recall such comments being made in the late 70s early 80s. The
chip design may have altered ( only Philips/Signetics made it then and Philips
no longer make it btw ) as may the circuits it's used in.
| Quote: | Better in fact. Notably > distortion.
You may recall my modded DAT,
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I'm not familiar with that actually.
| Quote: | Preben Friis's measurements suggested that
distortion was lower before the opamp replacement, much to my surprise
since it got so much cleaner by being modded, but it must be included
that coupling cap issues also were addressed.
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The coupling cap. Was that a small value zero bias electrolytic ? That makes
some sense.
Graham |
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