Burr Brown OPA227 and OPA134, audible difference? - diyAudio
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Old 27th July 2007, 05:20 PM   #1
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Default Burr Brown OPA227 and OPA134, audible difference?

is there any?
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Old 27th July 2007, 08:29 PM   #2
(>'-')> is offline (>'-')>  United States
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Very big difference, the 2132/2134 has a more balanced sound while the 2227 is more bloated and has an awful midrange.
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Old 31st July 2007, 11:57 AM   #3
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Don't ask subjective questions, and you won't get inflated subjective answers.

You need to try it out for yourself, and decide for yourself.
The 227 is used in a great many diy projects, so if what "whats-his-name" said above were true, he has magic ears that the rest of the diy community does not.

His blanket statement is bloated, and awful.

And neither of you included what circuit(s) said chips were being used for.

=RR=
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Old 14th June 2008, 01:01 AM   #4
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Old 14th June 2008, 11:11 AM   #5
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Very big difference, the 2132/2134 has a more balanced sound while the 2227 is more bloated and has an awful midrange.
I had the opposite experience. opa2134/2 were harsh and tubby while the 2227 sounded balanced. This was in a preamp.
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Old 14th June 2008, 04:55 PM   #6
jcx is offline jcx  United States
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in a Iout DAC I/V circuit there is an engineering case for preferring a fet input op amp

fet inputs can accept the fast steps and "glitch" energy of the DAC output with less input stage distortion compared to a similar GBW op amp with a hi gm bipolar input

but circuit topolgy can make a difference too - put a discrete or CFA buffer in the I/V loop on the output of the op amp to give low impedance at high frequencies and the feedback cap implementing the 1st pole of the reconstruction filter then "soaks up" some of the DAC's switching/glitch energy at frequencies where a single "audio" op amp's output impedance is high

the 227 has lower Vnoise and could be better in analog preamp stages where the signal doesn't have the high frequency steps of the DAC output

in spite of the above reasoning many DAC data sheet reference circuits use the bjt input 5534 in the I/V circuit with excellent measured performance #, so its the hardly the case that differences have to be "obvious" to the ear either
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Old 14th June 2008, 11:03 PM   #7
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allthough no rigorus testing done.. I remember the opa134 as being slight harsch too.. and the opa227 has been my favortite for some time now...
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