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Old 18th April 2006, 09:22 PM   #1
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Default Influence of RIAA impedance value on sound

I'm going to build RIAA preamp. Do you think that RIAA EQ impedance value influence on sound or perhaps you have got any expirience?
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Old 18th April 2006, 09:27 PM   #2
ingrast is offline ingrast  Uruguay
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Default Re: Inflence RIAA impedance value on soundu

If you are talking about eq. input impedance, and your eq. is active, you have to make sure it matches the pickup specified load, usually 47 K.

Rodolfo
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Old 18th April 2006, 09:41 PM   #3
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I haven't meant input impedance, but RIAA EQ circuit impedance.
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Old 19th April 2006, 12:25 PM   #4
ingrast is offline ingrast  Uruguay
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Right, I meant RIAA equalizer input impedance (as seen from the pickup as a load). Above said holds.

Rodolfo
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Old 19th April 2006, 12:40 PM   #5
phn is offline phn  Sweden
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Speaking as a non-engineer, I think impedance should make a difference just as the choice of values (low or high) for the caps and resistors in the RIAA network will.

You could try them thar low-impedance SMTs

Everywhere an engineer looks he sees objects. He sees problems to be solved. Don't. See it as options.
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Old 19th April 2006, 12:54 PM   #6
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by phn
Everywhere an engineer looks he sees objects. He sees problems to be solved. Don't. See it as options.
No, no. We see them as "options" to be optimised.

Broadly speaking, a lower impedance RIAA network will be lower noise but its loading may cause the driving stage to distort more and any stage that sinks grid current into it to distort less.

Ultimately, the impedance of the RIAA network is determined by the capacitor (or inductor) values available in the designer's parts bin.
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Old 19th April 2006, 01:04 PM   #7
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Quote:
Originally posted by phn
Everywhere an engineer looks he sees objects. He sees problems to be solved. Don't. See it as options.
I would use the word "properties" instead of problems.
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Old 19th April 2006, 01:08 PM   #8
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Default Re: Inflence RIAA impedance value on soundu

Quote:
Originally posted by Uchi Deshi
I'm going to build RIAA preamp. Do you think that RIAA EQ impedance value influence on sound or perhaps you have got any expirience?
Possibly yes but first you must deside how the topology of the correction should look like.

1 non-inverting, active correction (feedback), most common

2 non-inverting, two stages and passive correction

3 non-inverting preamp and inverting active correction.

4 multiple stage correction

When you have desided which type you are going to use you also know in which value range you can build the RIAA correction network of.

Check Walt Jung, page 6.14, good stuff about RIAA amps.
http://www.analog.com/library/analog...h6_final_I.pdf
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Old 19th April 2006, 03:08 PM   #9
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I have three words for you engineers:

Yeah, yeah, yeah
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