Re: expert modified the A/D signal chain (OT)

[Matthias Grob <matthias@grob.org>]

>  > andy said:
>> 
>>   >If you can buy it as a stand alone I assume that means its some kind 
>of
>>   >impedance matching interface.
>> 
>matthias said
>>   does not makes sense to me.
>> 
>
>If it's standalone it must be  a separate  device, outside of the effect 
>to
>be improved.
>Therefore any signal must still be going through the input and output
>circuitry of the effect.
>So you can't improve the sound unless the original problem was caused by 
>the
>interaction of the effect and whatever was before, and/or after, in the
>signal chain.
>In which case the circuits in the signal chain are interacting, which has 
>to
>be down to impedance.
>So you use the 'standalone' device as a buffer to stop the interaction. 
>This
>would have it's impedance designed to make an ideal match.
>
>makes sense to me
>
>........could still be wrong though:-)

Impedance matching only makes sense for high frequency (digital, 
RF...) or veeery long cables. For audio in general its enough that 
the input is of higher impedance that the output and thats easily 
given with any equipment of the last few decades (usually 600 Ohm out 
/ 20k..1M in, the Echoplex has 2M Ohm in for piezo)
-- 


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