2. amps-preamps
  3. 131621-71023

Impedance Question?

OK so I know there's a lot of threads about matching impedance with pre/amp.  It would be really nice if someone could help out here! The whole impedance thing confuses me (doesn't take much).

So if I have an amp that has 10k impedance what range for output impedance would work for a preamp?

Any help would be great!
sqitis
toddverrone's avatar
toddverrone
840 posts
 
Wait, the answer is a number (I've yet to calculate). Is that the gain or the frequency? How do you find the other?
georgehifi's avatar
georgehifi
10,312 posts
 
You say your amp this 10kohm, this is the 10000 in the formula, and the 5 is the 5uf cap I said should be the minimum for -3db at 3.18hz bass rolloff.

Cheers George 
sqitis OP
55 posts
 
Yes it's 10k according to SL. So that's only down 3db at 3.18hz?  I can live that if so....LOL
georgehifi's avatar
georgehifi
10,312 posts
 
Yes that’s if the coupling cap is 5uF that I used as a hypothetical.
If it's 1uf the -3dB is at 16hz. or .47uf the -3db at 32hz

Cheers George
kalali's avatar
kalali
1,977 posts
 

Why would they not use a higher value capacitor if that improves the sound and provides more pairing options? Cost can't be the reason since the price differences is not much. There must be other reasons or design tradeoffs.

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