Impedance matching for DYI RCA attenutators
Hi,
I have a vintage amp with inputs that are too sensitive for my sources. I would like to try a DYI RCA attenuator similar to what is described here:
http://audiokarma.org/forums/index.p...uators.392186/
However after reading theory about how pi-attenuators I still don't understand how important is to match the input impedance or if this is not essential. For example, the OP suggests using a symmetrical pi-attenuator to match 47 KOhm both for input and output, while the last post in the thread suggests matching both input and output separately, though this turned out to be impossible and a closely matching attenuator is proposed as a result.
Since even a close match for 10db, Zin = ~500Ohm and Zout=60kOhm for my system is impossible, I wonder how important is to match the input impedance? Would it make any difference and may be using the Zin to be the same as Zout would still work fine, or shall I try minimizing the mismatch both for Zin and Zout?
Thanks