Preamp and Power Amp Matching

Hey y’all. Because numbers generally cause my brain to seize up, I am hoping to confirm my layman's understanding of matching amps.

The input impedance of the power amp should be at least 10 times higher than the output impedance of the preamp, correct?

My current amp has an input impedance of 30K ohms. One preamp I'm looking at has an output impedance of 440 ohms. This could work, right?

Thanks for checking my math!

rblondeau07-20-2023 5:43pm

christianb5s4 Details Discussions Posts This discussion Message User 236 posts 07-20-2023 at 05:55pm Copy Comment URL Report Comment Edit Delete The 10x rule is correct, that's a safe basic principle for preamp / amp matching. Which would mean the above impedances would work fine.
tomcarr Details Discussions Posts This discussion Message User 1,504 posts 07-20-2023 at 05:57pm Copy Comment URL Report Comment Edit Delete It should.
fuzztone Details Discussions Posts This discussion Message User 5,598 posts 07-20-2023 at 06:43pm Copy Comment URL Report Comment Edit Delete Bingo.