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Old 1st February 2012, 11:18 AM   #1
wwenze is offline wwenze  Singapore
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Join Date: Mar 2008
Default 16 or 33ohm for dummy load?

I'm going to build a new dummy load to test headphone amps with. But I'm stuck between choosing 16 or 33 ohm resistor.
Previously I was using 33 because I was thinking "16 ohms are probably IEMs that get way too loud before the amp hits its current limit". But now I am thinking, if I want to test with low impedance load, might as well go all the way and choose the lowest common value.

Whatcha guys think?
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Old 1st February 2012, 02:20 PM   #2
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Location: Germany
Some people use 33 ohms, others use 15. That's up to you. It's more important that you have both a low and high impedance dummy load (like 33 & 330, or 15 & 330), and a way to determine output impedance.

For the latter I'd use an R || R-C combo. Maybe 10k || 100R - 470n (polypro). (Hmm, seems a little high still. If you've got bigger film caps floating around, you can try lower R values.) It's easy to calculate output impedance from the resulting FR variation. I have that in spreadsheet form already.

Make sure your Rs can take enough power (for the pure Ohmic loads at least), as some amps can output a few watts. I'd say 2x2 1-watters (long legs) in a parallel-series arrangement at the very least.
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