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SEX amp headphone impedance matching?

Posted by Todd R (A) on November 5, 2005 at 05:11:55

I'm trying out the Ultimate Ears SuperFi 5 Pro canal phones right now.
They sound great with portable gear (iPod shuffle), and from my computer.

But, I bought them to use with the big home system, (Bottlehead SEX amp, Cary 303/200).

Sennheiser 650's (300 ohm) and Grado HF-1 (32 ohm) sound great on this system, but the SuperFi 5 (21 ohms) sounds dull with a honk in the midrange when used with the SEX amp.

I'm suspecting that the SEX amp does not like the low, 21 ohm impedance of these phones, am I right?

Can someone point me to plans to make an impedance matching device or some other solution to make these headphones get along with the SEX amp?
Todd R

Todd's Audio links

• Ultimatae Ears SuperFi 5   (Open in New Window)

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