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I'm interested in getting this to pair with my HD700s, Q701s, K240s, and my UE900 IEMs. My concern is that this is listed at 60-600 ohms and my K240s are only 55 and my IEMs come in at just 30 ohms. Would it be an issue to use this with the K240 and UE900s?
Headphones below 60ohms might pick up hum from the noise floor as they're too sensitive for this amp. YMMV
I actually paired the one we have at the office with the Fostex TH-900 (25 ohms)and the Noble FRs (<30 ohms for the R) with no hiss that I could hear.
It's not actually hiss or a sensitivity issue, it's an impedance mismatch. The result will be a modification in the frequency response, attenuating the bass and high frequencies.
The Bottlehead forums have a lot of great info on this in the Crack section, and I can personally attest to it after building both a Crack and a S.E.X. and directly comparing them. They were effectively identical on the HD650s, but had a very different presentation on the HE500s. Neither had any hiss.