Any recommendations for a 1 ohm output headphone amp for 10 ohm headphones?

(sorry, reposted this from the IEM forum)

Any recommendations for a 1 ohm output headphone amp for 10 ohm headphones?

I'm using these for research:

http://www.etymotic.com/pro/er1.aspx

... and just learned that the headphone amp in our lab's E-MU 0202 (http://www.emu.com/products/product.asp?category=610&subcategory=611&product=15186&nav=technicalSpecifications) has too high an output impedance, and I could risk damaging them by using it.  Unfortunately, I can't adjust the output amplitude of the two 1/4" line outs, which probably have lower impedance, and right now the volume simply isn't high enough for our project.  

I'd like something with independent left and right 1/4" output jacks (to avoid any crosstalk in the wires, unless that isn't a concern?), and independent 1/4" left and right input jacks, but I can be flexible about both of these if the general consensus is that crosstalk isn't a concern (I've been told it matters if the difference between the channels is > 40 dB, which I don't think is the case in our current study, but could be in the future).