I've been researching balanced headphone amplifiers to be fed by my Lavry DA11. Headphones will be either the HD800's or LCD-2's. I would only be using it as a stationary desktop amplifier. So far I've only been looking at full-size amplifiers as I have no need for a portable amplifier. However, after reading about the new SR-71B on the RSA website and the various reviews here, it appears the SR-71B offers performance that is comparable to and often superior to other full-size balanced headphone amplifiers, at any price. On the RSA website it even states: "This makes SR-71B as compatible to the best of home base amps if not better. " (Note: I'm assuming he meant "comparable" to, not "compatible to") Given that, I have a few questions: 1) Other manufactures, such as Red Wine Audio, feel that operating off battery power offers the best performance. Does the SR-71B only draw power from the batteries or if the batteries are depleted, will it still function if plugged into the AC adapter? Can I just leave the SR-71B plugged into it's charger all the time? 2) Is the balanced plug for the SR-71B only available in a right-angle configuration, or are there plugs available that plug straight in like a typical XLR or RCA plug would? As I said above, I would use the SR-71B as a desktop amplifier only and have no need for the space savings a right-angle plug offers, and would thus prefer a straight plug instead. 3) On the RSA website ( http://www.raysamuelsaudio.com ) it also states: "There is nothing out there to even come close to what the SR-71B can offer. The state of the art fully differential input to output with best audio specs ever when it comes to low noise, bandwidth, slew rate & dynamics. " I can't seem to find published specs for the SR-71B to corroborate this -- does anyone have a link to the SR-71B's specifications? 4) Any supporting or opposing feedback on the above assertion that the "SR-71B offers performance that is comparable to and often superior to other full-size balanced headphone amplifiers, at any price", is appreciated. 5) For fun, has anyone compared the SR-71B's balanced output SQ to that of RSA's "The Apache" balanced headphone output? Thanks!