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Ok-- for the non-audiophile's in the room.
I'd like to use this in conjunction with a completely restored Marantz 2325 (think: very high-end vintage) and connect it to the "tape-out" RCA's. So, that means desktop model? I'll be using the Massdrop x Sennheiser HD 6XX Headphones-- Do I want Standard Gain (2.5x Low, 6.5x High) or Medium Gain (1.0x Low, 3.3x High) for these headphones? I have no idea! Thanks!
I have a JDS Labs O2 and am running standard gain. Usually on the low gain setting. Medium gain would be better for things like in ear monitors...aka ear buds.
I have this amp (3.5mm headphone and input jack on the front, AC on the back) with the standard gain setup (2.5/6.5). "Desktop" mode refers to having a RCA input on the back, assuming that you could hook it up to a "desktop-sized" item, like your Marantz. In retrospect, I wish I would have configured my amp with the RCA's in the back. Oh well...
Unless you listen exclusively to low-impedence IEM's/headphones (16-32 ohms), I would go for the standard gain version. My main cans are the AKG K612Pro's and for something with "only" 150 ohms impedance, they sure need a lot of power to drive properly. Under its medium gain, I can max the volume and get a fairly loud output so I set it to Standard. I can get that same output at about 11 o'clock.
Having said that, I also use high-impedence earbuds with it as well (Ty Hi-Z 150 and Yuin PK1 - recabled). Both of these are rated at 150 ohms as well but don't need quite as much power to drive properly. On the flip side, I also have the Final Heaven III IEM's (Massdrop edition) that are rated at 16 ohms. Because of its very low impedance, the medium setting is way more than enough. I can't get it past 9 o'clock without inducing ear bleed on those things. However, it should drive your 6XX just fine.