No, it wouldn't short-circuit an amp - with the output plugged into an amplifier it's basically just acting as a line-output. For best results turn the volume on the Groove up as high as possible without overloading the amplifier's inputs.

Stereophile just posted their review for the Groove and it's one of the most comprehensive we've seen anywhere - worth reading if you have any remaining questions about the product! Apogee Electronics Groove D/A headphone amplifier

Sorry, we don't have one of those to test it on! I'll let you know if we're able to test it in the future, though.

Yeah, then that's the tricky thing - with certain models it works really well! It depends on the design of the particular headphone, but since we (sadly) don't have access to all of the IEMs in the world, we decided to take the safe route and just say that we don't recommend that style because...

There aren't any special adjustments or settings for high-impedance vs low-impedance headphones. That's one of the main benefits of the current-drive design; it adapts its performance depending on the headphones you plug in so that it works very well with headphones from low-impedance to...

  There are actually muting circuits in the Groove, but the muting is more like 90% than 100% for fidelity/quality reasons. So it wouldn't be out of the ordinary for you to hear a light pop when switching sampling rates, but not a big one. If it's doing something really different with one piece...

Low impedance headphones are where the Groove is going to make the biggest difference compared to the Apogee ONE. The ONE/Duet/Quartet headphone amps are optimized to work at their best with higher-impedance studio headphones (250 ohm and up). Not only does the Groove have a better DAC than the...

I can say that we are experimenting with some mobile power options, but I can't say for sure that they will end up as retail products. When we designed the Groove we were only intending it to work with the full-spec USB ports on Mac/PC computers for maximum power and fidelity. It just so happens...

Hi everyone! My name's Don, and I'm the US/Canada sales rep for Apogee Electronics products. At this point we've taken the Groove to several CanJam events but haven't actually had someone with a presence here on Head-Fi, so we figured it's about time. If anyone has any questions about the Groove...