We noted two small snags with the RA1: Even with its volume control turned up all the way, it wouldn't play all that loud with other brands of headphones. Our Sennheiser HD-580 and Ultrasone HFI-2000 headphones never made it past moderately loud. That's why Grado introduced a "high-gain" model, the RA1-HG ($425), for use with other brands of headphones. Second: When the amp is turned on or off, you'll hear a pop sound through the headphones. We got around that problem by removing the headphones from our head when we switched the amp on or off.
The Grado RA1 is a welcome addition to any listening station, but even the battery-powered version is a bit hefty for toting around. Listeners on the go can opt for HeadRoom's AirHead or BitHead headphone amps instead--both are more affordable and portable than Grado's luxurious offering.
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