$495.00 at  
JR.com  
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Grado RS2i Reference Series-2 Stereo Headphones

$495.00 at  
BHPhotoVideo.com  
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RS2i Dynamic Open Air Supra-Aural Stereo Headphones (Wood/Black), Based on the RS2, Mahogany Earpieces, Vented Diaphragms, Adjustable Headband, Foam Ear Cushions, ULHPC Copper Voice Coil, 8-Conductor

$495.00 at  
Crutchfield.com  
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Grado RS 2i headphones

You cannot keep it on your ears more than 30 minutes.There's a lack of bass that makes the sound always excessively brilliant. It's not worth the US[$] you pay for it.I have the AKG 701, the B&W C5 and two Bose QC15/OE2 that sound better, are more comfortable and cost less.

These are really good headphones. These are just below the RS1's in terms of performance. However, the Grado house sound is here. These are low impedance headphones, so having an amp capable of driving them is a must. I generally find that tubes works well with Grado.