I voted for the Raptor because it has excellent punchy and powerful bass. Tubes for the Raptor are relatively inexpensive which is a plus. The Raptor mates very well with my current headphones, HD650, Edition 9 and the K340. The K340 is one of the hardest to drive dynamic headphones and Raptor drives it extremely well (very nice highs, not bright at all and great bass). Bass with the 650 is deep and tight. I bought my 650 about 3 weeks ago and it sounds great with the Raptor. Another plus is the service from Ray Samuels. I was one of the first Raptor buyers and he has upgraded my amp twice to the latest level. Both upgrades were completed in less than 10 days and that includes the shipping time.
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Headphones: Edition 9, HD650, K340, Shure E500 and Ety ER4P
Previously owned headphones: RS1, CD3000, K1000, K701, K501, HD600, HD580, SA5000
Headphone Amps: RSA Raptor with the Plitron transformer in the new power supply, Hornet M
Digital Sources: Rega Saturn CD player x 2
Analog Source: Linn LP12, Lingo Power Supply, Ekos arm, Grado Reference Reference cartridge
Speaker System 1: Thiel CS6, Classe CA400amp, Convergent Audio Technology SL1 Ultimate Tube Preamp, Rega Saturn, Magnum Dynalab MD106T tuner, MIT cables, Running Springs Jaco and Richard Gray power conditioners
Speaker System 2: Revel M20's on Sound Anchors stands, REL Strata III subwoofer, Mark Levinson No. 383 integrated amp, Rega Saturn CD player, Fanfare FT1A tuner, Analysis Plus speaker cables and Cardas Neutral Ref IC, PS Audio P300.
Portable System: 80GB i-Pod, Hornet M, Etymotic ER4P and P-S cable, Shure E500
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