That's what I had. Plenty powerful for AKG701, DT770Pro80, & a host of Senns. 
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source: Onkyo DX-7555 cd player
headphone amp: CIAudio VHP-2, w/ VAC-1 power supply
headphones: Sennheiser HD600, Sennheiser HD650
interconnect: Blue Jeans Cable LC-1
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FORMER headphone amps: Zana Deux, Melos SHA-1, Musical Fidelity X-Cans v2, Creek OBH-11, Lehmann Black Cube Linear, Naim Headline 2 w/iSupply power supply, WooAudio 3, Headroom Millet Hybrid, PS Audio GCHA
FORMER headphones: AKG K701, Denon D5000, Koss ESP-950, Stax 3030 system, Stax 3050 system, Sennheiser HD595, Sennheiser HD580, Sennheiser HD580 Jubilee, Sony SA5000, Beyerdynamic DT880 (2005 ed.), JVC HP-DX1000, Grado SR60, Beyerdynamic DT770 Pro 80
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