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The R-Series amplifiers utilize Alpine’s advanced amplifier platform that takes the classic Class-D amplifier circuit and adds dual post-filter feedback loops for unmatched accuracy and control. This technology., originally launched in the premium X-Series amplifiers,, produces efficient power with enhanced dynamic range, qualifying the R-Series amplifiers to be Hi-Resolution Audio compliant. This new technology minimizes audible imperfections like excessive phase shift and internal noise which can deteriorate sound quality. With an incredibly low phase shift of 46°, the R-A60F 4-channel amplifier delivers accurate imaging compared to well over 100° of phase shift by a competitive amplifier model. This superior phase curve ensures a proper sound stage among the singers and instruments. Specifications Alpine's Class D amplifier circuit 100W RMS x 4 (4Ω, 14.4V, ≤ 1% THD+N) 150W RMS x 4 (2Ω, 14.4V, ≤  1% THD+N) Bridged: 300W x 2 (4Ω, 14.4V, ≤ 1% THD+N) S/N >85dB (ref. 1W into 4Ω) • THD+N≤ 0.03% (ref. 1W into 4Ω) Frequency response =10Hz to 45kHz (+/- 3dB) Damping Factor >500 Alpine R-A60F Manual

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