來自美國的Bel Canto發表了全新e.One系列，目前包括三台後級：S500 (USD 2,995/台)、REF500 (USD4,990/1對)、REF1000 MKII (USD 5,990/1對)。e.One系列的擴大機使用類比交換式放大技術(analog switching amplifier technology)，並採用全平衡設計的輸入級，高檔的元件，包括Caddock電阻、Solid Electrolytic電容、低噪音的電源供應。REF1000的用家若要升級到REF1000 MKII，費用為USD 2,000。

REF1000 MKII Mono Amplifier
Power Output：>1000W into 4 ohms, >500W into 8 ohms
Minimum Load：2 ohms
Frequency Response：+/-0.5dB 20Hz-20KHz, all loads
THD+N 0.007% 1W, 1KHz, 4 ohms
IMD (CCIF)：0.0007%, 1W, 14:15KHz, 4 ohms
Output noise：90uVRMS A-weighted 10Hz-20KHz
Voltage gain：27dB (single ended or balanced input)
Damping factor：>1000
Output Impedance at 100Hz：<8 milliohms
Dynamic Range：120dB
Input Voltage for Max Output：3Vrms
Input connections：Single-ended RCA or balanced XLR
RCA input impedance：100Kohms
Balanced input impedance：200Kohms
Output connections：1-set WBT 5-way safety binding posts
Standby Power：15W
Size：8.5x3.5x12[inches], 216x76x305[mm] (WxHxD)
Weight：15lbs, 7Kg

REF500 Mono Amplifier
Maximum Power Output：500W 4 ohms, 250W 8 ohms
Power Output 1% THD：450W 4 ohms, 225W 8 ohms
Frequency Response：+/-0.5dB 20Hz-20KHz, all loads
THD+N 0.007% 1W, 1KHz, 4 ohms
IMD (CCIF)：0.0007%, 1W, 14:15KHz, 4 ohms
Output noise：90uVRMS A-weighted 10Hz-20KHz
Voltage gain：27dB (single ended or balanced input)
Damping factor：>1000
Output Impedance at 100Hz：<8 milliohms
Dynamic Range：120dB
Input Voltage for Max Output：3Vrms
Input connections：Single-ended RCA or balanced XLR
RCA input impedance：100Kohms
Balanced input impedance：200Kohms
Output connections：1-set WBT 5-way safety binding posts
Standby Power：15W
Size：8.5x3.5x12[inches], 216x76x305[mm] (WxHxD)
Weight：15lbs, 7Kg

S500 Dual Mono Amplifier
Maximum Power Output：500W 4 ohms, 250W 8 ohms
Power Output 1% THD：370W 4 ohms, 200W 8 ohms
Minimum Load：3 ohms
Frequency Response：+/-3 dB 1.5Hz-70KHz, all loads
THD+N 0.003% 1W, 1KHz, 4 ohms
IMD (CCIF)：0.0003%, 1W, 14:15KHz, 4 ohms
Output noise：35uVRMS A-weighted 10Hz-20KHz
Voltage gain：27dB (single ended or balanced input)
Damping factor：>1000
Output Impedance at 100Hz：<8 milliohms
Dynamic Range：121dB
Input Voltage for Max Output：2Vrms
Input connections：Single-ended RCA or balanced XLR
RCA input impedance：100Kohms
Balanced input impedance：200Kohms
Output connections：2-sets WBT 5-way safety binding posts
Standby Power：19W
Size：8.5x3.5x12[inches], 216x76x305[mm] (WxHxD)
Weight：15lbs, 7Kg