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The REF501S stereo amplifier has incredible power per square inch with two independent mono boards in a single chassis. Independent power supplies and isolated input signal filter technology reduces high power amplifier energy for a cleaner, transparent power.
The Bel Canto Impedance Optimized Input Stage is a balanced high Common Mode Rejection, low output impedance driver that is critical to the amplifier's performance, ensuring that the refined dynamic qualities of the recording are preserved.
Custom Power Input AC/DC Filter and Energy Storage
Our custom AC/DC input filter and energy storage stage to allows the amp module to operate in a better controlled environment, providing lower noise operation and better dynamic signal handling, making the amplifier sound ‘bigger’ and conveying dynamic nuance more accurately.
WBT NextGen Speaker Connectors
The WBT NextGen connectors provide the best possible connection from the amplifier to the speaker cables. We choose them because they impart minimal sonic signature to the sound, remaining open and grain-free up throughout the audio frequency band.
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Maximum Power Output: 400W 4 ohms, 200W 8 ohms per channel Power Output 1% THD: 250W 4 ohms, 150W 8 ohms per channel Minimum Load: 3 ohms per channel Peak Output Current: 35 amperes per channel 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 RCA input impedance: 100Kohms Balanced input impedance: 200Kohms Output connections: 2-sets WBT Nextgen 5-way binding posts Power On usage: 19W Power Off usage: 0.0W Internally Set Operating Voltages: 100-120VAC or 230-240VAC 50/60 Hz Size: 8.5 x 3.5 x 12[inches], 216 x 88 x 305[mm] (WxHxD) Weight: 15 lbs, 7 Kg
