The REF500S 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.
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.
|Maximum Power Output:||500W 4 ohms, 250W 8 ohms per channel|
|Power Output 1% THD:||400W 4 ohms, 200W 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)|
|Output Impedance at 100Hz:||<8 milliohms|
|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 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|
Features and specifications are subject to improvements and changes without prior notice.
CNET, Steve Guttenberg, Aug 2010
"For such a little thing (8.5 by 3.5 by 12 inches), the REF500S is seriously powerful, it can deliver 250 watts into 8 ohm speakers; 500 watts into 4-ohm-rated speakers. … Top-quality parts including Caddock resistors, special ultra-low ESR decoupling capacitors, and low-noise regulated power supplies. That's all on the inside; I think the amp looks really cool. … The REF500S sounds stellar on my Magnepan MG 3.6/R speakers, which are one of the toughest speakers to drive well."