• Intro

    REF500S Stereo Amplifier

    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.

    • Max Power Output: 500W 4 ohms, 250W 8 ohms per Channel
    • Minimum Load: 2 ohms per Channel
    • Peak Output Current: 35 Amps per Channel
    • Balanced Input Impedance: 200 Kohms

  • Features

    REF500S Stereo Amplifier Features


    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.

  • Specs

    REF500S Stereo Amplifier Specifications


    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: 2 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
    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.

  • Reviews

    REF500S Stereo Amplifier Reviews

    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."