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Classe Delta Stereo Power Amplifier - DELTASTEREO

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Abt Model: DELTASTEREO UPC: 883795004800
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Classe DELTASTEREO Delta Stereo Power Amplifier

The Delta STEREO distills all of Classé's innovation and knowledge into a compact high-performance stereo amplifier.

In situations where dual mono amplifiers can't be accommodated, Delta STEREO offers uncompromizing performance in a single component.


  • Amplification
    The first 12.5W of power output are pure Class A, and with a total of 250W per channel at its command (over 350W/Ch @ 2Ω), this compact, powerful amplifier drives loudspeakers with utmost confidence.
    • Up to 12.5W per Channel delivered in pure Class A operation
    • 250W per Channel total
    • Massive, high-quality power supply
    • Custom toroidal transformer
  • Clarity
    Delta STEREO delivers exceptional clarity. Every effort has been made to preserve complete separation between channels, delivering the natural, expansive sound that Classé is legendary for.
    • Hand-laid circuit boards
    • 6-layer circuit boards provide for shortened signal and power pathways with lowest noise
    • 22 4-pole Mundorf® capacitors
    • Custom-made Navcom® feet to absorb vibrations
    • Furutech® rhodium-plated RCA and torque-guard speaker connectors
  • Design
    • Delta STEREO has presence. It’s capabilities are expressed through design and it looks fantastic in any room or installation.
    • Superb material finishes and a pair of custom-designed illuminated VU meters display power output for both channels beautifully.
    • Delta Series design concept is to create a monument to sound. This amplifier looks every bit has capable as it sounds.


  • Frequency Response (-3dB, 50Ω source impedance): 1Hz – 650kHz
  • Continuous Output Power (at 1kHz, 0.1% THD+N)
    • 12.5W/Ch @ 8Ω delivered in pure class A operation
    • 250W/Ch @ 8Ω
    • 500W/Ch @ 4Ω (with AC line held constant)
    • 350W/Ch @ 2Ω (with AC line held constant)
  • Harmonic Distortion (measurement bandwidth: 500kHz, 25Vrms in 4Ω or 8 Ω)
    • <0.0016% at 1kHz
    • <0.002% at 10kHz
    • <0.003% at 20kHz
  • Harmonic Distortion (measurement bandwidth: 90kHz, 20Vrms in 4Ω or 8 Ω)
    • <0.0007% at 1kHz
    • <0.001% at 10kHz
    • <0.0025% at 20kHz
  • Peak Output Voltage (nominal AC line)
    • 129Vp-p into 8Ω
    • 138Vp-p no load
  • Input Impedance (at 1kHz, BAL / SE): 82kΩ
  • Voltage Gain (at 1kHz, BAL / SE): 29dB
  • Intermodulation Distortion (SMPTE 4:1) (8Ω or 4Ω, BAL / SE): <0.0018%
  • Intermodulation Distortion (CCIF) (8Ω or 4Ω, BAL / SE): <0.004%
  • Signal-to-Noise Ratio (A wtd in par enthesis) (22kHz BW): 118dB (120dBA)
  • Crosstalk (one channel driven to 250W / 8Ω): 124dB (100Hz), 107dB (1kHz), 90dB (10kHz)
  • Slew Rate: 75V / μs
  • Output Impedance: 0.009Ω (100Hz), 0.009Ω (1kHz), 0.012Ω (10kHz)
  • Damping Factor (at 1kHz, ref 8Ω): 850

Approximate Dimensions

  • Height: 8.74"
  • Width: 17.5"
  • Depth: 19.37"

Approximate Weight

  • Unit: 102.3 lbs
  • Shipping: 116.4 lbs
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