Kramer 900 Series Compact Stereo Power Amplifier

The Kramer 900 Series includes compact, high-efficiency Class‑D stereo amplifiers designed for speech reinforcement, multimedia audio, and AV system integration. Each model delivers stereo output with power levels ranging from 10 W to 40 W RMS per channel, supporting diverse input types and control options to suit classrooms, presentation spaces, and boardrooms.

Models vary in power output, control features, and form factor compatibility. The 900N and 900xl are optimized for lighter loads and unbalanced sources, while the 907 and 907XL offer higher power with balanced audio support and DIP-switch gain control. All models support Kramer Tools or MultiTOOLS rack-mounting formats, making them versatile for both standalone and integrated installations.

Key Features

• Amplifier Type: Class‑D stereo amplifier
• Power Output:
  • 900N / 900xl: 10 W RMS per channel (4 Ω), music peak up to 35–40 W
  • 907 / 907XL: 40 W RMS per channel (8 Ω), peak up to 150 W
• Inputs:
  • 900N: Balanced (5‑pin terminal block), unbalanced RCA
  • 900xl: Unbalanced RCA and 3.5 mm jack
  • 907 / 907XL: Balanced stereo via terminal block
• Outputs: Stereo speaker output via 4‑pin terminal block
• Controls:
  • 900N: Volume knob, power LED
  • 900xl: Volume & input select buttons, RS‑232
  • 907 / 907XL: Volume knob, mute button, DIP-switch gain, LEDs
• Gain Control: DIP-switch (907/907XL); front-panel or button control (others)
• Protection: Overheat/mute indication, compression threshold control
• Mounting: Tools or MultiTOOLS rack-compatible (3 or 4 per 1U)

Technical Specifications

• Bandwidth:
  • 900N: 24 kHz (-3 dB)
  • 900xl: 25 kHz
  • 907: 20 kHz (-3 dB)
• Signal-to-Noise Ratio:
  • 900N: 55 dB
  • 900xl: 85 dB
  • 907: 60.2 dB
• THD + Noise:
  • 900N: 0.5%
  • 900xl: 0.6%
  • 907: 1.9%
• 2nd Harmonic Distortion:
  • 900N: 0.04%
  • 900xl: 0.35%
  • 907: 0.3%
• Power Supply:
  • 900N: 12 V DC, 2.1 A
  • 900xl: 12 V DC, 2.0 A
  • 907 / 907XL: 24 V DC, 5 A
• Operating Temp (900xl): 0 °C to 40 °C
• Storage Temp (900xl): -45 °C to +72 °C
• Humidity (900xl): 10–90% non-condensing

What's Included

• Amplifier unit (900N, 900xl, 907, or 907XL)
• Power adapter (12 V or 24 V depending on model)
• Optional rack-mount bracket (RK-3T or RK-1)