Crown 28M- Rack-Mountable 8 x 2 Preamplifier/Mixer


Crown 28M- Rack-Mountable 8 x 2 Preamplifier/Mixer Crown 28M- Rack-Mountable 8 x 2 Preamplifier/Mixer

The 28M, part of the Commercial Audio Series from Crown Audio, is a rack-mountable preamplifier/mixer ideal for use in factories, schools, hospitals, restaurants, offices, and other venues. It features eight mic/line inputs with stereo RCA jacks and balanced phoenix-type connectors and two outputs with balanced phoenix-type connectors. Priority muting is included for paging.
Individual volume, bass, and treble controls are provided for each input. LED signal indicators are provided for each input and the output. A built-in tone generator provides bell, pre-announce chime, alert, and evacuate tones.

  • Eight input channels, each with stereo RCA jacks and balanced phoenix-type connectors
  • Two output channels with balanced phoenix-type connectors
  • Each input may be assigned to any combination of outputs
  • Priority muting for paging
  • Built-in four tone generator
  • Signal indicator LEDs
  • Level, bass, and treble controls for each input
  • Phantom power

Click Here To View Product Manual
Click Here To View Product Brochure

Frequency Response: 20Hz - 20kHz
Signal to Noise Ratio: 100 dB
Total Harmonic Distortion (THD): 0.05% (Typical)
Input Sensitivity:

  • Balanced Mic: 3mV
  • Balanced Line: 800mV
  • RCA: 400mV

Input Impedance:

  • Mic: 400 ohms
  • Line: 100 k ohms
  • RCA: 50 k ohms

Crosstalk: -50 dB
Output Level: 1.2V
Phantom Power: 15VDC
Controls Front Panel:

  • 1 x Power Switch
  • 8 x Input Volume Control Knobs
  • 8 x Bass Controls
  • 8 x Treble Controls
  • 2 x Output Volume Control Knobs

Controls Rear Panel:

  • 1 x Mixer Config. DIP Switch (For Priority Muting and Phantom Power)
  • 8 x Mic/Line Selector Switches
  • 2 x Output Tone Control Potentiometers
  • 16 x Input Routing Dipswitches


  • Green LEDs for Input and Output Signals on Front Panel
  • Red Clip Indicator LED
  • Blue Power Indicator LED


  • 1 x AC Power Inlet
  • 1 x 2-Position Terminal Strip (24VDC Backup Power)
  • 1 x 3-Pin Phoenix Connector for Priority Muting
  • 2 x 3-Pin Balanced Phoenix Output Connectors
  • 1 x 5-Pin Phoenix Connector for Tone Generator
  • 8 x Balanced 3-Pin Phoenix Input Connectors
  • 8 x RCA Stereo Input Pairs (16 Jacks Total)

Dimensions (WxHxD): 19 x 1.75 x 10.7" (483 x 45 x 272mm)

Other Details:

  • Manufacturer: Crown
  • Model: 28M
  • SKU: 28M
  • Shipping Weight: 14.2lbs

  • Crown Audio 28M - Rack-Mountable 8 x 2 Preamplifier/Mixer
  • Power Cord
  • 2 x Detachable Rack Ears
  • 3 Year Limited Warranty

- Other Items of Interest -

Poll Sound BBB Business Review Poll Sound is a proud member of the Audio Engineering Society Poll Sound is an infocomm international member info comm Poll Sound is a member of the National Systems Contractors Association
Poll Sound Audio Perfection Logo

© 2017 Poll Sound · Terms · · · 1-800-898-2508