inDESIGN BM4 4 Channel Strip Mixer/Pre-amplifier



The inDESIGN BM 4 is a high quality mixer for commercial and industrial audio applications.

The BM 4 features 4 Mic/line inputs with microphone input 1 featuring a mute so that a Microphone on this channel will mute all other inputs, useful for paging announcements. The BM 4 provides a mono output. There are 4 alarm triggers: CHIME, ALERT, BELL and EVAC, connected via external mounted screw terminals.

The mixer is part of inDESIGN’s Install Series, which also includes mixer amplifiers and power amplifiers. These units provide excellent features and value.

Warranty: 5 Years

Mic Inputs 

  • Connectors (Mic/Line): Euro Block / RCA
  • Impedance (Mic/Line): 1kΩ / 13.6kΩ
  • Gain (Mic/Line): 20dB to 50dB / 0dB to 20dB
  • Max Input Level (Mic/Line): -28dBu / +10dBu
  • Frequency Response: 20Hz – 20kHz
  • S/N: -86dBu
  • THD+N: 0.3% (20Hz – 20kHz, +4dBu)
  • Phantom Power: 48V
  • Tone Frequency/Control Range: 100Hz / 10kHz

Balanced Outputs 

  • Output Impedance (Mic/Line): 51.1Ω / 150Ω
  • Max. Output (Mic/Line): -16dBu / +24dBu
  • S/N: 90dB
  • THD+N: 0.01% (20Hz – 20kHz, +4dBu)


  • Crosstalk: -75dB @ 1kHz
  • Mains Voltage: 240 VAC, 50/60Hz, 10 Watts


  • Construction: All Steel
  • Size: 4.4cm x 48.3cm x 16cm
  • Weight: 1.8kg


Note: 0 dBu = 0.775 Vrms

To download the BM4 User Manual please click here.

Order weight is calculated on whichever of the dead (actual) or volumetric weight is the greatest. As of 10/9/21 capped $8.80 to $16.50 for up to 20kg to most areas. For orders under $50 options are Standard Postage $8.80 or Express Shipping for $16.50. Orders over $1,000 ship for free. Express Shipping covers one delivery attempt so please provide an address where someone is available to sign for courier delivery between 9am and 5pm weekdays. You can instruct us to ask the courier to leave your parcel unattended in a safe place, although please be aware that if anything happens to the parcel, neither us nor the courier company can be held responsible. Work addresses are a great delivery option. If using a work address please include the business' name.

* for some larger items does not apply to Australian remote island locations, some mainland remote locations (outside Darwin NT and Perth WA metro areas) or outside Australia. If unsure if you are entitled to capped shipping it is best to contact us prior to placing order.