Focus Us On

PA System M/S Amplifier Switch RH2821M

※ Connect to 5 main  amplifiers and 1 spare amplifier.
※ Automatic detection of fault units,and the first fault detected unit will be   
automatically switched to the spare unit,other fault units if later detected  
will be brought to your attention by the indicators.
※ Prompt tone will ring should any main unit fails.
※ Indicators have three different indications:Normal,Fault,or Spare.
※ Address setting using decimal system.
  • Description
  • Specification
The Main/Spare Amplifier Switch RH2821M monitors up to five main amplifiers in the pa system,RH2821Mwhich will be switched automatically to the spare amplifier should any one fails,with five independent channels, it can also be operated manually for power amplifier upgrades and maintenance, each channel has a volume control, manual switch,and status indicator.

Reference Connection:

RH-AUDIO Main/Spare Amplifier Switch RH2821M

• Only one main amplifier is used in above connection,the Main/Spare Amplifier Switch RH2821M can support connecting five main amplifiers in the same time.
• Make sure the terminals of  "+" and "COM" are connected correctly to match each other between the devices.




Main Channels

5 channels 'CH1~ CH5'Phone signal

Spare Channel


Channel Capacity

150V/20A,audio signal

Input Signal

0.775V(0dB),10k ohms,unbalanced

Output Signal

0.775V(0dB),10k ohms,unbalanced

Cycle Time

20mS,cycle times 30

Input Checking

50mV,cycle time 20mS

Output Checking

100mV,cycle time 20mS

Speaker Terminals

Speaker output (CH1-CH5)

Power Cable

(3×0.5 mm2)×1.5M

Power Supply

AC 220V ± 10% 50-60Hz

Power Consumption

20~ 25W



Packing Size 


Net Weight


Gross Weight


Related Products
  • 20W Waterproof Landscape Speaker RH-S51

    20W Waterproof Landscape Speaker RH-S51

    January 9, 2018The RH-AUDIO 20W Waterproof Landscape Speaker RH-S51 delivers excellent over a wide listening area, an excellent choice for indoor if you prefer not to mount speakers to your home, and also for outdoo...view
  • MP3 FM Bluetooth Digital Class-D Amplifier

    MP3 FM Bluetooth Digital Class-D Amplifier

    January 9, 2018These Bluetooth Mixing Amplifiers are designed as convenient solution for small to medium PA installations with USB/SD player,FM tuner and Bluetooth receiver in a compact housing.view
  • PA System Mixer Amplifier

    PA System Mixer Amplifier

    January 9, 2018The Audio Signal Mixing Amplifiers are designed for background music/paging and public address system installations,these units are exceptional values, and are easy to installview
Leave a Message Email Us

we will contact you within 24 hours.

  • TEL:+86-20-39388220
  • FAX:+86 20 31072811
  • EMAIL:info@rh-audio.net
  • ADDRESS:Floor 6, Building J, Kaida Industrial Park, Shixin Road, Xinshuikeng Village, Panyu District, Guangzhou China.