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SY Electronics 1A-25R

2 × 25W Compact Stereo Audio Amplifier with RS-232 control

£178 (£213.60 inc. VAT)
Availability: In stock

SY Electronics 1A-25R

The SY-1A-25R is a Compact 2x 25W Audio Amplifier, with RS232 Control.

This stereo amplifier has both balanced and unbalanced analogue inputs. The efficient class-D stereo amplifier provides 25W per channel into a pair of 8ꭥ speakers.

This AMP is configurable to work in either Mono/Stereo modes for compatibility with various speaker configurations, and is able to work with loud speaker load impedance of between 4ꭥ and 8ꭥ per channel.

To ensure a neat installation, all connections are on the rear side via phoenix connectors. A rack mount shelf is also available as an optional accessory SY-RS-01

The 1A-25R is fully controllable via RS232, this includes Absolute Volume which can be crucial for exact/ accurate system control when used with control systems

This unit is compact and light weight, with high efficiency and low heat dissipation thanks to the modern class-D design, making this an ideal product for rack installation and for fitting into credenzas and AV cupboards as found in many boardroom and classroom equipment installation scenarios. Ideal for small to medium size meeting rooms.

  • Balanced Analogue Stereo input
  • Mono/Stereo modes
  • 25 watts output per channel into 8Ohms
  • 4 to 8Ohm speaker compatible
  • RS232 controllable
  • Absolute Volume commands
  • Efficient Class-D design

SY Electronics 1A-25R Specifications


Inputs 1x L+R Stereo Balanced Analogue Audio input
Outputs 1x L+R 8ꭥ speaker output
Amplifier Design Efficient Cool Running Class D


Power Output 25 watts per channel into 8ꭥ
THD+N (1 kHz at full power)
75 dB Input Impedance 15 k Ω
Permissible Speaker Load Impedance 4ꭥ to 8ꭥ speaker compatible
Configurations Mono/Stereo modes via DIP Switch


Ports 1x RS232 port
3 Pin Phoenix connector
RS-232 Settings 57600bps 8 data-bits No parity 1 stop bit No handshaking


Dimensions 108 × 41 × 75mm
Weight 200g
Operating Temperature 0 - 40 °C non condensing
Power Supply 24V DC, 3.0A max
2 Pin phoenix connector
Power Consumption 55W Max
Whats In The Box 1 × SY-1A-25R Audio Amplifier
3 × 3 pin screw terminal connectors (3.5mm pitch)
2 × 2 pin Screw terminal speaker connectors (5.08mm pitch)
1 × 24V 3A Power Supply with 2 pin connector
1 × Quick Start Guide