The SB-1250 all-discrete amplifier design has exceptional sonic quality and a conservative power rating of 250 watts continuous output.

To facilitate easy connection and ideal system integration, the SB-1250 has inputs and outputs for line-level phono and speaker level signals. Separate controls allow you to set bass level and upper roll-off frequency between 40 – 200 Hz, with a bypass for using the filter in a home theater receiver.


Vinyl or Metal
18 x 15.25 x 23” – 45.7 x 38.7 x 58.4 cm

Frequency Response:
20 Hz – 200 Hz ±3dB

Low-Pass Filter:
40 Hz-200 Hz, continuously variable, or Bypass

Power Handling:
250 Watts RMS

45 lbs/20.4 kg

For optimum room integration and precise fine-tuning of the critical transition between the subwoofer and the main speakers, the phase control is continuously variable between 0 and 180º. The SB-1250 handles the crucial bottom octaves with sublime balance, power and impact.



The SB-1250 is a powered subwoofer that uses a special high-performance 12” Super Fast Deep Bass™ long-throw, coated pulp cone, magnetically shielded driver in a sealed Deep Bass enclosure design which delivers enhanced low frequency extension down to 20 Hz.

A continuously variable phase adjustment from 0-180 degrees allows for perfect integration of the subwoofer with any speaker system and listening room. Speaker level and line level connections are included for maximum set-up flexibility. An automatic On/Standby switching circuit activates the amplifier when a signal is detected and turns it off after a period with no signal. The all-discrete 250 Watt power amplifier circuit features exceptional deep bass power and sonics.

Thanks to M&K SOUND’s unique Headroom Maximizer™, the SB-1250 achieves the most musical performance in its class with incredibly powerful and dynamic output.

Available in black vinyl finish with black metal mesh grille.