Servo Sealed Plus Kit and Flatpack (Single)


XLR amp upgrades are currently unavailable

120V-60Hz regions only
Due to incompatibilities with 240V mains power, we can no longer offer these amplifiers for much of the global market.



About the SUB Series “Servo Sealed Plus”

This package comes with a single SW-12-04 servo woofer and the HX370 amp. This design is for sealed box applications using 1.5 to 1.8 cubic feet of air space. This combination is the least expensive way to get into the higher performance levels of servo controlled bass response. The HX370 amp has all the key features necessary to allow easy blending to main speakers. And with 370 watts of power it can deliver solid SPL levels that reach down into the teens.

About the Flatpack’s:.

Single Sealed Servo Sub Flatpack. Cut using high quality MDF. Price is per single cabinet. Everything you need for your cabinets. Ready to be glued and clamped. Cut in such a fashion that the panels simply slot together (via dados/rabbets).

Additional information

Weight 45 lbs
Dimensions 17 × 17 × 11 in


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