The Blam RS10.4 is a 250 mm 10 inch passive extra-slim subwoofer designed for sealed car audio installations. Construction includes a steel basket, injected polypropylene cone, butyl rubber surround, long life conex damper, a 50 mm voice coil on an aluminium former and a 126 mm x 15 mm motor assembly with extended T yoke.

The driver is optimized for use in 10 L to 40 L closed enclosures with varying -3 dB points and boost characteristics. Supplied accessories are a mounting screw and user manual. Nominal impedance is 4 ohm and sensitivity is 86.2 dB.