The Blam Relax 130RFC is an upgraded 130RC model: a pair of 130mm (5.25 inch) hi-efficiency 2-ohm 2-way coaxial speakers with composite casting frames and improved sensitivity. The mid-bass uses a coated cellulose pulp cone with butyl rubber suspension and a large motor assembly for higher sensitivity and power handling.

The soft 20 mm fabric dome tweeter uses a neodymium magnet and a 20 mm CCAW voice coil; a high-quality capacitor provides the treble crossover and mid frequencies are acoustically filtered. The speakers include built-in 6dB/octave high-pass filters and are supplied as a pair for 130 mm (5.25 inch) speaker locations.