The music signal is sent from the source (see “music box“) into the input of a t.Racks 4×4 mini DSP (digital signal processor), which splits the input (music) signal into the appropriate frequency bands for the respective drivers (app. 40-100 hertz to the subwoofer, 100-350 hertz to the kick, 350-2,000 hertz to the mids and 2,000-20,000 hertz to the tops). Using their proprietary software, you can choose flexible cut-off frequencies and crossover points, adjust delay times between and equalise the various outputs.. quite a powerful bit of kit! The 4 outputs of the DSP are then connected to the 4 inputs of a 4-channel, 1200w car amplifier (Pioneer GM-D8704), sending the respective frequency bands to the respective channels on the amp, and further on to the drivers. The subwoofer and kick are theoretically receiving 300w each on Channel A (left and right), and the mids and tops each get their own separate power and signal from Channel B (mids left; tops right). Between the 95ah AGM gel battery (Varta LA95) and the amplifier there is an 80A fuse to help prevent any power surges.

Here is a list of components used, as well as the functions, weight and price. It’s a work in progress, and I still need to add the small bits, and the overall weights for each speaker.