Any system’s ‘voice’ -that is, the sonic summation of all the disparate components leading up to the final sound - is unique and reflects the signature of each preamp/processor, the interconnecting cables, and the power amplifier’s sound. Unique among subwoofer designers, Richard E. Lord (the R.E.L. of REL) understands this and his input circuitry requires the use of a unique high-level cable that allows for the full system’s voice to be built forward into the final sound, joining with a REL for perfect system integration.