Kramer Electronics 6601 6601 is a high performance distribution amplifier for digital audio signals. It takes one input, provides reclocking and equalization and distributes the signal to four identicaloutputs. Multi-Standard - AES/EBU, IEC 958, S/PDIF, and EIAJ CP340/12101. Reclocking and Equalization - Automatic. Compact DigiTOOLS - 3 units can be rack mounted side-by-side in a 1U rack space with the optional RK-3T rack.