The 428 ADC provides eight channels of the highest quality conversion at frequency rates of up to 192kHz.(Running at 96kHz provides 16 simultaneous digital outputs alongside the four main analogue outputs.) Digital output formats include 8 channel single/dual wire AES/EBU,8 channel SPDIF and single/dual port 8-channel ADAT lightpipe, all available on a single ADC card. Two ISA428’s can be used with a single ADC, utilising the four extra line input channels on the rear of the unit containing the optional ADC. This allows expansion from a 4-pre amp system to an 8-pre amp system – hence why we named the product “Four t(w)o Eight!”