Already from a mechanical point of view the SA 91 PLUS is a true high-end component.

The 3-in-1 case is separated in 2 compartments for the left respectively right channel whereby the 3rd compartment contains the dual power supply. All in- and outputs are available in either balanced or unbalanced circuitry.

Unbalanced signals, from a CD player for example, are automatically transformed into a balanced signal. Two power amplifiers may be connected.