Lundahl LL1538 mic input transformer: ISA modules use the very
best input transformers available
Variable input impedance: four choices of input impedance,
including the original ISA 100 value, allow you to match the preamp to
your microphone
Front panel instrument and rear panel line inputs: two ¼-inch
jack sockets on the front panel give you instant access to a
transparent DI input and TRS line inputs are available on the rear
panel too
Variable cut-off high-pass filter: 18dB/octave high-pass filter,
ideal for cutting out unwanted low-frequency sounds - with a range of
16 to 420 Hz
Rear panel balanced inserts: connect external signal processors
using ISA Two's balanced insert point with ¼-inch TRS send and receive
connections.