The Legato 3.1 Discrete Balanced I/V Stage
Fully balanced, symmetric operation for ultra-low noise floor
Zero global feedback design
Hand (and ear) selected components for best sonic performance
Balanced and single-ended outputs can be used simultaneously
Integrated Ballsie stage is optional and can be left out or simply not powered if not needed
Gain of balanced and single-ended outputs can be set independently to match your application
All connections by direct or optional (included) terminal blocks
The Legato is a fully discrete balanced active I/V line stage with both balanced and single-ended outputs.
Designed specifically for use with our Buffalo-II DAC, the inputs of the Legato mount directly below the Buffalo's DAC chip for very short (and equal length) signal paths.
The kit part selection took many iterations with extensive listening sessions.
2.5% polypropylene (MKP) filter capacitors provide filtering in the I/V stage. Each stage has
local Panasonic FM
100uF decoupling capacitors.
Optional balanced to single-ended conversion is performed by an integrated Ballsie stage using the supplied National Semiconductor LM4562/LME49720 (a DIP-8 socket is provided for op-amp "rolling"). Gain of the Ballsie section can be independently set for custom level matching between balanced and single-ended gear.
The Legato requires between one (and up to three) ±15VDC (bipolar) power supplies. Both our linear LCBPS
shunt-regulated Placid BP
will work very well. We recommend powering with a 15V+15V transformer (available here