Lundahl High level, high impedance isolation unit, LL156X-3FXNP2C

High Level, High Impedance Ground Isolation Unit Balanced to Unbalanced Converter LL156X

The XLR inline transformer unit LL156X is designed for breaking up ground loops and for balanced-to-unbalanced conversion in mobile or stationary audio systems. The unit is magnetically shielded and contains a high impedance input transformer LL1565, with LF saturation above +22 dBU, 40 Hz.

The two ends of the unit are galvanically isolated from each other.

The LL156X is available in four versions:
LL156X-3FXNP2C Female XLR connector to 2-pole A-gauge 1/4 jack plug
LL156X-PHF3MX Female Phono (RCA) connector to male XLR connector
LL156X-3FXPHM Female XLR connector to Phono (RCA) male
LL156X-3FX3MX Female XLR connector to male XLR connector

Characteristics of built in transformer LL1565

Static resistance of primary: 1.6 k?
Static resistance of secondary: 1.3 k?
Core: Amorphous strip core
Max level: +22 dBU @ 40 Hz
No-load impedance (@20 dBU, 50Hz) 220 k? typically
Frequency response @ 0 dBU (source 600?, load 10k?) 4 Hz - 100 kHz +/- 0.5 dB
Distortion (THD, source 600?) < 0.2 % @ 50 Hz, 0 - 22 dBU
Loss across transformer, load 10k? / 100k? 2.2 dB / 0.3 dB
Isolation between windings: 1 kV R980415