Palmer Bridge 4A Plus

The BRIDGE 4A+ is a multifunctional device: each of the four channels can be used independently as an active DI box, a line isolation box, or a booster. The input combo socket accepts unbalanced and balanced signals. The outputs are designed as two transformer-balanced XLR sockets per channel (one on the front and one on the rear).

The galvanic isolation via transformer eliminates hum loops, and the ground lift switch can also be used to eliminate noise and interference that occurs with already balanced input signals. The Palmer BRIDGE 4A+ reliably eliminates any hum - and when connecting unbalanced equipment, the signal is also balanced.

If necessary, the signal level can be raised in three stages by 6dB, 12dB or 18dB. The audio over Cat output allows the signals of all 4 channels to be routed via a single Cat cable. This saves material, space, and time.

The BRIDGE 4A+ line isolation box is a universal problem solver for eliminating ground loops. Whether it's at home, at lectures, in the rehearsal room, on stage, in clubs, or at large events - the Palmer BRIDGE 4A+ ensures a clean sound without interference anywhere.

Item highlights:
For connecting devices with unbalanced or balanced outputs to PA systems
Reliably eliminates ground loop hum thanks to galvanic transformer isolation
Combo inputs, can be used with XLR connectors or 1/4" jacks
2 balanced XLR outputs per channel
Audio over Cat output (AES72 Type 5e) for forwarding all signals via a single Cat cable
Ground-lift switch for each output
Solid 19" housing, 1U
Power supply: 9-18V DC, center negative
Engineered in Germany

Product type Line isolators, DI boxes
Type active
Transformer isolated yes
Channels 4
Inputs 4
input type balanced/ unbalanced
Input connectors XLR, 6.3 mm jack
Number of outputs 4 (+ 4 parallel XLR outs + AoC)
THRU outputs/channel 0
Output type balanced
Output connectors RJ45, XLR
Output attenuation (PAD) 0 dB / 20 dB
Cabinet material sheet steel
Width 482 mm, 19 "
Depth 90 mm
Height 44 mm, 1 U
Weight 2.1 kg
Ground lift switch yes
Operating voltage 9 V - 18 V
Power consumption 2 W
Additional Features power LED, AoC output with ground lift, 6/12/18 dB gain
Ambient temperature during operation -20 - 70 °C
Relative Humidity < 80% (non-condensing)
Accessories (included) external power supply PW9V