The ISO-2 is a passive audio isolator designed to be inserted into the signal chain to block hum and buzz caused by ground loops. The ISO-2 accepts unbalanced or balanced signals and is equally suitable for consumer electronics and professional line-level devices.

The ISO-2 can be operated as a dual input and outputs, and since the circuit is passive, no power is required. Whether an unbalanced or balanced signal is connected, the ISO-2 will automatically convert the signal depending on the type of cable and connector plugged in.



Before connection:
As with all audio gear, always ensure audio system levels are turned down or equipment turned off before making connections. This will avoid plug-in or turn-on transients from damaging more sensitive components such as tweeters.

Connect ISO-2 to system: 
The ISO-2 has two combination XLR/TRS input connectors, wired to the AES standard pin-1 ground, pin-2 hot (+), pin-3 cold (-).

Balanced or unbalanced output signal can be connected to the input of ISO- 2; the isolated outputs will always be balanced signals.

The balanced output of the ISO-2 is line level, meaning that it should be connected to the line input of a mixing console.

Suggestions about distance cable running:
Unbalanced cables are much more susceptible to noise than their balanced counterparts, keeping unbalanced cables under 8 meters (25’) in length is good practice while balanced cables can easily extend to 100 meters (300’).


The ISO-2 is equipped with output isolation transformers to eliminate hum and buzz caused by stray DC voltage and ground loops.

Computers, CD players and other consumer equipment can be noisy – this is particularly true when incorporating audio with a projector – so isolation transformers can be very useful when combating system noise.

The independent Ground Lift switches on the outputs takes this one step further by lifting pin-1 on the XLRs. Computers are often the source for noise problems in audio systems, so greater care is certainly needed to keep things quiet.


The ISO-2 is a simple passive device, designed to electronically-isolate connected line-level audio equipment without degrading the audio quality.

On the ISO-2 there are 2 inputs and 2 outputs which block DC voltage and prevent buzz and hum from ground loops. Both outputs feature individual ground lift switches to help further reduce ground loop noise.

Circuit design
Input connectors 2 Balance combo jack
( Pin-2 hot, Pin-3 cold, Pin-1 ground )
Input DC impedance 0.82KΩ
Max. input level before clipping +26dBv
Output device 2 XLR w/balance transformer isolated
Output DC impedance 1.08KΩ nominal, Transformer balance
Output level +26dBv
Frequency Response 20Hz to 20KHz +0.2 / 0 dB
Dynamic range >130dB
S/N ratio~ un-weight 20Hz to 20KHz -136dB
T.H.D~ 1KHz, 0dBv output < 0.001%
Ground/Lift switch Lift pin-1 on XLR outputs, separate
Reverse switch Channel 2 input
Construction 1.6/1.2mm steel cabinet & chassis
Surface finished Durable powder coating
Dimension(WxDxH) 124 x 78 x 46mm
Weight 0.5Kg
Shipping weight 0.6kg
Packing per carton 20pcs/13Kgs
Shipping dimension per carton 350 x 310 x 207mm