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ProSplit – Transformer Isolated Mic Splitter


The ProSplit provides one direct output and one transformer isolated output from a single microphone. Applications include sending the direct output to the main or Front-of-House mixer, with the second isolated output being sent to a monitor or recording mixer. The direct output passes phantom power from the main mixer to the microphone for use with condenser microphones.

The ProSplit includes a ground-lift switch on the isolated output to reduce noise due to ground loops between connected equipment. For versatility the ProSplit also features an attenuator pad switch on the input that can be used to alternately connect a pre-amplified (line-level) signal to the two microphone-level ProSplit outputs.


Frequency Response 20Hz to 20kHz, ±0.25dB @ -15dBu -3dB@approx.165Hz
Total Harmonic Distortion <0.26% from 20Hz to 20kHz, -15dBu input
<0.1% from 45Hz to 20kHz, -15dBu input
0.002% Typical @ 1kHz, -15dBu input
Phase Shift <10 degrees @ 20kHz (Ref, 1kHz)
Input Impedance >1.1k Ω @ 1kHz (Typical driving source impedance is 150 Ω)
Ouput Impedance <255 Ω @ 1kHz (Typical output load impedance is 1k Ω)
Maximum Input Level -1.4dBu @ 20Hz/+3.5dBu
CMRR >105dB @ 60Hz / >80dB @ 3kHz
Insertion Loss Approximately 2dB @ 1kHz
Maximum Input Level For 1% THD -1.4dBu @ 20Hz/+3.5dBu @ 30Hz / +9.4dBu @ 50Hz
Dimensions 1.85″ H x 4.6″ W x 3.5″D (47mm x 117mm x 89mm)
Weight 0.9 lbs (0.4 kg)
Notes All measurements made from the TRANSFORMER ISOLATED MICROPHONE OUTPUT with PAD SWITCH out (off) and 150 Ω balanced source feeding MICROPHONE INPUT and 1k Ω load connedcted to TRANSFORMER ISOLATED MICROPHONE OUTPUT to simulate a typical “real world” microphone and mic preamplifier. 0dBu = 0.775VRM

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