Audison SPM4 User Manual

ACCESSORIES

SPM4

4 Ch Stereo Passive Mixer

Stereo passive mixer (unpowered) featuring 4 input channels and 2
output channels, designed for active OEM multi-way systems where

each speaker is powered by one specic amplied channel. SPM4
mixes audio through 4 audio transformers specically developed to
achieve very low distortion and highly linear acoustic response.

SPM4 provides the ability to mix the midrange/woofer and tweeter

channels coming from the amplier and supply one single mid-high
channel. The Ch1(L/R) channels feature two inputs, one features an
inverting input compared to Ch2 (L/R) channels; the mixing process

often gives better results when one of the two channels undergoes

a 180° dephasing.

www.audison.eu

SPM4 is especially recommended to extend the number of inputs

of the Audison digital processors or ampliers with built-in DSP
because they feature a De-equalizer (De-Eq). In that case, any

possible non-linear acoustic emissions due to the mixing of the

pre-existing ltered channels are duly compensated.

TECHNICAL SPECIFICATIONS

Max input power W (rms) 25

Max input power W (peak) 50

Output Gain dB -3

T.H.D. (input power max)

% (1kHz)
% (10kHz)

Bandwidth Hz (-3dB) 15 ÷ 75k

Crosstalk dB (10kHz) > 55

Input impedance Ω 32

Out impedance kΩ 10

Phase inverter Ch1 (left & right)

% (100Hz)

W x H x D

Weight (kg / lb.)

mm
in.

kg
lb.

0.5

0.05

0.05

103,5 x 36,5 x 86,5

4.07 x 1.43 x 3.40

0,24

0.53

CH1+CH2

LEFT RIGHT

OUTPUT

Stereo Passive Mixer 4 Ch

LEFT

CH1

CH1

CH2 CH1 CH1 CH2

invert. invert.

CH1+CH2

D

INPUT

RIGHT

W H

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All specications subject to change without notice_15.C