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SPM 4
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 specific amplified channel. SPM4 mixes audio through 4 audio transformers specifically 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 amplifier 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. SPM4 is especially recommended to extend the number of inputs of the Audison digital processors or amplifiers 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 filtered channels are duly compensated.

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TECHNICAL SPECIFICATIONS
Max input power W (rms) 25
Max input power W (peak) 50
Output Gain dB  -3
 % (100Hz)  0.5
T.H.D. (input power max)  % (1kHz)  0.05
 % (10kHz)   0.05
 Bandwidth Hz (-3dB) 15 ÷ 75k
Crosstalk  dB (10kHz)  > 55
 Input impedance  Ω  32
 Out impedance  kΩ  10
Phase inverter  Ch1 (left & right)
W x H x D  mm  103,5 x 36,5 x 86,5
 in.  4.07 x 1.43 x 3.40
Weight (kg / lb.)  kg  0,24
 lb.  0.53