Audison SPM4 Stereo passive mixer (unpowered)

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.

Product Features:

• 4-Channel stereo passive mixer
• Power range:
• • 25 Watts RMS
  • 50 Watts Peak Power
• Output Gain: -3 dB
• T.H.D(max input power): %(100Hz) 0.5 / %(1kHz) 0.05 / %(10kHz) 0.05
• Bandwidth: 15 - 75k Hz (-3dB)
• Crosstalk: >55dB (10kHz)
• Input Impedance: 32 Ohms
• Out Impedance: 10 kOhms
• Phase inverter: Ch1 (L&R)