Audison SPM4 4 Channel 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.

Specifications:

• Max input power W (rms): 25
• Max input power W (peak): 50
• Output Gain dB: -3
• T.H.D. (input power max): 
  • % (100Hz): 0.5
  • % (1kHz): 0.05
  • % (10kHz): 0.05
• Bandwidth Hz (-3dB): 15 ÷ 75k
• Crosstalk dB (10kHz): > 55
• Input impedance: 32 ohms
• Out impedance 10k ohms
• 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