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 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
• W x H x D in. 4.07 x 1.43 x 3.40
• Weight (kg / lb.) kg 0,24 / lb. 0.53