The Audison SPM 4 - Stereo Passive Mixer (unpowered) features 4 input channels and 2 output channels, designed for active OEM multi-way systems where each speaker is powered by one specific amplified channel.
The 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.
The 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.
- Max input power - 25w RMS, 50w Peak
- Output Gain - -3 dB
- T.H.D. (input power max) - 0.5% (100Hz), 0.05% (1kHz), 0.05% (10kHz)
- Bandwidth - 15 ÷ 75kHz (-3dB)
- Crosstalk - > 55 dB (10kHz)
- Input impedance - 32 Ω
- Out impedance - 10 kΩ
- Phase inverter - Ch1 (left & right)
- W x H x D - 103.5mm x 36.5mm x 86.5mm (4.07" x 1.43" x 3.40")
- Weight - 0.24kg, 0.53 lb