Multi-Frequency Second-Order Active Crossover for Subwoofers NE5532


Fig.1 – The multi-frequency second-order active crossover for subwoofers

Fig.1 – The multi-frequency active crossover

The project offers an universal solution that allows you to find and set the best cutoff frequency for an audio system’s subwoofer with no special equipment. Beyond this, in my opinion, practical listening is the best way to compare audio configurations and devices: charts, parameters and calcs are very important but they may not be respected when put into practice.

This crossover gives you the possibility to set six different cutoff frequencies: 63Hz, 80Hz, 100Hz, 125Hz, 160Hz and 200Hz. The right selection is the one that will make your audio system sound better.

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Phase shifter for bridging two amps NE5532


Fig.1 – The stereo version of the phase shifter for bridging two amps

Fig.1 – The stereo version of the phase shifter

As declared on the last post, I have published a very recent project, built after the andy-progetti website’s birth.

This circuitry is an elementary phase shifter but I think it represents the best solution for bridging two amplifiers. I don’t know if you already know the theory of bridged amplifiers, otherwise, on the Wikipedia’s website, you can find the main information about it.

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