This unit produces excellent results, with good phase coherency and a flat response across the entire frequency band.įigure 1B - 3-Way Mono LR Crossover (2 Needed for Stereo) In practice, normal component tolerances cause surprisingly small errors, but matching the capacitors is recommended.įigure 1B shows the way to connect a 3-Way crossover. While small variations between channels will not be audible, if the high and low pass sections are not accurately matched, then phase and amplitude errors will result. It is important with both versions that the filters are properly matched, both within the individual filters, and between channels.
Note that the frequency shown here is simply an example - it can be anything you like within the audio range.įigure 1A - Stereo Version of a 2-Way LR Crossover This unit will provide a completely flat frequency response across the crossover frequency, with the signal from both filters remaining in phase at all times. With the component values shown, these have a crossover frequency of 310Hz (refer to the article on Bi-Amping to see the reason for my choice of frequency).
ELECTRIC CROSSOVER FULL
The suggested power supply is the P05 Rev-B, which also has an auxiliary output suitable for operating muting relays (see below for reasons you may want to include muting).įigure 1A shows the general concept for a full stereo version, with two identical filter sections (but without balanced inputs). Each output buffer is configured for variable gain to allow your system to be set up correctly. Please note that the PCB version of the P09 crossover is a stereo 2-way design, and has balanced input buffers (which can be connected as unbalanced if preferred), high and low pass filters, level controls and output buffers for each channel. Photo of Completed P09 Rev-B Circuit Board (Rev-C Looks Almost Identical) With good opamps, it's performance will generally be better than (supposedly) equivalent DSP (digital signal processor) implementations, because there's no requirement to convert the signal from analogue to digital and back again. This has been a very popular project since it was published, and that popularity continues to this day. The design is adaptable to 2-way or 3-way (or even 4-way) operation, and all formulas are provided below (or use the ESP-LR component calculator program). The Linkwitz-Riley filter featured here has (almost) perfect phase-coherency, with no peaks or dips at the crossover frequency.
(See Also Project 81 for details of the 12dB/octave version). PCBs (revision C) are available for this project.
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