XM1 Electronic Crossover

Steep 24 dB/octave slope.
Crossover frequencies available: 10 - 20000 Hz.
Outputs are always in phase with each other.
Small 2" x 3" circuit board.
Fourth order constant voltage design (Linkwitz-Riley alignment).

The XM1 electronic crossover network module is a fourth order constant voltage crossover design. The module provides both low-pass and high-pass outputs. The slope of both outputs is 24 dB/octave. Because of the fourth order design the high-pass and low-pass outputs of the crossover are always in phase with each other. The crossover network is implemented as a fourth order state variable filter. This filter provides both the high-pass and low-pass function simultaneously, guaranteeing a close match of the high-pass and low-pass responses.
One crossover network is needed for each channel of a bi-amplified system. A tri-amplified system needs two networks per channel, one to separate the high frequencies from the mid-low frequencies and another one to separate the low and mid frequencies. A quad system needs 3, and so on. The filter can also be used to drive a subwoofer, where the subwoofer is shared by the two channels of the stereo system. The crossover frequency of the XM1 electronic crossover can easily be changed by changing the value of four resistors. These four resistors are mounted on an 8 pin DIP header plug for ease of change. A trimmer potentiometer on the circuit board allows for adjustment of the frequency response at the crossover frequency. A boost of up to 2 dB at the crossover frequency compensates for a dip in the response at the crossover frequency found in some systems.
The XM1 electronic crossover is built on a 2" x 3" printed circuit board of high quality glass-epoxy material, double sided plated through hole.  The crossover uses only high grade components: 1% metal film resistors, 1%  polystyrene film capacitors for the filter capacitors and three dual FET input operational amplifiers(BurrBrown OPA2134). Terminal blocks for input, output and power make for easy hookup.
Note that the XM1 requires a separate power supply, case, etc. to function. For a fully functional crossover , ready to go, see XM9, XM16, XM44, XM26, XM126.

SPECIFICATIONS: Frequency response: DC to 100 KHz, +/- 0.2 dB Crossover frequency choice: 20 Hz - 20 KHz Insertion gain: 0dB ( 1X ) Filterslope: 24 dB/Octave Harmonic distortion at 1KHz: less than 0.01% Signal to Noise ratio: better than 110dB Input impedance: 25K Output load capability: 2K min Output impedance: 100 Ohm typ Maximum input voltage: 25 V peak-peak (8.8 V RMS) Power supply requirement: dual regulated +15V and -15V @15 mA, typ. Ordering Information: XM1-A.........Electronic Crossover Board (as shown above; no case, etc included) XM1-FMA.......Frequency module only (one of these is included with XM1-a)

Please specify the desired crossover frequency when ordering.