Steep 24 dB/octave slope.
Outputs are always in phase.
Crossover frequency choice 10 - 20000 Hz.
Subwoofer summing option.
Gold plated RCA connectors.
No transients during turn-on or turn-off.
Fourth-order constant-voltage design.
Low-noise circuit design.
Available 2-way stereo and 2-way 3-channel.
The XM9L Electronic
Crossover Network is a fourth- order constant-voltage active crossover
design that provides both low-pass and high-pass outputs. The
slope of each output is 24 dB/octave and, 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 the low-pass
function simultaneously, guaranteeing a perfect match of the
high-pass and low-pass responses.
The XM9L is used between the audio preamplifier and power
amplifiers. The two outputs of the crossover network (one
carrying the high frequencies and the other carrying the low
frequencies) feed the inputs of two power amplifiers, one for
tweeters, one for woofers. This is a bi-amplified system (two
amplifiers per audio channel). When used with a common subwoofer
a sum switch on the front panel allows summing of the low-pass
channels. The level of each output is set with a 12 position
attenuator on the front panel. The attenuators have 1 dB steps.
The crossover frequency of XM9L Electronic Crossover Network can
easily be set by replacing the set of 2 frequency modules,
located inside the cabinet. The damping control sets the
response at the crossover point. In the center position the
response is flat. Set fully counterclockwise there is a 4 dB dip
at the crossover point and set fully clockwise there is a 5 dB
peak. This extra control enables perfect matching of the
speakers at the crossover point. When power is turned on or off,
a relay grounds the outputs of the XM9 (for about a second after
turn-on; immediately upon turn-off) to eliminate potentially
damaging transient signals at the outputs. The crossover uses
only high grade components: 1% metal- film resistors, 1%
polypropylene-film capacitors for the filter capacitors, and
four dual FET-input operational amplifiers. Gold-plated
connectors for input, output, and power make installation easy.
Available options include 24 position stepped attenuators
instead of the standard 12 position stepped attenuatorsfor level
control. These stepped attenuators are calibrated in 0.5 dB
steps and allow very accurate setting of the levels for each
output.
Balanced inputs/outputs are also available as an option.
SPECIFICATIONS:When ordering please specify the crossover frequency.
Frequency response: DC to 100 Khz, +/- 0.2 dB
Crossover frequency: 10 Hz - 20 KHz
Insertion gain: 6 dB with level controls at maximum.
0 dB with level controls in the center.
Filter slope: 24 dB/Octave
Harmonic distortion at 1 KHz: Less than 0.01%
Signal-to-noise ratio: Better than 110 dB
Input impedance: 25 K
Output load capability: 2 K min.
Output impedance: 50 Ohms typical
Maximum input voltage: 10 V peak-peak (4 V RMS)
Power supply requirement: 110VAC/ 220VAC, 0.3A (approx)
ORDERING INFORMATION:
XM9L-AA.............2-way Stereo DeLuxe with 12 position stepped attenuators
XM9L-3CHAN-AA.......3-Channel DeLuxe with 12 position stepped attenuators
XM9L-MONO-AA........2-way Mono DeLuxe with potentiometers for level control
XM9LS-AA............2-way Stereo DeLuxe, 24 position stepped attenuators instead of 12 position stepped attenuators
XM9LS-3CHAN-AA......3-Channel DeLuxe, 24 position stepped attenuators instead of 12 position stepped attenuators
XM9-FMA.......Frequency Module
XM9-A.........Single circuit board only