Electronic Crossover Networks are used to improve the sound of a
sound system by separating the high frequency sounds from the low
frequency sounds and using a separate power amplifier and speaker
for each. This is often called Bi-Amping. Typical crossover points
range from about 500 to 3000 Hz. The Crossover Networks are also
ideal for driving a Powered Subwoofer. Typical crossover
points for subwoofers range from 40 to 150 Hz. For detailed
information on how to use our electronic crossover networks download
the users guide . Electronic crossovers
are sometimes called active crossovers. Both refer to the same
thing: line level crossovers that are used between preamp and power
Active, Passive, Tube
and Solid State
We also have passive line level crossovers; these also operate at
low level (betweeen preamp and power amp) but only use capacitors,
resistors and inductors.
Finally we have the more traditional speaker level corossovers.
Electronic / Line level crossovers
Speaker level crossovers
- XM1 Low cost, 24dB/oct, 2-way, circuit
- XM9 24db/oct filterslope, 2-way
and 3-way models available
- XM16 48 dB/oct filterslope,
2-way and 3-way models available
- XM26 24dB/oct, vacuum tube, 2-way
- XM44 24dB/oct or 48 dB/oct, 2-way,
3-way and 4-way models available
- XM46 24dB/oct Passive
line level crossover (PLLXO)
- XM66 24dB/oct Electronic
Crossover with variable crossover point !! NEW !!
- XM126 24dB/oct, vacuum tube, 2-way,
3-way and 4-way models available
- XM47 12 dB/oct speaker level
Note: The XM26, XM44, XM46, XM126 are all available with choice
of slopes of 6,12,18 and/or 24 dB/oct. The XM44 has 48 dB/oct also
All our products have a warranty of two years from the date of
purchase. If they fail for any reason, just return the unit to us
and we will fix it for free. We also have a customer satisfaction
policy. If you are not happy with your purchase, just return it to
us within 30 days of purchase, and we will send you a full refund.
We accept Paypal, MasterCard, VISA, Discover, American Express and
Checks. (how to order).
We use high quality parts only. Most resistors are 1% Metal Film,
and the filters use Polypropylene capacitors. All connectors are
gold plated. All crosovers have a standard 100/115/230VAC 50/60Hz
power supply with detachable line cord (IEC connector).
About Electronic Crossover Networks
The electronic crossover is used
to drive individual loudspeakers for separate portions of the
audio frequency spectrum. A two way crossover is used for bass
and high frequency speakers. A three way crossover is used when
driving bass, midrange and high frequency speaker. The signal
from the preamp is passed to the electronic crossover network.
The outputs of the crossover network are then connected to the
power amplifiers for the individual loudspeakers. A typical
configuration like this might have the crossover frequency set
at 300 to 1000 Hz, depending on the type of loudspeakers
used. When used with subwoofers as low frequency speakers,
the typical crossover frequency is around 100 Hz. The range is
50 to 150 Hz for most subwoofers. When the crossover frequency
is below 100 Hz there usually is no stereo information present
from the sound of the subwoofer, and a common subwoofer can be
used. The sum switch on the crossover front panel causes the
outputs of both low pass channel to be summed together. Both
outputs will have the same summed signal on them, and either one
can thus be used to drive he common subwoofer. The advantage of
a common subwoofer is more than just cost. Because there is only
one subwoofer present, often a larger unit can be chosen, with
an extended bass range.
A typical 2-way system
It is also possible to drive
more than two speakers per channel. A three-way crossover would
be used to drive a system with woofers, midranges and tweeters.
Choosing the crossover
At frequencies below the
crossover frequency the signal will go to the low-pass outputs.
At frequencies above the crossover frequency the signal will go
to the high-pass outputs. There is a region around the crossover
point where the signal will come out of both the high pass
output and the low pass output. For the crossover networks with
a slope of 24 dB/octave (XM6, XM9 and XM26) the width of this
region is about 1/2 octave. For the XM16, with a slope of 48
dB/octave, the width of this region is halved to 1/4 octave.
Figure 2 shows the frequency response of the 24 dB/octave
crossover networks (XM6, XM9 and XM26). The figure is drawn for
a crossover frequency of 100 Hz. For other crossover frequencies
the same figure applies, with the frequency scale scaled. Note
that both the high-pass response and the low-pass response are
down exactly 6 dB at the crossover point of 100 Hz. This means
that at this frequency the amplitude is exactly half. Adding the
high-pass and low-pass together sum to unity. As a matter of
fact the sum of the high-pass and the low-pass response is unity
for all frequencies. This is why the filter is called a
“constant voltage” network. It is also called a Linkwitz-Riley
Fourth order frequency response of amplitude
The frequency response of the
phase of the 24 dB/octave network is shown in figure 3. The
frequency response of the phase is the same for the high-pass
and the low-pass outputs. Note that at the crossover point the
phase shift is exactly 180 degrees.
The choice of the crossover point is a difficult one, and often
some trial and error is needed for achieving best results. With
the 24 dB/octave crossover networks a good rule of thumb is to
set the crossover point at least one-half to one octave away
from the cutoff frequency of the speaker. Thus a satellite with
a cutoff frequency of 50 Hz at the low and that is used with a
subwoofer requires a crossover frequency of 75 to 100 Hz. The
subwoofer should then also have a range extending half to one
octave above the crossover frequency. In this case, if 100 Hz
was chosen, the subwoofer should have a range of at least 200
Fourth order frequency response of phase.
The level controls on the front
of the cabinet are used to set the volume of each loudspeaker
for a proper match. There are several ways to adjust these
controls. A good way to do this is to start out by setting all
controls in the center (12 o’clock) position. Listen to some
music and adjust the controls for proper volume from each
The damping control
If a frequency generator is available, hook the generator up to
the input of the crossover. Sweep the frequency from way below
the crossover point to way above the crossover point. When the
frequency crosses the crossover point the sound should shift
from one speaker to the other, but the volume should remain the
A third way is to use a pink noise generator and a spectrum
analyzer with a good microphone. Adjust the level controls for a
flat response across the crossover point.
Sometimes the methods that use instruments result in settings
that are not quite pleasing. If that is the case try to adjust
the controls until the sound is best. After all, it is the final
sound that is important.
The damping control allows
adjusting the frequency response at the crossover point. The
damping control has maximum effect near the crossover frequency,
and almost no effect far from the crossover frequency. Figure 4
shows the frequency response for the maximum and minimum
settings. This control is only available on the XM6 and the XM9.
The damping control adjusts both high pass and low pass
simultaneously. This control is useful for fine-tuning the room
frequency response. Sometimes it happens that at the crossover
point there is a small peak or dip in the frequency response.
This is caused by the fact that at this frequency the sound is
produces by both high and low speakers simultaneously. It is
often very hard to hear this dip, but it can easily be seen if a
frequency spectrum analyzer is used.
Effect of damping control