Linear Power XO-2 crossover Owner's manual

Below you will find brief information for crossover XO-2. The crossover XO-2 is a 2-way, 12 dB active crossover utilizing a phase coherent Butterworth design and employs a self-oscillating power supply to provide isolation from the vehicle's electrical system with it's associated noises and to deliver the 30 volts necessary to operate the circuitry involved.

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MODEL XO-2&copy;
(1995-MSRP $199.00)
OWNER'S MANUAL AND
INSTALLATION GUIDE
INTRODUCTION
The LINEAR POWER™ XO-2&copy; has been engineered to include many features
that will combine to make it a versatile and desirable foundation for multiple
amplifier systems. The advantages of Bi-amp and Tri-amp systems have been
demonstrated for years, with the most important being a dramatic reduction in
intermodulation distortion and an increase in efficiency of about 3dB. Not only
does the XO-2&copy; provide the 12dB per octave roll off for both low and high pass
filters, it also allows separate low and high adjustment with infinitely variable
controls that operate over a range of 34 to 5000 Hertz. This will allow the installer
to tailor the response of the system at the crossover point to best suit the needs.
The low pass output of the XO-2&copy; can be configured to provide either
conventional stereo, or bridged mono output for use with subwoofer systems.
All this is accomplished with no external programming parts. The XO-2&copy; is selfcontained and can be programmed to perform any of its functions with simple
screwdriver adjustments.
TECHNICAL DESCRIPTION
The Linear Power™ XO-2&copy; is a 2-way, 12 dB active crossover utilizing a phase
coherent Butterworth design and employs a self-oscillating power supply to
provide isolation from the vehicle’s electrical system with it’s associated noises
and to deliver the 30 volts necessary to operate the circuitry involved.
Both high pass and low pass crossover points are continuously variable, allowing
under lapping or overlapping for custom tapering of system frequency response.
Overlapping has the effect of increasing energy between the crossover points.
For example, with the low pass point set to 100Hz and the high pass point set to
50Hz, there will be a 3dB peak at around 60Hz. Under lapping can produce a
notch of moderate to extreme depth, which can be used to get rid of mid-bass
&copy; 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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boominess typical of car environments.
The low pass outputs can be selected as either stereo or bridged-mono for
convenience. In mono mode, the outputs of the low pass filters are summed
together and the left channel output is inverted. This setting allows for the use of
amplifiers which are not internally configurable for bridged-mono output mode. In
the stereo mode, both outputs are in phase with the inputs.
The XO-2&copy; is protected against reverse polarity connections to the power supply,
and will except signal inputs from a source unit of 50 to 5000 millivolts (5 volts).
The higher line levels are always recommended for the best signal-to-noise ratio
in any system.
We use double-sided fiberglass epoxy circuit boards to help keep the size down,
to insure years of trouble free operation, and to allow us to design a crossover
with incredible bandwidth without fear of oscillations or noise.
In house construction of critical components like transformers and chassis, as
well as total assembly, allows Linear Power™ to maintain uniform quality. 100%
of the finished units are tested thoroughly, and must meet the design
specifications before they earn the Linear Power™ Logo.
INSTRUCTIONS
Read the following instructions through completely. If they appear too
complicated, we recommend that you have an authorized Linear Power™
Dealer do the work.
MOUNTING
Since the XO-2&copy; does not generate any heat of it’s own, placement is not as
critical as that of an amplifier. Consideration should be given, however, that the
high and low pass adjustments are accessible during the initial setup of your
system.
The case of the XO-2&copy; is also a shield against noise. Do not remove the rubber
grommets when mounting the unit to a metal surface. This will ground the case
and create the possibility of noise being introduced to the system. The grommets
also provide for vibration isolation and should therefore not be removed.
WIRING
1.MAIN GROUND
The black ground wire should be connected to a solid ground point via a bolt or
self-tapping screw. This connection must be to a clean, unpainted metal surface,
preferably to the same point at which the amplifiers are grounded.
2.POWER
Since the current requirements of the XO-2&copy; is only 100 milliamps, the red wire
can usually be connected to the power antenna or amp turn on lead provided by
your deck. An alternate source of +12 volts would be from an accessory toggle
&copy; 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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switch connected to a power source. The red wire should not be connected to a
source of constant power as this would eventually drain the vehicle’s battery.
3.INPUTS
The RCA (phono) jacks will accommodate either high or low level signals,
ranging from 50 millivolts to 5 volts. For low-level signals, always use shielded
cable and avoid routing signal cables in the vicinity of any power wires. The
center pin of the RCA plug is always the positive signal input. Connect the right
and left inputs on the XO-2&copy; to the full range right and left outputs from the music
source or sound processor.
4.BIAMP STEREO OUTPUTS
Low Frequency:
Connect the low frequency outputs from the XO-2&copy; with shielded RCA cables to
the low amplifier.
High Frequency:
Connect the high frequency outputs from the XO-2&copy; with shielded RCA cables to
the high amplifier.
5.BIAMP BRIDGED MONO OUTPUTS
Connections are made for both high and low frequency as described above for
the stereo mode. Switch the mono-stereo switch into the “mono” position. This
setting allows the low frequency outputs to be connected to an older stereo amp
that is not internally capable of bridgeable operation. Follow the installation guide
for that amplifier for the correct speaker hook up configuration. Generally the
mono setting will only be used for subwoofer applications with the low pass
adjustment set at 150 Hertz or less. When set for mono operation, the low
frequency signals are added together, then the left channel is inverted on the
output. This works well for very low bass information, but will not be desirable at
higher frequencies where stereo separation is important. In this setting the high
frequency outputs are not altered in any way.
ADJUSTMENT
The adjustment of the XO-2&copy; low and high pass settings will be determined by
both the configuration of your overall system, and the specification of the
speakers you are using. The following is meant to provide you with a general
idea for possible adjustments. Please note that in any configuration the monostereo switch can be set for “mono” where the low frequency outputs are used to
drive ONLY a subwoofer amplifier.
BIAMP STEREO TWO-WAY SYSTEM
Low Frequency: Amplifier used for woofers.
High Frequency: Amplifier used for tweeters.
Settings: Set mono-stereo switch to “stereo”. Set crossover points at 1.2 to 4
KHz.
&copy; 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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BIAMP STEREO THREE-WAY SYSTEM
Low Frequency: Amplifier used for woofers.
High Frequency: Amplifier used for mid and tweeter.
Settings: Set mono-stereo switch to “stereo”. Set crossover points at 500 to
800Hz. Note: Passive crossovers must be used between the mid and tweeter
speakers, or coaxial speakers may be used.
BIAMP STEREO THREE-WAY SYSTEM + SUBWOOFER
Low Frequency: Amplifier used for subwoofer.
High Frequency: Amplifier used for woofer, mid, and tweeter.
Settings: Set mono-stereo switch to “stereo”. Set crossover points at 75 to
150Hz. Note: This arrangement is used where the high frequency amp is used to
drive tri-axial speakers.
TRI-AMP SYSTEM: In a tri-amp system, individual amplifiers are used for bass,
midrange, and treble frequencies. In this configuration, two XO-2’s are
“cascaded” in order to obtain the third frequency range.
All crossovers presently available for the car will cause some phase shift at the
crossover point. In a three-way system with two crossovers, there will be a phase
shift at both crossover points. By reversing the electrical phase of the midrange
driver relative to the woofer and tweeter, this phase shift will be compensated so
that the system will be acoustically in phase though electrically out of phase. In
most cases, the system will sound better with the phase of the midrange drivers
reversed. Although this sounds complicated, it is really quite simple.
After your system is installed and operating, reverse the leads to the midrange
drivers, positive (+) to negative (-) and negative to positive. Listen to the system,
then return the leads to their original position and listen again. Leave the leads
connected in whichever position achieves the best sound.
GENERAL TROUBLESHOOTING
NO SOUND
Check all connections. Check main power fuse. Check accessory fuse of your
vehicle. Check to see that +12Vdc is present at the amplifier on the power wire,
and on the red/white remote turn-on wire. Check for a solid ground connection.
Check that the main music source is putting out signal.
BLOWS FUSES
Check all connections to be sure no wires are touching each other or the chassis
of the vehicle or any other equipment in your install. Check that your speakers
are in proper working order.
&copy; 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
4
SERVICE OR REPAIR
To obtain modification, service or repair, please contact our ONLY Authorized
LINEAR POWER™ Product Service Center:
T.I.P.S. INC.
3455 Lanell lane, Pearl, MS 39208
(601) 932-8477
E-mail: [email protected]
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&copy; 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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Specifications
XO-2&copy;
Output level *(max output level 9 Volts RMS)
0 – 5 Volts Nom.
Input Impedance
150K Ohms
THD @ full output 20-20KHz
.01%
Signal to Noise Ratio
80 dB
Frequency Response
1.6 Hz to 200 KHz
Gain
Unity in the Band Pass
Channel separation
&gt;60dB
Crossover Slope
Crossover Filter Design (Phase Coherent)
12 dB per Octave
Butterworth
Crossover Points
34 Hz to 5 KHz
Current Draw
100 mA
Fuse rating
.5A
Dimensions
1 3/8”x4”x4 &frac12;”
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&copy; 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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Key features

2-way active crossover
12 dB per octave roll off
continuously variable crossover points
self-oscillating power supply
phase coherent Butterworth design
bridged mono output for subwoofer
stereo mode
adjustable crossover points
100mA current draw
protected against reverse polarity

Frequently asked questions

The XO-2 is a 2-way, 12 dB active crossover that separates audio signals into high and low frequencies for use in car audio systems. This allows individual amplifiers to be used for each frequency range, resulting in improved sound quality.

The crossover points for the XO-2 can be adjusted using a screwdriver. You can adjust the low pass from 34Hz to 5KHz and the high pass from 34Hz to 5KHz. It allows underlapping or overlapping for custom tapering of system frequency response. Refer to the instruction manual for more details.

Bi-amping and tri-amping allow separate amplifiers to handle different frequency ranges, reducing intermodulation distortion and improving efficiency. It also allows for greater control over the frequency response of the system.

The mono-stereo switch allows you to configure the low pass outputs to either be stereo or bridged-mono. The “mono” setting allows the low frequency outputs to be connected to a stereo amp that is not internally capable of bridging. The “stereo” setting provides separate outputs for each channel.

First, check all connections, including the power fuse, accessory fuse, and ground connection. Ensure that the music source is putting out a signal and that +12Vdc is present at the amplifier on the power wire and remote turn-on wire.

The XO-2 can be used with a variety of speakers, but the specific type will depend on the desired frequency response of your system. For example, you can use woofers, tweeters, midrange drivers, and subwoofers.