Linear Power XO-1 Manuel de programmation

™

F O R T H E L O V E O F M U S I C

MODEL XO-1©

(1983-MSRP $149.00)

OWNER'S MANUAL AND

INSTALLATION GUIDE

ACTIVE ELECTRONIC PHASE COHERENT

CROSSOVER

INTRODUCTION

The XO-1© is a fully programmable electronic crossover, which allows a

frequency change via a replaceable resistor network. Any frequency of crossover

can be selected between 32Hz and 12,500Hz in 5% increments. The network

can be easily inserted or removed from the special "quick change" I.C. latch

socket. The XO-1© makes possible both bi-amp and tri-amp systems with a

separate channel of amplification for each driver. A signal amplifier system

requires that the amplifier reproduce the full audible frequency range and power

multiple drivers through a passive dividing network. In an active crossover

system, one amplifier channel powers only one driver and must reproduce only a

part of the frequency range. The three main advantages of an active (electronic)

crossover are;

1. That a high order of inter-modulation distortion reduction can be realized due

to non-interaction between high and low frequencies, yielding improved clarity.

2. The elimination of the passive crossover itself. The elements of the crossover

absorb power from the amplifier and may cause distortion. In addition, the

capacitors and coils of a crossover create a reactive load that is difficult for an

amplifier to drive compared to the more purely resistive load of the driver.

3. A passive crossover system requires approximately 3dB more power than an

active crossover system. In other words, an active crossover system requires half

the total power of a passive system.

LINEAR POWER™ is a trademark of Linear Power, Inc.

TECHNICAL DESCRIPTION

The XO-1© uses FET input operational amplifiers which are well known for their

reliability and freedom from slew induced distortion. The XO-1© filter stages

employ two-pole, state variable design. A unique ultrasonic converter supplies a

negative 14 volts to the circuitry which provides freedom from external electrical

interference as well as accounting for the unusually high output voltage.

A heavy aluminum extrusion and rigid endplates combine to form a rugged

unitized chassis. All construction and assembly is performed in-house and each

unit is fully tested, inspected, and re-tested before shipping.

INSTRUCTIONS

Read the following instructions completely through. If it appears too complicated,

we recommend that you have an authorized LINEAR POWER™ dealer do the

work.

IMPORTANT !!!

THE FREQUENCY CHIP MUST BE PROPERLY INSTALLED AND LOCKED

FIRMLY IN POSISTION PRIOR TO OPERATION IN ORDER TO PREVENT

THE POSSIBILITY OF SEVERE SYSTEM DAMAGE.

MOUNTING

As the XO-1© contains no user operated controls, the best mounting location is

close to the amplifiers. The XO-1© should be mounted in a position such that the

access plate (the one with no wires) can be removed for easy frequency change,

and that the output fan-outs can plug directly into the amplifiers. To prevent

electrical interference it is advisable that phono extensions be kept to the

minimum lengths necessary.

In some trunk mount applications, a good method for mounting bi-amp and tri-

amp systems is to fashion a mounting plate made of 1/2 to 1/4 inch plywood and

attach it to the back of the rear seat in the trunk. This will provide a secure base

for attaching XO-1© and amplifiers and will make drilling multiple mounting holes

through sheet metal unnecessary.

LINEAR POWER™ is a trademark of Linear Power, Inc.

WIRING

Refer to the diagrams that follow. NOTE: ALL CONNECTIONS MUST BE

ELECTRICALLY AND PHYSICALLY SOUND. AVOID RUNNING POWER

CABLES AND SIGNAL CABLES ALONGSIDE ONE ANOTHER.

1. POWER

Your XO-1© can be connected in one of several ways:

A. Connect the XO-1© red wire to the power antenna wire of the music source if

the power antenna wire is "hot" when the source is on. The power antenna wire

is turned off on some units when the antenna is raised up all the way or when the

tape selection is used. For these units, and for units with no power antenna

wires, use the alternate methods "B" or "C".

B. The XO-1© red wire can be connected along with the amplifier remote turn-on

(trigger) wire to a CS-1 current sense adaptor (available as an accessory through

an authorized LINEAR POWER dealer).

C. The XO-1© red wire can be connected through a toggle switch (current rating

is not important) to the fuse panel. IMPORTANT: THE XO-1© POWER WIRE

SHOULD NOT BE DIRECTLY CONNECTED TO A SOURCE OF POWER

WHICH WILL BE HOT EVEN WHEN THE IGNITION IS TURNED OFF, AS

BATTERY DRAIN MAY OCCUR AFTER AN EXTENDED PERIOD.

MAIN GROUND

Connect the black ground wire to a car chassis ground, preferably to the same

point at which the amplifiers are grounded.

2. INPUT

Connect the right and left inputs on the XO-1© to the right and left outputs from

the music source. If the output of the music source is high level (designed to

connect directly to a speaker) obtain a set of high level adaptor plugs from your

LINEAR POWER dealer and follow the enclosed directions.

3. OUTPUTS (BI-AMP)

Low Frequency:

Connect the right and left low frequency outputs from the XO-1© to the right and

left inputs on the low frequency amplifier. The low frequency speakers (woofers)

can then be connected to the output of the low frequency amplifier.

High Frequency:

Connect the right and left high frequency outputs from the XO-1© to the right and

left inputs on the high frequency amplifier. (See DIAGRAM A for

interconnections.)

LINEAR POWER™ is a trademark of Linear Power, Inc.

4. OUTPUTS

(Mono-bridge subwoofer)

In a mono subwoofer system, the low frequency amplifier's outputs are strapped

together (bridged) by the XO-1© to sum the power of both channels into one to

drive a single 8 ohm woofer. In this configuration, both of the speaker ground

wires are unused and should be taped and dressed away from the other wiring.

The woofer can then be connected directly across the right and left speaker

output "hot" wires from the low frequency amplifier by attaching the green wire to

the woofer positive terminal and the grey wire to the negative terminal.

Follow DIAGRAM B for high and low frequency connections and check to see

that the mono-stereo switch inside the XO-1© is in the "mono" position.

CAUTION: WHEN BRIDGING AN AMPLIFIER, THE SPEAKER IMPEDANCE

MUST NOT BE LESS THAN 8 OHMS, AND MUST NOT BE GROUNDED AT

ANY POINT.

5. OUTPUTS

(Tri-amp System)

In a tramp system, individual amplifiers are used for bass, midrange, and treble

frequencies. In this configuration, two XO-1's© are "cascaded" in order to obtain

the third frequency range. (See DIAGRAM C for interconnections.)

All crossovers that are not PHASE COHERENT will cause some phase shift at

the crossover point. In a three way system with two crossovers, there will be

phase shift at both crossover points. By reversing the electrical phase of the mid

range driver, relative to the woofer and tweeter phase, 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

mid range drivers reversed. Although this sound complicated, it is really quite

simple to do. After your system is installed and operating, reverse the leads to

your mid range drivers, so that the positive (+) lead from the amp is connected to

the negative (-) terminal on you speaker, and the negative (-) terminal to the

positive (+) lead on the amp. Listen to the system, then return the leads to their

original positions and listen again. Connect the leads in whatever position

achieved the best sound.

LINEAR POWER™ is a trademark of Linear Power, Inc.

OPERATION/ADJUSTMENT/USE

1. CROSSOVER FREQUENCY SELECTION

A. Remove the access plate on the XO-1©. IMPORTANT: IT IS NECESSARY

THAT ALL POWER TO THE SYSTEM BE TURNED OFF PRIOR TO NETWORK

REMOVAL/INSERTION.

WE REPEAT THE WARNING: DAMAGE TO YOUR SPEAKERS CAN BE

CAUSED BY REMOVING THE RESISTOR NETWORK WHEN THE SYSTEM IS

TURNED ON!

B. Release latch on socket (lever up-release, Lever down-lock).

C. Carefully insert network.

D. Lock the network in the socket. NOTE: CHECK TO SEE THAT THE "STEREO

- MONO" SWITCH IS IN THE CORRECT POSITION.

E. Access plate can now be replaced.

SYSTEM ADJUSTMENT/USE- Recheck all wiring and connections and apply

power to system. Set all tone controls to "flat" (no cut or boost) position and

adjust volume to a comfortable level. Select a variety of program material,

preferably music that you know to be fairly accurate and containing deep bass as

well as high treble passages.

Increase volume of music source to approximately 3/4 of maximum. Adjust

variable gain on bass amplifier slowly clockwise just to the point where audible

distortion becomes noticeable, then turn gain control counterclockwise slightly.

Adjust the gain control on the midrange amplifier until you obtain balance to the

bass tones. Follow the same procedure for adjusting the gain of the treble

amplifier. Proper tonal balance will require some careful listening and

readjustment.

Volume can then be controlled by the music source volume control.

CROSSOVER FREQUENCY SELECTION

Selection of the proper crossover frequency depends on the driver selected and

the way in which they are used. For subwoofer operation, crossover frequencies

between 80 and 150 Hertz are generally preferred. For use between separate

drivers of a two or three way system, there is much more variance in the potential

choice of crossover frequencies. If a tweeter, say, has a response of 1200 to

22,000 Hertz, and a woofer a response of 28 to 2400 Hertz, the overlap area

LINEAR POWER™ is a trademark of Linear Power, Inc.

would be between 1200 and 2400 Hertz (the tweeter's lower end and the

woofer's upper end). The difference between these two frequencies is ONE

octave. (Octaves are logarithmic, meaning that each octave is double the

frequency in Hertz of the previous octave. So, if 20 to 40 Hertz is the first octave,

then 40 to 80 Hertz is the second octave.) The proper crossover choice is usually

about half of the octave difference of the overlap area. In the case above, since

the overlap area is one octave, the crossover point would be at one half octave,

or 1800 Hertz.

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]

LINEAR POWER™ is a trademark of Linear Power, Inc.

SPECIFICATIONS

XO-1©

Output Level: 0 to 5 volts

Total Harmonic

Distortion: 0.05% maximum

0.01% typical

Inter-modulation Distortion: 0.01% maximum

Input Impedance: 10,000 ohms

Gain: Unity (Input = Output)

Frequency Response: +1dB 4 Hz to 250 KHz

Current Draw: 25 mA maximum

Crossover Points:

50 Hz to 6 KHz in

1/3 octave steps

Crossover Slope: 12dB per octave

LINEAR POWER™ is a trademark of Linear Power, Inc.

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