Ashly XR-4001 Operating Manual - Page 4

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Operating Manual - XR1001, XR2001, and XR4001 Electronic Crossovers

CONTROLS

Every Ashly crossover has the following controls:

a Power Switch, an Input Level control, a Crossover Fre-

quency (Hz) control and Range Switch for each dividing

point, a Response (dB) control, Output Level controls

with Mute Switches, and a Peak Indicator LED. The

XR1001 and XR2001 also have a Mode Switch for se-

lecting between 2-way and 3-way operation.

5.1

Power Switch

This switch connects AC power to the rest of the

unit. You will know power is on when one of the cross-

over frequency range LED indicators is lit. If there is no

light, check to see if the unit is plugged in to a live out-

let. If there is still no light, the internal AC line fuse may

have blown. Refer the unit to a qualified service techni-

cian for fuse replacement.

5.2

Input Level

This control can boost incoming signal up to

+8dB before it reaches the filters, or attenuate the signal

so that it is fully off. Maximum input level is +23dBu.

The "U" shown at the 12:00 position indicates "unity gain"

of the input section. We recommend setting this control

at unity and controlling system levels either prior to the

crossover or at the output level controls.

5.3

Crossover Frequency

This infinitely variable control allows you to se-

lect an appropriate crossover point for your speakers.

Turning the knob clockwise moves the crossover point to

a higher frequency, while turning it counterclockwise

moves it to a lower frequency. Crossover frequencies are

marked on standard ISO 1/3 octave center frequencies

with each octave calibrated. Calibration accuracy is very

good, typically within 1/3 octave or better. If greater

accuracy than this is necessary, measure the actual cross-

over frequency with an accurate oscillator/frequency

counter.

To allow a wider tuning range, our crossovers use

a recessed range switch for each frequency control. LED

indicators provide range status as soon as the unit is pow-

ered on. The range switch divides the frequency indi-

cated on the frequency control by 10 and gives a total

range of 200:1 for each control. Avoid accidental dam-

age to speakers by muting the outputs before changing

the range switch. Carefully plan and check the frequency

range selected to each driver before sending audio sig-

nals to your speakers.

The choice of crossover frequencies depends on

the type of speakers being used, personal taste, room

acoustics, and many other factors. Experiment to see what

works best for you.

CAUTION: High frequency compression driv-

ers may be destroyed by the use of too low a crossover

frequency. Follow the driver manufacturer's recommen-

dations carefully. Make sure the range switch is properly

set. You may want to install a security cover if the unit is

accessible to untrained people.

5.4

Response

This control, found adjacent to the crossover fre-

quency control, adjusts the damping of the filter affecting

the response shape of the filters at the crossover point (see

drawing). The dial calibrations refer to the amount of at-

tenuation effected by the filter at the crossover frequency,

i.e., a setting of 3dB means that the filter's high-pass and

low-pass outputs are each "rolled off 3dB at the crossover

point". This describes Butterworth filter response, or a

gentle 3dB peak at the crossover point when the two filter

output signals overlap.

"Linkowitz-Riley" response through the crossover region,

set the Response control to "6". This attenuates each out-

put of the filter by 6dB at the crossover point (two identi-

cal signals added together yield a +6dB increase). To ob-

tain a notch at the crossover point, turn down the response

control past "6" to best suit your needs.

To obtain a flat signal, or