Ashly XR-1001 Betriebshandbuch - Seite 4

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Auch für Ashly XR-1001: Betriebshandbuch (13 seiten), Broschüre (1 seiten), Betriebshandbuch (16 seiten), Technische Hinweise & Spezifikationen (2 seiten)

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Page - 4

Introduction - 2

Physical Description

XR Crossovers – 3

Connectors & Cables – 3

Physical Description - 4

Front Panel

Installation – 5

The XR 1001 is 1RU, and weighs approximately 10 pounds.

Typical Applications - 6

Troubleshooting - 7

Dimensions - 7

Specifications - 8

Warranty - 9

CAUTION: High

frequency compression

drivers may be destroyed

by the use of too low a

crossover frequency.

Make sure the range

switch is properly set.

You may want to install a

security cover if the unit

is accessible to untrained

people.

XR-1001 Front Panel

Power - Connects AC power to the unit. Power

is indicated by the frequency range LEDs.

Input Level - boosts incoming signal up to

+8dB before it reaches the filters, or attenuates

the signal to off. Maximum input level is

+23dBu. The "U" shown at the 12:00 position

indicates "unity gain" of the input section.

Crossover Frequency - This infinitely variable

control allows you to select an appropriate

crossover point. A turn clockwise raises the

crossover frequency while counterclockwise

lowers it. 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 crossover 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 powered on. The

range switch divides the frequency indicated on

the frequency control by 10 and gives a total

range of 200:1 for each control. Avoid

accidental damage to speakers by muting the

outputs before changing the range switch.

Response - adjusts the damping of the filter

affecting the response shape of the filters at the

crossover point. The dial calibrations refer to

the amount of attenuation 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 where the two filter output

signals overlap. To obtain a flat signal, or

"Linkowitz-Riley" response through the

crossover region, set the Response control to

"6". To obtain a notch at the crossover point,

turn down the response control past "6" to best

suit your needs. The purpose of this control is

to help offset the inaccuracies inherent in

Operator Manual – XR 1001 Crossover

typical loudspeakers, helping you to achieve a

flat system response.

NOTE: The Response control is not a "slope"

control. The Response control only affects filter

response shape in the immediate vicinity of the

crossover frequency; the ultimate crossover

slope is a fixed parameter.

Output Level - The output stage operates at

unity gain with the output level controls set at

"U". Max gain of the output stage is +15dB. In a

typical setup, power amplifier input level

controls should be run "full-on", with level

control being accomplished at the crossover.

Note that horn and compression driver

combinations are much more efficient than

cone speakers, often by 12 to 20dB. When

used together, you should expect a much lower

level setting for the horns to obtain proper

balance. Output mute switches allow you to

isolate individual or grouped outputs for

listening tests without affecting the settings of

any other outputs.

Clip Indicator - Ashly crossovers feature a

peak detection which monitors signal level at

several critical points. The LED will flash when

signal levels of +20dBu are reached anywhere

in the crossover. Since our crossovers have a

nominal 23dB of headroom referenced to a

standard operating level of 0dBu (.77 Volts), a

flashing LED warns you that you are only 3dB

from clipping. Since peak levels are monitored

at several points, the clip LED can be used to

isolate the source. If the LED flashes even

though all input and output levels are turned

down, the signal feed is excessive. If the LED

flashes when you turn the Input level control up

(with the outputs still turned down), the

overload is occurring in the filter sections, and

you should back the Input level down a bit. If

the LED first flashes when you turn the output

level controls up, then the overload is occurring

in the output stage. In this case, if your power

amplifier controls are at full gain, you are

probably severely overdriving your amplifier.