Ashly XR-1001 Betriebshandbuch - Seite 6

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Page - 6

Safety Instructions – 3

Introduction – 4

XR Crossovers – 5

The XR-1001 is 1RU, and weighs 8 pounds. The XR-2001 & XR-4001 are 2RU, and weigh 11 pounds.

Connectors & Cables–5

Physical Description – 6

Front Panels

Rear Panels

Installation – 7

Typical Applications - 8

Troubleshooting - 10

Dimensions - 10

Specifications - 11

Warranty - 12

1. Power - There is a dedicated power LED on the front;

the power switch is on the back of the unit.

2. 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."

3. Crossover Frequency - This infinitely variable control

allows you to select an appropriate crossover point.

Clockwise turning 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 typically within 1/3 octave or better. If

greater accuracy is necessary, measure the actual

crossover frequency with an external device.

To allow a wider tuning range, the crossovers use a

recessed range switch for each frequency control.

LED indicators provide range status at power-on. The

range switch divides the frequency indicated on the

frequency control by 10 and gives a total range of

200:1. Avoid damage to speakers by muting the

outputs before changing the range switch.

4. Response - adjusts the damping of the filter affecting

the response shape 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

CAUTION: High frequency

compression drivers may be

gentle 3dB peak at the crossover point where the two

destroyed by the use of too low

filter output signals overlap. To obtain a flat signal, or

a crossover frequency. Make

sure the range switch is

"Linkwitz-Riley" response, set the Response control to

properly set. You may want to

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

install a security cover if the

unit is accessible to untrained

down the response control past "6" to best suit your

people.

needs. The purpose of this control is to help offset the

inaccuracies inherent in 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.

XR-1001 & XR-4001 Front Panels

Operator Manual – XR Series Crossovers

5. 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.

6. 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.