Ashly XR-2001 manual Physical Description, XR-1001 & XR-4001 Front Panels

Page - 6 Operator Manual – XR Series Crossovers

Safety Instructions – 3

Introduction – 4

XR Crossovers – 5

Connectors & Cables–5

Physical Description – 6

Front Panels

Rear Panels

Installation – 7

Typical Applications - 8

Troubleshooting - 10

Dimensions - 10

Specifications - 11

Warranty - 12

Physical Description

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

XR-1001 & XR-4001 Front Panels

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.

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 gentle 3dB peak at the crossover point where the two filter output signals overlap. To obtain a flat signal, or “Linkwitz-Riley” response, 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 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.

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.

Copyright© 2006 – Ashly Audio Inc.