Ashly XR4001, XR2001, XR1001 Controls, Power Switch, Input Level, Crossover Frequency, Response

Operating Manual - XR1001, XR2001, and XR4001 Electronic Crossovers

5.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.

5.1Power 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.

5.2Input 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.

5.3Crossover 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.

5.4Response

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. To obtain a flat signal, or “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.

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