Ashly XR-2001 Kullanım Kılavuzu - Sayfa 5

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Operating Manual - XR1001, XR2001, and XR4001 Electronic Crossovers

The purpose of this control is to help offset the

inaccuracies inherent in typical loudspeakers, thereby

helping you to achieve a flat system response. If you use

a spectrum analyzer to set up your system, adjust the re-

sponse control to obtain the flattest response through the

crossover region before any equalization is applied to the

system. If adjusting by ear, we recommend an initial set-

ting of 6dB. Adjust from this point if the system appears

to have an excess or deficiency of level at the crossover

point.

NOTE: The Response control is not a "slope"

control. A 12dB/octave crossover will always have a slope

of 12dB/octave regardless of the setting of this control.

Likewise, a 24dB/octave crossover will always have a

slope of 24dB/octave. The Response control only affects

filter response shape in the immediate vicinity of the cross-

over frequency; the ultimate crossover slope is a fixed

parameter.

5.5

Output Level

The crossover's 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. Adjust

the crossover level controls for best system balance. Keep

in mind that in any multi-amplified system, the higher fre-

quency speakers tend to be more efficient. Expect to run

the higher frequency level controls at a somewhat lower

setting than the low frequency level controls to obtain

proper frequency response. Note that horn and compres-

sion driver combinations are much more efficient than cone

speakers, often by 12 to 20dB! When cones and compres-

sion drivers are used together, you should expect a much

lower level setting for the horns (all other factors being

equal) to compensate for this difference and obtain proper

balance.

Output Mute switches allow you to isolate indi-

vidual or grouped outputs for listening tests without af-

fecting the settings of any other outputs.

5.6

Clip Indicator

Ashly crossovers feature a peak detection circuit

which monitors signal level at several critical points in

the crossover: input, filters, and outputs. 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 key

circuit points, the clip LED can be used to isolate the

source of any overload. If the LED flashes even though

all input and output levels are turned down, the signal

being fed to the crossover is excessive. If the LED flashes

when you turn the Input level control up (with the out-

puts 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 con-

trols are at full gain, you are probably severely overdriving

your amplifier.