Ashly Electronic Amplifier none Manual de usuario descargar pdf (Pagina 28)

two fixed-response filters to form a crossover. Instead, a single state-

variable filter provides both low-pass and high-pass outputs, and a single

control adjusts the crossover frequency. Because the state-variable filter

allows complete control over all filter parameters, it is possible to tune the

response shape of the filter for the best possible summed response. As you'll

recall, response shape is determined by filter damping, and so all Ashly

crossovers feature a damping control, labeled dB, at each crossover point.

Figure 29

This state-variable filter,

representative of the filters

used in Ashly SC-series

crossovers, is an analog

computer realization of a

second-order (two pole or two

integrator) filter system.

HP OUT IP OUT

From the standpoint .of the ..sound system operator,. the Ashly filter approach

combines the one-knob frequency control convenience of the first crossover

example (fig. 27) with the summed response flexibility of the second crossover

example (fig. 28). In contrast to the bumpy response of fig. 28, Ashly cross

overs exhibit the smooth and predictable summed response curves shown below.

(a)

Figure 30. (b)

This graph plots the high-pass and

low-pass outputs of the Ashly

12dB/octave filter for 4 different

settings of the dB control. The line

marked "3" shows Butterworth

response, and is obtained by setting

the control to 3. The other curves

show the response shapes obtained by

over and underdamping the filter.

This graph shows

curves of (a)

electronically

Butterworth curves

how the response

combine when

summed. The

sum with a gentle

3dB peak, but other responses are

easily obtained; for a flat summed

response, set the dB control to 6.

(12dB per octave models only)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 39 40

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