Ashly 24.24M Specifications download pdf (Page 13)

Operating Manual - 24.24M Matrix Processor

of a signal. Parametric filters are best used to hunt down and eliminate problem feedback frequencies, add or remove a

characteristic "hot spot" from microphones, or clean up room resonance situations. It is well worth the time becoming

proficient with parametric EQ filters, as they offer the best solution to many EQ problems.

Protea 24.24M parametric filters have a boost/cut range of +15dB to -30dB. There is more cut than boost because

one of the more common uses for parametric filters is to dramatically cut, or "notch out", very narrow frequencies (low

bandwidth) in order to eliminate system feedback problems.

Every parametric EQ filter has a center frequency. The factory default is 1kHz, but each filter is adjustable from

20Hz to 20kHz in 1Hz steps. Carefully sweeping a narrow bandwidth filter through a problem feedback area, with just

a slight boost, is a quick way to find the exact frequency causing feedback trouble. Once the offensive frequency has

been found, cut the filter's level, and then adjust the bandwidth as narrow as possible while still eliminating the feedback

problem. Bandwidth is adjustable from about 1/64 octave to four octaves, and the lower the bandwidth (higher Q), the

less audible the filter action will be. Finding the problem frequency is relatively easy, but finding the best combination

of cut and bandwidth takes a little practice. Again, it is well worth the time getting comfortable with the notching

procedure, so that problems can be quickly addressed with a sufficient but minimal amount of corrective EQ.

All Pass filters: All pass filters have no effect on frequency amplitude, but rather are used to adjust the phase

response of the signal at a given frequency, and are often used in conjunction with a frequency-domain filter to correct

phase changes. At low frequencies, there is 0 degree phase shift, at the All Pass filter center frequency there is -180

degrees of phase shift, and at high frequencies there is -360 degrees of phase shift.

Each input channel has an EQ On/Off button for all filters, and in turn each filter band has its own bypass button.

The Flatten Curve function returns all filters to 0dB, but preserves the frequency and bandwidth of any used filters.

9.1g Noise Gate

Noise gates are used to minimize unwanted or ambient low level signal from an indi-

vidual mic input. THRESHOLD is the level above which an input signal will pass through,

and below which its signal is turned off. FLOOR is the input audio level which is still allowed

to pass through even when the gate has turned it off. ATTACK and RELEASE control the

time characteristics of the gating action. Attack sets the amount of time it takes for the gate to

open or gated signal to turn on. Release sets the time required for the gate to close back up

when the input signal falls below threshold.

9.1h Autoleveler

An Autoleveler is a dynamics processor used to automatically boost or cut a signal to a

user defined target level. TARGET LEVEL is the primary setting in an

autoleveler, as it determines the desired constant level to which an input is

boost or cut. Both basic mode and advanced mode utilize the target level

control, but basic mode simplifies setup. In BASIC MODE, target level,

action, and maximum gain are the available controls. ACTION is select-

able to gentle, normal, or aggressive, and automatically adjusts the follow-

ing controls found in advanced mode:

MAXIMUM GAIN controls the threshold below target using the fol-

lowing formula:

Thr =

Max Gain

(1/ratio - 1)

Action Ratio Hold Time Gain Incr. Rate Gain Dec. Rate

Aggressive

10:1 0 Sec 20ms/dB 5 ms/dB

Normal

4:1 1 Sec 50ms/dB 10 ms/dB

Gentle

2:1 2 Sec 100ms/dB 20 ms/dB

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 27 28

Comments to this Manuals

No comments

Ashly 24.24M Specifications Page 13

Comments to this Manuals

Related products and manuals for Processors Ashly 24.24M