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録音機器 Ashly Protea System II 2.24PSのPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Ashly Protea System II 2.24PS 20 ページ。 Two/four channel graphic/parametric equalizer/system processor, full function graphic equalizer remote control
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Ratio (RAT) is the degree of attenuation to the signal above the limiter threshold point. As the ratio increases,

less signal is allowed to exceed the threshold. For example, with the ratio set at 10:1, a 10dB increase in input level

results in just a 1dB increase in output level. Thus a lower ratio is a more pleasant sounding effect, while a high ratio,

while accurately preventing signal increases, reduces the dynamic range to a point where the audio sounds unnatural.

Limiter Attack (ATT) and Release (REL) Time Controls display units in milliseconds (ms); however, the

actual units are ms per dB. For example, when the Release control is set at 100 ms, the limiter's attenuation will

release at the rate of 100 ms per dB, or viewed in another way, it would release 10dB over 1 second of time. The attack

and release time action was designed this way to achieve a more natural attack and release behavior of a constant rate

rather than time. It should be noted that fast attack and release times may distort the audio signal. This occurs in any

limiter because a fast attack or release action changes the gain rapidly which will by definition, distort the waveshape

of long wavelength (low frequency) signals. Therefore, it is recommended that longer attack and release times be used

for lower distortion.

10-segment meters on the LCD indicate amount of GAIN REDUCTION and OUTPUT LEVEL, including a

Peak LED on the output meter. As with EQ and all other audio functions, the limiter is enabled by the In/Out key.

5.3.3 HPF/LPF

The HIGHPASS and LOWPASS filters of-

fer precise frequency adjustment of two 24dB/oc-

tave filters, creating accurate visual representation

of the pass band. The frequency indicated for each

filter is the -3dB point. Use the four softkeys to

shift the frequency for each filter. To quickly shift

both filters "off" while in this menu, press the FLAT

key to the right of the display.

5.3.4 DELAY

The DELAY feature is used to time

align two or more loudspeaker sources so that

the acoustic energy created by different speakers

at different locations arrives simultaneously at

a given listening point. Adjustments are made

using Course, Medium, and Fine softkeys

displaying milliseconds, feet, and meters.

Maximum delay per channel is 1365ms. Quickly

reset Delay Time to zero by simultaneously

pressing the up and down "Course" keys.

5.3.5 METERING

Press the MORE key to access the sec-

ond menu screen. Meters display input and out-

put levels in dBu or VU, selectable in the

UserPrefs menu.

0 dBu = 0.775Vrms, and

+4 dBu = 0 VU. To maintain the highest signal

to noise ratio possible, each local channel's in-

put level should nominally be 0 dBu, or -4 VU,

allowing 20dB headroom before clipping. Each

of the four local channels also use a two-color

(green/red) LED to indicate signal present (-15

dBu) and clipping (+20dBu) for that channel.

Operating Manual - PROTEA SYSTEM II Digital Audio Products

Preset 01

OUT

Cmp/Lim OUT

100

HPF/LPF

HPF=99Hz

DELAY

OUT

630

800

Preset 01

Course

Medium

OUT

Cmp/Lim OUT

HPF/LPF

DELAY

OUT

630

800

Out

Preset 01

(VU)

+12

dB Meters

UserPrefs

-3

MIDI

-6

-9

Security

-12

10K 20K

LPF=10.0KHz

1.2K

1.6K

2.5K

DELAY TIME:

0.00 ms

Fine

0.00 ft

0.00 m

1.2K

1.6K

2.5K

Out

+12

-3

-6

-9

-12