Extron electronics IN1608 xi IPCP MA 70, Руководство пользователя

Страница: 119 / 144

IN1608 xi Scaling Presentation Switcher • Internal Web Pages 111
To optimize the program volume:
1. With the amplifier turned off, connect the Variable output of the scaler to an amplifier of
appropriate size for the room and the speakers.
2. Set the amplifier input level to a moderate level (for example, the twelve o’clock position
on the amplifier dial). For amplifier and IPCP models, the amplifier input level setting is
already set.
NOTE: The twelve o’clock position on an amplifier input level is generally a
moderate level. This allows for the maximum signal to noise ratio and is easily
repeatable. The actual value of the amplifier input level varies on each amplifier.
While most amplifiers have a maximum input of +4 dBu, attenuating the amplifier
input sensitivity by 12 to 17 dB usually allows for maximum output from the scaler.
3. Connect the speakers to the amplifier, assuring that polarity is not reversed.
4. Set the program volume to full attenuation.
5. Set the output volume to 100% (default).
6. Turn on the amplifier.
7. Play program material and adjust program volume to a reasonably loud yet tolerable
level. Verify that the amplifier is not clipping.
8. If desired, set the upper soft limit on the program volume to set the maximum allowable
level. This may be 6 or 12 dB above the current level (reasonably loud), or a value that is
determined to be the loudest level allowable for the room. Verify that the amplifier is not
clipping.
9. If desired, set a minimum allowable level by setting the lower soft limit.
10. Set the mic volume to an appropriate level relative to program volume.
Bass and treble
Also known as shelving or tone controls, the bass and treble faders provide the ability to cut
or boost levels. Both faders have a range of -24 dB to +12 dB. They also includes soft limit
handles to adjust the minimum and maximum allowable range. The bass tone control corner
frequency is 100 Hz. The treble tone control corner frequency is 8 kHz.
To adjust the bass or treble:
1. Click the
Mix Controls
tab (see figure 68 ,
1
, on page 108).
2. Adjust the level using any of the following methods (
8
or
9
):
•
Click and drag the fader handle to the desired level.
•
Click in the level text field below the fader and enter a new value. Then, press the
<
Enter
> or <
Tab
> key to apply the change.
•
Click the
Up
or
Down
arrow button to the right of the level text field to respectively
increase or decrease the level in 0.1 dB increments.
3. If desired for the
Bass
or
Treble
fader, click and drag the minimum and maximum soft
limits to define new minimum and maximum values within the original range.