Manual Roland AC-90 (page 9 of 80) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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Names of Things and What They Do

Phantom Power

Because they have a comparatively wider range and better

sound quality than dynamic mics, condenser mics are often

used for miking acoustic guitars. However, they require a

power source to operate. Although some condenser mics run

off batteries placed within the mic housing, in many cases a

type of power supply known as “phantom power” is

required. This power supply uses the existing mic cable to

feed power.

The AC-90’s phantom power is output at a constant 48 V, so

it conforms to professional specifications required at

recording studios.

5. SELECT Button

This switches the input level to match that of the connected

device (mic or line).

You can connect guitars with magnetic pickups when LINE

is selected with the SELECT button.

* Note that the volume is increased if the switch is set to “MIC”

when you have a line-level device connected.

6. VOLUME Knobs

(GUITAR CHANNEL)

Adjusts the volume of the GUITAR channel.

* To accommodate the lower output of piezo pickups, the volume

level when the VOLUME knob is between the 7 and 10

positions is set somewhat higher when the PICKUP button is

set to PIEZO in comparison with the MAGNETIC setting.

(MIC/LINE CHANNEL)

Adjusts the volume of the MIC/LINE channel.

* When using the AC-90 with the GUITAR channel and MIC/

LINE channel mixed, adjust the volume balance between the

two channels with the VOLUME knob.

7. BASS Knobs

Adjust the level of the low-frequency range.

8. MIDDLE Knobs

Adjust the level of the midrange.

9. TREBLE Knobs

Adjust the level of the high-frequency range.

The tone of an acoustic instrument can vary immensely from

one instrument to the next. The kind of sound required also

varies according to how an instrument is being used in a

particular ensemble. Actively use the BASS, MIDDLE, and

TREBLE knobs to adjust the tone to suit the instrument you

are using and the conditions in which it is being used.

(Example)

• When using the AC-90 with the speaker stand attached,

you may want to turn up the BASS knob so the lower

range is perceived better.

• If the sound seems too harsh, such as immediately after

changing strings, you may want to turn down the

TREBLE knob to cut back on the high frequencies.

10. CHORUS Buttons

Switch chorus on and off.

When on, the indicator is lit.

You can use a foot switch (the optional BOSS FS-5U) to

switch chorus on and off. Turning chorus on and off with the

foot switch works on both channels.

11. CHORUS Knob

Turn this knob to select among the three types of chorus

(SPACE, RICH, and WIDE).

You can adjust the amount of effect applied by changing the

position of the knob.

* This is enabled when the CHORUS button is in the ON

position.

* The markings indicating the SPACE and RICH positions are

approximate. Listen to the sound to confirm the effect as you

make adjustments.

SPACE

This is a spacially synthesized chorus. With spacially

synthesized chorus, a method available only in stereo, the

chorus effect is created by taking the sound from the right

speaker (from which the effect sound is output), and the

sound from the left speaker (which outputs the direct sound),

and then mixing them in the actual space. This creates a

greater lateral spread than that produced when the sounds

are mixed electronically, providing a more natural sense of

breadth.

AC-90_egfispd.book Page 9 Tuesday, May 15, 2007 2:37 PM

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Roland AC-90 Manual

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