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Roland AC-90 Manual

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7
Main Features
The AC-90 is a high-performance monitor amp developed exclusively for use with acoustic instruments. It is capable of faithfully
expressing all the harmonic richness of an acoustic instrument’s sound.
Compact, High-Performance Stereo
Amp
• The finely tuned design of the cabinet is meant to
enhance the sound of acoustic instruments. Within this
cabinet, there are two 8 inch woofers, two tweeters, and
a 45 W + 45 W stereo amp—all of which were newly
designed just for the AC-90. As a result, the unit is
capable of delivering a more natural, acoustic instrument
sound across a broad range of frequencies.
• Thanks to a power amp that was designed to be as light
as possible, and the use of new materials for the woofers,
an overall reduction in the weight of the unit has been
achieved.
Features Two Independent Channels,
GUITAR and MIC/LINE
• Each channel includes a 3-band equalizer.
• GUITAR channel handles both piezo and magnetic
pickups.
• The MIC/LINE channel offers phantom power,
produced by highly reliable, dedicated 48 V output
phantom circuitry.
• Using the MIC/LINE channel for LINE input allows you
to connect guitars with magnetic pickups. You can also
use a piezo pickup (GUITAR channel) and a magnetic
pickup (MIC/LINE channel) at the same time, and mix
(blend) the sounds together.
High-Quality Digital Effects
• Three kinds of stereo chorus effects are provided. There
is the spatially synthesized “SPACE” chorus, the “RICH”
chorus (which is divided into frequency bands), and the
“WIDE” chorus (which is also divided into frequency
bands while offering even greater expansiveness).
• Includes stereo reverb developed especially for acoustic
instruments. This allows you to add a sense of
spaciousness and natural body to the sound.
• Equipped with delay effects that can produce sound
with a tonal quality that is soft and tuned specifically for
acoustic instruments.
• An optional foot switch can also be used to turn the
effects on and off.
Anti-Feedback Suppresses Feedback
• Anti-feedback features two ways to detect the feedback
point. You can use the “Manual settings,” or you can use
the “Auto settings,” which provide for the automatic
detection of the feedback point.
• You can connect an optional foot switch and use your
foot to operate this feature.
Mute Function
• The provided Mute switch makes it easy for you to mute
the sounds for the AC-90’s own speakers as well as the
sounds from LINE OUT. By using the Mute function,
you can plug in and out noiselessly at the guitar.
Furthermore, when you have a tuner connected to
TUNER OUT, the Mute function lets you tune your
instrument without outputting any sound.
• You can connect an optional foot switch and use your
foot to turn this on and off.
External Input Jacks (AUX IN)
• Includes external input jacks, allowing you to connect a
CD player, backing machine, or other device in stereo.
•These include both RCA phono jacks and 1/4” phone
jacks, making it possible to connect just about any kind
of device.
Multiple Output Connectors
• Features DI Out, which allow you to directly output the
signals input from connected instruments and mics. You
can also connect a tuner. TRS balanced output is
supported.
• Line outs feature 1/4” phone mono-output jacks in
addition to XLR connectors for stereo output. You can
use a single AC-90 for all applications.
• It also features a Subwoofer Out. Connecting a powered
subwoofer allows you to play with an even punchier,
more powerful low end.
• The amp also provides a headphones jack, which you
can use when playing during nighttime hours and when
making sound checks.
Convenient Placement Features
• Equipped with a “folding stand,” which allows you to
change the angle of the amp when using it for
monitoring purposes.
• Includes a “speaker stand adapter,” which allows you to
attach the AC-90 to a speaker stand. This makes using
the AC-90 easier when you are performing standing up,
and allows you to use the amp as a simple PA.
• Also included is a carrying case for greater portability.
AC-90_egfispd.book Page 7 Tuesday, May 15, 2007 2:37 PM
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