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Roland AC90 Manual

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Roland AC90Roland AC-90 45Wx2 Acoustic Chorus Guitar Combo Amp Black
AC90 Acoustic Chorus Guitar Amplifier Portable Carrying Case Included Amplifiers & Cabinets The Roland AC90 Acoustic Chorus Guitar Amplifier comes loaded with high-performance neodymium speakers and 90W of power. The 2-way stereo speaker system delivers transparent highs and kicking lows. The AC-90 comes with a long history of Roland excellence at its back. This amp is the latest addition to a legacy of quality products designed to give performers that reliable boost they need. The new anti-... Read more

Part Numbers: AC-90, AC90, ac-90
UPC: 0761294404843, 761294404843
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doc0 Page 1 Tuesday, May 15, 2007 2:37 PM
Owners Manual Bedienungsanleitung Guide dutilisation Manuale dell'utente Manual del usuario Manual do proprietrio Gebruikershandleiding
Thank you, and congratulations on your choice of the Roland AC-90 Acoustic Chorus.
Before using this unit, carefully read the sections entitled: IMPORTANT SAFETY INSTRUCTIONS (page 2) USING THE UNIT SAFELY (page 34) IMPORTANT NOTES (page 5)
These sections provide important information concerning the proper operation of the unit. Additionally, in order to feel assured that you have gained a good grasp of every feature provided by your new unit, Owners manual should be read in its entirety. The manual should be saved and kept on hand as a convenient reference.
Copyright 2007 ROLAND CORPORATION All rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION. Page 2 Tuesday, May 15, 2007 2:37 PM
WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.


The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
WARNING - When using electric products, basic precautions should always be followed, including the following: 1. 2. 3. 4. 5. 6. 7. 8. Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with a dry cloth. Do not block any of the ventilation openings. Install in accordance with the manufacturers instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
For the U.K. IMPORTANT: THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE. BLUE: NEUTRAL BROWN: LIVE As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK. The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED. Under no circumstances must either of the above wires be connected to the earth terminal of a three pin plug.

For everyday cleaning wipe the unit with a soft, dry cloth or one that has been slightly dampened with water. To remove stubborn dirt, use a cloth impregnated with a mild, non-abrasive detergent. Afterwards, be sure to wipe the unit thoroughly with a soft, dry cloth.
Never use benzine, thinners, alcohol or solvents of any kind, to avoid the possibility of discoloration and/or deformation.
Although the LEDs are switched off when the POWER switch is switched off, this does not mean that the unit has been completely disconnected from the source of power. If you need to turn off the power completely, first turn off the POWER switch, then unplug the power cord from the power outlet. For this reason, the outlet into which you choose to connect the power cords plug should be one that is within easy reach and readily accessible.

Additional Precautions

Use a reasonable amount of care when using the units buttons, sliders, or other controls; and when using its jacks and connectors. Rough handling can lead to malfunctions.


When connecting / disconnecting all cables, grasp the connector itselfnever pull on the cable. This way you will avoid causing shorts, or damage to the cables internal elements.
Using the unit near power amplifiers (or other equipment containing large power transformers) may induce hum. To alleviate the problem, change the orientation of this unit; or move it farther away from the source of interference.
A small amount of heat will radiate from the unit during normal operation.
This device may interfere with radio and television reception. Do not use this device in the vicinity of such receivers.
To avoid disturbing your neighbors, try to keep the units volume at reasonable levels. You may prefer to use headphones, so you do not need to be concerned about those around you (especially when it is late at night).
Noise may be produced if wireless communications devices, such as cell phones, are operated in the vicinity of this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience such problems, you should relocate such wireless devices so they are at a greater distance from this unit, or switch them off.
When you need to transport the unit, package it in the box (including padding) that it came in, if possible. Otherwise, you will need to use equivalent packaging materials.
Do not expose the unit to direct sunlight, place it near devices that radiate heat, leave it inside an enclosed vehicle, or otherwise subject it to temperature extremes. Also, do not allow lighting devices that normally are used while their light source is very close to the unit (such as a piano light), or powerful spotlights to shine upon the same area of the unit for extended periods of time. Excessive heat can deform or discolor the unit.

Some connection cables contain resistors. Do not use cables that incorporate resistors for connecting to this unit. The use of such cables can cause the sound level to be extremely low, or impossible to hear. For information on cable specifications, contact the manufacturer of the cable.
To prevent malfunction and/or damage to speakers or other devices, always turn down the volume, and turn off the power on all devices before making any connections.
When moved from one location to another where the temperature and/or humidity is very different, water droplets (condensation) may form inside the unit. Damage or malfunction may result if you attempt to use the unit in this condition. Therefore, before using the unit, you must allow it to stand for several hours, until the condensation has completely evaporated.
This instrument is equipped with balanced XLR/TRS type jacks. Wiring diagrams for these jacks are shown below. Make connections after first checking the wiring diagrams of other equipment you intend to connect.


Do not allow rubber, vinyl, or similar materials to remain on the unit for long periods of time. Such objects can discolor or otherwise harmfully affect the finish.
Do not paste stickers, decals, or the like to this instrument. Peeling such matter off the instrument may damage the exterior finish.
Once the connections have been completed (p. 11), turn on power to your various devices in the order specified. By turning on devices in the wrong order, you risk causing malfunction and/or damage to speakers and other devices. When powering up: Turn on the power to the AC-90 last. When powering down: Turn off the power to the AC-90 first.
Depending on the material and temperature of the surface on which you place the unit, its rubber feet may discolor or mar the surface. You can place a piece of felt or cloth under the rubber feet to prevent this from happening. If you do so, please make sure that the unit will not slip or move accidentally.
Wrap the AC cord around the cord hook when trans-porting or storing the unit. Page 6 Tuesday, May 15, 2007 2:37 PM




Principales caractersticas..47 Nombres de componentes y sus funciones.48 Panel de control..48 Panel trasero...52 Ejemplo de uso de dos canales combinados.54 Cmo utilizar el soporte plegable.55 Utilizacin de un soporte de altavoz.56


Main Features..7 Names of Things and What They Do..8 Control Panel..8 Rear Panel..12 Example of Using Two Channels Combined.14 How to Use the Folding Stand..15 Using a Speaker Stand..16

Portugus Page 9 Tuesday, May 15, 2007 2:37 PM
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-90s phantom power is output at a constant 48 V, so it conforms to professional specifications required at recording studios.

9. TREBLE Knobs

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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.

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.

10. CHORUS Buttons

Switch chorus on and off. When on, the indicator is lit.

6. VOLUME Knobs

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. 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.
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.
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.

8. MIDDLE Knobs

Adjust the level of the midrange. Page 10 Tuesday, May 15, 2007 2:37 PM
This is a stereo chorus that is divided into three frequency ranges. Here, the effect is separated into three bands, low-frequency, midrange, and high-frequency, and by applying the most suitable amount of chorus effect in each range, it provides a sense of fullness and breadth that is perfectly suited to the acoustic guitar. The low end is firmly in the center, and sound spreads out more and more as the sound rises from the midrange up through the higher frequencies.


* Turn the knob to OFF if you are not using anti-feedback.

14. START Button

This is used for Auto settings (p. 11). Pressing the button performs automatic detection of feedback-whine frequencies. The indicators show the operating status of the automatic detection function. Standby: Flashes slowly During Detection: Flashes rapidly After Detection: Remains lit * Holding down the START button for one second or longer returns the unit to standby for automatic detection.
While also relying on the division of sound into separate bands, this chorus offers even greater expansiveness than RICH. The sound image spreads beyond the AC-90s speakers, producing an effect that seems to envelope the listener in sound.


You can adjust this knob to switch between the reverb and delay effects. You can adjust the amount of effect applied by changing the position of the knob. * Turn the knob to OFF if you are not using the reverb or delay effect. * The markings indicating the reverb and delay positions are approximate. Listen to the sound to confirm the effect as you make adjustments.


Anti-feedback is a function that controls feedback that arises between the guitar or mic and the amp. The feedback is suppressed by attenuating the frequency at which the feedback occurs. * This is not designed to work with respect to the high-frequency feedback that can occur when using microphones. Anti-feedback can be used in two different ways; you can make use of either the Auto settings or the Manual settings. * Use either when feedback whine occurs. Feedback This is a phenomenon whereby signals output from the speakers are picked up again by the mic or pickup, and the sound is further amplified and output from the speakers, resulting in an unpleasant oscillating sound. * If the anti-feedback alone does not control the feedback, adjust your settings, for example by lowering the volume or cutting the low frequencies. * To prevent feedback during a performance, we recommend making the anti-feedback setting before the performance.


This stereo reverb, developed especially for acoustic instruments, gives a sense of spaciousness and natural sonic quality. Turn the knob to adjust the volume of the reverb effect.
This delay, developed especially for acoustic instruments, adds soft reflections to the original sound. Turn the knob to change the delay time. * You can use a foot switch (the optional BOSS FS-5U) to switch the reverb and delay on and off.


This selects the frequency at which the anti-feedback function operates. Also, the position of the knob determines whether Auto or Manual settings are selected. Page 11 Tuesday, May 15, 2007 2:37 PM
Setting the Feedback Point Automatically
This automatically detects the frequency at which feedback occurs and suppresses feedback. * Use in conditions where feedback occurs. 1. Cause feedback whine to occur. 2. Turn the FREQUENCY knob to the AUTO position.


15. MUTE Button
When you press the button, the MUTE indicator flashes, muting is turned on, and the speaker output and sounds from SUB WOOFER OUT and LINE OUT are muted. With the mute function activated, you do not need to turn down the VOLUME knob or MASTER knob to mute the noise when plugging into, or unplugging from your guitar. * Sounds from the DI OUT/TUNER OUT and PHONES jacks are not muted.
The ANTI-FEEDBACK indicator flashes slowly, and automatic detection goes into standby. 3. Press the START button. Automatic detection of the feedback point starts. The indicator flashes rapidly when detection is in progress, and when the feedback point is found, the indicator lights steadily. If no feedback point is detected, the indicator flashes slowly, and the automatic detection function returns to standby. 4. Press the START button once more to conduct the automatic detection again.

You can use a foot switch (optional BOSS FS-5U or FS-6) to switch muting on and off. (p. 13)

16. MASTER Knob

* LINE OUT cannot be adjusted.
Setting the Feedback Point Manually
1. Cause feedback whine to occur. 2. Turn the knob, moving through the range of L through H (the ANTI-FEEDBACK indicator lights up) to search for the frequency at which the feedback is to be suppressed.


17. PHONES Jack
Headphones are connected here. No sounds are output from the speakers or from SUB WOOFER OUT when headphones are connected.

18. POWER Switch

This turns the AC-90s power on and off. The POWER indicator lights up when the power is on.
Turning the knob clockwise suppresses progressively more treble feedback, and turning it counterclockwise suppresses progressively more bass feedback.
* Due to a circuitry protection feature, this unit requires a few moments after it has been turned on before it is ready for normal operation.
You can use a foot switch (the optional BOSS FS-5U, FS-6) to run automatic detection of the feedback frequency or to turn the anti-feedback function on and off.
You can use anti-feedback even when feedback is not a problem. For example, you can use it to remove undesirable resonance in the low to midrange, as well as correct other problems with the sound quality.
* Always make sure to have the volume level turned down before switching on power. Even with the volume all the way down, you may still hear some sound when the power is switched on, but this is normal, and does not indicate a malfunction.
* If you need to turn off the power completely, first turn off the POWER switch, then unplug the power cord from the power outlet. Refer to Power Supply (p. 5)
Adjusts the overall volume level.
By connecting a tuner (optional) to DI OUT/TUNER OUT and then pressing the MUTE button, you can tune your instrument without the sound being output from the speakers.
This switches the Mute function on and off. Page 12 Tuesday, May 15, 2007 2:37 PM

Rear Panel



Drum Machine Mute On/Off Anti-Feedback
CD Player Powered Sub Woofer White
Mixer Tuner Recorder 926a * When connection cables with resistors are used, the volume level of equipment connected to the inputs may be low. If this happens, use connection cables that do not contain resistors.

Chorus On/Off

Reverb/Delay On/Off

1. LINE OUT Jacks

You can connect a mixer, recording device, or other device here. The output level is +4 dBu. Included here are XLR connectors (L/R: stereo output) and a 1/4 phone jack (mono output).


You can connect a powered subwoofer to play back sounds with an even punchier, more powerful low end. The volume is adjusted with the MASTER knob.

3. AUX IN Jacks

You can connect a CD player, drum machine, or other device and play back sounds in stereo. Both RCA phono jacks and 1/4 phone jacks are provided. When connected to only the left 1/4 phone jack, playback is in mono. Although the input from AUX IN is output from the speakers, PHONES, and SUB WOOFER OUT, it is not output from LINE OUT. The volume is adjusted with the MASTER knob, and muting on/off for these sounds is controlled with
* You cannot adjust the volume for LINE OUT with the MASTER knob. * The chorus effects are designed so they exhibit the greatest effectiveness when you use the units built-in speakers. Effectiveness may differ when LINE OUT is used instead of the built-in speakers. Page 13 Tuesday, May 15, 2007 2:37 PM
the MUTE button. If devices are connected to both the RCA phono jacks and the 1/4 phone jacks, the two inputs are mixed.


Connecting a foot switch pedal (optional BOSS FS-5L, FS-5U, or FS-6) using a connection cable (the optional PCS-31) makes it possible to use a latch-type foot switch (the FS-5L or FS-6) to switch muting on and off, or to use a momentary-type foot switch (the FS-5U or FS-6) to control the anti-feedback feature. * For information on the settings for the FS-6, refer to the owners manual for the FS-6.


The direct sound of the device or instrument connected to the GUITAR or MIC/LINE channel is output here. This is a 1/4 phone TRS jack with balanced output. You can also use this jack to connect a tuner.


* If balanced output is not required, use a 1/4 phone (mono) plug to connect to this jack.
If balanced output is not required, you can use the special connection cable (the optional PCS-31) to use the DI OUT and TUNER OUT simultaneously.


* The MUTE button should be set to off when a foot switch is connected for muting. You cannot switch the muting off by pressing the foot switch when the MUTE button is on (when the MUTE indicator is lit). * When using an FS-5U (momentary type) to switch muting on and off, the muting is switched on only while the switch is held down. For anti-feedback, a foot switch will function as follows: When the FREQUENCY knob is positioned in the range from L to H, the switch turns the anti-feedback function on and off. When the FREQUENCY knob is positioned at AUTO, the switch functions as the START switch for the automatic detection. Holding the foot switch down for one second or longer returns the automatic detection function to standby mode.

Tuner Recoreder

A phase-inverted signal is output from the COLD side (the red side of the PCS-31). Connect the recording device to the HOT side (the white side of the PCS-31)

5. FOOT SW Jacks

The AC-90 accepts the BOSS FS-5L (latch type), BOSS FS-5U (momentary type), and BOSS FS-6 foot switch pedals. * Set the polarity switch as shown below.


Using a special connection cable (the optional PCS-31) to connect two foot switches (the optional BOSS FS-5U), you can use one FS-5U to switch the chorus on and off, and use the other FS-5U to switch the delay or reverb on and off.


When a 1/4 phone (mono) plug is used to connect only one foot switch, only the chorus on/off function is enabled. * The chorus on/off function works on both channels. * You cannot switch the chorus on and off by pressing the foot switch when the CHORUS button is off.


When a 1/4 phone (mono) plug is used to connect only one foot switch, only the Mute on/off function is enabled. In such cases, you should use a latch-type foot switch pedal (such as the BOSS FS-5L) Page 14 Tuesday, May 15, 2007 2:37 PM
Example of Using Two Channels Combined
When Using a Mic and a Pickup
GUITAR CHANNEL: Piezo or Magnetic Pickup MIC/LINE CHANNEL: Condenser or Dynamic mic (SELECT button = MIC) This allows you to blend the fat midrange of the pickup with the mics delicate high end. Set the PHANTOM switch to ON if using a condenser mic.


Condenser mic or Dynamic mic

When Using Two Guitars

GUITAR CHANNEL: Guitar 1 Guitar 2 Piezo or Magnetic Pickup Magnetic Pickup (SELECT button = LINE)

Guitar 1

MIC/LINE CHANNEL: You can switch guitars without having to readjust the volume and tone.

Guitar 2

When Using One Guitar with Two Types of Pickups
GUITAR CHANNEL: PiezoPickup (PICKUP button = PIEZO) MIC/LINE CHANNEL: Magnetic Pickup (SELECT button = LINE) You can balance the volume levels using each channels VOLUME knob, and adjust the tone for each pickup to attain the optimal sound with the equalizer (BASS/MIDDLE/TREBLE) knobs. Page 15 Tuesday, May 15, 2007 2:37 PM
How to Use the Folding Stand
When using the AC-90 on floors, or in other low-lying positions, then setting up and using the folding stand can make it easier to hear the sound from the speakers.


When using the folding stand, always be sure to place it so the AC-90 remains level. When not using the folding stand, fold it up.

Folding stand

Never lift up and carry the AC-90 by holding the folding stand. Never place any objects on top of the AC-90 when using the folding stand. Also, never sit or lean on the folding stand. When folding the folding stand, be careful not to pinch your fingers. Page 16 Tuesday, May 15, 2007 2:37 PM

Using a Speaker Stand

By using a speaker stand, you can mount the AC-90 at the optimal height for use as a monitor speaker or simple PA device.
The AC-90 is designed to be used only with speaker stands whose dimensions meet the specifications described below. Do not use it with a speaker stand that does not meet the following specifications.


Before use, adjust the speaker stand to a height of 140 cm (55-1/8) or less and a leg spread of 120 cm (47-1/4) or more, as shown in the figure below.


Diameter: 3.8 cm


140 cm or less


Leg spread: 120 cm or more


120 cm or more


Using a speaker stand that does not meet the specifications at left or that is adjusted to a height over
Diam eter: 136 c (53-9 m or mo r
140 cm (55-1/8), or a leg spread of less than 120 cm (471/4) may result in damage to equipment or injury due to
the stand tipping over. When using the AC-90 with a speaker stand, the speaker stand must be carefully placed so it is level and sure to remain stable. Cables connected to the AC-90 should be given enough Page 77 Tuesday, May 15, 2007 2:37 PM

Block Diagram

















How to Use the Carrying Case
When you store the AC-90 in the carrying case, put the plug of the AC cord in the side pocket.

fig.102.eps Page 78 Tuesday, May 15, 2007 2:37 PM


Rated Power Output

45W + 45W

Nominal Input Level (1 kHz)
GUITAR Channel: -10 dBu MIC/LINE Channel: -50 / -10 dBu AUX IN: -10 dBu


GUITAR Channel Input Jack (1/4 phone type) MIC/LINE Input Jack (XLR type, 1/4 phone type) AUX IN Jacks (RCA phono type,1/4 phone type) DI/TUNER OUT Jack (1/4 TRS phone type) LINE OUT Jacks (XLR type, 1/4 phone type) SUB WOOFER OUT Jack (1/4 phone type) PHONES Jack (1/4 TRS phone type) FOOT SWITCH Jack (1/4 TRS phone type)
Nominal Output Level (1 kHz)
DI/TUNER OUT: +4 dBu LINE OUT: +4 dBu SUB WOOFER OUT: +4 dBu * 0 dBu = 0.775 Vrms


Woofer 20 cm (8 inches) x 2 Tweeter 8 cm x 5 cm (3 inches x 2 inches) x 2
AC 117 V, AC 230 V, AC 240 V (50/60 Hz)



Power Consumption

464 (W) x 303 (D) x 326 (H) mm 18-5/16 (W) x 11-15/16 (D) x 12-7/8 (H) inches


11.7 kg 25 lbs 13 oz


Carrying Case Owners Manual


Foot Switch: BOSS FS-5L (Mute On/Off), BOSS FS-5U, FS-6 Connection Cable: PCS-31
* In the interest of product improvement, the specifications and/ or appearance of this unit are subject to change without prior notice.

Comercial Fancy II S.A. Rut.: 96.919.420-1 Nataniel Cox #739, 4th Floor Santiago - Centro, CHILE TEL: (02) 688-9540


Distribuidora De Instrumentos Musicales J.E. Olear y ESQ. Manduvira Asuncion PARAGUAY TEL: (595) 21 492147
Cosmos Corporation 1461-9, Seocho-Dong, Seocho Ku, Seoul, KOREA TEL: (02) 3486-8855


Roland East Europe Ltd. Warehouse Area DEPO Pf.83 H-2046 Torokbalint, HUNGARY TEL: (23) 511011


Moon Stores No.1231&1249 Rumaytha Building Road 3931, Manama 339 BAHRAIN TEL: 942


Centro Musical Ltda. Cra 43 B No 25 A 41 Bododega 9 Medellin, Colombia TEL: (574)3812529
Audionet Distribuciones Musicales SAC Juan Fanning 530 Miraflores Lima - Peru TEL: (511) 4461388


Roland Asia Pacific Sdn. Bhd. 45-1, Block C2, Jalan PJU 1/39, Dataran Prima, 47301 Petaling Jaya, Selangor, MALAYSIA TEL: (03) 7805-3263


JUAN Bansbach Instrumentos Musicales Ave.1. Calle 11, Apartado 10237, San Jose, COSTA RICA TEL: 258-0211


Roland Ireland G2 Calmount Park, Calmount Avenue, Dublin 12 Republic of IRELAND TEL: (01) 4294444
MOCO INC. No.41 Nike St., Dr.Shariyati Ave., Roberoye Cerahe Mirdamad Tehran, IRAN TEL: (021) 285-4169

U. S. A.

Roland Corporation U.S. 5100 S. Eastern Avenue Los Angeles, CA 90040-2938, U. S. A. TEL: (323) 890 3700


Suoi Nhac Company, Ltd 370 Cach Mang Thang Tam St. Dist.3, Ho Chi Minh City, VIET NAM TEL: 9316540


AMR Ltd Ground Floor Maritime Plaza Barataria Trinidad W.I. TEL: (868) 638 6385
Roland Italy S. p. A. Viale delle Industrie 8, 20020 Arese, Milano, ITALY TEL: (02) 937-78300


Halilit P. Greenspoon & Sons Ltd. 8 Retzif Ha'alia Hashnia St. Tel-Aviv-Yafo ISRAEL TEL: (03) 6823666
As of May 1, 2007 (ROLAND)



SUMMER NAMM 2007 RELEASE Contact: Tara Callahan (323) 890-3700 x3718
Austin, TX, July 27, 2007Building on the popularity of the AC-60 Acoustic Guitar Amp, Roland announces the AC-90 Acoustic Guitar Amp. With 8-inch Neodymium speakers and a two-way speaker system for crystal clear highs and a punchy low-range, the AC-90 provides a powerful acoustic sound in a lightweight, easy to carry package. Roland Division Manager Peter Swiadon relates, The AC-90 is perfect for the solo artist or the guitarist in an ensemble act where acoustic guitar sounds often get lost or overpowered by other instruments. This new amp punches up the acoustic guitar presence on a small stage, or in an arena. Additional features include an impressive automatic Anti-feedback function, two independent channels-one with an XLR input and phantom power, Reverb/Delay for each channel, stereo multi-band chorus, a convenient on-board tilt stand and a durable carrying bag. The new AC-90 mounts easily onto any standard speaker stand.
Roland is a world leader in the design, manufacture, and distribution of electronic musical instruments, professional audio equipment, multimedia products, and music accessories. For more information, please visit us online at or website of Roland nearest to you.


Technical specifications

Full description

AC90 Acoustic Chorus Guitar Amplifier Portable Carrying Case Included Amplifiers & Cabinets The Roland AC90 Acoustic Chorus Guitar Amplifier comes loaded with high-performance neodymium speakers and 90W of power. The 2-way stereo speaker system delivers transparent highs and kicking lows. The AC-90 comes with a long history of Roland excellence at its back. This amp is the latest addition to a legacy of quality products designed to give performers that reliable boost they need. The new anti-feedback feature lets you roam the stage and never worry about that awful squawk. The on-board stereo effects provide amazing spatial depth and the lush sound of a stereo multi-band chorus; there is also a new WIDE mode.Traveling musicians will really love it as it's still very lightweight and comes with its own carrying case. It also can function as a portable PA system with the inclusion of a phantom powered microphone input; sing and play guitar with one amplifier.



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