B20 USER`S MANUAL - Acoustic Amplification
Contents
1. 7 PANEL CONFIGURATION cress 8 SUGGESTED SETTINGS 9 10 SIGNAL FLOW 11 acoustic TAKING CARE OF YOUR BASS AMPLIFIER LOCATION To avoid deformation discoloration or more serious damage do not expose the unit to direct sunlight high temperature sources or excessive humidity POWER SUPPLY Turn the power switch off when the B20 15 not in use e The AC adapter should be unplugged from the AC outlet if the B20 will not be used for an extended period of time e Avoid plugging the AC adapter into an AC outlet that is also powering high consumption appliances such as electric heaters or televisions Also avoid using multi plug adapters since these can reduce sound quality cause operation errors and result in possible damage To avoid damage turn off the B20 power switch and all related devices prior to connecting or disconnecting cables HANDLING AND TRANSPORT Never apply excessive force to any parts e Unplug cables by gripping plugs firmly Do not pull on cables e Physical shocks caused by dropping or bumping can result in serious damage CLEANING e Clean with a dry soft cloth slightly damp cloth may be used to remove stubborn grime and dirt Never use clea2. A 2 N 2 phones 2 J 24 7 acoustic ALTERNATIVE STYLE This setting is designed for an upper end punch and edge that will cut through most any sound This style will work well with pick or fingers and will add a touch of distortion to the sound as well Make sure your instrument s volume control is up all the way Since you are adding volume you need to be careful with the actual amount of E Q you use as it can also add distortion to the sound As in all the settings above it is strictly a matter of personal taste in a achieving the sound you are looking for so experiment acoustic FEATURES 1 f k k k F 1 i i fi f i 4 4 r i i F k he acoustic Heavy weight Cloth Grill Heavy Duty Woofer for Enhanced Bass Response Easy to Read Control Panel Power Switch Rugged amp Comfortable Handle Protective Long Lasting Cover 10 wWww acousticamplification com 820 USER S MANUAL 20 WATT BASS G SIGNAL FLOW DIAGRAM INPUT 1 EQUALIZATION LOW LO MID JHI MID HIGH SIGNAL CONDITIONER PREAMP INPUT 2 SS 5 PREAMP GAIN LINE IN PREAMP CONDITIONER R 5 12 INCH 6 OHM SPEAKER
3. HEADPHONE JACK R ____25 20W POWER TS 5 NOTE SPEAKER IS DISCONNECTED WHEN HEADPHONES ARE USED SIGNAL CONDITIONER 11 B20 USER S MANUAL gt Oe ee CS 3 acoustic 5111 Thousand Oaks 91359 5111 All trademarks and registered trademarks mentioned herein are recognized as the property of their respective holders 0708 8005
4. 4 2 conductor dual bass guitar inputs Output volume level control If you are using a bass guitar with an on board preamp set its level to mid position before increasing this control otherwise distortion may occur Active low frequency control set to boost 14 dB or cut 14 dB frequencies at 60 Hz Controls the lowest fundamental frequencies to enhance warmth and deep full tones Low midrange frequency control set to boost 12 dB or cut 12 dB frequencies at 340 Hz Allows you to add thickness and body to your bass tones High midrange control set to boost 10 dB or cut 10 dB frequencies at 2 kHz Increasing this will add punch to your bass guitar s sound A high frequency control set to boost 15 dB or cut 15 dB frequencies at 10 kHz Adds or subtracts the high end attack of slap styles or picking This 3 conductor 1 8 media input jack will allow you to plug in a CD player or any other source so you can practice along To control the volume of the source adjust the output volume of the device We suggest you turn the volume all the way down then plug in and adjust the volume according to your taste 1 8 3 conductor jack for plugging in headphones When used it will disconnect the internal speaker When this jewel light is lit your amp is on and ready to be played 10 Power switch 8 www acousticamplification com 820 USER S MANUAL 20 WATT BASS G SUGGESTED TONE SET
5. ED TO SUFFICIENTLY INTENSE NOISE OVER TIME THE U S GOVERNMENT S OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION OSHA HAS CA UTION SPECIFIED THE FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES RISK OF ELECTRIC SHOCK DO NOT OPEN DURATION PER DAY HOURS G a 2 1 1 21 or less CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE CHASSIS NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL SOUND LEVEL dB 90 93 95 97 100 103 110 According to OSHA any exposure in the above permissible limits could result in some hearing loss Hearing protection must be worn when operating this amplification system in order to prevent permanent hearing loss THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF NON INSULATED DANGEROUS VOLTAGE WITHIN THE PRODUCTS ENCLOSURE THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE SERVICING INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE UNIT APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING OBJECTS FILLED WITH LIQUIDS SUCH AS VASES SHALL NOT BE PLACED ON THE APPARATUS Read all safety and operating instructions before using this product All safety and operating instructions should be kept for future reference Read and understand all warnings listed on the operating instructions Follow all operating instructions to operate this product This product should not be used near w
6. TINGS The following setting suggestions will help you find your signature tone They are designed to get you close to the sound you are looking for You take it from there BASS VOLUME LO MID HI MID HIGH INPUT 1 2 N lN PHONES ANNY Range J VAVANAV Sor w acoustic TRADITIONAL ELECTRIC BASS SETTING In this setting the amplifier will deliver a standard electric bass sound Whether you are playing rock country blues or gospel this setting will get you close If you play with a pick and want less top end attack on the notes roll off a bit of the high frequency control If it s deeper bottom you re looking for add more low and low midrange frequencies The key to achieving your own personal sound is experimentation BASS BASS VOLUME LO MID INPUT 1 INPUT 2 Setting HEAD N PHONES VAATAV acoustic FUNK SLAP SOUNDS This style of music needs a strong attack with lots of top end Usually a hollowed out middle will produce the extra top end necessary for this style of music If you are using a thumb style add a bit more low end and extra volume or less if you really hit it hard Even though this is a practice or rehearsal level amplifier it will deliver the punch and clarity that you require BASS BASS VOLUME LO MID HI MID HIGH INPUT 1 INPUT 2 Setting
7. acoustic B20 USER S MANUAL 20 WATT BASS GUITAR AMP eee acoustic FCC Statements 1 Caution Changes modifications to this unit not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment 2 Note This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures eReorient or relocate the receiving antenna eIncrease the separation between the equipment and receiver eConnect the equipment into an outlet a circuit different from that to which the receiver is connected Consult the dealer an experienced radio TV technician for help Three 3 Year Limited Warranty Subject to the limitations set forth below Acoustic hereby represents and wa
8. ater i e bathtub sink swimming pool wet basement etc Only use dry cloth to clean this product 1 2 3 4 5 6 7 Do not block any ventilation openings it should not be placed flat against a wall or placed in a built in enclosure that will impede the flow of cooling air 8 Do not install this product near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 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 Do not break the ground pin of the power supply cord 11 Only use attachments 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 exercise caution when moving 13 Unplug this apparatus during lightning storms or when unused for a long period of time 14 Care should be taken so that objects do not fall and liquids are not spilled into the unit through
9. ners such as alcohol or thinner ELECTRICAL INTERFERENCE e The B20 contains electronic circuitry that may cause interference if placed too close to radio or television receivers If this occurs move the B20 further away from the affected equipment SERVICE AND MODIFICATION e There are no user serviceable parts in the B20 Do not attempt to open the B20 or make any change to circuits or parts This will void the warranty www acousticamplification com 820 USER S MANUAL OUR MISSION The Acoustic design philosophy is simple It s simple to operate simple to maintain and its Fast Tone technology allows you to dial up great sound in an instant This way of thinking is part of every amp we make That s why many legendary bassists have used Acoustic to develop their trademark sounds If you re new to Acoustic amps we encourage you to get in tune with its rich heritage and join the long line of Acoustic users and endorsers who would never consider playing through anything else acoustic ANIP SPECIFICATIONS MODEL B20 POWER 20 Watts EQUALIZER 4 Band EQ CHANNELS 1 SPEAKER 12 DIMENSIONS 13 x 15 76 x 10 WEIGHT 31 5 lb acoustic PANEL CONFIGURATION gt gt gt BASS BASS VOLUME LOW LO MID HI MID HIGH LINE Li 1 1 1 1 1 lt Sd NZ X 5 24 NZ H NZ O O acoustic FRONT PANEL 9 1
10. rrants that the components of this product shall be free from defects in workmanship and materials including implied warranties of merchantability or fitness for a particular purpose subject to normal use and service for three 3 years to the original owner from the date of purchase Retailer and manufacturer shall not be liable for damages based upon inconvenience loss of use of product loss of time interrupted operation or commercial loss or any other incidental or consequential damages including but not limited to lost profits downtime goodwill damage to or replacement of equipment and property and any costs of recovering reprogramming or reproducing any program or data stored in equipment that is used with Acoustic products This guarantee gives you specific legal rights You may have other legal rights which vary from state to state Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you Acoustic P O Box 5111 Thousand Oaks CA 91359 5111 All trademarks and registered trademarks mentioned herein are recognized as the property of their respective holders 0807 8010 2 wWww acousticamplification com 820 USER S MANUAL 20 WATT BASS G IMPORTANT SAFETY INSTRUCTIONS EXPOSURE TO HIGH NOISE LEVELS MAY CAUSE PERMANENT HEARING LOSS INDIVIDUALS VARY CONSIDERABLY TO NOISE INDUCED HEARING LOSS BUT NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOS
11. the ventilation ports or any other openings 31254 15 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way 16 WARNING To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture 17 When a mains plug is used as the disconnect device the disconnect device shall remain readily operable acoustic CONGRATULATIONS Congratulations on your purchase of the B20 amplifier Founded as the Acoustic Control Corporation in Van Nuys California in 1969 Acoustic has been the rig of choice for many legendary touring professionals Acoustic amp users include some of music s premier rock jazz and funk bassists and many of the original Acoustic rigs are still cranking out massive tone on stages world wide Now you own a piece of the Acoustic legacy so turn it up and enjoy what pros have known about for years Welcome to Acoustic Pro s Tone e 7 acoustic B20 4 www acousticamplification com 820 USER S MANUAL 20 WATT BASS G TABLE OF CONTENTS WARRANTY 2 IMPORTANT SAFETY INSTRUCTIONS 3 TAKING CARE OF YOUR BASS 6 OUR 7 AMP SPECIFICATIONS
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