Ampeg B328, B3158 manual An Introduction to your new Ampeg Bass Amplifier, Features

B3/B328/B3158 Bass Amplifier

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Important Safeguards and Precautions . . . . . . . . . .2 The Front Panel Controls and Their Use . . . . . . .3,4 The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . .4,5 Some Suggested Settings . . . . . . . . . . . . . . . . . . .6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .7 System Block Diagram . . . . . . . . . . . . . . . . . . . . . .7 Technical Specifications . . . . . . . . . . . . .back cover

An Introduction to your new Ampeg Bass Amplifier

Thank you for making one of the best choices you will ever make for your musical career – choosing one of the finest bass amps available, an Ampeg B3/B328/B3158.

Your new bass amplifier offers many outstanding features. One hundred fifty watts of pure bass energy, total tone con- trol, and rugged construction make each a true performer’s bass amp.

Features

In the world of high performance bass amps, Ampeg amplifiers stand alone. In true Ampeg tradition, your new B3/B328/B3158 offers you more power, performance and flexibility than any other bass amplifier in its class. The outstanding features of your new amplifier, features which set it apart from the competition, are list- ed below:

•9-BAND GRAPHIC EQ: Use as a “second channel” for bass solos, or to shape the sound to your own exacting standards. An independent level control lets you adjust the Graphic EQ volume

•BALANCED LINE OUTPUTS: Independent level control. XLR type jack to patch into house consoles, mixing boards, or external power amplifiers

•EFFECTS LOOP: Connect your effects here for increased inten- sity and quieter operation

•DRIVE CONTROL: To add harmonics for tube-like overdrive

•BALANCE CONTROL (B3158 only): To fine tune the mix between the Biamp High and Biamp Low outputs

Important Safeguards and Precautions

All Ampeg products are designed for continuous safe operation, as long as common sense is used and steps are taken to help avoid certain problems. Abiding by the following rules can help prevent damage to your amplifier, yourself and others.

•The amplifier is equipped with a three-pronged AC power cord. To reduce the risk of electrical shock, NEVER remove or otherwise attempt to defeat the ground pin of the power cord.

•Connect the amplifier ONLY to a properly grounded AC outlet of the proper voltage for your amp.

•Avoid sudden temperature extremes, rain and moisture. Also, avoid sudden and intense impact. (If the unit has been subjected to any of the preceding abuses, have it looked at by an authorized service center.)

•NEVER set the amplifier on a support that might give out under its weight.

•Whenever using tall or stacked speaker cabinets, use them ONLY on a level surface. NEVER set tall or stacked cabinets on a surface with more than a five degree incline since tipping or falling could occur, possibly causing serious injuries.

•Always keep the total speaker impedance at or above the rated load.

•Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto the amplifier. Wipe it with a slightly dampened, lint-free cloth to remove dirt and film.

•Don’t use the amplifier if it has sustained damage to the chassis, controls, or power cord. Refer the unit to an authorized service cen- ter for inspection.

•Amplifiers capable of producing high volume levels are also capable of inflicting permanent hearing loss or damage, if the exposure to such levels is prolonged. Such damage is progressive and irreversible!

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CAUTION	ATTENTION	VORSICHT
RISK OF ELECTRIC SHOCK	RISQUE D'ELECTROCUTION	ELEKTRISCHE SCHLAGGEFAHR
DO NOT OPEN	NE PAS OUVRIR	NICHT OFFENEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,	ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS	VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT
DO NOT REMOVE COVER.	ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE	DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM
NO USER-SERVICEABLE PARTS INSIDE.	PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER A UN	BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.	TECHNICIEN QUALIFIE.	WARTUNGSPERSONAL ZU UBERLASSEN.

THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE UNIT AND PREVENT ACCIDEN- TAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:

WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER CORD; CONNECT ONLY TO A PROP- ERLY GROUNDED AC POWER OUTLET.

CAUTION: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

CAUTION: OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME. The chart below shows the U.S. Government Occupational Safety and Health Administration (OSHA) regulations which were in effect at the time of this publication for permissible noise exposure, per 29CRF1910, Table G-16.

SOUND LEVEL dBA	DURATION PER DAY	SOUND LEVEL dBA	DURATION PER DAY
SLOW RESPONSE	IN HOURS	SLOW RESPONSE	IN HOURS
90	8	102	1-1/2
92	6	105	1
95	4	110	1/2
97	3	115	1/4 or less
100	2

According to OSHA, any exposure in excess of those listed above could result in some hearing loss.

EXPLANATION OF	=	"DANGEROUS VOLTAGE"	"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
		"DANGER HAUTE TENSION"	= "REFERREZ-VOUS AU MANUAL D'UTILISATION"
GRAPHICAL SYMBOLS:
		"GEFAHLICHE SPANNUNG"	"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"