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An Introduction to your new Ampeg B4R 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, the Ampeg B4R. This versatile and powerful bass amplifier delivers up
to 1350 watts of unsurpassed musical power, and offers several outstanding features.
All of the features and controls of your B4R are covered in detail within the pages of this owner’s guide.
We recommend going over them before you use the amplifier.
Features
In the world of high performance bass amps, Ampeg amplifiers stand alone. In true Ampeg tradition, the
B4R offers you more power, performance and flexibility than any other bass amplifier in its class. The out-
standing features of your new amplifier, features which set it apart from the competition, are listed below.
• DUAL SEPARATE POWER AMPLIFIERS: Operate in true stereo or mono bridged
mode for even greater output power (page 6,8,9).
• BIAMP CAPABLE: Adjustable crossover frequency control. Low-to-high frequency
balance control (page 5,8,9).
• 5-POSITION STYLE CONTROL: Take your pick from five different tone variations to
best suit your playing style (page 4).
• TEXTURE CONTROL: Changes your tone for a more aggressive sound (page 4).
• 9-BAND GRAPHIC EQ: Switchable at front panel or with a footswitch, you can use
this as a “second channel” for bass solos, or to shape your sound to your own exact-
ing standards. An independent level control lets you adjust the Graphic EQ volume.
(page 5).
• EFFECTS MIX: Varies the amount of external effects mixed into the signal (page 4,5).
• TUNER OUT JACK: Allows connection to an electronic tuner and provides an “always
live” monitor feed even when the output is muted (page 7).
• HEAVY-DUTY SPEAKER JACKS: For more reliable connections at higher outputs
and for mono bridged connections: dual binding posts (domestic units) or Speakon
®
jacks (export units) (page 6,7).
• BALANCED AND UNBALANCED LINE OUTPUTS: Independent level control.
Balanced XLR and unbalanced 1/4” output jacks. Switchable pre or post EQ (page 7).
• EFFECTS LOOP: Connect your effects here for increased intensity and quieter oper-
ation (page 7).
• POWER AMP IN/PREAMP OUT: Two separate loops, one for each channel: a sepa-
rate preamp may be connected to the Power Amp In jack, and the Preamp Out jack
may be connected to a slave amp (page 6,7).
• FOOTSWITCH CONTROL: Use a footswitch to activate the Graphic EQ and the Mute
feature (page 6,7).
• CIRCUIT BREAKER PROTECTION: A heavy duty resettable circuit breaker provides
protection against fault conditions (page 6).
Speakon
®
is a registered trademark of Neutrik AG.
B4R Bass Amplifier