Owner’s Guide for the B4R Bass Amplifier Made with Pride in the U.S.A.
B4R Bass Amplifier TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Important Safeguards and Precautions . . . . . . . . . . . . . . .3 The Front Panel Controls and Their Use . . . . . . . . . . . . .4,5 The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6,7 Connections: Mono Bridged . . . . . . . . . . . . . . . . . . . . . .8 Dual Mono . . .
B4R Bass Amplifier 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.
B4R Bass Amplifier The Front Panel Controls and Their Use 1. 0dB INPUT: The signal output from an instrument (active or passive – typically passive) or a line level signal may be connected here by means of a shielded instrument cable. The signal at this jack is sent into the preamp at full amplitude. 2. -15dB INPUT: The signal output from an instrument (active or passive – typically active) or a line level signal may be connected here by means of a shielded instrument cable.
B4R Bass Amplifier The Front Panel Controls and Their Use – Con’t. 12. GRAPHIC EQ: This switch activates the graphic equalizer. When a footswitch is used, this switch is disabled. 13. LIMIT DEFEAT: The B4R employs internal limiter circuits to help keep the power amplifier’s output clean at extreme volume levels. (All amplifiers may begin to clip their output signals as they approach maximum output levels, resulting in potentially speaker-damaging distortion.
B4R Bass Amplifier The Rear Panel 23. CIRCUIT BREAKER: The B4R employs an AC line circuit breaker to help protect against damage due to excessive current demands. If the amplifier stops working, check the circuit breaker. If it has opened, the button will be protruding and showing a contrasting color. You can reset the circuit breaker by pushing it in until it latches. The breaker must cool down for a short time before the button will latch.
B4R Bass Amplifier The Rear Panel – Con’t. 32. FOOTSWITCH: Connect a two button footswitch to this jack for remote Mute and EQ On/Off control. On the stereo 1/4” plug, the tip controls Mute and the ring controls EQ On/Off. When a footswitch is connected, the Mute switch (#3) can still be used; however, the EQ switch (#12) is disabled. 33.
B4R Bass Amplifier Connections: In the example shown below, the B4R’s two internal power amplifiers are bridged together to produce maximum output power. Set the Stereo/Mono Bridge switch to the IN (Mono Bridged) position and connect the system as follows: Mono Bridged 1: Connect the heavy duty mono bridge speaker cable (provided) from the B4R’s Biamp/Mono Bridge Speaker Output jack to the input jack of a speaker cabinet capable of handling the extremely high output power.
B4R Bass Amplifier In the example shown below, the B4R’s two internal power amplifiers will power both a high frequency cabinet and a low frequency cabinet. The crossover point is determined by the Frequency control (#16). Set the Stereo/Mono Bridge switch to the OUT (Stereo) position and connect the system as follows: Biamp: Highs / Lows 1: Set the Full Range/Biamp switch to the IN (Biamp) position.
B4R Bass Amplifier Some Suggested Settings ROCK: GAIN STYLE BASS ULTRA MID TREBLE STYLE BASS ULTRA MID TREBLE STYLE BASS ULTRA MID TREBLE STYLE BASS ULTRA MID TREBLE STYLE BASS ULTRA MID TREBLE MUTE Since so many variables affect the actual sound of any system, the following settings are offered as starting points to help you find the exact sounds your playing demands.
B4R Bass Amplifier Troubleshooting In the unlikely event that your B4R should malfunction, take a few minutes to troubleshoot it before you call for service. You can save yourself time and money by doing it yourself, and often the problem is something quite simple.
B4R Bass Amplifier Technical Specifications OUTPUT POWER RATING 1350 Watts Mono-Bridged @ 4 Ohms (1000 Watts Continuous) 840 Watts Mono-Bridged @ 8 Ohms (680 Watts Continuous) 2 x 675 Watts @ 2 Ohms (500 Watts Continuous) 2 x 420 Watts @ 4 Ohms (340 Watts Continuous) 2 x 255 Watts @ 8 Ohms (205 Watts Continuous) TONE CONTROL RANGE Bass: Ultra Mid: Treble: GRAPHIC EQ LEVEL GRAPHIC EQ RANGE 33Hz: 80Hz: 150Hz: 300Hz: 600Hz: 900Hz: 2kHz: 5kHz: 8kHz: SIGNAL TO NOISE RATIO FOOTSWITCH JACK ACCESSORIES POWER REQ
