Ampeg B1RE manual Front Panel Controls and Their Use

B1RE Bass Amplifier

The Front Panel Controls and Their Use

POWER

INPUT	GAIN	BASS	ULTRA TREBLE MASTER
			MID
PAD			LIMIT

-12dB PEAK

ON

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1.INPUT: Use this jack to connect your instrument to the amplifier by means of a shielded instrument cable.

2.-12dB PAD: This switch, when depressed, attenuates the input signal by 12dB. Attenuation allows the Gain control (#4) to be used over a larger portion of its range. If clip- ping is indicated with the Gain control near minimum, attenuation is needed.

3.PEAK: This LED illuminates when the signal level into the preamp approaches clipping. Adjust the Gain control (#4) until a strong signal from your instrument causes this LED to flash.

NOTE: If the LED flashes frequently with the Gain at a low setting, use the -12dB Pad (#2) to attenuate the input signal and readjust the Gain.

4.GAIN: Use this control to adjust the input signal level. For the best signal to noise ratio, adjust this control until the Peak LED (#3) flashes on strong signals.

5.BASS: This is the primary low frequency control which allows for 13dB of boost or 14dB of cut at 40Hz.

6.ULTRA-MID:This is the primary midrange control. Rotate the control to the left of center for a “contoured” sound (more distant, less midrange output) or to the right of center for a pronounced (more up- front) tone.

7.TREBLE: This is the primary high fre- quency control which allows for 18dB of boost or 23dB of cut at 8kHz.

8.MASTER: Set the overall output level of the amplifier with this control. The Effects Loop and Bal. Out (#18,19,22) are not affected by the Master control.

9.LIMITER: The B1RE uses an internal Optocoupler Limiter to assist in keeping the power amplifier’s output “clean” at extreme volume levels. (All amplifiers begin to clip their output signals as they approach maxi- mum output levels, resulting in distortion which may damage your speakers.) To engage the Limiter, depress the Limit switch. Whenever the amplifier is at full power, the adjacent Limit LED will flash. This is an indication that the limiter is keep- ing peak signals from clipping the output.

NOTE: Playing at full power with the Limiter off will give you increased output power, but the sound may be distorted. Use discretion when playing without the Limiter.

10.ON: This LED indicator illuminates when the POWER switch (#11) is ON.

11.POWER: This heavy-duty rocker switch applies the power to the amplifier. The amp is ON when the top of the switch is depressed, OFF when the bottom of the switch is depressed.

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