Ampeg B4R manual Rear Panel Con’t

B4R Bass Amplifier

The Rear Panel – Con’t.

33		34		35	36	37	38	39	40	41
BI-AMP					LINE OUT			EFFECTS LOOP
				PRE/
				POST
H	LOW	LEVEL		GND		BAL.	UNBAL.	RETURN	SEND	TUNER
UT	OUTPUT			LIFT						OUT
		1+ HOT, 1–					1+ HOT, 1–
O	CHANNEL
GE +
	A									B4R
OHMS, STEREO			CH. B				CH. A
			FULL
OHMS, STEREO
UM LOAD		RANGE
					POWER AMP B		POWER AMP A		FT. SW.
S, MONO BRIDGE		BI-AMP
				POWER AMP		PREAMP	POWER AMP	PREAMP	GRAPHIC EQ/
UM LOAD
					INPUT	OUTPUT	INPUT	OUTPUT	MUTE
ER	CHANNEL	STEREO
				BIAMP HIGH			BIAMP LOW/
	A
UTS		MONO			INPUT	MONO BRIDGE INPUT
		26	27		28	29	30	31	32

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 dis- abled.

33.BIAMP HIGH/LOW OUTPUTS: When using the amplifi- er in the biamp mode, the Biamp High Out jack carries the high frequency signal and the Biamp Low Out jack carries the low frequency signal. (See pages 8 and 9.)

34.LINE OUT LEVEL: This controls the strength of the sig- nal at the Line Out jacks (#37,38) and works independently from the Master control (#14).

35.LINE OUT PRE/POST SWITCH: The signal at the Line Out jacks can be set to either Pre or Post EQ with this switch. With the switch in the OUT position, the signal at the jacks will be Pre-EQ. This is a direct output not affected by any preamp tone settings. With the switch IN, the signal is Post- EQ and is controlled and modified by the tone controls, Graphic EQ and the effects loop.

36.LINE OUT GROUND LIFT: This switch disconnects the ground pin of the line Out XLR jack (#37), which may help

reduce residual hum and buzz sometimes picked up in line out signal cables. The ground is lifted when the switch is depressed.

37,38. LINE OUT JACKS: These jacks supply a pre-Master, line level signal for connection to a house mixing board, recording console or external amplifier(s). The XLR-type jack (#37) provides a balanced signal; the 1/4” jack (#38) pro- vides an unbalanced signal. The signal level at these jacks is controlled by the Line Out Level control (#34) and is gov- erned by the Pre/Post switch (#35).

39.EFFECTS LOOP RETURN: When using external effects, connect the effect’s output into this jack using a shielded instrument cable.

40.EFFECTS LOOP SEND: When using an external signal processor, connect this jack to the input of the effect using a shielded instrument cable.

41.TUNER OUT: This jack is provided for connection to an electronic tuner and is always “live,” even when the Mute switch (#3) is engaged, allowing for “silent tuning” as well as a monitor feed which remains active when the house mix is muted.

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