Welcome, Unpacking, Features | Crown 2, 3, 1 specification

Power Base Series Power Amplifiers

Power Power

Indicator Switch

POWER

OFF

Reset	Power	Access	Removable grille	5-Way Binding Post
Switch	Cord	Cover	and dust filter	Output Connectors

(Power Base–3 Only)

MODEL: POWER-BASE™ 3 12.5 AMPS		PUSH TO RESET
AC VOLTS: 120	60 Hz
MAXIMUM OUTPUT: 700 WATTS		S	TE
PER CHANNEL INTO 4 OHMS AT 1 KHz		S	S
WITH NO MORE THAN 0.1% THD.		ES	E
WITH NO MORE THAN 0.1% THD.		R	E
		P	R
	® INTERNATIONAL, INC.
ELECTRONIC EQUIPMENT
ELKHART, IN 46517	0000
MADE IN U.S.A.	0000
SERIAL NUMBER	000000

WARNING: TO

REDUCE THE RISK OF			STEREO
FIRE OR ELECTRIC		PARALLEL			BRIDGE
SHOCK, DO NOT EXPOSE		PARALLEL			BRIDGE
THIS EQUIPMENT TO		MONO			MONO
RAIN OR MOISTURE.	REG. U.S. PAT. OFF.	CAUTION: TURN
	4,330,809	CAUTION: TURN		OFF AMPLIFIER
	4,611,180	BEFORE CHANGING		THIS SWITCH!

Stereo/Mono

Switch

		CAUTION: TO PREVENT ELECTRIC
CAUTION:		SHOCK DO NOT REMOVE TOP OR BOTTOM
CAUTION:	OUTPUTS	COVERS. NO USER SERVICEABLE PARTS
THIS COVER IS NECESSARY FOR	OUTPUTS	INSIDE. REFER SERVICING TO QUALIFIED
THIS COVER IS NECESSARY FOR	CLASS 2	SERVICE PERSONNEL. DISCONNECT POWER
EFFICIENT COOLING OF THE AMPLIFIER.	OUTPUT	CORD BEFORE REMOVING REAR COVER
REMOVE ONLY TO ACCESS GAIN SWITCH.	WIRING	PLATE TO ACCESS SENSITIVITY SWITCH.
	REQUIRED.	ATTENTION: DÉBRANCHER AVANT
		D'OUVRIR.

CH-2 CH-1

	THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE COVER PLATE (ABOVE) TO ACCESS SENSITIVITY SWITCH.											BRIDGE-MONO WIRING		–	PARALLEL-MONO WIRING		+
					CH-2			CH-1				BRIDGE-MONO WIRING			PARALLEL-MONO WIRING
												1	TURN AMPLIFIER OFF.		1	TURN AMPLIFIER OFF.
			6						6			1	TURN AMPLIFIER OFF.		1	TURN AMPLIFIER OFF.
		5	6	7				5	6	7		2	SET STEREO/MONO	+	2	SET STEREO/MONO SWITCH	–
		4			8			4		8			SWITCH TO			TO PARALLEL-MONO.
BALANCED		3			9			3		9	UNBALANCED		BRIDGE-MONO.		3	ADD JUMPER (14
BALANCED		2			10			2		10	UNBALANCED	3	OUTPUT ACROSS		3	ADD JUMPER (14
INPUT WIRING		2			10	INPUT GROUND LIFT		2		10	INPUT WIRING	3	OUTPUT ACROSS			GAGE OR LARGER)
	+ TIP	1			11			1		11	+ TIP		RED TERMINALS			ACROSS RED TERMINALS.
	+ TIP	0		12	INPUT	LIFT	INPUT	0		12	+ TIP		ONLY. (CH-1		4	OUTPUT ACROSS CH-1
	– RING	GAIN			INPUT	(AFFECTS PHONE INPUTS ONLY.)	INPUT	GAIN					IS POSITIVE.)			TERMINALS ONLY.
GND	SLEEVE	GAIN				(AFFECTS PHONE INPUTS ONLY.)	(MONO)	GAIN			GND SLEEVE

Ch.2	Ch.2	Ground	Ch.1	Ch.1
Level	¼ Inch	Lift	¼ Inch	Level
Control	Phone	Switch	Phone	Control
	Input		Input

Fig. 1.1 Power Base Front and Back Panels

1 Welcome

Congratulations on choosing a Power Base amplifier. Power Base amplifiers are compact, professional ste- reo power amplifiers engineered to meet the most de- manding sound reinforcement needs. They compare very favorably to more expensive amplifiers, providing uncolored sound and signal-to-noise ratios commonly associated with recording studios.

This manual will help you successfully install and use your amplifier—we strongly recommend you read all instructions, warnings and cautions. If you plan to oper- ate in one of the two mono modes, be sure to read Sec- tion 2.2. Also for your protection, please save your bill of sale as it is your official proof of purchase.

1.1 Unpacking

Please unpack and inspect your new amplifier for any damage that may have occurred during transit. If dam- age is found, notify the transportation company imme- diately. Only you, the consignee, may initiate a claim with the carrier for damage resulting during shipment. Even if the unit arrived in perfect condition, as most do, save all packing materials so you will have them if you ever need to transport the unit. NEVER SHIP THE

UNIT WITHOUT THE FACTORY PACK.

1.2 Features

❏Rugged, professional power amplifier built for the road. Mounts in a standard 19 inch (48.3 cm) rack.

❏Crown’s patented grounded bridge circuitry gener- ates large voltage swings while avoiding electrical stress on the output stages. This results in low distortion and high reliability.

❏Front panel power switch with turn-on delay for loud- speaker protection.

❏Patented Output Device Emulation Protection (ODEP®) keeps the amplifier working when others would fail.

❏High damping factor provides superior control over low frequency drivers for a clean, accurate low end.

❏Safe with any load. Bridge-Mono and Parallel-Mono modes offer optimal load-matching performance.

❏Complete protection against shorted outputs, mis- matched loads, overheating, DC input/output and high- frequency overload; full internal fault protection.

❏Balanced phone jack inputs with internal three-position sensitivity switch. Optional XLR or barrier block input connectors are available with the MT-XLRor MT-BBac- cessories.

❏Ground lift switch is provided to isolate the chassis ground from the phone jack input ground.

❏Efficient heat sinks and self-contained forced air cool- ing system dissipate heat quickly and evenly for extra amplifier protection and greater power output.

❏Three year “No-Fault” full warranty and guaranteed specifications protect your investment.

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Crown 2, 3, 1 manual Welcome, Unpacking, Features