Shure A68S, AC68, A68L specifications Optional Accessories, Specifications, f L O, 60 mv, 30 Hz

			OPTIONAL ACCESSORIES
Battery	Power	Supply	Model A68B
Output	Cable Kit		Model A68C
Locking	Panel		Model A68L
Phono Preamp			Model A68P
Rack Panel Kit			Model A68R
Stacking Kit			Model	A68S
Interconnecting		Cable	Model	A68SC
Attach6 Case			Model AC68

SPECIFICATIONS

Gain:		At	1,000 Hz. (cps).			outputs
				Low Imp.		High Imp.		High Imp.
Input				Mic.		Mic.		Aux.
Low Imp. Mic.				f 9	d b	+33	db	+60	db
	.5 mv		produces	1.4 mv		22 mv		500 mv
High		Imp. Mic.		-13	db	f l l	d b	4-38	db
	5 mv		produces	1.1 mv		18 mv		400 mv
AUX.				-35	db	-11	db	f 1 6	d b
	50 mv		produces	0.9	mv	14 mv		320 mv
				I n
					ii3f8	12889mml-
I	u ---		- \ 1-	I V				-
								U	J
			--$32	aPPnoxU
				( 5 5mm)
			O V E R ALL DIMENSIONS - FIGURE B
Frequency Response: The				frequency response is		flat &f:b	from	,30 Hz.	(cps)
to 20,000 Hz. (cps) .						2		f L O 7
Hum-Noise:			70 db below rated output.

Equivalent I n p u t Noise: 150 ohm source, 123 db below 1 volt.

I n p u t Impedance: Microphone inputs suitable for high or low impedance dynamic

and ribbon microphones. Auxiliary-50,000 ohms.

Recommended Load Impedance:	25 to	600 ohms
Low Impedance Microphone
High Impedance Microphone	20,000	ohms or greater
Auxiliary High Impedance	50,000	ohms or greater

Distortion: Less than 1% total Harmonic Distortion when low impedance micro- phone output is at 20 mv level, high impedance microphone output is at 200 mv level, and Aus. high impedance output is at 2.0 volt level.

Output	Clipping Level:
	output	Min. Clipping Level
Mic. Low		Impd.	60 mv
Mic. High		Impd.	.85 volts
Aux. High Impd.			4.0	volts
Operating Voltage :				cycle
Model M68: 105-130 volts 50/60
Models M68-2		and M68-2E:	105-130 volts 50/60 cycle or 210-240 volts 50/60
cycle.
Case:	Painted	Metal.

Dimensions: See Figure B.

Net Weight: 4 pounds.

27A477 (I 1-67)

Copyright 1967, Shure Brothers, Inc.

2 2 2 H A R T R E Y A V E E V A N S T O N , I L L . ( 6 0 2 0 4 ) U . S . A .

A R E A C O D E 312/328 - 9000 ' C A B L E S H U R E M I C R O

MODELS M68, M68-2, AM) M68-2E MICROPHONE MIXERS lk I?*'?

General: The Shure Models M68, M68-2, and M68-2E are five channel, completely transistorized, portable microphone mixers for use with public address systems and tape recorders.

The Mixers Feature:

Four microphone inputs with individual slide switches mounted on rear panel for selection of low impedance (balanced or unbalanced) or high impedance (unbalanced).

One high level auxiliary input suitable for tape, tuner, and accessories. Individual volume control to balance each of the five inputs.

*A master volume control to simultaneously control level of all inputs.

*A high (unbalanced) or low impedance (balanced or unbalanced) microphone level output. Impedance selected with slide switch to match the microphone input of associated amplifier.

*A high impedance auxiliary output.

A DC power supply jack. This jack supplies 28 volts DC for use with accessories such as the Model A68P Phono Preamplifier or it may be used as power input in connection with the Model A68B Battery Power Supply (Accessory).

*A facility for connecting two or more mixers together to obtain additional microphone inputs. For example, two mixers connected together will give a total of eight microphone inputs and one auxiliary input.

0 U.S. Underwriters Laboratory approval for use in commercial applications. (Applies to Model M68 and M68-2).

INSTALLATION :

CONNECTION BETWEEN COMPONENTS

For balanced-line connection use two conductor, shielded, low capacity cable for connections. For unbalanced (high impedance), use single conductor, shielded, low capacity cable for connections.