Infinity 7540a User Manual

- CONTENTS -
SPECIFICATIONS ………………………………….……..1
FEATURES/TEST CONDITIONS……..…………………2
CONTROLS/CONNECTIONS………….……..…...…..…3
INSTALLATION………………….……...……..…...…...…5
BASIC TROUBLESHOOTING..…….…….………………6
TYPICAL SYSTEM WIRING..…….…….……………..…7
EXPLODED VIEW/PARTS LIST…….….….…………....8
MECHANICAL PARTS LIST……………..…………........9
AMPLIFIER BLOCK DIAGRAM…………………………10
P.C.B. DRAWINGS….…………………………………….11
ELECTRICAL PARTS LIST ……………………………. 15
REF 7541a ELECTRICAL PARTS LIST ADDENDUM….……18
IC/TRANSISTOR PINOUTS..………………………. …..19
REF 7540a SCHEMATICS……………………………....22
REF 7541a SCHEMATICS…………………………..…..25
PACKING……..……………………………………..…....28
Reference 7540a/7541a Specifications
Output Power: 111W RMS x 4 channels @ 4 ohms; ≤1% THD + N
(14.4V supply) 139W RMS x 4 channels @ 2 ohms; ≤1% THD + N
278W RMS x 2 channels @ 4 ohms; ≤1% THD + N
Signal-to-noise ratio: 81dBA (reference 1W into 4 ohms)
Dynamic power: 164W @ 2 ohms
Effective damping factor: 6.315 @ 4 ohms
Frequency response: 10Hz – 100kHz (–3dB)
Maximum input signal: 5.5V
Maximum sensitivity: Reference 7540a - 230mV
Reference 7541a - 75mV
DC Offset <50mV (-50%)
Output regulation: .088dB @ 4 ohms
Idle Current 1.2A
Input Impedance 22kΩ
Max Current Draw 54A @ 4 ohms
83A @ 2 ohms
Dimensions: 12 x 15 x 2 11/16” (L x W x D)
(305mm x 381mm x 68mm)
Fuses: 30A x 2
Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in
this and related JBL publications are therefore subject to change without notice.
1
Power Amplifier Reference 7540a/7541a

Infinity 7540a Specifications

General

Brand	Infinity
Model	7540a
Category	Amplifier
Language	English