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Page 43

CE-Series

Amps with an Attitude!

Page 42

CE-Series

Amps with an Attitude!

Reference Manual

The turn on delay circuit functions to keep the output relay

open until all the voltages are up and stable, both in the ampli-

fier, and in all the components in the system ahead of the am-

plifier.

Heatsink temperature is monitored by a thermal probe at-

tached to the heatsink. As the temperature rises, the probe

sends a proportional current to the proportional speed fan cir-

cuit which starts the fan. Should the power transformer reach

its maximum safe temperature, an internal thermal switch

opens and the fan circuit turns on full speed to quickly cool

down the amplifier. It also disconnects the load via the output

relay, removing any output current and further speeding a cool-

down cycle. Extra care was taken during the design stage to

set this point both to protect your investment and to guard

against nuisance tripping.

Whenever the heatsinks or the transformer reach a maximum

temperature, or during the normal turn on delay window, the

front panel Fault LEDs will blink to get your attention.

TRANSLATOR LVA

BIAS

CURRENT

SOURCE

BALANCE

INPUT STAGE

VARIABLE

GAIN STAGE

ERROR

AMP

BALANCED

INPUTS

TO SIGNAL

PRESENCE

INDICATOR

COMPRESSOR

CONTROL

TO CLIP

INDICATOR

BUFFER

MUTE

DC PROTECT

LOGIC

FAULT

CONNECTOR

–VCC

+ HI-VOLTAGE

BOOTSTRAP

BIASBIASBIASBIASBIAS

TDVI

LIMITER

TRIPLE-DEEP

DARLINGTON

NPN POSITIVE

OUTPUT STAGE

TRIPLE-DEEP

DARLINGTON

NPN NEGATIVE

OUTPUT STAGE

PROPORTIONAL

SPEED

FAN

CONTROL

FAN

PROTECT

HEATSINK

TEMPERATURE

OUTPUT

CONTROL

HEATSINK

TEMPERATURE

TRANSFORMER

TEMPERATURE

TO FAULT

INDICATOR

POWER

SUPPLY

+ VCC

+ 15V

– 15V

– VCC

TURN-ON

DELAY

OUTPUT

BOOTSTRAP

CIRCUIT

+ HI-VOLTAGE

BOOTSTRAP

The output transistors are protected by the Time Dependent

Voltage & Current circuit. This circuit protects the devices from

extending beyond their safe area of operation, but allows the

devices to provide high bursts of peak power with music, al-

lowing your amplifier to deliver more punch. When all is said

and done, this amplifier output topology offers a good combi-

nation of low quiescent amplifier heating, great distortion per-

formance at high powers, and relative simplicity, with

impressive reliability and value.

All output power is delivered through 4-circuit Speakon

con-

nectors. These connectors have been wired in such a way as

to allow you the most versatility. The Channel 1 and 2 connec-

tors are cross wired so you can cover all options, from dual

cable stereo (typical), to Bridge-Mono in one connector, to run-

ning a bi-amp speaker with one amplifier and one cable per

speaker cabinet!

The output relay, in conjunction with input signal mute circuit,

assures the amplifier will be well-behaved during turn on and

off. In the event of an amplifier output failure, a triac will acti-

vate to turn off the offending channel and protect your speak-

ers.

Fig. 6.1

CE-Series

Amplifier Block

Diagram

(Shown with

Standard Input

Module)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28

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Crown SST-SBSC Spécifications Page 22

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