JBL SE-408S Transducer Energizer - takes the
place of a conventional stereo power amplifier, mounts directly into the rear
panel of JBL loudspeaker enclosures. Plug-in equalizer boards tailor the
characteristics of the SE-408S to precisely match the requirements of the
loudspeaker systems which it drives. Performance of such a self-Energized
combination is audibly superior to that which can be realized from any
all-purpose amplifier
Special
Features:
Plug-in
equalizer boards match the performance of each channel of the Energizer to the
requirements of the particular loudspeaker system used; exact damping for best
transient reproduction, final frequency response correction for smoothest
response. With the boards inserted for unequalized operation, the Energized
operates as a laboratory standard power amplifier of the highest quality.
Circuit:
The JBl
T-Circuit is an analog computer-type operational DC amplifier, the most nearly
perfect amplifying circuit ever developed. All stages are direct-coupled,
including the output stage, so that accurate control of the loudspeaker is
maintained all the way down to zero frequency.
Specifications:
(All
specifications are measured with both channels operating simultaneously into 8 Ω loads. AC line voltage is held to 117 volts, 60
cycles. In normal operation, the performance of the SE-408S is not appreciably affected by line voltage
fluctuations between 110 and 127 volts.)
Power
Output:
80 watts
continuous RMS power;
40 watts per
channel, at any frequency from 10 cps to 30,000 cps
Frequency
Response: with equalizer boards inserted
for unequalized operation):
±0,25 dB
form 20 cps to 20,000 cps
±1,5 dB from
3 cps to 175,000 cps
Harmonic
Distortion: less than o,15% from 20 cps
to 20,000 cps at 80 watts or any level less than 80 watts
Intermodulation
Distortion: less than 0,15% at 80 watts
or any level less than 80 watts (IHF standard 60 - 7,000 cps, 4 : 1 ratio)
Sensitivity: 0,8 to 3,0 volts input for rated output,
depending upon the particular equalizer boards installed.
Hum and
Noise: 90 dB below rated output
Transient
Response: with equalizer boards set for
unequalized operation, rise time is 2,0 microseconds from 10% to 90 % of square
wave signal at 160 watts peak power or any lower power level. Response to such
square wave signals is free from detectable overshoot or ringing, as observed
on an oscilloscope.
Overload
Recovery: less than 1/10th of one cycle
to recover from 100% single cycle overload at any frequency from 20 to 20,000
cps
Output
Impedance: 8 Ω rated impedance
(when
driving a 16 Ω load, the SA-600 meets
all published specifications except that power output is reduced to 64 watts.
Wen driving a 4 Ω load the SA-600
produces 130 watts of undistorted power for brief periodes of time. Prolonged operation at more than 40 watts per
channel however will trigger the built-in automatic overload devices.
Stability: the SE-408S, like the SA-600,
utilize the exclusive JBL T-Circuit. The circuit is completely stable when
connected to any loudspeaker system or even to a capactive load. Specifeid
distortion and stability without ascilation are maintained through extreme
variations in output load, whether resistiv, capacitive or inductive. Moreover,
AC line surges do not affect the stability of the circuit.
Short
Circuit Protection: Absolute, The SA-600
cannot be damaged by accidental or intentional short or open circuit at the
output terminals, or by any degree of impedance mismatch.
Transistors: 22 silicon
transistors plus 20 silicon diodes.
Dimensions
(W x H x D): SE-408S
: 15-1/4" x 4-5/8" x
6-3/4"
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