AL1 Module (
Figures 9 & 10
)
The AL1 — Automatic Line-Level Switcher — module has a default input as
well as a sensing input. When signal is detected at the sensing input, that
signal is fed to the amplifier as well as its output jacks. At the same time a 12V
DC control signal is present on the removable screw connector.
The sensing input has a sensitivity control as well as a delay adjustment which
controls the time the module waits after the signal at the sensing jack subsides
before switching back to the default input.
Figure 10 shows a 275 SE amplifier with the AL1 module in a restaurant
installation. The module’s default input is connected to the house restaurant
audio and the sensing input monitors the paging microphone. The output is
feeding a second 275 SE that has the factory-installed BBE module.
SPECIFICATIONS
Rated Power (20Hz – 20kHz) RMS: 75 Watts per channel @ 8 ohms
125 Watts per channel @ 4 ohms
135 Watts per channel @ 2.7 ohms
Bridged Power (20Hz – 20kHz) RMS: 250 Watts @ 8 ohms (275 SE only)
Midband Power (1kHz, at Clipping) RMS: 114 Watts per channel @ 8 ohms
140 Watts per channel @ 4 ohms
168 Watts per channel @ 2.7 ohms
Bridged Midband Power (1kHz) RMS: 270 Watts @ 8 ohms (275 SE only)
IHF Dynamic Power 120 Watts per channel @ 8 ohms
(20ms 1kHz Tone Burst) 194 Watts per channel @ 4 ohms
per IHF RS-490/3.2: 239 Watts per channel @ 2.7 ohms
IHF Dynamic Headroom +1.75 dB @ 8 ohms
+1.9 dB @ 4 ohms
+2.5 dB @ 2.7 ohms
Total Harmonic Distortion (2-channel mode): 0.05% 20Hz – 20kHz @ 8 ohms
0.08% 20Hz – 20kHz @ 4 ohms
0.15% 20Hz – 20kHz @ 2.7 ohms
Total Harmonic Distortion (Bridged mode): 0.05% 20Hz – 20kHz @ 8 ohms
I.M. Distortion (SMPTE 4:1) @ 8 ohms: 0.008% @ 1 watt
0.015% @ 75 watts
Signal to Noise Ratio: 105dB below rated output
(A-weighted)
Input Sensitivity: 0.7 volts for rated output
(75 watts @8 ohms)
Input Impedance: 47k ohms, Min.
Power Requirement (120V version): 120 VAC, 50/60Hz
Power Requirement (230V version): 230 VAC, 50/60Hz
Power Consumption (all versions): 500 watts (625VA)
Heat Output
(BTU/HR @ 8 ohms): 164 (classical); 232 (rock)
(BTU/HR @ 4 ohms): 294 (classical); 418 (rock)
(BTU/HR @ 2.7 ohms): 382 (classical); 542 (rock)
Dimensions (W x H x D): 16¾" x 3
7
/8
" x 15¼"
(425mm x 98mm x 387mm)
Dimensions w/Rack Ears (W x H x D): 19" x 3½" x 15¼"
(483mm x 89mm x 387mm)
Rack Space Requirement: 2U
Shipping Weight: 24 lbs (10.9 kg)
9
Figure 9: AL1 SAT Module
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