Pa8 block diagram – Lectrosonics PA8 - 8-Channel Power Amplifier User Manual
Page 2
22 September, 2009
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • [email protected]
The input to the PA8 is fully balanced and RF filtered. The
level control feeds a monolythic power amplifier. Each
power amplifier is internally power limited to protect itself
from short circuits, excessively low load impedances, or
highly reactive loads. Thermal limiting is also integrated
into the power amplifier, with an intelligent shutdown
mode that minimizes thermal shock to the device under
extreme operation.
Signal-to-Noise Ratio:
88dB relative to 10W at 4 Ohms
System THD:
Less than 0.1%, 20Hz to 20kHz
(10W into 4 Ohms)
System IMD:
Less than 0.1%, 60Hz/7kHz
(10W into 4 Ohms)
Slew Rate:
12V/uS
Power Consumption:
200 Watts max at 120VAC
Euro Version*
200 Watts max at 230VAC
Weight:
8 lbs, 9 ozs
Dimensions:
19” wide x 1 3/4” high x 8 1/4” deep
PA8TD-0603
Line Input
Type:
Electronically balanced and RF filtered
Impedance:
20k Ohms, Balanced or Unbalanced
Rated Output:
10 Watts RMS per channel at 4 Ohms
6 Watts RMS per channel at 8 Ohms
20 Watts RMS bridged at 8 Ohms
Input Level for Rated Output:
-2dBu (615mVRMS) at maximum level
+15dBu (4.36VRMS) at mid level
Maximum System Gain
Line Input to Speaker Out:
20dB
*Euro version, I-PA8 runs on 220VAC.
CAUTION
WARNING
LINE IN
1
2
3
4
LECTROSONICS, INC.
5
6
7
8
SPEAKER OUT
LINE IN
MADE IN U.S.A.
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE.
TO REDUCE THE RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE
3A, 250V "SLO-BLO" FUSE
120V AC
300 WATTS
SPEAKER OUT
POWER
AMPLIFIER
CH 5
CH 6
CH 7
CH 8
CH 1
CH 2
CH 3
CH 4
E
PA8 Block Diagram
The PA8 uses a straightforward, low parts count design
for long term reliability. The heart of the power supply of
the PA8 is a low radiation toroidal transformer. The toroi-
dal transformer generates less heat than a conventional
type and emits considerably less 60 cycle energy. This
is particularly important when the PA8 is used in close
proximity to microphone preamplifiers.
Any two adjacent channels may be used in the bridged
mode for higher power (20W into 8 Ohms or 12W into 16
Ohms).
POWER AMPLIFIER
POWER
OUTPUT LEVEL
OUTPUT LEVEL
CH 8
CH 7
CH 6
CH 5
CH 4
CH 3
CH 2
CH 1
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
1
2
3 4
5
6
7
8
0
LECTROSONICS
R