PA8
TECHNICAL DATA
8-Channel Power Amplifier
Feature Highlights
• 8 separate amplifier channels
• 10 Watts per channel into 4 Ohms in non-bridged mode,
20 Watts per channel bridged into 8 Ohms
• Passively cooled
• Full short circuit and thermal overload protection
• No turn-on “thump”
The PA8 8 Channel Power Amplifier is a unigue 1 RU
solution for distributed loudspeaker systems using
mix-mminus zoning. The amplifier is typically used with
Lectrosonics matrix and DSP processors for sound
reinforcement systems in boardrooms, courtrooms and
conferencing systems.
Eight separate power amplifiers, each with an output
power capability of 10W (4 Ohms) or 6W (8 Ohms) provide amplification for each loudspeaker or zone-grouped
loudspeakers in the system. The PA8 is passively cooled,
and features full short-circuit and thermal overload protection. The amplifier outputs are also muted at turn-on
and turn-off, to eliminate transients.
The front panel includes a power switch and individual
level controls for each channel. The rear panel includes
a standard 3-pin AC power socket for IEC 60320 C13
cords. Line level audio inputs and speaker level outputs
are made via depluggable “Phoenix” connectors.
Two adjacent channels of a PA8 may be bridged to
increase the power output. In the bridged mode, the
minimum speaker load is 8 Ohms, and maximum power
output is 20W at 8 Ohms. The Channel Level controls
are set to the same level in this mode.
Rio Rancho, NM, USA
www.lectrosonics.com
PA8 Block Diagram
CH 1
3
4
CH 2
3
5
6
2
1
7
0
8
2
4
CH 3
3
5
6
1
0
7
8
4
CH 4
3
5
6
2
1
7
0
4
CH 5
3
5
6
2
1
8
7
0
LECTROSONICS
POWER AMPLIFIER
5
CH 8
SPEAKER OUT
7
4
CH 7
3
5
6
2
1
7
0
8
4
2
1
0
CH 8
3
5
6
7
8
4
5
6
2
1
7
0
8
OUTPUT LEVEL
MADE IN U.S.A.
E
6
6
8
POWER
LECTROSONICS, INC.
7
CH 6
3
5
1
0
OUTPUT LEVEL
8
4
2
R
8
CH 7
CH 6
LINE IN
CH 5
CAUTION
TO REDUCE THE RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE
3A, 250V "SLO-BLO" FUSE
WARNING
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE.
CH 4
CH 3
CH 2
CH 1
4
3
2
1
POWER
AMPLIFIER
120V AC
300 WATTS
LINE IN
SPEAKER OUT
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.
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 toroidal 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.
Signal-to-Noise Ratio:
System THD:
System IMD:
Slew Rate:
Power Consumption:
Euro Version*
Weight:
Dimensions:
Line Input
Type:
Impedance:
Rated Output:
Input Level for Rated Output:
Maximum System Gain
Line Input to Speaker Out:
Electronically balanced and RF filtered
20k Ohms, Balanced or Unbalanced
10 Watts RMS per channel at 4 Ohms
6 Watts RMS per channel at 8 Ohms
20 Watts RMS bridged at 8 Ohms
-2dBu (615mVRMS) at maximum level
+15dBu (4.36VRMS) at mid level
Any two adjacent channels may be used in the bridged
mode for higher power (20W into 8 Ohms or 12W into 16
Ohms).
88dB relative to 10W at 4 Ohms
Less than 0.1%, 20Hz to 20kHz
(10W into 4 Ohms)
Less than 0.1%, 60Hz/7kHz
(10W into 4 Ohms)
12V/uS
200 Watts max at 120VAC
200 Watts max at 230VAC
8 lbs, 9 ozs
19” wide x 1 3/4” high x 8 1/4” deep
20dB
PA8TD-0603
*Euro version, I-PA8 runs on 220VAC.
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • [email protected]
22 September, 2009