Instruction Sheet
IS-MA30
Issued: 2-18-19
Lowell Manufacturing Company
100 Integram Drive
Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660
Fax: 636-257-6606
Click: www.lowellmfg.com
3
Amplifier Block Diagram
Technical Specifications
Dimensions:
8.35" wide x 3.46" high x 10.83"deep (212mm wide x 88mm high x 275mm deep)
Frequency Response: 50Hz-20KHz + 3dB (
Test signal inserted at aux input
)
AC Supply Voltage: 120VAC 60Hz + 10%. External circuit breaker: 1.5A
Switch Defeatable Circuit Mutes AUX1, AUX3, and PROGRAM Inputs
Mixing
And
Control
Section
Power Consumption: 90W@Rated Power. Internal fuses: 2) 5X20mm 3A
Shipping Weight: MA30: 10.0LBS. (4.54KGS)
Color: Black
Speaker Level Outputs: Screw terminal strips,
Main Output: 4
W
, 8
W
, 25V, 70V, 30W RMS
Music-On-Hold: (MOH), 1W @ 8
W
Convenience AC Outlet: 500W maximum unswitched outlet. External circuit breaker: 4A (convenience outlet only)
Mic Input: Screw terminals, 1mV @ 600
W
balanced (Phantom power is not available.)
Aux Inputs 1-3: Dual parallel unbalanced RCA-phono jacks, Stereo converted to mono, 150mV @ 10k
W
Total Harmonic Distortion: Less than 1% at 1kHz at rated power.
Signal to Noise Ratio: 80dB (
Test signal inserted at Aux input)
Tone Controls: Bass + 10dB @ 100Hz, 10dB @ 10kHz,
Weight:
MA30: 8.82LBS. (4KGS)
Bass and
Treble
Controls
Power
Amplifier
30W RMS
AUX 1
Input
AUX 1
Volume
Control
PROGRAM
Volume
Control
G
COM HOT
PROG RAM
Input
AUX 3
Input
MIC /TEL
Volume
Control
G
COM HOT
MIC / TEL
Input
AUX 2
Input
G
COM
8
W
8
W
70V
25V
COM
4
W
SPEAKER
LEVEL
OUTPUTS
MUSIC-ON-HOLD
(MOH)
OUTPUT
MOH
Level
Control
Telephone Input: Screw terminals (switchable, same terminals as mic input)
100mV @ 10k
W
balanced
Program Input: Screw terminals 100mV @ 10k
W
balanced
Accessories: 30WK (wall mounting kit), 30RK (rack kit), and 30HRK (half-rack kit) are sold separately.
Note: The MOH output is only
fed by the AUX 1, AUX 2, and
AUX 3 input signals. The MIC/
TEL and PROG RAM inputs are
NOT fed t o the MO H output. No
front panel controls aff ect the
MOH output.
Amplifier Muting-Priority Scheme
The amplifier includes unique voice-activated (VOX) ducking/muting circuitry. The mute circuit is only active when
the
“
MUTE
”
switch on the rear panel has been turned
“
ON
”
. When a page is made into the microphone or
telephone input (Channel MIC/TEL), the PROGRAM, Aux 1, and Aux 3 music inputs will duck in volume (not be
completely muted). If the incoming page is strong enough in level, the music volume will be completely muted.
When the page has been completed, the volume of the music will return to its normal level. Note that AUX 2 is not
involved in the muting circuit, because when the Mic/Tel
–
Aux 2 switch is in the Aux 2 position, the Aux 2 input is
active but the MIC/TEL input is defeated so muting by the MIC/TEL input is not an issue.
