Instruction Sheet
IS-MA60/125/250
Issued: 5-1-14
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: 17" wide x 3.5" high x 13.5"deep, 431.8mm wide x 88.9mm high x 342.9mm deep,
Frequency Response: 50Hz-20KHz + 3dB (Test signal inserted at aux input)
AC Supply Voltage: 115VAC or 230VAC (Rear panel switchable) + 10%, 50/60Hz
Channel 7
Telephone
Page
Channel 6
Music
Channel 5
Mic/Music
Channel 4
Mic/Music
Channel 3
Mic/Music
Channel 2
Mic/Music
Switch Defeatable Circuit Mutes CH3-CH6
Channel 1
Mic/Music
Bass
and
Treble
Controls
Master
Volume
Control
Mixing
And
Control
Section
Power
Amplifier
Circuit Mutes All Channels
MA60 60W RMS
MA125 125W RMS
MA250 250W RMS
8W
70V
25V
COM
4W
CH3
VC
CH4
VC
CH5
VC
CH6
VC
CH7
VC
CH2
VC
CH1
VC
Tape Out
Preamp Out
Power Amp In
Factory Installed
Jumper
DC Supply Voltage: 24VDC (Max 10% deviation)
Power Consumption: MA60 150W (if supply is AC) 5A (if supply is DC)
MA125 300W (if supply is AC) 8A (if supply is DC)
MA250 600W (if supply is AC) 16A (if supply is DC)
Shipping Weight: MA60: 22LBS. MA125: 24LBS. MA250: 29LBS.
Color: Black Note: Black rack mounting brackets are included.
Speaker Level Outputs: Screw terminal strip, 4W, 8W, 25V, 70V,
MA60: 60W RMS, MA125: 125W RMS, MA250: 250W RMS
Tape Outputs: Dual parallel RCA-phono jacks, 1V @ 4.7kW output
Preamp () Outputs: Dual parallel RCA-phono jacks, 1V @ 600W output
Convenience AC Outlet: 500W maximum unswitched outlet
Mic Inputs 1-5: XLR receptacle or screw terminals, 1mV @ 600W balanced,
Note: With channel aux switch depressed, XLR and screw terminal inputs still operate but are padded as line input
150mV @ 600W balanced.
Aux Inputs 1-6: Dual parallel RCA-phono jacks, Stereo converted to mono, 150mV @ 22kW
Telephone Input 7: Screw terminal strip, 150mV @ 600W balanced
Power Amp In: RCA-phono jack, 1V @ 8kW
Total Harmonic Distortion: Less than 1% at 1kHz at rated power.
Signal to Noise Ratio: 80dB (Test signal inserted at Aux 6 input), 60dB (Test signal inserted at Mic 1 input),
Tone Controls: Bass + 10dB @ 100Hz, Treble +10dB @ 10kHz,
Phantom Power: 16VDC, 1-5.
To defeat phantom power, . Channel-1: see jumper JP1,
Channel-2: see jumper JP2, Channel-3: see jumper JP3, Channel-4: see jumper JP4, Channel-5: see jumper JP5.
Priority Muting: 3 levels of priority. AMPLIFIER MUTING-PRIORITY SCHEME7.
Weight: MA60: 17LBS. MA125: 19LBS. MA250: 24LBS.
(8 pages)
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