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DESCRIPTION
FRONT PANEL
Mic 1, 2: Adjust the level of signal from the corresponding Mic Input.
TONE 1, 2: Adjusts the frequency content of the microphone signal in the chan-
nel. When the control is turned counter-clockwise, the high frequencies are cut,
when the control is turned clockwise, the low frequencies are cut.
Source 1 - 3: Adjust the volume of input from the RCA Source Inputs.
Bass: Adjusts the low frequencies of the Source 1 and 2 signals only.
Treble: Adjusts the high frequencies of the Source 1 and 2 signals only.
Left / Right Output: Adjusts that channel’s output level
Clip. LED indicating clipping in the MA2152 amplifier.
Power: LED indicating power is applied to the MA2152 and the unit is on.
REAR PANEL
FUSE: 4 Amp fuse.
4 - 8 Ohm / 25 Volt Output: The two red banana jacks are used when the
MA2152 is in Bridge/Mono, or 70V mode.
RECORD OUT: Stereo RCA jacks, contains all mixed signals before the Master
Level controls.
SOURCE INPUTS: Stereo RCA jacks, Channels 1 - 3, for connection to stereo
sources such as AM/FM tuners, cassette players, cd players, or video players.
LEFT/RIGHT AMP INSERT: 1/4” Tip-Send, Ring-Return insert jack.
DIP SWITCH: Contains the small switches for engaging Mic 1, 2 phantom power,
Source 3 Stereo or Mono, the priority (Talk Over) functions, and the Mono/Stereo
select.
MICROPHONE ONE and TWO: Balanced XLR inputs to be connected to dynam-
ic or condenser microphones.
BRIDGE SWITCH: This switch selects the output configuration; Bridge Mono, or
Stereo / Dual Mono.
SPECIFICATIONS
MIXER
Input Impedance: Mic: 600 Ohms XLR balanced
Source:
22K
Ohms
RCA
Insert: 22K Ohms 1/4” TS unbal.
Max Input Level: Mic: -14 dBV Mic level Max
Source: 24 dBV
Insert: 24 dBV
Connectors: 2: XLR, 8: Stereo RCA, 3: 1/4” TRS,
4: 5-way binding posts
Phantom Power: +12 VDC
Max Gain: Mic: 60 dBV
Source: 26 dBV
Tone Controls: +/-12 dB 100 Hz Bass
+/-12 dB 11kHz Treble
Noise Floor: Speaker out: -67 dBV
Pre Out: -90 dBV
S/N Ratio: 96 dBV
Priority Attenuation: 60 dBV
POWER AMP
Power Output, Stereo: 100 Watts RMS/Ch. 4 Ohms (Both channels driven)
70 Watts RMS/Ch. 8 Ohms
Bridged: 200 Watts RMS - 8 Ohms/70V
Output Matching: 4, 8, 16 Ohms, 25V Stereo, 70V Mono
THD: <.08%, (1 kHz @ 1 Watt)
Outputs: RCA Record Out, 5-Way binding post Power
Amp Outputs
Power Bandwidth: 60 Hz - 30 kHz, +/- 1 dB
Damping Factor: > 150
Slew Rate: 100 Volts/microSecond
Phase Shift: <10 Deg., 20 Hz - 20 kHz
Power: 120 VAC, 60 Hz 2.5A
Size: 19” x 3.5” x 7.5” (48 x 9 x 19 cm)
Weight: 12 lbs (5.5 kg)
SCHEMATIC
25
POWER AMP SECTION