LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be free
from defects in materials and workmanship under normal installation, use and
service for a period of one (1) year from the date of purchase as shown on the
purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be limited
to repair or replacement (at our option), during the warranty period of any part
which proves defective in material or workmanship under normal installation,
use and service, provided the product is returned to Rolls Corporation, TRANS-
PORTATION CHARGES PREPAID. Products returned to us or to an authorized
Service Center must be accompanied by a copy of the purchase receipt. In the
absence of such purchase receipt, the warranty period shall be one (1) year from
the date of manufacture.
MA2152
Mixer / Amplifier
This warranty shall be invalid if the product is damaged as a result of
defacement, misuse, abuse, neglect, accident, destruction or alteration of the se-
rial number, improper electrical voltages or currents, repair, alteration or mainte-
nance by any person or party other than our own service facility or an authorized
Service Center, or any use violative of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties, obligations
or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILI-
TIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
SHALL BE LIMITED IN DURATION TO THE ONE YEAR DURATION OF
THIS WRITTEN LIMITED WARRANTY. Some states do not allow limitations
on how long an implied warranty lasts, so the above limitation may not apply to
you.
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL, INCI-
DENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR
ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER.
Some states do not allow the exclusion or limitation of special, incidental or con-
sequential damages so the above limitation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights
which vary from state to state.
ROLLS CORPORATION
SALT LAKE CITY, UTAH
1/04
OWNERS MANUAL
SPECIFICATIONS
DESCRIPTION
MIXER
FRONT PANEL
Input Impedance:
Mic:
Mic:
600 Ohms XLR balanced
Source: 22K Ohms RCA
Insert: 22K Ohms 1/4” TS unbal.
-14 dBV Mic level Max
Source: 24 dBV
Max Input Level:
Connectors:
Insert: 24 dBV
2: XLR, 8: Stereo RCA, 3: 1/4” TRS,
4: 5-way binding posts
+12 VDC
Phantom Power:
Max Gain:
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
Mic:
60 dBV
Source: 26 dBV
+/-12 dB 100 Hz Bass
+/-12 dB 11kHz Treble
Speaker out: -67 dBV
Pre Out: -90 dBV
96 dBV
Tone Controls:
Noise Floor:
S/N Ratio:
Priority Attenuation:
POWER AMP
60 dBV
Power Output,
Stereo:
100 Watts RMS/Ch. 4 Ohms (Both channels driven)
70 Watts RMS/Ch. 8 Ohms
200 Watts RMS - 8 Ohms/70V
4, 8, 16 Ohms, 25V Stereo, 70V Mono
<.08%, (1 kHz @ 1 Watt)
RCA Record Out, 5-Way binding post Power
Amp Outputs
Clip. LED indicating clipping in the MA2152 amplifier.
Power: LED indicating power is applied to the MA2152 and the unit is on.
Bridged:
Output Matching:
THD:
Outputs:
REAR PANEL
Power Bandwidth:
Damping Factor:
Slew Rate:
Phase Shift:
Power:
Size:
Weight:
60 Hz - 30 kHz, +/- 1 dB
> 150
100 Volts/microSecond
<10 Deg., 20 Hz - 20 kHz
120 VAC, 60 Hz 2.5A
19” x 3.5” x 7.5” (48 x 9 x 19 cm)
12 lbs (5.5 kg)
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.
SCHEMATIC
POWER AMP SECTION
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.
5
2
CONNECTION
OPERATION
Inputs
DIP SWITCH SETTINGS (From left to right)
Connect low impedance microphones to the Mic inputs. If a paging microphone
is being used, connect it to Mic Input 1 so it may be used with the Talk Over
function. Connect source signals such as CD players, cassette players or video
players to the RCA Source Inputs. If a jukebox is being connected, and you want
its signal to mute the other source signals, connect it to Source input 1.
• If a microphone requires phantom power, move the Mic channel’s correspond-
ing PHANTOM POWER switch to the up position. This applies 12 volts dc phan-
tom power to the indicated microphone.
• SOURCE 1 MONO; this switch sums the Right and Left inputs of Source 1 to
mixed dual-mono inputs.
For recording purposes, connect a stereo RCA cable to the Record Out jacks,
and to your recording device.
• Mic 1 Priority; when in the up position, all program material on Mic 2 and Sourc-
es 2 and 3 will be “ducked” or muted when a signal is present at Mic 1. Source 3
is left un-muted.
Amp Inserts
To connect a signal processor to the MA2152 signal(s), use an insert plug, or
cable wired as shown in Fig. 1. This return signal is then sent to the output level
section of the amplifier.
This function is used for paging.
• Source 3 Priority: when in the up position, Source 1,and 2 will be “ducked” or
muted by the signals at Source 1.
Outputs
This function is for jukebox priority. With a jukebox connected to Source input 1,
and the Talkover switch 2 on, the other Source input signals such as background
music, will be muted and only the jukebox will be heard.
In STEREO MODE, the Right speaker is connected to the red and black banana
RIGHT OUTPU connectors. The Left speaker is connected to the red and black
banana LEFT OUTPUT connectors. Impedances should be no less then 4 Ohms.
In BRIDGE MONO MODE, the speakers are connected to the two red BRIDGE
OUTPUT connectors.
• MONO / STEREO: When down, the output of the MA2152 is summed to mono.
Either jack can be used as a mono output.
Connect the MA2152 to a properly grounded AC outlet. There is a one second
turn-on delay provided to prevent possible speaker damage in case all equip-
ment is on a single power strip.
FAULT PROTECTION
The fault protection in the MA2152 limits the current to the output stage. This
mode is entered whenever the output stage is called upon for too much power, it
may also be fooled by impedances lower than four ohms - which may cause the
output stage to overheat and be irreversably damaged.
BRIDGING
To bridge the MA2152 outputs together, first ensure the power is off. Move the
BRIDGE switch to the “Bridge” position, and set the STEREO/MONO DIP Switch
(details on the next page), to MONO. The Channel 1 Volume control will be the
master volume - Channel 2 is inactive. Connect the load (speakers) to the two
positive (red) banana jacks. Make no connections to the black posts. The level
meters will both light, and the output power into 8 Ohms is the sum of the LEDs
that light.
Since the MA2152 is convection cooled, the unit radiates heat from the front
panel and, depending on the load demand, it may become very hot if drawn upon
heavily.
DRIVING 25 OR 70 VOLT LINES
The MA2152 will drive 25 or 70 Volt lines directly with no added transformers
when used the following way:
- Each channel (used individually) will drive 25 Volt lines directly.
- A single 70 Volt line bay be driven when the MA2152 is in Bridged Mode. In
order to drive two 70 Volt lines, two 8 Ohms to 70 Volt conversion transformers
will be needed.
To Amp Insert
Fig. 1
3
4
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