Rolls Stereo Amplifier MA2152 User Guide

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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