Speco PMM-120A User manual

CAUTION: TO REDUCE THE RISK
OF ELECTRIC SHOCK, DO NOT
OPEN COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
WARNING: REMOVAL OF THE
COVER SHOULD ONLY BE PER-
FORMED BY QUALIFIED SERVICE
PERSONNEL - NOT USER SER-
VICEABLE. THE UNIT SHOULD
ALWAYS BE UNPLUGGED BEFORE
REMOVING THE COVER, AND
REMAIN UNPLUGGED WHILE THE
COVER IS REMOVED.
WARNING: TO PREVENT FIRE
OR SHOCK HAZARD, DO NOT
EXPOSE UNITS NOT
SPECIFICALLY DESIGNED FOR
OUTDOOR USE TO RAIN OR
MOISTURE.
INSTRUCTION
MANUAL
PUBLIC ADDRESS
AMPLIFIER
PMM-120A
PMM-60A
RISK OF ELECTRIC
SHOCK, DO NOT OPEN!
120 WATT RMS
60 WATT RMS
200 NEW HIGHWAY, AMITYVILLE, NY11701
PHONE : [phone] IN METRO NY
http://www.specotech.com
1.Unpacking
After removing the amplifier from the carton, inspect for any exterior damage to
the unit. If damage is noted, notify the carrier at once so that a claim can be
justified. Save all packing material. This is important when the claim is
processed.
PRECAUTIONS
2.Ventilation
To offset heat generated by the unit, it is necessary to provide ample ventilation
around the unit. Avoid blocking or impeding the ventilation holes on the unit. To
prevent unnecessary problems, install the unit in a place free from any
vibrations, direct sunlight, humidity or dust circulation.
3.Avoid spilling liquids or allowing materials to enter the cabinet
If the unit gets wet or any foreign material enters the cabinet, immediately
disconnect the A.C. line cord and consult your dealer or qualified technician.

2
IMPORTANT SAFETY INSTRUCTIONS
1.Read these instructions.
2.Keep these instructions.
3.Heed all warnings.
4.Follow all instructions.
5.Do not use this apparatus near water.
6.Clean only with dry cloth.
7.Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
8.Do not install near any heat sources such as radiators, heat registers, stoves, or
other apparatus (including amplifiers) that produceheat.
9.Do not defeat the purpose of the polarized or grounding-type plug. A polarized plug
has two blades with one wider that the other. A grounding type plug has two blades
and a third
grounding prong. The wide blade or the third prong are provided for your
safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10.Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where the exit from the apparatus.
11.Only use the attachments/accessories specified by the manufacturer.
12.Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,
or sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over.
13.Unplug this apparatus during lightning storms or when unused
for long periods of time.
14.Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way
such as power supply cord or plug is damaged, liquid has
been spilled or objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been dropped.
15. Apparatus shall not be exposed to dripping or splashing and no objects filled with
liquids, such as vases, shall be placed on the apparatus.
16. Warning –To reduce the risk of fire or electric shock, do not expose this apparatus
to rain or moisture.
17. Apparatus shall not be exposed to dripping or splashing and no objects filled with
liquids, such as vases, shall be placed on the apparatus.
18. Caution –Use of any controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure.

3
Controls and Connections
FRONT PANEL
1
2
3
4
5
6
7
8
9
10
11
REAR PANEL
1
4
5
6
7
8
9
13
15
17
18
19
20
28 30 3129
27
26
24
22
21
23
25
14
2
~
~
FRONT PANEL
1) MIC-1 Volume control 7) Bass Control
2) MIC-2 Volume control 8) Treble Control
3) MIC-3 Volume control 9) Master Volume control
4) MIC-4/AUX-1 Volume control 10) Power on/off switch with LED indicator
5) MIC-5/AUX-2 Volume control 11) Output level indicator
6) MIC-6/AUX-3 Volume control
REAR PANEL
1) AC power cord 17) EQ/MIX input RCA jack
2) Ground 18) Preamp output RCA jack
3) Speaker outputs 19) Tape output RCA jack
4) Manual muting terminals 20) Booster output RCA jack
5) MIC-6 input terminals (Balanced) 21) AUX-3 input RCA jacks
6) MIC-5 input terminals (Balanced) 22) MIC-6/AUX-3input selector switch
7) MIC-4 input terminals (Balanced) 23) AUX-2input RCA jacks
8) MIC-3 input terminals (Balanced) 24) MIC-5/AUX-2input selector switch
9) TEL/PAGING input terminals (Balanced)** 25) AUX-1 input RCA jacks
10) TEL/PAGING input level control 26) MIC-4/AUX-1 input selector switch
11) TEL/PAGING VOX sens. control 27) Loudness on/off switch
12) MIC-1 VOX on/off switch 28) MIC-4 (XLR connector) input
13) AC accessory outlet (Unswitched) 29) MIC-3 (XLR connector) input
14) AC fuse holder 30) MIC-2 (XLR connector) input
15) MOH output terminals 31) MIC-1 (XLR connector) input
16) MOH output level control*
*MOH = Music on hold
**TEL/PAGING= Connection input terminals for
general or emergency paging.
**TEL/PAGING is not to be connected directly to a
telephone circuit or TNV circuit.

4
FRONT PANEL
1) MIC-1 Volume control. Adjusts audio level of MIC-1.
2) MIC-2 Volume control. Adjusts audio level of MIC-2.
3) MIC-3 Volume control. Adjusts audio level of MIC-3.
4) MIC-4/AUX-1 Volume control. Adjusts audio level of MIC-4/AUX-1.
5) MIC-5/AUX-2 Volume control. Adjusts audio level of MIC-5/AUX-2.
6) MIC-6/AUX-3 Volume control. Adjusts audio level of MIC-6/AUX-3.
7) Bass Control. Low frequency tone control.
8) Treble Control. High frequency tone control.
9) Master Volume control. Controls all volume levels simultaneously.
10) Power on/off switch with LED indicator. Illuminates when power is on.
11) Output level indicator. Indicates power output. Do not overload amp.
REAR PANEL
1) AC power cord. AC power cord with three pin plug for a 120VAC 50/60 Hz, power source.
Do not defeat the ground pin.
2) Ground. Cabinet enclosure unit ground.
3) Speaker outputs. Speaker lines must be connected to “COM” and one (and only one) of
the remaining screw terminals.
4) Manual muting terminals. Provides contact closure muting of the AUX-1~3 and MIC-2~6
input during paging.
5) MIC-6 balanced input terminals. Accepts a balanced low impedance microphone signal.
6) MIC-5 balanced input terminals. Accepts a balanced low impedance microphone signal.
7) MIC-4 balanced input terminals. Accepts a balanced low impedance microphone signal.
8) MIC-3 balanced input terminals. Accepts a balanced low impedance microphone signal.
9) TEL / PAGING balanced input terminals. Accepts a balanced telephone paging signal.
10) TEL / PAGING input level control. Controls audio level of telephone input.
11) TEL / PAGING VOX sens. control. Controls the sensitivity of VOX muting of TEL input.
12) MIC-1 VOX on/off switch. MIC-1 inputs include VOX muting switch of the MIC-2~6 and
AUX-1~3 input during paging.
13) AC accessory outlet (Unswitched). Unswitched AC Auxiliary outlet for a 120VAC 50/60Hz
power source.
14) AC fuse holder.
15) MOH output terminals. Provided two MOH outputs 600 Ohm, 1 Volt and 8 Ohm, 1 Watt.
16) MOH output level control. Controls volume of MOH output. (Music on hold)
17) and 18) EQ / MIX input and preamp output RCA jacks. Connects the mixer / preamplifier
stage to the power amplifier stage .The connecting link must remain inserted for normal
operation as a mixer / amplifier. If a sound compressor / limiter, equalizer, or an external
signal processor is used in the sound system, connect the “PREAMP OUT” to the input of
the external processor and the output of the processor to “EQ / MIX IN. The “PREAMP OUT”
is after the tone controls and the master volume control.

5
Signal in Pre-Amplifier
PREAMP
OUT EQ/MIX
IN
Power output stage Speaker
STANDARD NORMAL OPERATION
Signal in Pre-Amplifier
PREAMP
OUT EQ/MIX
IN
Power output stage Speaker
OPERATION WITH MIXER ,EQUALIZER
SOUND COMPRESSOR / LIMITER ETC.
IN OUT
EQ/MIX
JUMPER
19) Tape output RCA jack. An audio output to supply signal to a tape recorder. This signal is
pre tone control and pre master volume control so that changing sound reinforcement level
requirements do not affect the recording level.
20) Booster output RCA jack. This output supplies the audio input signal to an additional
“booster” or power amplifier. This signal is after tone control and master volume control. In this
fashion, very large systems requiring more than 120 watts can be accommodated with an
additional booster amp.
21) AUX-3 input RCA jacks High impedance input available with parallel RCA jacks (for
combining stereo output accessories).
22) MIC-6/AUX-3 input selector switch. Allows for selection of either low impedance MIC-6
input or high impedance AUX-3input.
23) AUX-2 input RCA jacks High impedance input available with parallel RCA jacks (for
combining stereo output accessories).
24) MIC-5/AUX-2 input selector switch. Allows for selection of either low impedance MIC-5
input or high impedance AUX-2input.
25) AUX-1 input RCA jacks High impedance input available with parallel RCA jacks (for
combining stereo output accessories).
26) MIC-4/AUX-1 input selector switch. Allows for selection of either low impedance MIC-4
input or high impedance AUX-1 input.
27) Loudness on/off switch. Loudness adjustment for AUX-1~3, +8dB @100 Hz,+4dB @10
KHz.
28) MIC-4 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.

6
29) MIC-3 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
30) MIC-2 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
31) MIC-1 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
Note:MOH output features an internal selector jumper (factory set on AUX-1) AUX-1~3 when
background music is provided at the AUX inputs. MOH output function depends on the jumper
location or locations that are selected, see illustration on page 8.
Screw terminal designations: G-GND, HOT-Signal positive, COM-Signal negative/common.
Overcoming Ground Loop Problems
If the amplifier is mounted in a rack unit (Use rack mount part # PBM-RK2), or is used with
equipment having its own ground, it is necessary to ensure that ground loops and the associated
problems of hum on the output signal are not introduced by the ground wiring. (see warning)
Warning
To overcome this problem if it occurs, the electrical and the mechanical ground on the amplifier
may be separated by completely removing the wire connecting the power source to ground.
CONSULT AN ELECTRONICS TECHNICIAN TO ACCOMPLISH THIS TO AVOID POTENTIAL
PERSONAL INJURY OR A HAZARDOUS CONDITION.
SPEAKER CONNECTION
The rear panel of the amplifier contains a 7 screw terminal strip for connection of speakers.
BE CAREFUL TO CONNECT SPEAKERS PROPERLY, see impedance and line voltage instructions
below.
The speaker lines are to be connected directly between the appropriate COM terminal on the 7 screw
terminal strip and the terminal corresponding to the impedance of the speaker(s) or of the line voltage
selected. (70V or 25V)
4, 8 and 16 OHM CONNECTIONS (refer to figure 3).
Connect the cables to the terminals on the 7 screw terminal strip provided. Use the screw terminals
which correspond to the impedance of the speaker(s). One lead must always be connected to the
COM. This is just an example. If in doubt consult a qualified technician.
(+)
(+)
(+) (+)
TWO 8 SPEAKERS
(IN PARALLEL)
Ω
TWO 4 SPEAKERS
(IN SERIES)
Ω
FIGURE 3

7
25V and 70V CONSTANT LINE VOLTAGE CONNECTIONS
(refer to figure 4).
IMPORTANT NOTICE: When the 25V and 70V constant line voltages are used, a line
matching transformer must be used with each speaker. All
transformers must be connected in parallel.
HOW TO CONNECT LINE MATCHING TRANSFORMERS IN PARALLEL
(25 VOLT LINE OR 70 VOLT LINE)
ALWAYS CONNECT LINE TRANSFORMERS IN PARALLEL
NEVER CONNECT LINE TRANSFORMERS IN SERIES
SP1SPn SP1SPn
25V Transf.
70V Transf.
FIGURE 4
SPEAKER IMPEDANCES:
Speaker impedance taps for 4, 8 and 16 Ohm speakers are provided on a terminal strip on the rear
panel of the unit. Also, outputs for 25V and 70V constant line voltage are provided. To connect the
power output directly to a speaker or PA horn or a combinat
ion of speakers and/or PA horns which
have a resulting voice coil impedance of 4,8 or 16 Ohm, connect to the COM and the proper
impedance tap on the terminal strip. Be sure the speaker(s) or PA horn(s) is capable of handling a
reasonable power output from
the amplifier or permanent damage to the speaker(s) or PA horn(s) may
result. Also, be careful not to overload the amplifier with too many speakers or PA horns. If it is desired
to use a number and variety of speakers, the speakers must be arranged in vari
ous series or parallel
arrays to provide proper impedance matching or the 25V or 70V constant line voltage must be used
(parallel connection only). If you are not familiar with impedance matching, consult a professional
installer or technician for advice.
If the 25V or 70V constant line voltages are used, a line matching
transformer must be used with each speaker. Again do not overload or use incompatible speakers.
Line transformers are the preferred method for multi-speaker installation.

8
CABLE REQUIREMENTS
Output cabling need not be shielded in most cases and should be of sufficient gauge to minimize
losses due to the resistance of the wire over long runs (insertion loss). Cable thinner than 18
gauge is not recommended. Long runs require 16 gauge or heavier.
In some cases, where the output cable is run in close proximity to unshielded intercom cables,
electrical cables, radio transmission antennas or other sources of interference or when the
amplifier is being used for paging from a telephone system, the amplifier may require shielded
output cabling to prevent audio feedback or interference.
PRIORITY PAGE:THE AMPLIFIER FEATURES A VOICE ACTIVATED PRIORITY PAGE CIRCUIT
AND AUTOMATICALLY MUTES ALL PROGRAM MATERIAL (TUNER/TAPE/CD,ETC.) FROM THE
AMPLIFIERS OUTPUT AND PERMITS MICROPHONE # 1 AND THE TELEPHONE INPUT TO
OVERRIDE FOR PAGING ANNOUNCEMENTS.
TELEPHONE LINE: A TELEPHONE LINE INPUT OF 600 OHM IS PROVIDED.
THERE ARE MANY OTHER FEATURES OFFERED. PLEASE READ MANUAL COMPLETELY.
WHENEVER IN DOUBT ABOUT INSTALLATION, CONSULT WITH A PROFESSIONAL
INSTALLER OR TECHNICIAN OR PERSONAL INJURY, DAMAGE TO THIS AMPLIFIER
AND/OR SPEAKERS MAY RESULT AND YOUR WARRANTY MAY BE VOIDED.
MUSIC ON HOLD AND PHANTOM POWER JUMPER POSITIONING
These adjustments are to be made by qualified technical personnel –Be certain unit is
disconnected from A/C power source prior to removing unit’s cover or electrical shock or injury
may result. The unit provides a Phantom Power DC 15V for electret condenser microphone use.
Jumper location is to enable (ON) or disable (OFF) Phantom Power feature.
Note: Units come with Phantom Power enable (ON).
JP401
ONOFF
JP402
OFF
ON
3 2 1
S407
(AUX3) (AUX2) (AUX1)
M.O.H
PHANTOMPOWER PHANTOMPOWER
(MIC1) (MIC2)
Jumper location to select AUX input for music on hold output.(MOH on above
diagram)
Note: Units come with jumper set on AUX-1.

9
Step 1: Fill out Wattage Tap Requirement Chart (to right)
determining the number of speakers that will
be used at each wattage tap for the amplifier.
Step 2: Multiple the number of speakers by each wattage
tap to determine Total Wattage Requirement per
Tap setting (See Ex A).
Step 3: Add all the figures in shaded area to determine
the total Wattage Requirement for the amplifier.
Step 4: Match total Wattage Requirement to the bottom
chart "Recommended Amplifier Wattage Chart"
to determine acceptable RMS Wattage your
amplifier should have.
Step 5: Repeat this process for each amplifier system
required.
Ex A) 5 X _____________ = _____________
60 X _____________ = _____________
30 X _____________ = _____________
20 X _____________ = _____________
15 X _____________ = _____________
10 X _____________ = _____________
7.5 X _____________ = _____________
5X_____________ = _____________
4X_____________ = _____________
3.75 X _____________ = _____________
2.5 X _____________ = _____________
2X_____________ = _____________
1.50 X _____________ = _____________
1.25 X _____________ = _____________
1.00 X _____________ = _____________
0.50 X _____________ = _____________
0.25 X _____________ = _____________
0.125 X _____________ = _____________
Total Sum of Shaded Area
Represents Total Wattage
Requirement _____________
Determining Your Amplifier Needs
for Sound Systems Total Wattage
Requirement per
Tap Setting
Number of
Speakers at
Set Tap
Set
Wattage
Taps
Wattage Tap Requirement Chart
Acceptable Amplifier RMS Wattage
15 Watt 30 Watt 60 Watt 120 Watt
If Sum Wattage Total is 12 Watts or Less X X X X
If Sum Wattage Total is between 13 and 24 Watts X* X X X
If Sum Wattage Total is between 25 and 48 Watts X* X* X X
If Sum Wattage Total is between 49 and 96 Watts X* X* X* X
If Sum Wattage Total is between 97 and 204 Watts X* X* X* X*
If Sum Wattage Total is between 205 and 216 Watts X* X* X*
If Sum Wattage Total is between 217 and 240 Watts X* X*
If Sum Wattage Total is between 241 and 288 Watts X*
* RMS Amplifier used in conjuction with Speco Technologies’ P-240A Power Booster Amp
Recommended Amplifier Wattage Chart
For more information contact us at:
Speco Technologies 200 New Highway, Amityville, NY 11701 Web: www.specotech.com
Toll Free: 1-800-645-5516 In Metro NY:631-957-8700 Fax: [phone] or 631-957-3880
10 50

10
SPECIFICATIONS
Type Public Address Mixer Power Amplifier
Model No. PMM-60A PMM-120A
Power supply AC 120V, 50/60Hz AC 120V, 50/60Hz
Rated output power 60W RMS 120W RMS
Frequency response
50~15 KHz ±3dB 50~15 KHz ±3dB
Total harmonic
distortion 1% or less at 1 KHz at rated output 1% or less at 1KHz at rated output
Input
sensitivity and
impedance
TEL :100mV/600 Ohm, Balanced
MIC-1~6 : 1.0mV/600 Ohm, Balanced
AUX-
1~3 : 200mV/50K Ohm, Unbalanced
EQ/MIX IN : 1V/50K Ohm, Unbalanced
TEL :100mV/600 Ohm, Balanced
MIC-1~6 : 1.0mV/600 Ohm, Balanced
AUX-1~3 : 200mV/50K Ohm, Unbalanced
EQ/MIX IN : 1V/50K Ohm, Unbalanced
S/N Ratio MIC-1~6 Better than 60 dB
TEL Better than 60 dB
AUX-1~3 Better than 70 dB
MIC-1~6 Better than 60 dB
TEL Better than 60 dB
AUX-1~3 Better than 70 dB
Speaker outputs 4 Ohm, 8 Ohm, 16 Ohm
25V, 70V line outputs 4 Ohm, 8 Ohm, 16 Ohm 25V, 70V line outputs
Output sensitivity
and impedance
Tape out : 350mV/4.7K Ohm
Pre out : 1V/600 Ohm
Booster out : 1V/600 Ohm
Tape out : 350mV/4.7K Ohm
Pre out : 1V/600 Ohm
Booster out : 1V/600 Ohm
*MOH output 600 Ohm @ 1V and
8 Ohm -1Watt 600 Ohm @ 1V and 8 Ohm -1Watt
Mute level AUX-1~3/MIC-2~6 ≧40 dB AUX-1~3/MIC-2~6 ≧40 dB
**VOX level MIC-1/TEL 0~40 dB Adjustable** MIC-1/TEL 0~40 dB Adjustable**
Loudness control
AUX-1~3 +8dB @100Hz,+4dB @10KHz +8dB @100Hz,+4dB @10KHz
Phantom Power
MIC-1~6 15 V DC 15 V DC
Tone control Bass: ±10 dB at 100Hz Treble: ±10 dB at 10KHz Bass: ±10 dB at 100Hz
Treble: ±10 dB at 10KHz
Dimensions 430mm(W)x88mm(H)x300mm(D)
16.9”(W)x3.5”(H)x11.8”(D) 430mm(W)x88mm(H)x300mm(D) 16.9”(W)x3.5”(H)x11.8”(D)
Weight Approx 18.7 lbs (8.5 kgs) Approx 22 lbs (10.0 kgs)
Finish Black Black
Mounting
options
Table top or 19” rack mountable
(Use # PBM –RK2rack mount bracket)
Table top or 19” rack mountable
(Use # PBM –RK2rack mount bracket)
*MOH = Music on hold **Factory set : -40dB

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