Speco PBM-15 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
RISK OF ELECTRIC
SHOCK, DO NOT OPEN!
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 on 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.
PBM-15 15 WATT RMS
PBM-30 30 WATT RMS
PUBLIC ADDRESS
AMPLIFIER
200 NEW HIGHWAY, AMITYVILLE, NY11701
PHONE : [phone] IN METRO NY
http://www.specotech.com

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
REAR PANEL
14 12
1 2
11 10 9 8 7
3 4 6 5
13
~
~
~
FRONT PANEL
1) MIC-1 Volume control 4) TREBLE Control
2) MIC-2/AUX Volume control 5) POWER on/off switch with indicator
3) BASS Control
REAR PANEL
1) AC accessory outlet (Unswitched) 8) MIC-1 input terminals(Balanced)
2) AC fuse holder 9) MIC-2 input terminals(Balanced)
3) MOH output level control* 10) Manual muting terminals
4) MIC-2/AUX input selector switch 11) MOH output terminals*
5) AUX input RCA jacks 12) Speaker outputs
6) TEL/PAGING output level control** 13) Ground
7) TEL/PAGING input terminals(Balanced)** 14) AC power cord
*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.
*MOH = Music on hold
**TEL/PAGING= Connection input terminals for
general or emergency paging.

4
FRONT PANEL
1) MIC-1 Volume control. Adjusts audio level of MIC-1.
2) MIC-2/AUX Volume control. Adjusts audio level of MIC-2/AUX.
3) Bass Control. Low frequency tone control.
4) Treble Control. High frequency tone control.
5) Power on/off switch with indicator. Illuminates when power is on.
REAR PANEL
1) AC accessory outlet (Unswitched). Unswitched AC Auxiliary outlet for a 120VAC. 50/60Hz
power source.
2) AC fuse holder.
3) MOH output level control. Controls volume of MOH output. (Music on hold)
4) MIC-2/AUX input selector switch. Allows for selection of either low impedance MIC-2 input or
high impedance AUX input.
5) AUX input RCA jacks. Provides connection for a booster amplifier. The input impedance of the
equipment should be more than 600 Ohm.
6) TEL/PAGING output level control. Controls audio level of telephone output.
7) TEL/PAGING balanced input terminals. Accepts a balanced telephone paging signal.
8) MIC-1 balanced input terminals. Accepts a balanced low impedance microphone signal.
9) MIC-2 balanced input terminals. Accepts a balanced low impedance microphone signal.
10) Manual muting terminals. Provides contact closure muting of the MIC-2/AUX input during
paging.
11) MOH output terminals. Provides two MOH outputs 600 Ohm, 1 Volt and 8 Ohm, 1 Watt.
12) Speaker outputs. Speaker lines must be connected to “COM” and one (and only one) of
the remaining screw terminals.
13) Ground. Cabinet enclosure unit ground.
14) AC power cord. AC power cord with three pin plug for a 120VAC 50/60 Hz, power source.
Do not defeat the ground pin.
Note: MIC-1/TEL input include internally adjustable (factory set) VOX muting of the MIC-2 and AUX
input during paging.
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-RK1), 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)

5
Warning
To overcome this potential problem, 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 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.
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

6
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
S
P
1S
P
n
S
P
1S
P
n
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 combination 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 various series or
parallel arrays to provide proper impedance matching or the 25V or 70V constant line voltage must be
used. 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 transformermust be used
with each speaker. Again do not overload or use incompatible speakers. Line transformer are the
preferred method for multi-speaker installation.

7
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 antenna 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.

8
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

9
SPECIFICATIONS
Type Public Address Mixer Power Amplifier
Model No. PBM-15 PBM-30
Power supply AC 120V, 50/60Hz AC 120V, 50/60Hz
Rated output
power 15W RMS 30W 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-1:1.0mV/600 Ohm, Balanced
MIC-2:1.0mV/600 Ohm, Balanced
AUX:200mV/50K Ohm, Unbalanced
TEL :100mV/600 Ohm, Balanced
MIC-1:1.0mV/600 Ohm, Balanced
MIC-2:1.0mV/600 Ohm, Balanced
AUX:200mV/50K Ohm, Unbalanced
S/N Ratio MIC-1 Better than 55 dB
MIC-2 Better than 55 dB
TEL Better than 60 dB
AUX Better than 70 dB
MIC-1 Better than 55 dB
MIC-2 Better than 55 dB
TEL Better than 60 dB
AUX 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
*MOH output 600 Ohm @ 1V and
8 Ohm -1Watt 600 Ohm @ 1V and 8 Ohm -1Watt
Mute level MIC-2/ AUX≧40 dB MIC-2/ AUX≧40 dB
**VOX level MIC-1/TEL 0~40 dB Adjustable** MIC-1/TEL 0~40 dB Adjustable**
Tone control Bass: ±10 dB at 100Hz
Treble: ±10 dB at 10KHz Bass: ±10 dB at 100Hz Treble: ±10 dB at 10KHz
Dimensions 272mm(W)x88mm(H)x240mm(D)
10.7”(W)x3.5”(H)x9.4”(D) 272mm(W)x88mm(H)x240mm(D) 10.7”(W)x3.5”(H)x9.4”(D)
Weight Approx 8 lbs(3.7 kgs) Approx 22 lbs (10.0 kgs)
Finish Black Black
Mounting
options
Table top or 19” rack or wall
mountable (Use # PBM-RK1 rack
mount bracket)
Table top or 19” rack or wall
mountable (Use # PBM-RK1 rack
mount bracket)
*MOH = Music on hold **Factory set : -40 dB

10