Speco PL-260A 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
MIXER POWER AMPLIFIER
PL-260A
RISK OF ELECTRIC
SHOCK, DO NOT OPEN!
260 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 Instructions-All the safety and operating instructions should be read before
the unit is operated.
2. Retain Instructions-The safety and operating instructions should be retained for
future reference.
3. Heed Warnings-All warnings on the unit and in the operating instructions should
be adhered to.
4. Follow Instructions -All operating instructions should be followed.
5. Do not use this unit near water-for example, near a bath tub, wash basin, kitchen
sink, in alaundry room, in a wet basement, near a swimming pool, in an
unprotected outdoor installation, or any area which is classified as a wet location.
6. Unplug unit from AC outlet, use a damp cloth for cleaning. Do not use liquid
cleaners or aerosol cleaners.
7. Do not block any of the ventilation openings. Install in accordance with the
instructions provided.
8. Do not install near any heat sources such as radiators, stoves, or other apparatus
(including amplifiers) that produce heat.
9. Do not mount amplifier in an enclosure or a closed,unventilated closet while
operating.
10. Do not place any object or accessory equipment such as Tuners, Mixers,
Cassette Decks, etc. on top of the amplifier. Obstructing or closing the cabinet
ventilation openings may cause overheating.
11. Do not defeat the safety purpose of the polarized or grounding type plug. A
polarized plug has two blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The wide blade and or the third
prong is provided for your safety. When the provided plug does not fit into your
outlet, consult an electrician for replacement of the obsolete outlet.
12. Protect the power cord form being walked on or pinched particularly at plugs,
convenience outlets, and the point where they exit from the apparatus.
13. Use only the attachments and accessories specified in this manual.
14. If a cart is used, use caution when moving the cart/apparatus combination to
avoid injury from tip-over.
15. Unplug this apparatus during lightning storms or when not used for long periods of
time.

3
16. 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
damage, 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.
17. Do not replace fuse unless power cord is disconnected from the AC wall outlet.
18. Do not install accessories unless the power cord has been removed from the AC
wall outlet.
19. Apparatus shall not be exposed to dripping or splashing and no objects filled with
liquids, such as vases, shall be placed on the apparatus.
20. Warning –To reduce the risk of fire or electric shock, do not expose this apparatus
to rain or moisture.
21.Caution –Use of any controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure.

4
Controls and Connections for the PL-260A P.A. Amplifier
FRONT PANEL
11
12
13
14
15
16
1
2
4
5
6
7
9
10
REAR PANEL
111
2
3
4
5
6
8
7
9
10 11 12 13 14 15 17 18
16
20
19
21
22
23
24
25
26
FRONT PANEL
1) MIC-1 input jack (1/4’’ phone jack).
2) MIC-5/AUX-1 Volume control.
3) AUX-2 Volume control.
4) AUX-3 Volume control.
5) Bass Control.
6) Treble Control.
7) Zone 1-7 selector switches.
8) All zone selector switch.
REAR PANEL
1) AC power cord.
2) Ground.
3) DC input terminals for battery backup.
4) Speaker output terminals.
5) AUX output RCA jacks.
6) Preamp output RCA jacks.
7) EQ / MIX input RCA jacks.
8) AUX-3 input RCA jacks.
9) AUX-2 input RCA jacks.
10) AUX-1 input RCA jacks.
11) AUX1/MIC5 input select switch.
12) MIC-5 (XLR connector) input.
13) MIC-4 (XLR connector) input.
*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.
9) Power on/off switch.
10) Power on indicator.
11) MIC-1 Volume control.
12) MIC-2 Volume control.
13) MIC-3 Volume control.
14) MIC-4 Volume control.
15) Master Volume control.
16) Output level indicator.
14) Individual Phantom Power on/off switches.
15) MIC-3 (XLR connector) input.
16) MIC-2 (XLR connector) input.
17) MIC-1 (XLR connector) input.
18) MIC-1 VOX voice override on/off switch.
19) AC accessory outlet (Unswitched).
20) Zone output 25V/70V select switch.
21) AC fuse holder.
22) Zone 1~7 output terminals.
23) MOH output level control.*
24) MOH output terminals.*
25) TEL / PAGING input terminals. (Balanced )**
26) TEL / PAGING input level control.**

5
FRONT PANEL
1) MIC-1 input jack (1/4’’ phone jack). Accepts a balanced low impedance microphone with
a standard 1/4’’ phone plug.
2) MIC-5/AUX-1 Volume control. Adjusts audio level of MIC-5/AUX-1.
3) AUX-2 Volume control. Adjusts audio level of AUX-2.
4) AUX-3 Volume control. Adjusts audio level of AUX-3.
5) Bass Control. Low frequency tone control.
6) Treble Control. High frequency tone control.
7) Zone 1-7 selector switches. Allows for selection of individual zone paging with 70V or 25V
line output.
8) All zone selector switch. Allows for selection the All zone paging simultaneously with 70V
or 25V line output.
9) Power on/off switch. Turns amplifier’s power on and off.
10) Power “on” indicator. Indicates power is on when lit.
11) MIC-1 Volume control. Adjusts audio level of MIC-1.
12) MIC-2 Volume control. Adjusts audio level of MIC-2.
13) MIC-3 Volume control. Adjusts audio level of MIC-3.
14) MIC-4 Volume control. Adjusts audio level of MIC-4.
15) Master Volume control. Controls all volume levels simultaneously.
16) 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) DC input terminals for battery backup.Provides DC 24V input for battery backup paging
during power failure.
4) Speaker output terminals. Speaker lines must be connected to “COM” and one (and only
one) of the remaining screw terminals.
5) AUX output RCA jacks. This booster output supplies the input signal to an additional power
amplifier. This signal is after tone control and master volume control. In this fashion, very
large systems requiring more power can be accommodated.
6) and 7) 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.

6
Signal in Pre-Amplifier
PREAMP
OUT EQ/MIX
IN Power output stage Speaker
STANDARD 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
8) AUX-3 input RCA jacks. High impedance input available with parallel RCA jacks (for
combining stereo output accessories).
9) AUX-2 input RCA jacks. High impedance input available with parallel RCA jacks (for
combining stereo output accessories).
10) AUX-1 input RCA jacks. High impedance input available with parallel RCA jacks (for
combining stereo output accessories).
11) AUX1/MIC5 input selector switch. Allows for selection of either low impedance MIC5
input or high impedance AUX1 input.
12) MIC-5 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
13) MIC-4 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
14) Individual Phantom Power on/off switches. Allows for selection phantom power on or
off from MIC1 to MIC5.
15) MIC-3 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
16) MIC-2 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
17) MIC-1 (XLR connector) input. Accepts a balanced low impedance microphone signal with
an XLR connector.
18) MIC-1 VOX voice override on/off switch. MIC-1 inputs include VOX muting switch of the
MIC-2~5 and AUX-1~3 input during paging.
19) AC accessory outlet (Unswitched). Unswitched AC Auxiliary outlet for a 120VAC
50/60Hz power source.
20) Zone output 25V/70V select switch. Allows for selection of either 25V or 70V for
Zone1~7.

7
21) AC fuse holder.
22) Zone 1~7 output terminals. In addition to the normal 70V and 25V line outputs, there
are seven groups of 70Vor 25V, line terminals for 7 zones which can be selected using the
push buttons on the front panel.
23) MOH output level control. Controls volume of MOH output. (Music on hold)
24) MOH output terminals. Provided two MOH outputs 600 Ohm, 1 Volt and 8 Ohm, 1 Watt.
25) TEL / PAGING balanced input terminals. Accepts a balanced telephone paging signal.
26) TEL / PAGING input level control. Controls audio level of telephone input.
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

8
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 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 (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 preferredmethod for multi-speaker installation.

9
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 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.
PL-1
JP3
JP4
JP5
ON OFF
ONOFF
ONOFF
AUX1 AUX2 AUX3
Jumper location (on or off )to select AUX input for music on hold output.(MOH
on above diagram)
Note: Units come with jumper set AUX-1(on), AUX-2(off), AUX-3(off).

10
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

11
SPECIFICATIONS
Type Public Address Mixer Power Amplifier
Model No. PL-260A
Power supply AC 117V, 60Hz
DC 24V,12A
Rated output power 260W RMS
Frequency response
50~15 KHz ±3dB
Total harmonic
distortion 1% or less at 1 KHz at rated output
Input
sensitivity and
impedance
TEL :100mV/600 Ohm, Balanced
MIC-1~5 : 1.0mV/600 Ohm, Balanced
AUX-1~3 : 200mV/50K Ohm, Unbalanced
EQ/MIX IN : 1V/50K Ohm, Unbalanced
S/N Ratio MIC-1~5 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
Output sensitivity
and impedance AUX out : 350mV/4.7K Ohm
PREAMP out : 1V/600 Ohm
*MOH output 600 Ohm @ 1V and
8 Ohm -1Watt
**VOX level MIC-1/TEL 0~40 dB Adjustable**
Phantom Power
MIC-1~5 15 V DC
Tone control 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)
Weight Approx 26.4 lbs (12.0 kgs)
Finish Black
Mounting
options
Table top or 19” rack mountable
(Use # PBM –RK2rack mount bracket)
*MOH = Music on hold **Factory set : -40dB