OWI AMP1SGRN User Manual

OWI INC USER MANUAL: Model: AMP1SGRN

GREEN AMPLIFIER WITH PRIORITY OVERRIDE

E252969

17141 Kingsview Ave. Carson CA 90746-1207 USA

Tel. [phone] Fax [phone]

Established 1978

OWI Incorporated

[e-mail]

www.owi-inc.com

Technical Support 310-515-1900

OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

PROPRIETARY NOTICE

The OWI Inc. product information and design disclosed herein were originated by and are the property of OWI
Inc. OWI Inc. reserves all patent, proprietary design, manufacturing, reproduction, use and sales rights thereto,
and to any article disclosed therein, except to the extent right(s) are expressly granted to others.

COPYRIGHT NOTICE
This manual is Copyright 2010, 2011 by OWI Inc. All rights reserved. Reproduction in whole or in part without
written prior permission from OWI, Inc. is prohibited.

UNPACKING AND INSPECTION NOTICE
Immediately upon receipt of the equipment, inspect the shipping container and the contents carefully for any
discrepancies or damage. Should there be any, notify the freight company and OWI, Inc. or the dealer where
purchased at once.

LIMITED WARRANTY

1. This product has been thoroughly tested and inspected at the factory. It is warranted for one year from the
date of purchase.
IT IS THE OWNERS’ RESPONSIBILITY TO ESTABLISH THE DATE OF PURCHASE BY ACCEPTABLE
EVIDENCE AT TIME SERVICE IS SOUGHT.

2. Any unit, which in the judgment of OWI INC, is defective or develops defects under normal use will be replaced

or repaired without cost within the warranty period.

3. This warranty will be considered void if the unit is dropped, misused, abused and altered in any manner,

overdriven with excess amplification exceeding manufacturer’s specification, improperly serviced or
accidentally damaged.

4. OWI Inc. shall have no liability whatsoever for consequential damages. The sole responsibility at the discretion

of OWI Inc. under this warranty shall be limited to the repair of the product or replacement thereof. Any and all
implied warranties including the implied warranty of merchantability are limited to the duration of this express
limited warranty.
OWI, Inc. is NOT liable for incidental or consequential damages of any kind.

5. IMPORTANT: This warranty is void unless the attached card is completed and mailed to OWI Inc. within 10

days following the date of purchase. Units must be sent to OWI Inc. or to the dealer where purchased.

RETURN SHIPPING INSTRUCTIONS, Obtain a RETURN AUTHORIZATION from:
OWI Inc., 17141 Kingsview Ave, Carson, CA 90746.
Phone [phone], Fax [phone]

FCC Notice: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his or own
expense.

Modifications not expressly approved by the manufacturer could void the user’s authority to be operated under
FCC rules.

Written for OWI Inc. by Stan Hubler, Smartsciences

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

Table of Contents

Description Page

Proprietary, Copyright Notices 2
Unpacking and Inspection 2
Warranty Information 2
Return Shipping Instructions 2
Table of Contents 3
Important Safety Instructions 4 - 6
Introduction 7 - 8
Specifications 9 - 11
Illustration: Connection and Control 12
Chained Self Amplified Speakers Wiring 13
One, Two, Four Speaker Combination Wiring 14
Non-Priority Input Connectors Wiring 15
Priority Input Connectors Wiring 16
Speaker Out / RJ45 / Power Wiring 17
RJ45 Pin-Out 18
RS232 firmware 19
Installation 20 - 23
Operation 24 - 25
AMP1SGRN and MC4 Wiring Diagram 26
Maintenance 27
Trouble Shooting Guide 27

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

IMPORTANT SAFETY INSTRUCTIONS

____________________________________________________________________________________________________

RISK OF ELECTRIC SHOCK - DO NOT OPEN

____________________________________________________________________________________________________

CAUTION

NOTE: Installation is to be completed by a qualified electrical technician according to
NEC/CEC code and applicable local codes.

CAUTION: The power supply is not to be used in air handling spaces.
CAUTION: To reduce the risk of electric shock: Do not remove the cover or back: No

user-serviceable parts inside: refer servicing to qualified personnel.
The lighting flash with arrowhead within an equilateral triangle is intended to alert the

user to the presence of uninsulated “dangerous voltage” within the product’s enclosure
that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user of the
presence of important operating and maintenance (servicing) instructions in the
literature accompanying the appliance.

The apparatus shall not be exposed to dripping or splashing and that no objects filled
with liquids, such as vases, shall be placed on the apparatus.

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions. All the safety and operation instructions should be read
before this OWI product is operated.

2. Keep these instructions - The safety and operating instructions should be kept for
future reference.

3. Heed all warnings - All warnings on this product and in these operating instructions
should be followed.

4. Follow all instructions - All operating and other instructions should be followed.

5. Do not use this apparatus near water - for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, near a swimming pool, or a swamp.

6. Clean onl y with dry cloth.

Continues on next page

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

IMPORTANT SAFETY INSTRUCTIONS (Continued)

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions. - This OWI product should be situated so that its location or position
does not interfere with its proper ventilation. For example, the component should not
be situated on a bed, sofa, rug, or similar surface that may block any ventilation
openings, or placed in a built-in installation such as a bookcase or cabinet that may
impede the flow of air through ventilation openings.

8. Do not install the unit near any heat sources such as radiators, heat registers, stoves
or other apparatus (including amplifiers) that produce heat.

9. 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 wider blade or the third prong is 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 they exit the apparatus.

11. Only use attachment/accessories specified by the manufacturers.

Portable Cart Warning

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. The user should not attempt to service this OWI product beyond
those means described in this operating manual. All other servicing should be
referred to the OWI Service Department.

Continues on next page

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

IMPORTANT SAFETY INSTRUCTIONS (Continued)

15. WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus

to rain or moisture.

16. To prevent electric shock, do not use this polarized plug with an extension cord,

receptacle or other outlet unless the blades can fully be inserted to prevent blade
exposure.

17. Exposure to extremely high noise levels may cause permanent hearing loss.

Individuals vary considerably in susceptibility to noise-induced hearing loss, but
nearly everyone will lose some hearing if exposed to sufficiently intense noise for a
period of time. The U.S. Government’s Occupational Safety and Health
Administration (OSHA) has specified the permissible noise level exposures shown
in the following chart. According to OSHA, any exposure in excess of these
permissible limits could result in some hearing loss. To ensure against potentially
dangerous exposure to high sound pressure levels, it is recommended that all
persons exposed to equipment capable of producing high sound pressure levels
use hearing protectors while the equipment is in operation. Ear plugs or protectors
in the ear canals or over the ears must be worn when operating the equipment in
order to prevent a permanent hearing loss if exposure is in excess of the limits set
forth here.

18. OWI recommends that this apparatus be placed on a switched power outlet, one that

switches both sides and has contact separation of at least 3 millimeters.

End of IMPORTANT SAFETY INSTRUCTIONS

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

Introduction

The OWI AMP1SGRN is a self powered speaker/amplifier. This unit can drive up to four

speakers connected series parallel to have a net impedance of 8 ohms. With an included UL

Listed, Level 5 (Energy Star), 15 volt, 3.5 ampere power supply, the amplifier can output 32

watts, or 8 watts per speaker in a four speaker hook-up.

Special features of the OWI Mode AMP1SGRN include:

Energy Star Sleep Mode

If no audio is present on any input for a nominal, factory set, delay time of 2 minutes, the
power amplifier is put into a low power “shutdown” mode. The delay time is settable, but for
Energy Star rating, the maximum time is 30 minutes, the factory set time is 2 minutes. During
sleep mode, power consumption of the speaker amplifier is less than one (1) watt. The power
supply, during sleep mode, draws a very small power.

Three audio inputs: Normal, Auxiliary and Priority Override

The Normal input accepts a balanced input via a Phoenix style screw terminal plug (A9) or an

unbalanced input via minijack A12. The A12 input can be microphone level or line level, set by
A10. The line level can range from -20dBu to 0dBu. The microphone level input can be

-40dBu. The minijack can accept mono or stereo inputs. The stereo channels are summed

together. This audio is adjusted with potentiometer adjacent to “Auxiliary Input”. This input is
muted during Priority Override. One use of the auxiliary input is for an infrared microphone.

Priority Override Feature

The Priority input accepts balanced input levels of jumper selected 100 volts audio, 70 volts
audio, 25 volts audio and 1 volt (approximately line level) audio. Audio on the Priority input
suspends audio on the Normal or Auxiliary input and switches the speaker amplifier to pass
the Priority audio (A8). After the Priority audio stops, the unit waits a selectable time delay
before returning to the Normal or Auxiliary audio input. The delay is computer settable via

RS232 from 5 to 60 seconds. With an adapter, the USB connector on a computer can be used
to set the delay.

Self Test Feature

This unit self tests itself by looking for a disconnected speaker string or otherwise high
impedance. The self test occurs when either a manual button is pressed or when it is
commanded by a computer. A good test is signaled by two flashes of a green LED and an
RS232 output of “OKAY”. A bad test is signaled by two flashes of a red LED and an RS232
output of “FAIL”. The test uses a low frequency sine wave and it senses the audio current
before and during the low frequency sine wave. The self test doesn’t interfere with the other
audio inputs and outputs.

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

Bass and Treble Controls (Equalization)

The bass and treble controls are located at A16. The bass control is closest to the auxiliary
gain pot. The controls are centered for flat frequency response and turned right for a 10dB
boost and turned left for a 10dB cut. The factory settings of the bass and treble controls are in
the center position (for flat response).The 10dB bass boost and cut occurs at 50 Hz. The 10dB
treble boost and cut occurs at 10 kHz.

Balanced Line Level Output

A nominal 0dB level, balanced output is available at terminal board A7. The source of this
output is either pre-master fader or post-master fader, selectable by jumper JMP3 which is
located under the component board, directly under the equalization pots. The master fader
(Master Volume) is potentiometer A2, accessible under the grill. The equalization feature is not
available on the balanced line level output during pre-master fader operation.

Power Amplifier Features

The power amplifier outputs 2 times 16 watts or 32 watts total into 8 ohms and 15VDC power.
Higher power is available but not Energy Star. The class D power amplifier has reduced
radiated electromagnetic interference (EMI) due to a special feature of the power amplifier,
operating in a patented spread spectrum. The power amplifier protects itself from over­temperature, over-current, over-voltage conditions. The power amplifier will shut itself down
during these conditions.

Infrared Wireless Microphone / “Auxiliary Input”

A 3.5mm connector is available to connect an infrared receiver. This receiver picks up an
infrared signal from a special wireless microphone. The wireless microphone is interrupted by
priority audio. There is a level adjustment pot on the circuit board to balance the microphone
audio level against other audio input levels. Any line level may be input here.

RS232 Operation (19,200 baud, 8N1) Via the RJ45 (A5) Connection

The RS232 allows remote Self Test, reading of audio current, setting timers, verifying
Priority/Normal state and verifying active vs. sleep state. The RJ45 also allows connection to
the power input and connection to the normal audio input. An adapter is needed to connect to
a male RS232 DB9 connector. An additional adapter is needed to go from the DB9 connector
to a USB connector. The computer needs to have the driver for the adapter loaded into the
computer. Optional digital volume control is selected via RS232.

IMPORTANT NOTE! This amplifier is intended for audio use only! Continuous sine
wave drive into a load will cause the amplifier to shut itself down when it heats up.

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

SPECIFICATIONS (MODEL AMP1SGRN)

Mechanical “UL rating is dependent upon use of the Backcan and Tile Bridge”

Speaker Diameter 6.5 inches

Weight of Amplifier/Speaker Assembly 2.9 pounds

Height of Amplifier/Speaker Assembly 4.5 inches

Power Supply Weight 0.45 pounds

Power Supply Size 4.7”H x 2”W x 1.2”D

Backcan UL Listed Enclosure
“Suitable for use in air handling spaces”

Tile Bridge UL Listed Support Truss

“Suitable for use in air handling spaces”

Electrical, Power Supply - UL Listed, Level 5

(Energy Star):

CAUTION: The Power Supply is not to be used in air handling spaces.

Input 100 to 240 VAC, 50-60 Hz, 1.4A

Output 15 VDC, 3.5 amperes

Electrical, Amplifier

Input voltage, nominal (25 watts) 15 volts DC

Input current, operating (15VDC) 1.667 amperes peak

Input volt-amperes, peak (15VDC) 25 volt-amperes

Input voltage, maximum 16.5 volts, DC

Continues

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

SPECIFICATIONS (MODEL AMP1SGRN) (Continued)

Electronic, Amplifier

Frequency Response,

EQ set to flat 50Hz to 15 kHz

Bass ±10dB@50Hz

Treble ±10dB@10kHz

THD + Noise <1% at 15 watts, “A” weighted

S/N >90 dB

Max Power Output (15V in) 2 times 16 watts or a total of 32 watts

DC Power, Standby 1.5 watts

AC Power, Sleep Mode (Energy Star) less than 1 watt

DC Power,

Short Circuit protected Yes

Over current protected Yes

Over voltage protected Yes

Over temperature protected Yes

Minimum Load Impedance 4.0 Ω (Two 8 Ω speakers in parallel)

Minimum Input impedance, Priority in 20,000 Ω

Minimum Input impedance, Bal. Line in 820 Ω

Minimum Input impedance, mini-jack 2300 Ω

Dynamic Mic input impedance 300 Ω

Warranty 1 year

Continues

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

SPECIFICATIONS (MODEL AMP1SGRN) (Continued)

SPEAKER SPECIFICATIONS

Impedance 8 ohms

Sensitivity 87dB SPL 1 w/m

Dispersion 140°

Max. Power 50 watts *

Nominal Power 25 watts

Frequency Response 65 Hz -20 kHz

Woofer Size 6.5”

Tweeter size 0.5”

Dimensions 8.75”

Cut Out Size 7 11/16”

Weight 2.51 pounds

*Note: Maximum power requires the replacement of the
15 volt supply with a 22 volt supply and Energy Star and
UL approvals no longer apply.

End of Specifications

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

SPEAKER WIRING DIAGRAM

AND “A” DESIGNATOR LOCATIONS

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

NON-PRIORITY INPUT CONNECTORS WIRING

Note: Auxiliary Input is the same as STEREO LINE IN, immediately below.

STEREO LINE IN

LEFT

RIGHT

GROUND/COMMON

MICROPHONE IN

HIGH

LOW

SHIELD

1/8" MINI-PHONE PLUG

TIP
RING

SLEEVE

1/8" MINI-PHONE PLUG

TIP
RING

SLEEVE

Plug into Symbol
A12, a 1/8" mini-jack

The a mp lifie r
converts t h e ster eo
signal to mono.

Plug into Symbol
A12, a 1/8" mini-jack

BALANCED MICROPHONE IN/
BALANCED MONO LINE IN

UNBALANCED MONO LINE IN

UNBALANCED MONO LINE IN

HI
LOW

SHIELD

HI
LOW

SHIELD

HI
LOW

TERMINAL BL OCK

A9

+

3

_

2
1

TERMI NAL BL O CK

A9

+

3

_

2
1

TERMI NAL BL O CK

A9

+

3

_

2

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1

Continued on Next Page

OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

PRIORITY INPUT CONNECTORS WIRING

BALANCED MICROPHONE IN/
BALANCED MONO LINE IN

HI
LOW

SHIELD

UNBALANCED MONO LINE IN, TWISTED PAIR

HI
LOW

SHIELD

PRIORITY

TERMI NAL BLO CK

A8

+

3

_

2

1

PRIORITY

TERMI NAL BLO CK

A8

+

3

_

2

1

PRIORITY

UNBALANCED MONO LINE IN, TWISTED PAIR

HI
LOW

TERMI NAL BLO CK

A8

+

3

_

2

1

WIRING DIAGRAM: CONNECTOR FOR BALANCED LINE OUTPUT

BALANCED MONO LINE OUT

HI
LOW

SHIELD

TERMI NAL BLO CK

A7

+

3

_

2

1

Continued on next page

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

SPEAKER OUT / RJ45 / POWER WIRING

The SPEAKER OUT terminal block identifiers are AB and EF.
Terminal blocks labeled CD and GH are jumper connectors used for four speaker operation.
See pages 12 and 14 for connection details:

Note: The RS232 connection is made via the RJ45 Connection, below.

TERMINAL

SPEAKER OUT

HIGH +

LOW --

BLOCK

A

+
_

B

RJ45 CONN E CTION

RS-232

RS-232
RS-232RXGND
POWER+
POWER­SHIELD
LINE /MIC IN+
LINE /MIC IN-

TX

P5

1

2

3

4

5

6

7

8

RJ45

Plug i nt o A 5

POWER +15V TO +22V

HIGH +

2

+

LOW --

_

1

.

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

RJ45 PIN-OUT

TIA/EIA-

568-B.1­2001 T568B

Wiring

Pin# Function Color Code DE9 (Was DB9)

1 RS232 TX White/Or 3 Transmit into PC Receive
2 RS232 RX Orange 2 Receive into PC Transmit
3 RS232 Gnd White/Grn 5 Ground
4 Power +15VDC Blue
5 Power Ground White/Blu
6 Shield Ground Green
7 Line In+, TB1-3 White/Brn Non-Priority
8 Line In-, TB1-2 Brown Non-Priority

Cable Wiring Schemes

Plug Receptacle

7 6 5 1

CAT5/CAT3 Jack

Non Traditional Board Layout

Note: The RJ-45 connector is on the
component side. Shown here are the
pins poking through from the component
side of the board to the solder side of the
board. But the connector pin-out is standard
as pictured above.

8 4 3 2

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

The Green Speaker Amplifier RS232 firmware

RS232 settings are 19,200 baud, 8 bits, no parity, 1 stop bit (8N1) . N

8,19200,No,1,No

INPUT RS232 COMMANDS:

USER CHOICES MENU (Via Hyperterminal or Putty)

Press:

0 For self test
1 To set time after audio stops and before sleep, in 2 to 30 minutes.

Note: energy star maximum is 30 minutes; factory set time is 2 minutes.

2 To set delay time (2 to 60 seconds) for priority to normal delay.
3 To switch volume control from under the grill to RS232 control.
4 Future.

Note: to change audio volume press 1 (down) or 2 (up) outside of this menu.

5 To set/reset optional solid state relay.
6 To see moving display of relative power amplifier current.
7 To reboot.
8 Future.
9 To return to main (necessary to see selection results.)
T For time until sleep in seconds.

Note: you will have 1 minute to make a choice. If the menu times out, press U or u to restart.

0 Self test Supervision The Selftest routine reads the existing audio current, as a reference, then

sends a low frequency signal through the power amplifier and reads the resulting current. The
difference is compared to a known reference. The self test verifies that a speaker and its cable is

okay (only self test with “0”).

1 Sleeptime This the time from when audio stops and the unit goes to sleep. Factory set is 15

minutes, Energy star maximum is 30 minutes. Sleeptime is settable from 2 to 30 minutes.

2 Priority-to-Normal delay time. Settable from 2 to 60 seconds. It starts counting when priority audio

stops, and flashes the red LED each second. On the computer, time left is shown.

3 RS232 Volume Control Switch chooses between the speaker grill volume control and an

electronic volume control allowing 128 volume steps.

4 Future. To set the electronic volume control, press keys 1 and 2 when not in the menu.
5 Solid State Switch Press the 1 key to turn on the relay and 2 key to turn the relay off. The sleep

mode overrides the control and turns the relay off.

6 Audio Current Reading Samples power amplifier current twenty times at 1 second intervals.
7 Reboot Restarts the Green’s on board computer.
8 Future.
9 Main Return Sends the Green’s on board computer to the beginning of the program, “Main”.
T Time Until Sleep returns the time until sleep in seconds.

An adapter for the DB9 to USB connection is ATEN UC-232A.

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

INSTALLATION

NOTE: Installation is to be completed by a qualified electrical technician according to

NEC/CEC code and applicable local codes.

Installation Instructions for Speaker Combination Model AMP1SGRN

The AMP1SGRN carton includes:

1. One (1) each AMP1SGRN (In-ceiling “Green” Amplified Speaker)

2. One (1) each UL Listed, Level 5 (Energy Star) Power Supply

3. One (1) each IEC Power Cord

4. Four (4) each Mounting screws

5. One (1) each cardboard template

6. One (1) each User Manual

The AMP1SGRN Combination carton includes items 1 to 6 above plus:

1. UL Listed 8 ohms in-ceiling speaker model IC6

2. UL Listed Backcan Enclosure (See Pages 22 & 23)

3. UL Listed Tile Bridge (See Pages 22 & 23)

*Note: Quantity of Ceiling speakers, tile bridge and backcan depends on the SKU of the

AMP1SGRN Combination Program.

Speaker Placement

Before installing your OWI speakers, consider the placement carefully, taking into effect the

location of electrical, plumbing and other fixtures.

Placement in Ceiling

OWI speakers should be located above the primary listening area.

Mounting your OWI speakers

Determine the best area to mount your OWI speakers. It will be necessary to run your speaker

wires to that location. This location must be free of obstructions, such as electrical conduits,
HVAC ducts, or water lines.

Be sure the mounting surface is between 3/8 and 1 ¼ inches thick and that there is at least a

2 ¾ inch clearance behind the mounting surface. Make sure that no objects block the back of
the speaker.

Remove the round cardboard disc from the template supplied and keep it for later use as a

paint mask, if you decide to paint your speakers.

Use the template to mark the position for the mounting hole at the selected location. If you are
not certain that no obstruction exists (electrical wiring, plumbing, etc.), you should start by
cutting a small hole in the center of your penciled mounting hole with a drywall or keyhole saw,

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

cutting at a 45 degree angle towards the inside of the hole. Cutting a small hole at this angle
will make drywall repair much easier. Once you have determined there are no obstructions in
your desired mounting location, start cutting the finished hole at a 90 degree angle to the
ceiling surface.

Route the speaker wires from your amplifier to your opening. Avoid routing the speaker wire
near electrical wires. If you have to run them parallel, make certain to space the speaker wires
at least 2 feet from the AC line. Do not nail or staple the speaker wire.

Prepare Your OWI Speakers for Mounting
Insert a paper clip into one of the grille openings, then pull upwards to remove the grille.

Turn the mounting tab 90° and push toward the grill. The grill will safely pop off.

Be sure to position the four Mounting Tabs on your OWI speaker inward then insert the

four (4) screws (supplied) from the front of the speaker into the screw opening.

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OPERATION

OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

Refer to page 12 for “A” number locations.

1.) At location A8 set the dip switches for the expected input audio signal: 100 volts audio, 70
volts audio, 25 volts audio, or LINE LEVEL audio. This is the Priority.

2.) Input using a computer brings up the menu and select 2. Set the time, in seconds, from 5 to

60.

3.) At location JMP3 (located under the component board, directly under the equalization
pots), JMP3 jumper affects the Line Level Output. The Pre-Fader position is not affected by
the Master Fader which is the Main Speaker Volume Control. The Post-Fader position is
affected by the Main Speaker Volume Control.

4.) The slider switch A11 chooses whether both inputs A12 and A9 are available or whether
A12 shorts out A9.

5.) The slider switch, A10 chooses the expected non-interrupt signal level: microphone level or
line level.

6.) The condition indicator red/green LED and the Main Speaker Volume Control are on a
separate small printed circuit board. The function of the small printed circuit board is allow
access to both the Main Speaker Volume Control from inside the grill, and to make the
red/green LED visible, from below (ceiling mounted).

The meanings of the LED indications are below.

7.) Condition Indicator LED, Table of States

Normal Operation ......................................... Steady green

Self Test Result OK ..................................... Two blinks of green

Self Test Result Fail ..................................... Two blinks of red

Sleep Mode .................................................. Quick green flash

Priority Override ........................................... Steady Red

Priority Override Timeout Countdown .......... Red flash every second

8) Version Indicator LED, Power Up Only

Firmware Version Number, First Digit .......... Green flash

Firmware Version Number, Decimal Point ... 1 Second pause

Firmware Version Number, Second Digit ..... Red flash

9) Power On Indicator LED, DS2 ...................... Power On Indicator (On PCB, Red)

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Operation Continues

OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

OPERATION

10) Controls

A2 .................................................... Main Speaker (Grill) Volume Control

A8 .................................................... Priority Input Level Select & Input

A10 .................................................. Non-Priority Input Mic/Line Level Select

A11 .................................................. Non-Priority Input Select

A16 .................................................. Bass Adjust, ± 10dB

Beside A16 ...................................... Treble Adjust, ± 10dB

Auxiliary Audio Input Level Set ........ Located next to A16

(Wireless Microphone)

Manual Self Test .............................. Located on the “Self Test” option board

11) Self-Test Details. Self-Test can be manual or computer triggered. This test looks for

disconnected speakers or speakers whose voice coil is open. The test supplies a low
frequency sine wave to the power amplifier. The current drawn by the unit due to the
signal going through the speakers is monitored. If at least one 8 ohm speaker is
connected, the circuit will test and the green LED indicator will flash four times. Otherwise,
the Red LED will flash four times. Also, the unit will output an RS232 signal: “Self Test is
OK” if good and “The self test failed”, if bad. The test signal is approximately 20 to 25
Hertz, and at a very low level. A push button, located on the “Self Test” option board,
allows a manual initiation of self-test with the same indications. The baud rate of the
RS232 signal is 19,200. The protocol is 8 N 1 (8 data bits, no parity and 1 stop bit).

12) Priority return to Line input delays is settable by computer from 5 seconds to 60 seconds.

13) Sleep Mode: During this mode, the unit draws less than 1 watt from the power supply, and

thus qualifies for the “Energy Star” rating.

14) Priority Override: Additional notes: During priority override, A9, A12 inputs are switched off.

When the audio priority ceases, a timer begins to count second by second. When the timer
reaches the preset time, the unit returns to the non-priority input. But, if during the timer
operation, the priority audio reappears, the unit’s input is immediately switched back to the
priority and the timer is reset.

Notes: There are two master volume controls: one on the main circuit board and one on the

small, attached circuit board with the LED on it, this is the primary control.
If the Priority Level pot is at minimum, the Priority Interrupt becomes Priority Mute, where all
audio is suspended so that another system can send Priority Audio.

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

The RS232/RJ45 connections are shown on Page 17
NOTE: RS232 Operation is detailed on pages 18

MAINTENANCE

The primary preventative maintenance is to make sure that that the power supply and unit are

powered and that all connections are secure.

TROUBLE SHOOTING GUIDE
No Audio

Look at the Control Indicator LED for at least 15 seconds, if it doesn’t light at all there may be a

power failure. Check circuit breakers. Check to see that the unit’s DC power supply is plugged
in to the AC power. Check to see that the power supply’s DC connector plug is secured onto
the wire and then check to see that it is plugged into the unit’s DC input connector.

You Have Power but No Audio

>Check for disconnected speakers or open voice coil.
>If the LED is briefly flashing every few seconds, the unit is in sleep mode because no audio is

being sensed at either Normal input, Auxiliary input or the Priority input.

>Initiate self test. If the LED blinks red, check the cables running to the speaker(s).
>If the LED is blinking red every second, it is recovering from a Priority Override. When it times

out, and there is non-priority, audio, you should hear audio. If still no audio, the non-priority
audio may be silent, but the LED should be green, awaiting the resumption of audio.

You want to verify unit start-up and possibly the firmware revision number.

Interrupt the AC or DC power, wait 10 seconds, then turn the power back on again, and then

look at the Control indicator LED. You should see one of the following the sequence:

Version No.:
Firmware Version Number, First Digit……………. Green flash
Firmware Version Number, Decimal Point………. 1 second pause no LED on.
Firmware Version Number, Second Digit ... ………Red flash
Pause
Steady Green
The unit then should be operational.

End of Manual Text

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OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override

Model: AMP1SGRN

Established 1978

OWI Incorporated

17141Kingsview Ave. Carson CA 90746-1207 USA

Tel. [phone] Fax [phone]

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