OSD Audio PA-90 User Manual

PA90

PA Amplifier

TO PREVENT FIRE OR SHOCK HAZARD, DO NOT USE THIS PLUG WITH AN

EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN
BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.

TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THE APPLIANCE TO RAIN

OR MOISTURE.

(POUR PRÉVENIR UN INCENDIE OU D'ÉLECTROCUTION, NE PAS EXPOSER CET

APPAREIL À LA PLUIE OU L'HUMIDITÉ.)

TO PREVENT ELECTRICAL SHOCK, MATCH WIDE BLADE TO WIDE SLOT, FULLY

INSERT.

The lightning flash with

arrowhead symbol, within an

equilateral triangle, is intended

to alert the user to the presence

of un-insulated dangerous

voltage within the products

enclosure that may be of

sufficient magnitude to

constitute a risk of electric

shock to persons.

War ning: To reduce the risk of

electric shock, do not remove

cover (or back). No user

serviceable parts inside. Refer

servicing to qualified service

personnel.

The exclamation point within

the equilateral triangle is

intended to alert the user to the

presence of important

operating and maintenance

(servicing) instructions in the

literature accompanying the

appliance.

1. Read these instructions.

2. Keep these instructions.

3. Read all warnings.

4. Follow all instructions.

5. Do not use this appliance near water.

6. Clean only with dry cloth.

7. The Equipment shall be operated in open area.

8. Do not block any ventilation openings. Install in accordance with the manufacturer's
instructions.

9. Do not install near heat sources such as radiators, heat registers, stoves, or other
appliance (including amplifiers) that produce heat.

10. 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. If the provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet.

11. Protect the power cord from being walked on or pinched particularly at the plugs,
convenience receptacles, and at the point where they exit from the appliance.

12. Only use attachments or accessories specified by the manufacturer.

13. Unplug the appliance during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified personnel. Servicing is required when the appliance has
been damaged in anyway, such as power supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the appliance, the appliance has been exposed to rain
or moisture, does not operate normally, or has been dropped.

15. 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.

S3125A

S3125A

This appliance shall not be exposed to dripping or splashing water and no object filled with
liquids such as vases shall be placed on appliance.
L'appareil ne doit pas être exposé aux écoulements ou aux éclaboussures et aucun objet ne
contenant de liquide, tel qu'un vase, ne doit être placé sur l'objet.

Both main plug or main switch disconnect device instruction is accepted.
The mains switch is used as disconnect device and to completely disconnect the apparatus
from mains supply, the mains switch must be switched to “OFF” position and the mains switch
of apparatus should not be obstructed OR should be easily accessed during intended use. In
addition, the location of mains switch on the apparatus and its function shall be described.
Le commutateur du secteur est utilisé pour déconnecter le système. Pour déconnecter
complètement l'appareil de l'alimentation, le commutateur du secteur doit être positionné sur
«OFF». Le commutateur du secteur ne doit pas être obstrué ou doit être facilement accessible
pendant son utilisation.

PA90 PA Amplifier

Congratul ations on your purchasing o f OSD PA90 Commercial
Amplifier.

Please take a few moments t o read the ent ire manual , and b e
sure t o retain this docume nt for future refere nce. Please read
and observe a ll safety instructio ns detailed on each page .

Note: If any part of this prod uct is dam aged or missing,
please call OSD AUD IO R eturn Department at (56 2)
697-2600

The POWER push button will manua lly swi tch the PA90
Commercia l amplifier on or off.

Control Kno bs

Input Ad justmen t

Rate d input p ower: 130VA

FUSE : T1.5A /250V

230V

115V

230

PTT

24 V DC

WARNI NG:

EXPOSE T HIS EQU IPMEN T TO RAIN OR M OISTU RE

CAUTI ON:

REMOVE C OVER (O R
SERVICI NG TO QUA LIFIE D SERVI CE PERS ONNEL .

COM

8Ω

CAUT ION

RISK OF ELE CTRIC S HOCK

RISQUE DE C HOC ELE CTRIQ UE

NE PAS OUVRI R CE CART ER,

DO NOT OPEN .

TO REDUCE T HE RISK O F FIRE OR E LECTR IC SHOC K, DO NOT

TO REDUCE T HE RISK O F FIRE OR E LECTR IC SHOC K DO NOT

BACK).

NO

USER

SERVICE ABLE

70 V 10 0V

AVIS

RESERVE AU P ERSON NEL

AUTORIS E

PARTS

INSIDE .

MIC3

Gain + Gnd -

REFER

The OSD PA90 70V/100V Commerc ial Amplifier has 7 inputs :
MIC 1, MIC 2, MIC 3, AUX 1, AUX 2, AUX 3, and T EL input.
Each of the MIC inputs and AUX inputs can be adjusted the
input gain using the corresp onding con trol knob on the fron t
panel.

Output A dju stm ent

The OS D PA90 Commercial Amplifier a llows you to adjust the
output volum e, Treble and Bass by the corres ponding control
knob on the front pan el. There is a LED Met er to ind icate the
output leve l located above the POWE R pushbutton.

The OSD PA90 also has protect function. When it is short
circuit, or o ver-heating, or ove rload, t his function will be
automatic ally switched on, then the prod uct will mute and the
RED PROTECT LED indicator w ill illuminate.

The OSD PA90 als o has CHI ME and ALARM functio ns. The
ALARM has the top priority and CHIME is second over a ll the
inputs. W hen pr essing CHIME button, all inputs wi ll be
temporari ly mute and the chime sound will come out. When
pressing ALE button , you wil l start t he alarm function, t he
alarm will ke ep on r inging and will n ot automat ically sto p until
you p ress the ALE but ton again. All inp uts will b e mute
including t he CHIME tone when alarm f unction is on.

Line

Off

Phant om(24 V)

Mic

1 2

ON

TEL

Out

MIC2

In

INSERT

Line

Off

Phant om(24 V)

Mic

1 2

ON

MIC1

Line

Off

Phant om(24 V)

Mic

1 2

ON

AUX1AUX2AUX3

L

R

INPUTS

Line

Off

Line

Off

Line

MIC3

MIC2

Phanto m(24V )

Mic

1 2

1 2

ON

TEL

Gain + Gnd -

There is a tot al of 7 inputs o n the rear panel of the PA90
Commercia l Amp lifier including 3 MIC in puts, 3 AUX inputs,
and 1 TEL input wi th input gain adjustme nt.

The MIC inputs a re using balanced XLR connectors. Each MIC
input have a Lin e/Mic level DIP switch (Switch 1) and a 24V
Phantom Power Supply On/Off DI P switch (Switch 2). If the
Line/Mic DIP swi tch is swi tch ed down, t he correspond ing MIC
input i s set to accept Mic level sign al input, if the Line/Mic DIP
switch is swit che d up, the cor responding MIC input is set to
accept Line level signal input. If the Phantom Powe r Supply

ON

INSERT

Out

In

Off

MIC1

Phanto m(24V )

Mic

Phanto m(24V )

Mic

1 2

ON

AUX1AUX2AUX3

L

R

DIP switch is swi tched d own , it means the cor res ponding MIC
input will provide a 24V phantom power to the microphone, if
the Phantom P ower Supply DIP Switch is switched up, t he
correspon ding MIC input will not provide phantom power to
microphon e.

The AUX inputs are using RCA connectors. Each gr oup of AUX
input has “L ” a nd “R” as l eft chan nel and rig ht channel inputs
respectiv ely.

The TEL inpu t is using 3 pin terminal block. It allows you to
connect t elephone signal as an input of PA 90. T he TEL input
gain can be adj ust ed by the screwdriver adjust ment knob
labeled as “G ain” beside the termin al block.

The PA90 commercial amplifie r also has 1 pair of RCA
connector s used as “INSERT” in and out. The INSERT IN
connector allows to connect an external audio source to the
unit. The INSERT OUT con nector allows to l oop the input
sources of PA90 out to other dev ices.

NOTE: Th e MIC 1 Input has priori ty ov er th e oth er in puts.
When the MIC 1 Input si gnal is present, the PA90 will
automatic ally mute other inputs an d only MIC 1 Input is
available t o output.

OUTPUT

PTT

24 V DC

The OSD PA90 out put module, includi ng ( ),
24V DC ba ck up power s upply, 8 ohm output, 70V outp ut and
100V output , is using the screw termi nal connectors.

If you will use 8 ohm output , connec t the speaker’s positive

terminal to t he am plifier’s “8Ω” t erminal a nd co nnect the
speaker’s negativ e ter min al to the amplif ier ’s “C OM” t erminal.

If you will use 70V output, co nne ct the sp eak er’s po sitive
terminal to the am pli fie r’s “70V” te rminal and connect the
speaker’s negativ e ter min al to the amplif ier ’s “C OM” t erminal.

If yo u will use 100V out put , connect t he spe ake r’s p ositive
terminal to t he am pli fier’s “100V” ter min al an d connect the
speaker’s negativ e ter min al to the amplif ier ’s “C OM” t erminal.

The PPT con nec tors all ow you to connect the OSD PA90 to
external d evi ces to a ctivate the “Pu sh To Talk” funct ion . Wh en
this fu nction i s swi tch ed on , all inputs w ill b e mut e and you c an
use MIC 1 to make b roa dca sting or annou nce men t.

The 24V DC connecto rs a llow you to connect e xte rnal bac k up
power sup ply to OSD PA90 . It help s you t h use O SD PA90 in
applicati ons that must cont inu e to opera te in case of a po wer
failure or i n mobile app lications w here 115V o r 230V AC power
is not availa ble .

Note: This ampli fier wi ll s upply 6 0W t o the outpu t.
Please verify that your speakers are capable of
handling su ch power to avoid possib le damage!

COM

8Ω

70 V 1 00 V

PTT Push To Talk

PA90 P owe r Ampl ifi er Sp ecificatio ns

Power Bandw idth: 55Hz - 15kHZ
60W into 8 ohm ou tput mode with less than 1 % THD+N

60W into 70V output mode with less than 1% THD+N
60W into 100V o utput mode with less tha n 1% THD+N

Frequency R esponse: 55Hz to 15kHz , (+0dB, -3.0dB)

Signal to Noi se ratio:
Mic: better t han 55 dB
Line: bette r than 60 dB
AUX: better th an 70 dB
TEL : better than 70 dB

Input Sensi tivity:
Mic: -50 dB
Line: -20 dB
AUX: -12 dB
TEL : -10 dB

Tone Adjustmen t:
Bass: ±10 dB
Treble: ±10 dB

Power Suppl y: Switchable AC 115V /230V, DC 24V

AC Mains Fuse : T2A/250V
DC Mains Fuse : T8A/250V
Dimension s: 19.0"w x 13.3"d x 3.6"h , “2U Rack Space Style”

Limited Warranty

OSD AUDI O: warrants its amplifier prod ucts against de fects in
materials and workma nship for a li mit ed period of t ime. For a
period of two years from date of original pur cha se, we will
repair or replace the product, at our option, without charge for
parts and lab or.

Th is l im it ed w ar ra nty ap plies only t o pu rc ha ses fr om
authorize d OSD AUDIO retailers. Th is limit ed warra nty i s
extended only to the or iginal pu rchaser and is valid only to
customers i n USA.

Customers are requir ed to provi de a copy of the original sales
invoice from a n au thorized OSD AUDIO dealer w hen making a
claim against this limit ed war ranty. This limit ed war ranty only
covers failures due to defects in m ate rials or work manship that
occur during nor mal use. It does not cover failures resulting
fro m acc id ent , mis us e, a bu se, negle ct, m ishan dli ng ,
misapplic ation, alterati on, faulty installation, modification,
service by anyone other than O SD AUDIO or damage that is
attributa ble to acts of god. It do es not cover costs or
transport ation t o OSD AUDIO or damage in tr ansit. The
customer should return their defecti ve product, fre ight prepaid
and insu red, to OSD AU DIO, only afte r receiving a Returne d
Merchandi se Authorization (RMA ) number.

Th is warranty wi ll b ec ome void i f th e serial nu mb er
identific ation has been w holly or partial ly removed, alte red or
erased. Repair of replaceme nt un der t he te rms o f thi s warran ty
does not extend the terms of this warranty. Should a product
prove to be defec tive in workmanshi p or ma ter ial, the
customer’s sole remedies will be repair or replacem ent as
pr ov id ed u nd er t he terms of this warranty. Under no
circumsta nces sh all OSD AUDI O be liable for loss or damage,
direct, consequenti al or incidental, arising out of the u se of o r
inability t o use the product.

NOTE: This amplifie r is capable of use with s tandard US
voltage (115V) a s well as European volta ge (230V). The
amplifier will be preset fo r the vol tage of t he country it is
sold in. Use with other v oltages requires some changes
to be made to the amplifie r. Should y ou wish to use the
amplifier in a coun try other th an the one for which i t was
purchased , ple ase contact OSD AUDIO at (562) 697-

2600.

APPLICATIO NS

CONNECTIN G 8 OHM S PEA KERS

In this configuration, th e 8 ohm speak ers are connect ed to the
“8Ω” and “COM” terminals. The output of PA90 will then d eliver
the rated output p ower into an 8 ohm load. If you want to
connect m ultiple speak ers to PA90's 8 o hm output, the
speakers should be conn ected in series/para lle l-arrangement
to mak e the combined impedance 8 o hm or higher. Whe n
connectin g speakers, sp eakers’ positive terminal shoul d be
connected to the “ 8Ω” t erm ina l and speakers’ negative

terminal sho uld be connect ed to “CO M” ter min al for in-p has e
connectio n.

USING DC 24V PO WER S UPP LY

In this conf iguration, a DC 24V pow er sup ply is connect ed to
PA90 to help it to be used in mo bile applicati ons or in
applicati ons that mu st continue to operate in case of a AC
power failu re.

PTT

24 V DC

COM

8Ω

70 V 1 00 V

PTT

24 V DC

Note: Th e minimum working load of OSD PA90 is 8
ohm. Ma ke sure t he total imp edance should not be
lower than th at.

COM

8Ω

70 V 1 00 V

+

+

-

-

-

+

-

+

-

+

-

+

CONNECTIN G 70V C ONS TANT VO LTAGE SPEAK ERS

In this confi guration, the 70V cons tant speakers are conn ected
to the “7 0V” and “COM” terminals. The output of PA90 wi ll then
deliver the rated output p ower to the 7 0V speakers. Multip le
70 V sp eakers sh ou ld b e connect ed i n paralle l. W hen
connectin g speakers, sp eakers’ positive terminal shoul d be
connected to the “70V” te rminal and sp eak ers’ negativ e

terminal sho uld be connect ed to “CO M” ter min al for in-p has e
connectio n.

PTT

24 V DC

COM

8Ω

70 V 1 00 V

+

-

-

+

-

+

­DC 12V
Battery

+

­DC 12V
Battery

+

USING PUSH TO TALK(PTT) F UNC TION

In thi s configur ation, Mic 1 is c onnected t o “PTT” terminals to
activate the “Push To Talk” function. When “PTT” function is
switched on , all the inputs except Mi c 1 will be overruled.

signal

Line

Off

Line

Off

Line

PTT

24V D C

70V 100 V

COM

8Ω

MIC3

MIC2

Phanto m(24V )

Mic

Mic

1 2

1 2

ON

ON

Off

MIC1

Phanto m(24V )

Phanto m(24V )

Mic

1 2

ON

trigger

Note: O nly Mic 1 input c ould work wi th “Push to
Talk(PTT)” fu nction.

INSTALL U NIT IN RACK

In this configuration , the OSD PA90 is set to install in a 19"
rack. When m ount it I a rack, make sure th e mounti ng brackets
are well fixe d by the scre ws and remove the 4 feet from the
bottom of the u nit.

CONNECTIN G 100 V CON STANT V OLTAGE SPEA KER S

In t his con figurat ion, th e 100V cons tant sp eakers ar e
connected to the “100V” and “COM” terminals. The out put of
PA90 will then deliver the rat ed outpu t power to the 1 00V
speakers. Multiple 100V speak ers should be connec ted in
pa rallel. When conn ectin g speak ers, sp eakers’ posit ive
terminal should be connecte d t o t he “100V” termi nal a nd

speakers’ negat ive t erminal shou ld be conne cte d to “COM”
terminal fo r in- pha se connectio n.

PTT

24 V DC

Note: In 70V/100V consta nt vo ltage connection, the
summed spe aker power should not ex ceed the rated
PA90 o utput power.

COM

8Ω

70 V 1 00 V

-

+

-

+

-

+

Note: Ensure to install t he uni t where the ambient
temperatu re does not exceed 55°C.

If you have any questions rega rding how to set thi s up, please
call OSD AUDIO support a t [phone].

5