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MI4
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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 ni ng : 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. Do not blo ck any ventilation openings. Ins tall in accordance with the manufacturer's
instructions.
8. Do not insta ll near heat sour ces such as radia tors, heat regi sters, stoves, or other
appliance (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the p olarized or grounding type plug. A polariz ed plug
has two blades wi th on e wider than the o ther. A grounding type plug has two blades and a
third grounding prong. If the provided plug does not fit into your outle t, consult an
electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinc hed particula rly at the plugs ,
convenience receptacles, and at the point where they exit from the appliance.
11. Only use attachments or accessories specified by the manufacturer.
12. Unplug the appliance during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualified p ersonnel. Se rvicing is required when th e appliance has
been damaged in anyway, such as powe r supply cor d or plug is damaged, liquid has been
spilled or obj ects have fallen into the appliance, th e appliance has been exposed to rain
or moisture, does not operate normally, or has been dropped.
This appliance shall not be ex posed to dripping or sp lashing wate r and no object filled with
liquids such as vases shall be placed on appliance.
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MI4 Power
Congr atula tions o n you r purch asing o f OSD Pow er Amp lifie r.
Pleas e t ake a few mome nts to read th e e ntire ma nual, an d b e
sure to retai n t his docu ment for fu ture ref er enc e. Pl eas e rea d
and obs erve al l safet y ins truct ions de taile d on ea ch page .
Note: If an y par t o f t his p rod uct i s d amage d o r m issin g,
pleas e call OS D AUDIO Re turn D epart ment a t (562 )
697-2 600
The POW ER pu sh butt on will manual ly sw itch th e MI4 Power
ampli fier o n or of f. T he blu e LED b eside the bu tton i ndica te its
power sta tus. When eve r th e am plifi er ’s powe r sw itch is on, the
LED wil l illum inate b lue .
OUTPU T ADJ UST MENT
The RIGH T VOLUME an d LEF T VOLU ME knobs ar e for
indiv idual adjus tment of left c hanne l and rig ht cha nnel o utput .
The co rresp ondin g L/MA X and R/M AX LED sh ow the ou tput
level sta tus. when the out put is a djust ed t o re ach cli p, t hey will
illum inate R ED.
The BAS S GAIN kn ob is use d for a djust t he gain o f Bass fo r the
outpu t.
T3.1 5AL/2 50V
INPUT S
There is a tota l of 2 p airs o f R CA inpu t on th e rear panel of the
MI4 Po wer A mplif ier. These RCA i nputs are label ed a s “Lin e 1"
and “ Line 2". Th ey are also des igned wit h an “R” and “L” as
Right C hanne l and Lef t Cha nnel in puts re spect ive ly.
“Line 2" In put shoul d be u sed as the pr imary or no rmal inpu t for
vario us li ne leve l sou rces th at ma y be av ailab le lo cally to the
ampli fier. “ Lin e 1" In put is a pr iorit y sw itchi ng inp ut t hat ca n be
used f or a seco nd inp ut, su ch as, th e outp ut o f a secon d
sourc e, a nd will tak e over as pri mary inpu t whene ver the sig nal
is pres ent . If th e “Line 1" I nput signa l is ab sent af ter 1 2
secon ds, the i nput wi ll re vert to t he “Lin e 2" Inpu t sig nal.
The Line 2 h as “ OUT ” RC A con necto rs t o loop the Line 2 sig nal
to othe r devic es.
The M I4 Power Amp lifie r a lso p rov ides a p air of s pea ker l eve l
input label ed a s “S pe ake r In ” for thos e ap plica tions where
eithe r of th e so urces ha s on ly speak er l ev el o utput si gna l
avail able. The Speake r In signal wil l be mixed wi th Line 1 or
Line 2 input sig nal con tr oll ed by th e sw itch labe led “Line 1"
and “Li ne 2" as opt ion o n the right side of “Lin e 1" In put R CA
conne ctors .
This screw drive r adj ustme nt kn ob la beled as “ LE VEL ” can be
used to adjus t t he se nsi tivit y o f M I4 input s f rom “M IN ” to
“MAX” .
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OUTPU T
To th e r igh t o f t he Spe aker O ut conne ctors is a s wit ch label ed
:Mode ” with “S tereo ” and “Br idged ” as opti ons. It is used to
switc h the out put mod e of MI 4.
If you will be co nn ect ing a pair of spe akers to the ampli fie r,
place th e swit ch in t he “Ster eo” Po sitio n. If y ou wil l b e usin g a
pair chann els to powe r a si ngle mon o s peake r, p lace t he
switc h in the “B ridge d” po sitio n.
The M I4 Po we r Am plifi er ha s 2 chann els o utput s. Ea ch
chann el has a pa ir o f multi -wa y bi ndi ng p ost con necto rs.
These are red a nd bl ack s crew posts on t he re ar pa nel o f the
ampli fier. Ter minal s a re provi ded for “L” an d “ R” ou tpu t. If yo u
will use the am plifi er with a st ere o m ode(n ot a brid ged mo de),
conne ct t he spe aker’s po si tiv e(Red ) te rmina l to the am pli fier ’s
posit ive(R ed) term in al using the appro priat e gau ge sp eak er
wire, an d con nect the spea ker ’s ne gativ e(Bla ck) term inal to
the ampl ifier ’s ne gativ e(B lack) term ina l(imm ediat ely be si de
the posit ive ter minal ) us ing the appro priat e ga uge speak er
wire.
If you wo uld lik e to u se the am plifi er with “ Bridg ed” mod e,
place t he “ Mod e” S witch i n the “Br idged ” Posit ion to be a sin gle
chann el mono a mplif ier, the t wo c han nels wi ll b e inter nal ly
conne cted in s eries . You wil l use bot h Red ter minal s to conn ect
to th e spe ake r, the “L” chann el’ s R ed te rmina l w il l b e pos itive
termi nal and th e “R ” ch annel ’s Red termin al will be neg ative
termi nal und er “Bri dge d” mode .
Note: T his ampli fie r wi ll supp ly 130W i n “B rid ge d”
mode. Plea se ve rif y tha t y our s peake rs are c apabl e o f
handl ing suc h power t o avo id poss ible da mage!
NOTE: T his amp lifie r is c apabl e of u se w ith sta ndard US
volta ge ( 115V) as we ll a s Eu ropea n volt age (230V ). T he
ampli fier will be p res et for the vol tage of th e co untry it is
sold in. Use with other vo lta ges requ ire s s ome ch anges
to be ma de to th e a mplif ier. Shou ld yo u w ish to u se the
ampli fier in a coun try ot her than the o ne f or whi ch i t wa s
purch ased, ple ase con tact OSD AUDIO at (562 ) 697-
2600.
Limit ed Wa rra nty
OSD AUD IO: warra nts it s am plifi er pro duc ts aga inst d efe cts in
mater ials and w orkma nship for a limit ed pe riod of ti me. F or a
perio d of tw o years f rom dat e of or igina l pur chase , we will
repai r o r repl ace th e p rod uc t, at o ur optio n, wit hout c harge fo r
parts a nd labo r.
Th is l im ite d w ar ran ty app li es onl y t o p urc ha ses fr om
autho rized OSD A UDI O re taile rs. T his limit ed w arran ty i s
exten ded only to the origi nal purc haser and is valid on ly to
custo mers in U SA.
Custo mers a re requi red to pr ovi de a copy of the or ig ina l s ales
invoi ce fro m an au thori zed OS D AUDIO deale r when makin g a
claim agains t thi s lim ited wa rrant y. T his l imite d war ranty only
cover s fa ilu res due to defe cts in mate rials o r wo rkman shi p th at
occur durin g no rmal use. It does not cover failur es res ultin g
fro m acc id en t, mis u se, a bu se , n eg le ct , m is ha nd lin g ,
misap plica tion, alter ati on, fa ult y in st all ation , mo dific ation ,
servi ce by an yone ot her than OSD AUDIO or da ma ge that is
attri butab le t o ac ts of god. It does no t co ver costs or
trans porta tion t o O SD A UD IO or da mag e i n t ransi t. The
custo mer sh oul d retu rn t heir d efect ive produ ct, fr eig ht pre paid
and insur ed, to OSD AUDIO , on ly after re ce ivi ng a Ret urned
Merch andis e Author iza tion (R MA) num ber.
Th is w a rr ant y w i ll bec ome voi d i f t he s e ri al n um b er
ident ifica tion has been whol ly or part ially remo ved, alter ed or
erase d. Repa ir o f repla cemen t under t he t erm s of t his war ranty
does no t exten d the ter ms of thi s warra nty. S ho uld a pro duct
pr ove to be de fe ctive in workman sh ip or materia l, th e
custo mer’s so le r emedi es w ill be rep air or repla cem en t as
pr ovi de d u nde r t he te rms of th is w ar ra nty. Und er no
circu mstan ces sh all OSD AU DIO be li able for loss or d amage ,
direc t, conse quent ial or inci den tal, ari sing out of th e u se of or
inabi lity to u se the pr odu ct.
Note: The mi nim um imped anc e for the t ota l load
conne cted to a pair o f cha nnels i n the “Bridg ed”
mode is 8 -ohm.
MI4 Pow er Am pli fier Sp ecifi catio ns
Power B andwi dth: 20 Hz - 20 kHZ
50W per C hanne l into 8 oh ms lo ads wit h less th an 0.05 % THD +N
65W pe r Chan nel in to 4 ohms l oads w ith le ss t han 0. 1% T HD+N
130W Br idged M ono int o 8 ohm s with le ss than 0 .1% THD+N
Cross talk: > 60dB@ 1KH z, refe rred to r ated po wer a t 8 ohms
Frequ ency Re spons e: (2 5Hz to 50 kHz) +0 dB, -1. 0dB
Signa l to Nois e ratio : >98 dB
RCA Line I nput Se nsiti vit y: 220m V (Max)
Speak er Inpu t Sensi tiv ity: 2. 3V (Max )
AC Powe r Consu mptio n:
Dimen sions : 19"w x 7. 87" d x 2.85" h,
“1.5U O ption R ack S pace St yle”
Net Weight : 5.65 kg
Gross Weig ht: 6.2 5 kg
AC Main s Fuse:
115V ~60Hz T 3.1 5AL, 25 0V
230V~ 50Hz T3.15 AL, 250 V
360W (A ll Chan nels Dr ive n)
Whene ver you a re using sp eaker s outd oors, yo u s hou ld
be aware that sou nd does not tra vel lik e it wou ld be in
your ho me. Withou t the reflec tiv e surfa ces of wal ls and
ce il in gs , sound a t o utdoors wi ll di ss ip at e quickly.
Th erefo re, in an outdo or situa tion t he M I4 Power
Ampli fier p rovid es the op portu nity t o b rid ge adjac ent
chann els, effec tivel y doubl ing the a vaila ble pow er f or
your spea ker s. This can h elp to over come th e pr obl em o f
using spe akers out doors ass uming the speak ers chose n
are cap able of h andli ng th e addit ional p ower.
It sh ould be no ted that the MI 4 P ower A mplif ier i s rat ed
to op e ra te int o a mi nim um 8- ohm br idg ed lo ad.
There fore, if you ar e using more than a sin gle 8 -oh m
louds peake r in brid ged mo de you sh ould c onsid er usi ng
an imped ance matchi ng speak er sel ector, su ch as the
SSVC- 6 or possi bly us ing an i mpeda nce match ing
volum e co ntrol , su ch a s th e SVC 70, SVC 100, SVC 300,
VKR 120 , VM S 100 or VMX 30 0 in a wea therp roof
housi ng avail abl e a t y our favo rit e D IY sto re or ele ctric al
suppl y. T he ch oice of a vo lume contr ol wo uld a llow you
the additi ona l fle xibil ity of bein g abl e to att enu at e the
volum e whene ver nec ess ary.
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In th is co nf igu ratio n, th e Mod e swi tch is set to “St ereo” for
stere o op erati on. Conne ct t he l ine out jacks fro m a ster eo
pream plifi er or sourc e to the Line 2 In put jack s of your MI4
Power Am plifi er. Th en co nn ect y our spe akers t o the o utput
Bi nding Po st ob ser vi ng pr ope r p ol ar it y(You can ch ec k
“OUTP UT” on Pa ge 4 for re fer ence ab out the p olari ty) .
From
The aud io outp ut of a loc al sour ce, suc h as MP 3 Playe r, CD,
Televis ion, c om put er, et c., is conn ect ed to th e M I4 Po wer
Ampli fier via th e Li ne 1 Inp ut, and whe never the loc al s our ce i s
activ e its signal w ill tak e pri ority o ver the dist ribut ed au dio
signa l pres ent at Li ne 2. H oweve r, t he dis tri bu ted au dio si gnal
will s til l be prese nt a t the Line 2 In put. In th is c ircum sta nc e th e
audio o utput o f the loc al sour ce will b e heard v ia t he MI 4 Po wer
Ampli fier. Once the loc al s ource is turn ed o ff or muted , th e MI 4
Po wer A mpl if ier wi ll aut om ati ca lly sw itc h b ac k to th e
distr ibute d aud io sy stem as an a udi o sourc e, as sum ing the
local sourc e rema ins inact ive. The delay time is 12 sec onds
when switc h b ack t o the no rmal sourc e wil l o ccur. Thi s set up
assum es al l i nco ming signa ls ar e at line leve l a nd not at
speak er leve l.
To Speakers
In thi s conf ig ura tion, the Mo de swi tch is se t to “B rid ge d” for
Bridg ed opera tion. Co nne ct the line ou t jacks fro m a st ereo
pream plifi er or sourc e to the Line 2 In put jack s of your MI4
Power Amp lifie r. Then co nne ct your sin gle mo no speak er to
the ou tp ut Bin di ng Post o bserv ing prop er polar ity(You ca n
check “ OUTPU T” on Pag e 4 for r efere nce abo ut the po lar ity).
To Mono Speaker
In the ap plica tio n shown below, a di str ibute d audio syst em is
conne cted t o th e MI 4 Powe r Amp lifie r as a loca l zo ne amp lif ier
via th e Line 2 Inpu t. Nor mal ly the distr ibute d au di o sy stem w ill
be the au dio so urce f or t he MI4 Po wer A mplif ie r. Th e
distr ibute d au dio can be pas sed on to be us ed by addi tiona l
zones or su b zone s in the dis tribu ted sy stem via the Li ne 2
Outpu t.
If the Whole Hous e Distr ibu ted Audi o was only availa ble a s a
speak er level sign al you could co nnect it to the “Sp ea ker In”
conne ction s and set th e swit ch whi ch is on the ri ght si de of
“Line 1 " Input R CA conne cto rs to the “ Line 2" p ositi on or tow ard
to the lef t ha nd pos iti on of the s wit ch. The MI4 Po wer A mplif ier
will no longe r be abl e to pas s the Wh ole Hous e Dis tribu ted
Audio t o anoth er zone v ia th e Line 2 Ou tput.
If you ha ve any qu est ions reg ard ing how t o s et thi s up, p le ase
call OS D AUDIO su pport a t (56 2) 697- 2600.
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