4 | JL Audio - 300/4v3 Owner ’ s Manual
5
1 4) Ma ke nec es sa r y adjus t ments t o t he i nput
sen sit iv it y c ontro ls to obt a i n t he r ig ht
overa ll ou tput a nd t h e desi re d ba la nc e
in t h e sy ste m. S ee App end i x C (page s 16, 1 7)
for t he rec omm ende d input s ens iti v it y
sett ing method.
15 ) Enjoy t he f r uit s of you r la bor w it h you r
favor ite mu sic.
POWER CONNECTIONS
Befor e in st a l l in g t he a mpli f ie r ,
di sc onn ec t t he neg ati ve (g rou nd) w i re
f rom t he veh icle ’ s b at ter y. Th is w i l l pre vent
acc ident a l d a mage t o t he sy st em, t he ve hic le
a nd you r per son du ri ng i n st a l lat ion.
+12VDC Ground Remote
Front F ilter Controls Front Input Section Front Speaker Outputs
Bridged
Left Right
Rear Speaker Outputs
Left Ch. Right Ch. Filter Fr eq. (Hz)
Filter Slope
Freq. Range
Input Voltage Input Sens. Input Mode
12dB
|
24dB
Filter Mode
Off
|
LP
|
HP
x1
|
x10 Low
|
High
Rear Input Section
Left Ch. Right Ch.
Input Voltage Input Sens.
Low
|
High 2ch
|
4ch
50
60
75
95
1 30
200
500
30 0 / 4v3
Four-Channel Full-Range Amplifier
Rear Filter Con trols
Filter Fr eq. (Hz)
Filter Slope Freq. Range
12dB
|
24dB
Filter Mode
Off
|
LP
|
HP
x1
|
x10
50
60
75
95
1 30
200
500
+ 1 2V Battery Connection
Y ou w i l l nee d to con nec t a p ower w ire t o
t he veh icle ’ s p osit ive b at ter y t er mi na l , usi ng a n
appropr iate power r i ng or spe ci a li z ed b at ter y
ter m in a l con nec tor, such a s t he J LAud io
X B -BTU or X D -BTS . T h is c onne c ti on mus t
be t ig ht a nd cor ros ion-fre e to en su re prope r
con nec t iv it y. Th is w i re M UST be f u se d
appropr iate ly for s afe t y . A ny power w i res r u n
t hr oug h met a l ba r r iers (such a s f i rew a l ls), m us t
be prot ec ted w it h a h ig h qu a l it y i nsu l at in g
gr omm et to pre vent da m age to t h e in su lat ion
of t he w i re. Fa i lur e to do so m ay resu lt i n a
da nge rous s hor t ci rc uit .
Pow er Wire Requirements
Th e 30 0/4v3’ s “+1 2 V D C” a nd “Grou nd ”
con nec t ions a re d esi gne d to ac ce pt 4 A W G power
w ire . 4 A WG pure copp er w i re is re com mend ed
for a ny power w i re r un l onger t ha n 72 i nc hes (1 8 0
cm). For ru ns sho r ter t ha n 72 i nc hes , 8 A WG pure
copp er power w i re i s acc ept abl e.
If you a re i ns ta l li ng t he 3 0 0/4v3 wit h ot he r
a mpli f ie rs a nd w is h to u se a si ng le ma i n p ower
w ire , u se 2 A WG or 1/0 A W G pu re copp er
w ire a s a ma i n p ower w ire . T hi s 2 A W G or
1/0 A WG power w i re shou ld te rm i nate i nto a
f us ed d is t ri but ion bloc k mou nted a s clo se to
t he a mpli f i ers a s po ssib le a nd shou ld con ne ct t o
t he 30 0/4v3 wit h 4 A WG or 8 A WG pu re copp er
powe r w i re .
Plea se not e t hat lower A WG numbe rs me a n
big ger w i re a nd v ice -versa (1 /0 A WG is t he l ar ges t,
2 A WG is sm a l ler, then 4 A WG, t hen 8 A WG, etc .) .
W e do n ot rec ommen d the u se of “copp er-
cla d a lum i num w ir e” or “C CA ” w i re be cau se
t his w i re i s sig ni f ic a ntl y les s conduc ti ve th a n
pure c opper w i re . On ly us e pure c oppe r power
w ire , suc h as J LAud io’ s Prem ium Power Wi re .
Tin ned c oppe r wi re (sil ver color) is ac cep tabl e as
t he ti n-pl ati ng i s onl y a ver y m inor c omponent
of t he w ire .
Fuse Requirements
Th e in st a l lat ion of a f u se on t he m a in
power w i re, w it hi n 18 wi re i nche s ( 4 5 cm)
of t he po sit ive bat te r y ter m i na l is v it a l to
prote ct t he w i re a nd t he ve hic le f rom f i re i n
t he eve nt of a col l ision or s hor t-ci rcu it . T he
f us e va lue at e ac h power w i re shou ld b e jus t
hi gh e noug h for a l l of t he e qu ipment bei ng r u n
f rom t hat power w i re. Do not us e a f u se w it h
a va lue t h at fa r exc ee ds t h e tota l f us e rat i ng
of t he ele ct ron ic s con nec te d to t he w i re.
If on ly t he 3 0 0/4v3 is bei ng r u n f rom t hat
power w i re, we re com mend a 4 0A f u se be
us ed . AGU (big g la ss f u se) or Ma x i Fus e™ ( big
plastic-body f use ) ty pes are reco mmended.
If ot he r a mpli f ie rs a re a l so be in g powere d f rom
a ma i n power w i re a nd exc ee d 80 a mp s in t ota l
f us e rat i ng , we rec om mend t he u se of a n A N L
(l a rge-b lad e ) f u se a nd ho lder at t he b at ter y plu s
a f us ed d is t ri but ion bloc k nea r t he a mpl i f ier s.
Ea ch a mpl if ier mus t be f u se d in dep endent ly a t t he
out puts of t he f u se d power d i st r ibut ion bloc k . W e
rec omme nd appropr iat ely r ated M a x i Fus e™ f u ses
a nd a JL Aud io f us ed d i st r ibut ion bloc k .
Plea se c onsu lt w it h you r J L Audio
dea ler to ma k e su re t hat t he w i re , f us e
holder a nd f u se r at i ngs a re appropr ia te for
you r sy ste m’ s nee ds . T he sa fe t y of you r
in st a l lat ion d epe nds on ap propri ate p ower
con nec t ions a nd f u se pro tec t ion.
PRODUCT DESCRIP TION
Th e JL Aud io 30 0/4v3 is a fou r-cha n nel f u l l-
ra nge a mpli f ie r ut i li z in g pate nted A bso lute
Sy mm et r y ™ Cla s s A/ B te ch nolog y for a l l
cha n nel s. A l l c ha n nels b enef it f rom JL Aud io’ s
exc lusive R .I. P .S . power s upply de sig n w hic h
opt i mi z es t h e out put of e ach c ha n nel p ai r for any
imp ed a nce b et we en 1.5 a nd 4 oh ms p er ch a nne l.
Th e 30 0/4v3 ca n be op erat ed i n t he
follow i ng mode s:
1 ) As a f u l l-s y stem a mpl i f ier i n bi-a mp mo de w it h
one pa i r of cha n nel s d ri v in g subwo ofers i n low-
pa ss mo de (75W x 2 or 150W x 1 ) a nd t he ot her
pa i r of cha n nel s dr i v in g ma i n spe a ker s i n hi gh-
pa ss mo de (75W x 2 ).
2) As a fou r-c ha n nel sat el l ite a mpl if ier i n a
bi-amplif ied system, del ivering hig h-passed
sig na l s to f ront a nd rea r s pea ker s ys tem s.
Th e 30 0/4v3’ s f le x ible i nput a nd cro ss over
se ct ion s per m it oper at ion w it h a w ide v a ri et y
of sou rce u n its a nd s y stem c onf ig u rat ion s. T he
30 0/4v3 ca n ope rate w it h a s in g le pa ir o f stere o
input s or w it h s epa r ate i nputs for f ront a nd re a r
cha n nel s, i f t he s ou rce u nit i s equ ipp ed w it h f ront
a nd rea r out put s.
TYPICAL INST ALLA TION SEQUENCE
Th e fol low ing r epre sent s t he se quenc e for
a t y pic a l a mpl if i er i nst a l la tion , us ing a n
a f ter ma rk et sou rc e un it or OE M Inte r fac e
proc es sor ( li k e t he Cle a nSwee p® CL 4 41 d sp).
Add it iona l st eps a nd d i f ferent pro ce dure s may
be re qui re d in s ome appl ic at ions . If you h ave
a ny que st ions , ple as e cont ac t you r aut hor i ze d
JL Aud io dea le r for as si st an ce.
1) D isc on nec t t he ne gat ive b at ter y pos t
con nec t ion a nd se cu re t he d i scon ne ct ed c able
to preve nt acc ident a l re- con nec t ion du ri ng
insta llat io n. Th is st ep is not opt iona l !
2) Ru n power w i re f rom t he b at ter y lo c ati on
to t he a mpl if ier mou nt in g loc at ion, t a k i ng
ca re to r oute it i n such a w ay t hat it w i l l
not be d a ma ged a nd w i l l not i nter fere w it h
veh icle op erat ion . 4 A W G is re com mend ed
for w ire r u n s gre ate r t ha n 72 i nche s ( 180
cm) in len g t h. Use of 8 A WG power w i re is
acc ept ab le for shor ter r u n s, su ch a s fr om a
power d is t ri but ion bloc k to t he a mpl if ier or
f rom a t ru n k-mounted b at ter y. Use a 2 A WG
or 1/0 A WG ma in p ower w i re w it h a fused
power d is t ri but ion bloc k when a dd it iona l
a mpli f ie rs a re be in g in st a l led w it h t h e 30 0/4v3
a nd powere d fr om t he sa me m a in p ower w i re.
3) C onne ct p ower w i re to t he po sit ive bat t er y
pos t. F us e t he w ir e w it h a n appropr iate f u se
bloc k ( a nd c on nec tors) wit h i n 18 inche s ( 45
cm) wi re len g t h of t he po sit ive bat t er y p ost .
Th i s f us e is e ss ent ia l to prot ec t t he veh icle .
Do not i nstall the fuse until the po we r wire
ha s be en con nec te d to t he a mpl i f ier.
4) Ru n sig n a l ca bles (RC A ca bles) and re mote
tu r n-on w i re f rom t he s ou rce u n it or inte r fac e
proc es sor to t he a mpl i f ier m ount i ng loc at ion .
5) Ru n s pea ker w i re f rom t he sp ea k er s yst ems t o
t he a mpli f i er mou nti ng lo c ation .
6) Find a go od , sol id , ba re me ta l g rou nd i ng
poi nt clos e to t he a mpl i f ier a nd c onne c t t he
negat ive p ower w i re to it u sin g appropr iat e
ha rdwa re . Use m in i mu m 8 A WG power w i re,
no longer t h a n 36 i nche s ( 90 c m) or 4 A WG
w ire u p to 60 i nc hes ( 150 cm) long f rom t he
a mpli f ie r to t he g rou nd con nec t ion po int . In
some veh ic les , it may b e nec es sa r y to up gr ad e
t he bat te r y’s grou nd w i re a s wel l. (Se e pag e 6
for imp or ta nt not ic e ).
7) Se cu rely m ount t he a mpl i f ier u si ng
appropriate ha rdwa re.
8) Con ne ct t he r emote t u rn- on w i re a nd t he
pos iti ve a nd negat i ve power w i res to t he
a mpli f ie r’ s power c onne ct or plug. T hen i n ser t
t he power c onne c tor plug i nto t he a mpl if ier’s
power c onne ct or rec ept acl e, pu sh in g f i rm ly.
9) C onn ec t t he RCA i nput ca bles
to t he a mpl if ier.
10 ) Con ne ct t h e spe a ker w i re s to t he sp ea k er
con nec tor plu gs a nd i nse r t t he plugs f ir m ly
into t h e spe a ker c onn ec tor rec ept ac les .
1 1 ) Ca ref u l l y rev ie w t he a mpl if ier’s control
se tt i ngs t o ma ke s ur e t hat t he y ar e set
acc ord in g to t he nee ds o f t he sy ste m.
12 ) Ins ta l l p ower w i re f us e ( 4 0A for a
si ng le 30 0/4v3 ) a nd re con nec t t he ne gat ive
batter y post term ina l.
13 ) T u rn on t he s ou rce u nit a t a low level
to double -c hec k t hat t he a mpl i f ier i s
con f ig u re d cor rec t ly. Resi st t he te mptat ion
to cr a n k it up u nti l you h ave ver if ied t he
cont rol se t t in gs.