impact JK 902, JK 904, JK 1300 Owner's Manual

MODEL:

OWNER’S

MANUAL

JK 902

RMS 90W x2C H CLA SS-AB AMPLIFIER

JK 904

JK 1300

RMS 90W x4C H CLA SS-AB AMPLIFIER

RMS 130 0Wx 1CH C LASS-D AMPLIFIER

Where Yo u Headed?

Thank yo u for choos ing IM PAC T JK Ser ies A mpli fier! You r choice of I MPACT JK
Series A mplifie r indicat es a des ire f or hig h quality m usic repr oduc tio n in you r

car. IMP ACT JK Seri es Amplif ier br ing s to you o ver four de cades of ca r audi o
expert ise. So whe ther y ou are a dail y driving m usic love r, or a se rio us car
audio co mpetito r, IMP ACT h as the p roduct fo r you!

To take fu ll advant age of t he IM PACT J K Series Am plifier g ear you hav e just
purcha sed, plea se rea d and f ollo w the instr uctions i n this m anu al. As w ith all
of our pro ducts, pr ofes sio nal in stallat ion by an aut hori zed I MPAC T dealer is
highly r ecommen ded! O the rwis e, the perf ormance o f your n ew ge ar may
not be sat isfacto ry.

You’re H eaded in th e Righ t Directi on with IMP ACT!

INTROD UCTION

The IMPA CT JK Serie s Amplifi er amp lif iers o ffer high q uality au dio
reprod uction fo r the au diophil e and the eve ryday lis tene r as we ll. Al l models
featur e fully var iabl e cro ssov ers with 18 d B per octav e slop es, a llow ing you
the abil ity to tail or the s oun d to bes t fit the spe akers and y our li ste ning
prefer ences.

Platin um finish c onnecti ons Ensur es sol id el ectr ical conn ections t hat re sis t
corros ion.

Fully Va riable Cr ossover s Full y var iabl e crossov ers promo te easy
instal lation an d save t he co st of ou tboard cr ossover s. Add iti onal ly, they ma y
be used in c onjunct ion wi th outboa rd passiv e or active c ross ove rs,
depend ing on the co mple xit y requ ired by the s ystem. Th e 18 dB pe r oct ave
slope of fers stee p roll -of f abov e or below th e selecte d freq uen cy.

Protec tion Circ uitry Aga inst O ver load , Short Cir cuit, The rmal , and R ever se
Polari ty. These P rote cti on fea tures are d esigned t o prot ect t he amp lifier fr om
misuse , as well as fr om com mon c ause s of amplif ier failu re.

INSTALLATION

Profes sional in stal lat ion by a n authori zed IMPAC T dealer is h ighl y
recomm ended! Ot herw ise , the pe rforman ce of your ne w gear m ay no t be
satisf actory. I n the ev ent t hat yo u decide to d o your own in stal lat ion, p lease
read and f ollow thi s manu al ve ry car efully. F ailure to d o so may c omp romi se
the inte grity of th is pro duc t, you r automob ile, and po ssib ly vo id the p roduct
warran ty.

1

Speake r outputs

Some of the se amp lifi ers ar e mult i chan nel am plif ier de sign. Meaning it h as
more than o ne channel of spea ker outputs . I t is equippe d with a larg e bloc k
style t erminal for spe aker con nec tion . Ma ke this c onnecti on c aref ully and
neatly .

Strip yo ur wire bac k and tw ist t he exp osed lead s
and inse rt them int o the bl ock termi nal while
being ca reful tha t ther e is no l oose o r frayed
strand s of wire. Ti ghte n the Allen h ead screw
down on th e term ina l till t he wire is ti ghtly
secure d in place. I f the wi res e ver co me in
contac t with each o ther t he am plif ier will go
into pro tection m ode.

Know you r total ohm l oad befor e you make an y
connec tions.

3

Instal lation In structi ons

1. Before you s tart , dis connect the n egat ive c abl e fro m the car b atte ry.
Tape up th e end so it is is olat ed fr om the b attery.

2. Run an a ppropri ate gaug e wire fr om the ba ttery to the ampl ifier. P lan this
part of the ins tall ation ca ref ully . Th is c able wil l carry v ery high cur rent. If it
should s hort to the b ody an d it is not pro perly fus ed it could c atch f ire .

3. Connec t the powe r wire t o the ba ttery using a fuse c apable of the
total cu rre nt load of all amp lif iers conn ected. Do n't inst all t he fu se ye t.
Wait unt il the end. L ocat e the f use as c lose as pos sible to th e batt ery .

4. Find t he c losest clea r metal are a to the amp for a g roun d. S and , gr ind or
scrape all pain t a nd und erco ating from the body and screw the gro und
secure ly in place .

It is advisa ble t o test the groun d with an ohmmet er betwee n the g round

cable and the nega tiv e bat tery cable to ins ure a goo d low re sis tanc e
connec tion. Som e alloys us ed in m oder n car s do not offe r the best gr ound.
If you bel ieve this i s the ca se co nsul t with the ve hicle man ufac tur er.

5. Run the spea ker wir e to the spea kers. It is advi sed that you leav e some
extra wi re at this po int. Y ou can “clea n it up”later .

6. If you hav en' t already d one so, mou nt the a mp no w.

7. Connec t the power a nd gro und to the am plifier .

You shou ld instal l the fu se at t he bat tery only a fter this s tep .

LR

BRID GE

Amplif iers are ge nera lly m ount ed in the hat ch/trun k area o f a car o r SUV, a nd
under or b ehind the s eat of m ost pick up t rucks. Se lect a loca tion t hat w ill
provid e adequat e vent ila tion f or the ampl ifier. Av oid mo unt ing th e amplifi er
with the f ins facin g down . The fins sh ould be fac ing up, eit her ve rti call y or
horizo ntally. S ecur e the a mpli fier with t he screws p rovi ded .

WARRANTY!

Before s ecuring t he amp lif ier, i nspect th e mountin g loca tio n care fully to en sure
that you d o not drill i nto or d amage any e lectric al, hydra ulic , flu id, or f uel lines .

2

Input Se ction

Becaus e of t he w ide r ange of h ead unit outpu t co nfig ura tion s al l IM PACT
amplif iers have an adju stable inpu t g ain (sen s). The gain is not a volum e o r a
power lim iting cont rol like a thro ttle . I t make s t he amp more sen siti ve to inp ut
from the stere o. Wit h the ga in up the amp will rea ch ful l outp ut at a lower
volume s etting on the deck. A t hig her gain se ttings the amp also b ecomes mo re
sensit ive to noise fro m the ca r's elec tri cal sys tem . Try to ru n the ga in at the
lowest s etting po ssib le fo r your s ystem.

There is n o correct g ain se tti ng. As
speake rs requir e diff ere nt pow er
demand s to reach th e same o utp ut, th e
gains mo st often ne ed to be u sed t o
compen sate for th ese di ffe renc es. If
you try to s et all the ga ins at h alf w ay you
would pr obably fi nd the s yst em doe sn' t
sound ve ry good. Us ing go od judgme nt
and list ening car eful ly to e ach sp eaker is
still th e best way to t une a sy ste m.

Crosso ver contr ols

A crosso ver is a devi ce tha t rem oves u nwanted f requenc ies fr om a sp eake r or
amplif ier. A twee ter ca n eas ily be d estroye d by bass fre quen cie s if the y are
not filt ered out. L ikew ise a s ubwo ofer will n ot sound na tura l if it i s play ing
midran ge notes. A c ross ove r remo ves these s ounds fro m the sp eak er as yo u
might gu ess.

Carefu l adjustm ent in n eed ed to en sure
that all t he speake rs are p lay ing th e
right so unds and th at you with have lef t
no “holes”o r low spots i n the
freque ncy respo nse.

R

L

FRON T

REAR

INPU T

SENS

MIN MA X

LINE O UT

REAR

L

R

MAX

INPU T

FRON T

SENS

MIN MA X

X-OV ER

FREQ

40Hz 400Hz

L

R

X-OV ER

LPFHPF F LAT

INPU T

FRON T