Crossfire CF28: Experience superior sound with this meticulously crafted 8-inch stamped frame subwoofer. Built in Southern California, it boasts high power handling, small enclosures, and clean output. Enjoy deep bass extension and practice safe listening levels to protect your hearing. Whether you prefer sealed, vented, or bandpass enclosures, the CF28 delivers versatility and performance.
Crossfire CF28: Experience superior sound with this meticulously crafted 8-inch stamped frame subwoofer. Built in Southern California, it boasts high power handling, small enclosures, and clean output. Enjoy deep bass extension and practice safe listening levels to protect your hearing. Whether you prefer sealed, vented, or bandpass enclosures, the CF28 delivers versatility and performance.
LIMITED
WARRANTY
T
his warrant
y
g
ives
y
ou specific le
g
al ri
g
hts, and
y
ou ma
y
also have other ri
g
hts which var
y
from state to state. Thi
s
warranty is only valid on
C
ross
fi
re products purchased in the U.S.A. from an authorized
C
ross
fi
re dealer. All
C
ross
fi
re products are warranted to be free from defects in materials and workmanship under normal use an
d
serv
i
ce
d
f
or a per
i
o
d
o
f
(
3
)
years w
h
en t
h
e un
i
t
i
s
i
nsta
ll
e
d
b
y an aut
h
or
i
ze
d
C
ross
fi
re
deale
r
.
N
o
n-
au
t
ho
r
i
z
ed
deale
r
i
nsta
ll
e
d
pro
d
ucts carry a
(
1
)
year parts an
d
l
a
b
or
li
m
i
te
d
warranty. T
h
e extent an
d
con
di
t
i
ons o
f
C
ross
fi
re
’
s
li
m
i
t
ed
warranty are as
f
o
ll
ows:
i.
C
rossfire w
ill
e
i
t
h
er repa
i
r or rep
l
ace
(
at
i
ts' opt
i
on
)
an
y
un
i
t w
hi
c
h
C
rossfire
has
e
x
a
m
i
n
ed
a
n
d
fou
n
d
t
o
b
e
d
e
f
ect
i
ve an
d
un
d
er warrant
y
, to t
h
e or
igi
na
l
purc
h
aser, prov
id
e
d
t
h
e
d
e
f
ect occurs w
i
t
hi
n
(
3
)
y
ears o
f
t
h
e
d
ate o
f
p
urc
h
ase w
h
en t
h
e un
i
t
i
s
i
nsta
ll
e
d
by
an
authorized
C
rossfir
e
d
ea
l
er. T
hi
s warrant
y
i
nc
l
u
d
es
b
ot
h
parts an
d
l
a
b
or an
d
a
a
pplies to the ori
g
inal purchaser onl
y.
ii.
C
rossfir
e
will either repair or replace
(
at its' option
)
an
y
unit which
C
rossfire has examined and found to
b
e defective and under warranty, to the original purchaser, provided the defect occurs within (1) year of the date o
f
p
urchase when the unit is installed by a
non-authorized
C
ross
fi
r
e
dealer. This (1) year warranty includes both part
s
n
a
nd labor and applies to the original purchaser only
.
iii
. T
hi
s warranty w
ill
b
e vo
id
to any un
i
t
f
oun
d
w
i
t
h
t
h
e or
i
g
i
na
l
f
actory ser
i
a
l
num
b
er remove
d
, a
l
tere
d
or
d
e
f
ace
d
. A
ll
un
i
ts rece
i
ve
d
b
y
C
ross
fi
r
e
f
or warranty w
i
t
h
t
h
e
i
r or
i
g
i
na
l
ser
i
a
l
num
b
ers remove
d
w
ill
not
b
e repa
i
re
d
a
n
d
returne
d
to sen
d
er
f
re
igh
t co
ll
ect.
i
v. T
h
e
p
rov
i
s
i
ons o
f
t
hi
s warrant
y
s
h
a
ll
not app
ly
to pro
d
ucts use
d
f
or an
y
i
n
d
ustr
i
a
l
, pro
f
ess
i
ona
l
or
c
ommercial purposes or an
y
other uses for which it was not desi
g
ned.
v. This warranty does not cover costs for removal of product for repair or reinstallation of the product af
t
e
r
f
f
repair, nor does it cover the cost of returnin
g
the product to
C
rossfir
e
’
s
service center for repair
.
vi
. T
hi
s warranty
d
oes not app
l
y to repa
i
rs or rep
l
acements necess
i
tate
d
b
y any cause
b
eyon
d
t
h
e contro
l
o
f
C
ross
fi
re
.
Inc
l
u
di
ng,
b
ut not
li
m
i
te
d
to, any ma
lf
unct
i
on,
d
e
f
ect or
f
a
il
ure cause
d
b
y or resu
l
t
i
ng
f
rom unaut
h
or
i
ze
d
serv
i
ce or parts,
i
mproper ma
i
ntenance, operat
i
on contrar
y
to
f
urn
i
s
h
e
d
i
nstruct
i
ons, s
hi
pp
i
n
g
or trans
i
t acc
id
ents,
i
ncorrect power
li
ne vo
l
tages,
fi
re,
fl
oo
d
or any ot
h
er acts o
f
nature, or norma
l
wear an
d
tear
.
vii
. T
h
e
f
ore
g
o
i
n
g
i
s
i
n
li
eu o
f
a
ll
ot
h
er expresse
d
warrant
i
es an
d
C
rossfire
d
oes not assume or aut
h
or
i
ze an
y
p
art
y
to assume
f
or
i
t an
y
ot
h
er o
blig
at
i
on or
li
a
bili
t
y
. T
h
e
d
urat
i
on o
f
an
y
warrant
i
es w
hi
c
h
ma
y
b
e
i
mp
li
e
d
by
l
aw
(i
nc
l
u
di
n
g
t
h
e warrant
i
es o
f
merc
h
anta
bili
t
y
an
d
fi
tness
)
i
s
li
m
i
te
d
to t
h
e term o
f
t
hi
s warrant
y
. In no event s
h
a
ll
C
rossfire
b
e
li
a
bl
e
f
or spec
i
a
l
,
i
nc
id
enta
l
or consequent
i
a
l
d
ama
g
es ar
i
s
i
n
g
f
rom o
blig
at
i
ons un
d
er t
hi
s warrant
y
d
ue t
o
c
auses beyond its control. Some states do not allow limitations on how long an implied warranty lasts and/or do not
a
llow the exclusions or limitation of consequential damages, so the above limitations and exclusions may not apply t
o
yo
u
.
v
iii
.
Return pol
i
c
y
Y
our un
i
t w
ill
b
e serv
i
ce
d
f
ree o
f
c
h
arges on an
i
n-warranty
b
as
i
s on
l
y. I
f
i
mproper operat
i
on occurs, contact your
au
th
o
riz
ed
C
ross
fi
r
e
dealer for assistance with the return and factory repair of you
r
C
ross
fi
re
p
roduct. If an
au
t
ho
r
i
z
ed
C
rossfir
e
d
ea
l
er
i
s not ava
il
a
bl
e, t
h
e
f
o
ll
ow
i
n
g
proce
d
ure must
b
e
f
o
ll
owe
d
: p
h
one
(
562 906-0800
)
or
f
a
x
(
562 941-2294
)
i
n
y
our name, a
dd
ress, te
l
ep
h
one
/f
ax num
b
er an
d
t
h
e mo
d
e
l
num
b
er o
f
t
h
e
i
tem to
b
e returne
d
t
o
rece
i
ve a return aut
h
or
i
zat
i
on num
b
er. Your return aut
h
or
i
zat
i
on num
b
er must
b
e c
l
ear
ly
wr
i
tten on t
h
e outs
id
e o
f
t
h
e
p
ac
ki
n
g
b
ox returne
d
to
C
rossfire. A
ll
returne
d
pro
d
ucts must
b
e accompan
i
e
d
by
a
d
ate
d
purc
h
ase
i
nvo
i
ce or t
he
p
ro
d
uct ma
y
b
e su
bj
ect to costs o
f
parts an
d
l
a
b
or. Return t
h
e un
i
t, prepa
id
posta
g
e,
i
n t
h
e or
igi
na
l
protect
i
ve carton or
a
carton with ample protection. Please include a brief description of the problem and send the unit to:
1
2222 Be
ll
Ranc
h
Dr
.
S
anta Fe Spr
i
ngs, CA 90670
Con
g
ratulations and thank
y
ou for choosin
g
Crossfire Car Audio. You have
j
ust selected a meticulousl
y
c
rafted 8 inch stamped frame sub woofer. The CF28 is built in our own factory located in Southern,
California. This woofer is a great example of the results when the finest quality materials and machining
p
rocesses come together. Thank you again for your purchase and Enjoy the Music!!!
Cross
fi
re rea
li
zes t
h
at
b
u
ild
qua
li
ty on
l
y ma
k
es up
h
a
lf
t
h
e
d
r
i
ver, so we ma
d
e sure t
h
e secon
d
h
a
lf
was
p
ure per
f
ormance. So w
h
et
h
er you are
l
oo
ki
ng
f
or
hi
g
h
power
h
an
dli
ng, sma
ll
enc
l
osures, an
d
l
ots o
f
cl
ean output, t
hi
s
i
s t
h
e per
f
ect
d
r
i
ver
f
or
y
ou.
S
tam
p
ed Frame Baske
t
Polymica Cone and Inverted Dust Ca
p
Four layer, 1.5" Voice Coi
l
Cotton Sp
id
e
r
One P
i
ece Bac
k
p
l
ate
/
Po
l
e P
i
ec
e
-Bumpe
d
an
d
Vente
d
M
otor
B
oot
C
omputer Mo
d
e
l
e
d
Spec
ifi
cat
i
ons
High
Power Han
dli
n
g
1
.0" Pea
k
to Pea
k
Excurs
i
o
n
E
xtremel
y
Small Sealed Enclosure
s
S
EALED E
NC
L
OSU
RE
S
:
E
asy to
d
es
i
gn, s
i
mp
l
y constructe
d
b
oxes ma
k
e no comprom
i
ses
f
or power
h
an
dli
ng or per
f
ormance.
P
ROS
i
nc
l
u
d
e easy to
b
u
ild
,
hi
g
h
power
h
an
dli
ng, exce
ll
ent trans
i
ent response, goo
d
d
ampen
i
ng, an
d
goo
d
d
eep
b
ass extens
i
on.
C
ONS
i
nc
l
u
d
e
l
ow e
ffi
c
i
ency.
****
H
i
ghly Recommende
d
V
E
N
TED E
NC
L
OSU
RE
S
:
S
omew
h
at comp
l
ex, vente
d
b
oxes use a tune
d
port to exten
d
t
h
e
l
ow
f
requency response o
f
t
h
e su
b
woofer while increasin
g
efficienc
y
. PROS include hi
g
h efficienc
y
, low distortion above tunin
g
frequenc
y
,
g
ood transien
t
r
esponse, and hi
g
h power handlin
g
. CONS include erratic cone movement below the tunin
g
frequenc
y
, complexit
y
of the box
d
esi
g
n, and lar
g
e enclosure requirements.
*
**Recommende
d
4th
O
RDER BA
N
DPA
SS
:
F
or exot
i
c
l
oo
ki
ng,
hi
g
h
output enc
l
osures, 4t
h
or
d
er
b
an
d
passes o
ff
er a var
i
ety o
f
a
d
vantages o
f
b
ot
h
sea
l
e
d
an
d
vente
d
enc
l
osures. PROS
i
nc
l
u
d
e reasona
bl
e trans
i
ent response,
hi
g
h
e
ffi
c
i
ency, goo
d
d
eep
b
ass extens
i
on
(
w
i
t
h
t
h
e
c
orrect enc
l
osure
)
, an
d
hi
g
h
power
h
an
dli
ng. CONS
i
nc
l
u
d
e very comp
l
ex
b
ox
d
es
i
gns, poor
d
ampen
i
ng c
h
aracter
i
st
i
cs, an
d
l
arge
e
n
c
l
osu
r
e
s
iz
es.
***R
eco
mm
e
n
ded
IN
FI
N
ITE B
A
FFLE: S
i
mp
l
e
d
es
i
gn us
i
ng t
h
e trun
k
o
f
t
h
e car
f
or an enc
l
osure an
d
e
i
t
h
er t
h
e rear
d
ec
k
or a
b
a
ffl
e sea
l
e
d
o
ff
b
e
hi
n
d
t
h
e rear seat to e
li
m
i
nate any soun
d
wave cance
ll
at
i
on. PROS
i
nc
l
u
d
e easy
i
nsta
ll
at
i
on an
d
a
d
equate
b
ass response
f
or s
i
mp
l
e
systems. CONS include 40% to 60% less power handling, poor dampening characteristics, substandard transient response, and
e
xtremel
y
low efficienc
y
.
N
ot Recommended
!
SUBWOOFER ENCLOSURE CONSTRUCTION:
A
we
ll
b
u
il
t spea
k
er
b
ox
i
s essent
i
a
l
f
or goo
d
per
f
ormance, regar
dl
ess o
f
w
hi
c
h
d
es
i
gn you c
h
oose. Cross
fi
re recommen
d
s t
h
e use o
f
3
/4
”
hi
g
h
d
ens
i
ty part
i
c
l
e
b
oar
d
or 3
/4
”
MDF
f
or max
i
mum r
i
g
idi
ty. Des
i
gn your spea
k
er enc
l
osure, remem
b
er
i
ng to a
dd
t
h
e vo
l
ume o
f
t
h
e
woo
f
er an
d
t
h
e port
i
nto your measurements. Ma
k
e a
l
ayout o
f
t
h
e p
i
eces you nee
d
to cut to ma
k
e t
h
e most out o
f
your s
h
eet o
f
woo
d
.
T
a
k
e
y
our t
i
me to cut t
h
e woo
d
w
i
t
h
prec
i
s
i
on to
i
nsure proper
fi
t. Pre-
d
r
ill
an
d
counter s
i
n
k
screw
h
o
l
es
b
e
f
ore assem
bli
n
g
to preven
t
y
our wood from splittin
g
. Screws should be no more than three inches apart. Usin
g
a staple or nail
g
un is an acceptable option ove
r
screws, but space them no farther than 1.
5
”
apart. Glue all seams with wood
g
lue and screw or staple the pieces ti
g
htl
y
to
g
ether. Use a
d
amp towel to wipe excess
g
lue awa
y
. Cross brace an
y
lar
g
e walls of the enclosure that ma
y
resonate. Run
y
our speaker wire into the box
b
y
d
r
illi
ng a
h
o
l
e
j
ust
l
arge enoug
h
f
or your w
i
re to
fi
t t
h
roug
h
. Ports use
d
i
n your enc
l
osure s
h
ou
ld
b
e roun
d
e
d
on
b
ot
h
top an
d
b
ottom
i
ns
id
e e
d
ges to prevent no
i
se
d
ue to tur
b
u
l
ence. S
ili
con or cau
lk
a
ll
seams, aroun
d
ports, an
d
w
i
re
h
o
l
es to assure no
l
ea
k
s. I
f
necessary,
n
ow
i
s t
h
e t
i
me to app
l
y t
h
e exter
i
or touc
h
es to your enc
l
osure w
h
et
h
er you are app
l
y
i
ng pa
i
nt, carpet, v
i
ny
l
or any ot
h
er mater
i
a
l
to
b
eaut
ify
y
our new enc
l
osure. C
h
ec
k
t
h
e c
h
art
f
or
d
amp
i
n
g
mater
i
a
l
b
e
f
ore
y
ou screw
y
our woo
f
ers
i
n. It ma
y
b
e necessar
y
to a
dd
t
h
e
d
ampenin
g
material to the enclosure that
y
ou have chosen. Once
y
ou have screwed
y
our woofers in place make a final check for leaks.
T
h
e Cross
fi
re CF28
i
s capa
bl
e o
f
pro
d
uc
i
ng soun
d
pressure
l
eve
l
s
i
n
excess o
f
120
d
B. Cont
i
nuous ex
p
osure to soun
d
p
ressure
l
eve
l
s over 120
d
B
may cause temporary an
d
somet
i
mes permanent
h
ear
i
ng
l
oss. H
i
g
h
powere
d
sy
stems ma
y
produce levels well over 130dB. Use
g
ood
j
ud
g
ement an
d
p
ractice safe listenin
g
levels
.
Practice Safe Sound
Practice Safe Sound
Mec
h
an
i
ca
l
Features
Performance Feature
s
SPEAKER ENCLOSURES
SPEAKER ENCLOSURES
Internal volume: 1.05ft3 / 29.74L
Tuning frequency: 34Hz
Port (D x L): 3" x 13.16"
-3dB response: 40Hz
Efficiency: 88.4dB
Maximum power handling: 150watts
Cu. feet/liters “Q” -3dB Efficiency PE
small sealed volume:
. .35/9.91 1.16 68.1Hz 87dB 150 watts
large sealed volume:
.8/22.66 .87 53.5Hz 88.7dB 150watts
Optimum Sealed Volume
Internal volume: .6ft3 / 16.99L
Enclosure "Q": 0.95
-3dB response: 42Hz
Efficiency: 87.5dB
Maximum power handling: 150 watts
Optimum Vented Volume
Cu. feet/liters Tune to Port -3dB Efficiency PE
small vented volume: .8/22.66 37Hz 3” x 14.84” 48Hz 89dB 150watts
large vented volume: 1.39/39.4 32Hz 3” x 10” 36Hz 88dB 300watts
Front volume: .5ft3 / 14.1L
Rear volume: .42ft3 / 11.89L
Tuning frequency: 80Hz
Port (D x L): 3" x 3.4"
-3dB response: 50 - 112Hz
Efficiency: 92dB
Maximum power handling: 150w
Optimum Bandpass Volume
Front cu. ft/liters
Rear cu.ft/liters
Tune to Port -3dB Efficiency PE
.75/21.24 .4 / 11.33 77Hz 4” x 4.2” 53 – 102Hz 94dB 150watts
.53/15.01 .67/18.97 72Hz 3” x 4.38” 46 – 97Hz 90.5dB 90watts
15" 9.13"
12.5"
20.5" 9.46"
13.5"
12.5" 19.17"
12.5"
The most common damping materials used are Dacron and Polyfill. Reclaimed fiber underlay has been discovered to be an excellent
substitute especially when glued directly to the walls of the enclosure. Fiberglass may be used, but please limit usage to sealed
enclosures only. When used in vented/bandpass enclosures, fiberglass fibers escaping through the port may be hazardous to your
health.
DACRON/POLYFILL UNDERLAY FIBERGLASS
SEALED ENCLOSURE loosely fill the enclosure line 5 walls line 5 walls
VENTED ENCLOSURE line 3-5 walls line 1-3 wall Please limit the use of
BANDPASS (sealed chamber) line 3 walls line 1-3 wall fiberglass to sealed
BANDPASS (vented chamber) line 1 wall (optional) line 1 wall (optional) enclosures only
DAMPING MATERIAL
DAMPING MATERIAL
Rating the power handling of subwoofers is not a difficult task. However, understanding power ratings is often
confusing. Many times the Maximum Power Ratings are viewed as the RMS power handling of the driver, when in
actuality Maximum is generally the break point of the driver. This has lead Crossfire to come up with a system to
rating the power necessary to drive our subwoofers. Please read the following cautiously before choosing your
amplifier.
Nominal power handling
-Nominal power handling is the power rating given by Crossfire at which the subwoofer will experience
minimal mechanical degradation over time when using a recommended enclosure. In other words, this is the
recommended power to be used per woofer to assure long life.
Maximum power handling (PE)
-Maximum power handling is the power rating given by Crossfire at which the subwoofer could experience a
high amount of mechanical degradation that may lead to possible failure over time when using a
recommended enclosure. In other words, do not exceed this power level for extended periods of time.
Dynamic power handling
-Dynamic power handling is the power rating given by Crossfire for peak transients and short bursts.
Continuous playing at or above this level will cause mechanical failure and/or thermal failure. In other
words, this power level should never be attained with the exceptions of approved SPL competition vehicles.
This could possibly void your warranty.
ENCLOSURE RECOMMENDATIONS
ENCLOSURE RECOMMENDATIONS
Model CF28
Driver description 8” Subwoofer, Single Voice Coil
Mounting depth, in./mm 3.5/88.946
Cutout dimensions, in./mm 7.88/200.254
Impedance 4 ohms
Nominal power handling 100 watts
Maximum power handling (PE) 150 watts
Dynamic power handling 300 watts
Voice coil – size 1.5”, 4 layer
Magnet weight 20 oz.
Frequency response 26Hz to 1200Hz
Resonance frequency (fs) 38Hz
QTS .570
QMS 3.879
QES .668
VAS, ft./liter 1.09/31.13
X-max, in./mm .157/4
Efficiency (2.83V/1M) 86dB
7.25" 6"
Front Rear
*Note: Dimensions given require the use of 0.75" (19mm) board.
**Be sure to add in .026ft3 / .736L for driver displacement in all "Other" enclosures.
SPECIFICATIONS
SPECIFICATIONS
POWER RATINGS
POWER RATINGS
-
1
-
2
Crossfire CF28: Experience superior sound with this meticulously crafted 8-inch stamped frame subwoofer. Built in Southern California, it boasts high power handling, small enclosures, and clean output. Enjoy deep bass extension and practice safe listening levels to protect your hearing. Whether you prefer sealed, vented, or bandpass enclosures, the CF28 delivers versatility and performance.
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