COMPETITION™ & FREEAIR™
The new c-series KICKER Competition™ and Freeair™ drivers feature the latest
advancements in loudspeaker design from Stillwater Designs, the most
famous name in car audio subwoofers.

FEATURES OF KICKER C-Series DRIVERS
Hemispherical Polymineral Cone w/ - High rigidity under pressure for accurate linear control
ISD™ (Inverted Structural Dome) - Stops enclosure pressure loss to reduce “pump-down”- High internal dampening- Excellent sunlight, pollution and moisture resistance
Double Stitched Surround - Prevents cone/surround separation at high excursionsBlackened Pole Piece - Improved heat transfer
Uniplate™ - Improved thermal and magnetic transfer between
pole and backplate
Extended Pole Piece - Cooler operation increases power handling- Improved magnetic field linearity around the voice coil gap
Vented Pole Piece - Pressure relief under the center dome improves low bass
Extended Backplates - Prevent damaging voice coil “bottoming”
Perimeter Venting - Measurably lower operating temperature andfreer cone motion
Hi-Temp Kapton Voice Coil Formers - Protects against warped, rubbing voice coils
Long Throw Voice Coil - Enormous cone excursion capabilities
High Power Lead Wires - Stops lead breakage- Reduces power robbing resistance losses

INSTALLING YOUR NEW KICKER DRIVER
Enclosure construction: Your enclosure should be made of 1/2" (8" drivers and smaller) or
3/4" (10" drivers and larger) material, minimum. Avoid low density materials such as commonparticle board. The recommended materials are high density particle board, medium density
fiberboard (MDF) or high quality, void free 7-or-13-ply plywood such as marine plywood.
Include glue blocks to strengthen the corners of your box, and add cross-braces if you detect
panel vibration. Use quality wood glue such as Elmer’s Professional or Titebond (NOT silicone
rubber, hot glue or caulk!), and seal inside joints with a pressed-in bead of silicone rubber to beabsolutely certain that no air leaks exist. If your design includes multiple woofers operated athigh power, seal each woofer in its own enclosure.
WARNING! - the use of silicone rubber to seal in a woofer will void your warranty! If any sealingis needed in addition to the speaker’s gasket, use caulking cord or vinyl weather strip.
Loosely fill a sealed box about half full with polyester fiber (typically used as pillow filling). Linethe inside of a vented box with 1" fiberglass insulation.
Schedule 40 PVC pipe is recommended for making port tubes for vented enclosures. The pipeshould be “roughed up” before gluing it into the box with silicone rubber or epoxy. The inside
end of the vent should be at least one diameter from the nearest cabinet wall. Rounded edges
on the vent can be useful in reducing vent “chuffing” noises.
Remember to observe polarity. Hooking up one or more woofers in reverse phase will
drastically reduce bass output.

FREEAIR MOUNTING
The specialized design of KICKER Freeair woofers allow these speakers to work effectively in
infinite baffle applications. This does not mean, however, that the driver doesn’t need anenclosure. What it means is that the “enclosure” can be of very large
volume, such as a car door, dash, rear panel or trunk. In these applications the driver needs arelatively rigid panel to mount to, as excess vibration will color the sound and reduce efficiency.
Also, the panel should effectively “seal” the air behind the panel from the air in front of it. If
your mounting panel doesn’t meet these two requirements, you may need to modify it withbracing or an additional panel “sandwiched” onto it in some manner. Dash mountings are almost
impossible to “seal”, however this is not too critical since the drivers used in this application are
for midbass and midrange and only low bass performance is sacrificed.
KICKER Freeair woofers are also well suited for use in vented enclosures. When used in theirrecommended enclosures, these woofers exhibit a “boosted” bass response which is often
popular for rap or rock music.

POWER HANDLINGPower handling ratings on Competition and Freeair woofers reflect the largest power
amplifiers suitable for use with each speaker model. We feel that this rating is more useful tothe consumer than misleading “music power”, “continuous” or other ratings often used.
Stillwater Designs’ power ratings are based on “clean” power, with minimal amplifier clipping.
Amplifier clipping produces an extremely distorted signal that is capable of destroying drivers
and may void your warranty.

RECOMMENDED ENCLOSURESThe table below shows suitable enclosures for Competition and Freeair drivers. F3 values
listed indicate the -3 dB “down-point” of the system. Fb represents the tuning of the ventedenclosure. Remember that while a vented speaker has a slight theoretical advantage in output,
a sealed enclosure produces more low bass because of its much slower roll-off below the -3 dBpoint. In addition, cone motion is more controlled in a sealed box, reducing the chance of
mechanical damage to the woofer.
Stillwater Designs has been using sealed enclosures in its show vehicles for a number of years.
They have proven to be very reliable, with highly predictable performance, even under extreme
power demands. The sealed enclosure sound is very tight and controlled, yet very “full” and solid,
with extended low bass response.
Note that a large box improves low bass performance and a small box produces more mid-bass“bump”. A vented box also produces lots of “bump” because of the output from the vent. Some
prefer this “boosted bass” sound, while others favor accuracy of the sealed enclosure. Consider
the type of “sound” you want, and choose your enclosure to produce it.
SEALED ENCLOSURE
Competition™ Series Drivers
Box Volume
Model Cubic Feet

F3-3 dB

C18c

3537
39
31.5
33.5
35
37
38
41
48
49
50
57
58
59
78
79
80

C15c
C12c
C10c
C8c
C6.5c

4.44 (+20%) Maximum
3.70 Recommended
2.96 (-20%) Minimum
3.60 (+20%) Maximum
3.00 Recommended2.40 (-20%) Minimum
2.10 (+20%) Maximum
1.75 Recommended
1.40 (-20%) Minimum
1.50 (+20%) Maximum
1.25 Recommended
1.00 (-20%) Minimum
0.78 (+20%) Maximum
0.65 Recommended
0.52 (-20%) Minimum
0.42 (+20%) Maximum
0.35 Recommended
0.28 (-20%) Minimum

VENTED ENCLOSURE
Freeair™ Series Drivers
Model
F15c
F12c
F10c
F8c
F6x9c
F6.5c

Box Volume
Cubic Feet3.60 (+20%) Maximum
3.00 Recommended
2.40 (-20%) Minimum
2.10 (+20%) Maximum
1.75 Recommended
1.40 (-20%) Minimum
1.50 (+20%) Maximum
1.25 Recommended
1.00 (-20%) Minimum
0.78 (+20%) Maximum
0.65 Recommended
0.52 (-20%) Minimum
0.78 (+20%) Maximum
0.65 Recommended
0.52 (-20%) Minimum
0.42 (+20%) Maximum
0.35 Recommended
0.28 (-20%) Minimum

Vent Diameter Vent Length(qty) inches
inches(1)
0r (2)
”
(1)
””
(1)
””
(1)
””
(1)
”
”
(1)
”
”

4 4.25
3 6” ”
3 4.75” ”” ”
3 5.25” ”” ”
2 5.00” ”” ”
2 5.00” ”” ”
1.5 4.25
” ”
” ”

Fb
F3
Hz -3 dB
323539323541364045364045364045404550

3437
41
35
37.5
4434.53840.54143.5474143.54740
4449

THIELE-SMALL PARAMETERS
T/S parameters are used to design sealed, vented and other types of speaker enclosures.
The information is provided for users who have computer speaker CAD programs or wish to
calculate box parameters long hand.
Random samples of each model were selected for parameter testing from shipping stock.
Each driver was broken in by driving it at its resonant frequency to an excursion of Xmax for aperiod of two hours before testing. This break-in settled the driver’s parameters which shiftslightly during the first few hours of use. Multiple test were taken of each driver and averaged
for accuracy.
Test equipment used included an Audio Precision test instrument driven by a PC computer.
Additional data was calculated or verified by LEAP (Loudspeaker Enclosure Analysis Program) on
a PC computer.
Because parameters shift during break-in, optimum low bass performance should be expected after approximately four to five hours of normal use.

Competition™ Series Drivers
MODEL

C15c

C12c

C10c

C8c

C6.5c

SPL 1W/1M
91.8dB
90.57dB
Displacement, cc
4720.28
2677.31
Displacement, Culn
288.05163.38Hole Cutout, in. dia.
16-1/2"
14"
Mounting Depth, in.
7-1/2"
6"
Revc
3.23Ω
3.59Ω
Sd, SqM
0.12010.0830
BL
13.32
10.26
Vas, Liters
707.32556.54
Vas, CuFt.
24.82
19.53
Mms, gms
215.18118.17
Fs
18.5
19.4
Qms
6.719
6.551
Qes
0.454
0.492
Qts
0.425
0.457
Pmax, watts
1000
500
Xmax,mm11.12
7.68
Freq. Response (Hz)20-20020-200Magnet Weight (Oz.)
11060
Voice Coil (Kapton)
3"
2"
Preliminary - Based on 4Ω model measurements

C18c

89.56dB
1523.66
92.98
11-1/8"5"3.59Ω
0.0531
9.61
444.43
15.59
81.78
16.7
6.985
0.334
0.318
400
7.68
20-200382"

89.75dB
945.0457.67
9-1/8"
4-3/8"
3.59Ω
0.03409.32
177.76
6.24
50.40
21.5
8.107
0.282
0.272
300
7.68
25-20032
2"88.57dB
408.0424.9
7-1/8"
3-3/8"
3.48Ω
0.0214
6.68
70.84
2.49
26.97
29.3
7.497
0.387
0.368
200
4.80
30-600201.5""

87.31dB
366.41
22.36
5-5/8"2-7/8"
3.48Ω
0.0133
7.79
19.23
0.67
23.20
37.7
3.881
0.315
0.291
150
4.80
30-60020
1.5"Freeair™ Series Drivers
MODEL

F12c

F10c

F8c

F6x9c

F6.5c

SPL 1W/1M
90.39dB
88.7dB
Displacement, cc
2677.311523.66
Displacement, Culn
163.3892.98
Hole Cutout, in. dia.
14"11-1/8"
Mounting Depth, in.
6"
5"
Revc
3.59Ω
3.59Ω
Sd, SqM
0.08300.0531
BL
10.38
9.61
Vas, Liters
246.93146.89Vas, CuFt.
8.66
5.15
Mms, gms
122.59
90.99
Fs
28.6
27.6
Qms
8.0368.650
Qes
0.734
0.613
Qts
0.673
0.572
Pmax, watts (Vented)
500
400
Pmax, watts (Freeair)
300
250
Xmax,mm7.68
7.68
Freq. Response (Hz)20-20020-200Magnet Weight (Oz.)
6038
Voice Coil (Kapton)
2"2"Preliminary - Based on 4Ω model measurements

F15c

89.74dB
945.0457.67
9-1/8"
4-3/8"
3.59Ω
0.0340
8.69
81.95
2.88
45.46
32.4
5.395
0.440
0.407
300
200
7.68
25-20032
2"88.25dB
408.0424.9
7-1/8"
3-3/8"
3.48Ω
0.0214
7.08
19.28
0.68
29.86
53.5
6.1450.696
0.625
200
150
4.80
30-600201.5"

87.28dB
383.46
23.4
Oval
3-5/8"
3.48Ω
0.0204
7.56
22.91
0.80
26.98
49.2
4.366
0.508
0.455
200
150
4.80
30-600201.5”

89.96dB
366.41
22.36
5-5/8"
2-7/8"
3.48Ω
0.0133
7.43
14.73
0.52
23.02
43.2
6.121
0.395
0.371
150
100
4.80
30-600201.5"

If you have more questions about the installation of your new KICKER component, see theAuthorized KICKER Dealer where you purchased your component. You may also call our TechnicalServices Line at 405 624-8583 for technical assistanceSPEAKER SYSTEMS LIMITED WARRANTYStillwater Designs warrants this product to be free from defects in material and workmanship undernormal use for a period of one (1) year from date of original purchase, unless this product is labeled “BStock”, in which case it is warranted for ninety (90) days from date of purchase. Should service be necessary under this warranty for any reason due to manufacturing defect or malfunction during the warranty
period, Stillwater Designs will replace or repair (at its discretion) the defective merchandise with equivalent merchandise at no charge. Warranty replacements on “B-Stock” may have cosmetic scratches andblemishes. Discontinued products may be replaced with equivalent products.
This warranty is valid only for the original purchaser and is not extended to owners of the product subsequent to the original purchaser. Any applicable implied warranties are limited in duration to a periodof the express warranty as provided herein beginning with the date of the original purchase at retail,and no warranties, whether express or implied, shall apply to this product thereafter. Some states do notallow limitations on implied warranties, therefore these exclusions may not apply to you.
This warranty gives you specific legal rights; however you may have other rights that vary from state tostate.

WHAT TO DO IF YOU NEED WARRANTY OR SERVICE

Defective merchandise must be returned to your local Authorized Stillwater Designs (Kicker/Impulse)
Dealer for warranty. Assistance in locating an Authorized Dealer can be obtained by writing or calling
Stillwater Designs direct. You can confirm that a dealer is authorized by asking to see a current authorized dealer window decal.
If it becomes necessary for you to return defective merchandise, call the Kicker Customer ServiceDepartment at (405)624-8510 for a Return Authorization (RA) number. Package all defective items in theoriginal container or in a package that will prevent shipping damage, and return toStillwater Designs, 5021 North Perkins Road, Stillwater, OK 74075
The RA number must be clearly marked on the outside of the package. Return only defective components. Return of entire cabinets, system packs, pairs, etc. increases your return freight charges. Nondefective items received will be returned freight collect.
Include a dated proof-of-purchase from an Authorized Dealer. Warranty expiration on items returned
without proof-of-purchase will be determined from the manufacturing date code. Coverage may beinvalidated if this date is greater than one (1) year previous to the date item is sent in. Freight must beprepaid; items received freight collect will be refused.
Failure to follow these steps may void your warranty. Any questions can be directed to the Kicker
Customer Service Department at (405)624-8510.

WHAT IS NOT COVERED?
This warranty is valid only if the product is used for the purpose for which it was designed.
It does not cover:• Install slips (screwdriver holes)• Damage caused by exposure to water
and/or excessive heat.
• Damage through negligence, misuse, oraccident.
• Items physically damaged due to abuse.
• Freight damage.
• The cost of shipping product to Stillwater
Designs Service.

• Items previously repaired by any
unauthorized repair facility.
• Items returned from unauthorizedindividuals or dealers.
• Return shipping on non-defective items.
• Speakers damaged due to amplifierclipping or distortion.
• Speakers with silicon caulk used for gasket
material.

HOW LONG WILL IT TAKE?
Stillwater Designs maintains a goal of 24-hour service for all returns. Delays may be incurred iflack of replacement inventory or parts is encountered.

INTERNATIONAL WARRANTY
Contact your International Stillwater Designs dealer or distributor concerning specificprocedures for your country’s warranty policies.
P.O. Box 459 • Stillwater, Oklahoma 74076 • U.S.A. • 405 624-8510

WARNING:

KICKER drivers are capable of producing sound levels that can permanently
damage your hearing! Turning up a system to a level that has audible distortion ismore damaging to your ears than listening to an undistorted system at the same
volume level. The threshold of pain is always an indicator that the sound level is
too loud and may permanently damage your hearing.
Please use common sense when controlling volume!
MARCH 2000