ENCLOSURE RECOMMENDATIONS
Optimum Sealed Volume
Internal volume: 2.95ft3/83.53L
Enclosure "Q": 1.12
-3dB response: 39Hz
Maximum power handling: 500 watts
Dimensions already include woofer displacement compensation.
Cu. feet/liters small sealed volume: 2.05/58.04
large sealed volume: 4.25/120.34
“Q”
1.29
.99
Optimum Vented Volume
Internal volume: 3.5ft3/99.1L
Tuning frequency: 28Hz
Port (D x L): 3" X 10.75"
-3dB response: 39Hz
Maximum power handling: 500 watts
Dimensions already include woofer displacement compensation, but
DO NOT include port displacement.
Cu. feet/liters small vented volume: 3/84.95
large vented volume: 4.1/116.09
Tune to
33Hz
37Hz
Optimum Bandpass Volume
Please contact Crossfire
Tech Support for bandpass enclosure recommendations
-3dB
43Hz
36Hz
18.5" 19.5"
Max Power Handling (PE)
500 watts
450 watts
19"
Port
3" X 8.5"
4” X 7.5"”
21.75"
-3dB Max Power Handling (PE)
42Hz 500 watts
36Hz 500 watts
Front Rear
Note: Dimensions for recommended enclosure are with consideration of using .75" (19mm) MDF board.
Be sure to add .109ft3/3.09L for driver displacement as well as the volume for the port to all enclosures except for the optimum recommendation as those dimensions already include woofer displacement but
DO NOT include port displacement.
Crossfire Tech Support Contact Information
Phone: (562) 906-0800
DAMPING MATERIAL
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.
SEALED ENCLOSURE
VENTED ENCLOSURE
BANDPASS (sealed chamber)
BANDPASS (vented chamber)
DACRON/POLYFILL loosely fill the enclosure line 3-5 walls line 3 walls line 1 wall (optional)
UNDERLAY
line 5 walls
line 1-3 wall
line 1-3 wall
line 1 wall (optional)
SPECIFICATIONS
FIBERGLASS line 5 walls
Please limit the use of fiberglass to sealed enclosures only
Model
Driver description
Mounting depth, in/mm
Cutout diameter, in/mm
Woofer Outer Diameter, in/mm
Woofer Displacement, ft3/ltr
Impedance
Nominal power handling (RMS)
Maximum power handling (PE)
Dynamic power handling
Voice coil – size
Magnet weight
Frequency response
Resonance frequency (fs)
Qts
Qms
Qes
VAS, ft./liter
X-max, in./mm
Efficiency (2.83V/1M)
DB315D
15” Subwoofer, Dual Voice Coil
6.5/165
13.75/350
15.375/391
.1/2.83
4 ohm per coil
300 watts
500 watts
800 watts
2”, 4 layer
56.5 oz.
20 to 400Hz
25.17Hz
.59
6.51
.64
7.52/213.05
.195/5
89dB
POWER RATINGS
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 or with consideration of the power you may already have.
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.
