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7.5 cu.ft. Subwoofer Cabinet Design with Eminence 18” Woofers Eminence released the Kilomax Pro-‐18A in 1999. It was one of the first woofers in the industry to break the 1000 watt threshold, utilizing unique features, like core periphery ventilation and the signature, front mounted heat sink with the Eminence logo. In 2008, Eminence made some design enhancements, which improved the parameters and longevity of the Kilomax Pro-‐18A. It’s been a very successful and popular model and we want to take this opportunity to share a proven design we have used with one of our most renowned offerings. Below are the detailed plans for a 7.5 cubic foot enclosure, tuned to 38Hz for the Kilomax Pro-‐18A. We have provided drawings in PDF and DFX formats. We have also included this chart showing how other Eminence 18”woofers will perform in this cabinet if a different model is more suitable for your needs. Definimax 4018LF Driver’s Nominal Imp (Ω)
Delta Pro-‐18A
Delta Pro-‐18C
Impero 18A
Impero 18C
Kilomax Pro-‐18A
Omega Pro-‐18A
Omega Pro-‐18C
Sigma Pro-‐18A
Sigma Pro 18C
Kappa Pro 18A
8
8
4
8
4
8
8
4
8
4
8
Box Tuning Freq,Fb(Hz)
38
38
38
38
38
38
38
38
38
38
38
-‐3dB Down Freq,F3(Hz)
35
42
41
39
39
38
39
38
41
44
44
High Pass Freq. (Hz)
30
35
35
30
30
30
35
35
35
35
30
Low Pass Freq. (Hz)
100
100
100
125
125
125
125
125
125
125
125
1200
500
500
1200
1200
1250
800
800
650
700
800
System Power Handling (Watts)
950
350
500
500
700
700
180
180
350
500
550
SPL @ 50Hz @ Rated System Power
125
123
122
124
125
126
120
120
122
123
125
SPL @ 90Hz @ Rated System Power
127
125
125
125
126
127
121
121
123
124
127
Driver’s EIA-‐426A PowerRating (Watts)
Rec. Amp Power Rating
1500-‐1800 @ 8 Ω
500-‐700 @ 8 Ω
700-‐1000 @ 4 Ω
700-‐1000 @ 8 Ω
1000-‐1400 @ 4 Ω
1200-‐1400 @ 8 Ω
300-‐400 @ 8 Ω
300-‐400 @ 4 Ω
500-‐700 @ 8 Ω
600-‐1000 @ 4 Ω
700-‐1200 @ 8 Ω