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18 inch Subwoofer Boxes

Subwoofer Box Sundown Audio U18

Ported Box for 18 inch Subwoofer | Slot (Front Panel)
Net Internal Volume: 5.8 ft3. Port Area: 60.5 in2. Tuning Frequency: 32 Hz.

Subwoofer Box SPL SI HT- 18 v3 HomeSub

Ported Box for 18 inch Subwoofer | Slot (Front Panel)
Net Internal Volume: 8.3 ft3. Port Area: 75.8 in2. Tuning Frequency: 22 Hz.

Subwoofer Box Sundown Audio u18

Ported Box for 18 inch Subwoofer | Slot (Front Panel)
Net Internal Volume: 6.4 ft3. Port Area: 93.0 in2. Tuning Frequency: 32 Hz.

Subwoofer Box full 18 megapower

Ported Box for 18 inch Subwoofer | Slot (Front Panel)
Net Internal Volume: 6 ft3. Port Area: 30 in2. Tuning Frequency: 30 Hz.

Subwoofer Box sub 18 megapower side

Ported Box for 18 inch Subwoofer | Slot (Right Panel)
Net Internal Volume: 5 ft3. Port Area: 30 in2. Tuning Frequency: 30 Hz.

Subwoofer Box SPL sub 18 megapower

Ported Box for 18 inch Subwoofer | Slot (Front Panel)
Net Internal Volume: 5 ft3. Port Area: 60 in2. Tuning Frequency: 40 Hz.

Subwoofer Box Skar Audio Basket Up Port Side

Ported Box for 18 inch Subwoofer | Slot (Right Panel)
Net Internal Volume: 5.3 ft3. Port Area: 80 in2. Tuning Frequency: 32 Hz.

Subwoofer Box Skar Audio Dual 4 Inch Ports

Ported Box for 18 inch Subwoofer | Pipe (Front Panel)
Net Internal Volume: 6 ft3. Tuning Frequency: 32 Hz.

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