German Maestro 3 SUB 12 subwoofer 12" (300 mm).

German Maestro 3 SUB 12 subvūfers 12" (300 mm).

Enclosure Recommendations 
(Data valid for an activated low-pass filter at 80Hz, 24dB/oct) 
The choice of enclosure has a significant influence on the tonal behavior and maximum SPL of the subwoofer. In general, we recommend two different types of enclosure: 
Option 1 – Closed box 
(precise, crisp bass for sound quality installations) 
50 litres: Qtc = 0,55 ; fu (-10 dB) = 20 Hz (recommendation for maximum depth) 
24 litres: Qtc = 0,7 ; fu (-10 dB) = 24 Hz (best compromise of enclosure size and depth) 
15 litres: Qtc = 0,85 ; fu (-10 dB) = 28 Hz (recommendation for small enclosure) 
Option 2 – Vented Box 
(up to 8dB more maximum SPL than comparable closed boxes, but less precise) 
50 liters: fb = 26 Hz (1x BR-Kit-1) ; 
fu (-10 dB) = 20 Hz (recommended for maximum SPL all the way down) 
30 liters: fb = 34 Hz (1x BR-Kit-1) ; 
fu (-10 dB) = 26 Hz (recommended for smaller enclosures)