Sound Quality Ported Enclosure Explanation
The use of low tuning allows the SPG555 to deliver much stronger low bass energy when compared to the sealed
enclosure. Use of a smaller volume combined with low tuning allows the ported sound quality enclosure to produce a
relatively flat response down to 30Hz while delivering solid impact at high output levels.
Sound Quality Ported Enclosure Specifications
Recommended Enclosure Volume*:
2.1 ft
3
(59.4L)
Tuning Frequency:
33Hz
Q-Tune
™†
(Highpass and Q Setting):
31Hz @ 0.9
Sound Quality Ported Enclosure
Sound Quality Ported Enclosure Example
Gross Volume:
2.1 ft
3
(59.4L)
Internal Height (H):
14" (35.6cm)
Internal Width (W):
18" (45.7cm)
Internal Depth (D):
14" (35.6cm)
Slot Port Opening:
1
1
⁄
4
x 14” (3.2 x 35.6cm)
Port Length:
22” (55.9cm)
dB
6
0
-6
-12
-18
-24
-30
-36
5 Hz
10
50
100
500
1000
2000
In-Car Response w/ Q-Tune
™
Enclosure Response
H
D
W
PW
PL
Front View
Top View
Note: If a rectangle port cannot be used, two 3” (77mm) round ports,
16” (406mm) long may be substituted.
*All enclosure dimensions are internal and include basket and port displacement
The above enclosure shape is an example and these dimensions can be modified
provided that the exact internal volume is retained
3
⁄
4
-inch thick M.D.F. is recommended as a minimum
†
Q-Tune
™
is a feature found on Boston GT Amplifiers
7
