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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)
Note: If a rectangle port cannot be used, two 3” (77mm)
round ports, 16” (406mm) long may be substituted.
High Output Ported Enclosure
High Output Ported Enclosure Explanation
As the name suggests, the high output ported enclosure will play the loudest of the three designs. Its
large internal volume combined with large port area delivers great efficiency for very high output. Tu n i n g
is higher than the Sound quality enclosure bringing the peak efficiency point of the enclosure much
closer to average vehicle resonance but is still tuned low enough for good musical reproduction.
High Output Ported Enclosure Specifications
Recommended Enclosure Volume*: 2.5 ft
3
(70.8L)
Tuning Frequency: 38Hz
Q-Tune
™†
: (Highpass and Q Setting) 36Hz @ 1.2
High Output Ported Enclosure Example
Gross Volume: 2.5 ft
3
(70.8L)
Internal Height (H): 14" (35.6cm)
Internal Width (W): 22" (55.9cm)
Internal Depth (D): 14" (36.8cm)
Slot Port Opening (PW): 1
3
⁄
4
x 14” (4.5 x 35.5cm)
Port Length (PL): 19” (48.3cm)
Note: If a rectangle port cannot be used, two 3” (77mm)
round ports, 10” (254mm) long may be substituted.