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ENCLOSURE CONSTRUCTION:
The low frequency enclosure shape is not critical. The enclosure panels need
to be rigid and air tight at all seams. Cross bracing is recommended, as is using 3/4” material. Preferably
Medium Density Fiberboard (MDF). Screws or an air stapler are excellent construction fasteners when used with
a strong bonding “yellow” wood working glue that can fill joint gaps. Lining the walls with Polyester batting
(recommended) or bonded fiberglass 1-3” thick is sufficient. Box “stuffing” is only suitable for sealed enclosures.
WOOFER SPECIFICATIONS
ENCLOSURE RECOMMENDATIONTHIEL/SMALL PARAMETERS
Due to ongoing research and developments, all specifications effective 4/01 are subject to change without notice.
USING THE ENCLOSURE RECOMMENDATION CHART:
Your PG dealer has extensive technical knowledge, tools
and experience needed for the design and construction necessary for your QX application. We also recommend that
you consult with your dealer for technical assistance relevant to your installation details.
The charts provided should be used as a reference when building an enclosure for your QX speakers. Depending on
the application desired, either Musical (Sound Quality) or SPL, the charts shown contain three different types of
enclosure designs: sealed, vented, and bandpass. Each enclosure type provides particular perf o rmance features. For
Musical needs, the bass produced will be both accurate and deep. SPL is exactly that. Higher output, but less
extended bass in the lower frequencies. Sealed boxes are less complicated to construct and provide excellent low
frequency response in small enclosures. Vented enclosures can be manipulated to exhibit a more extended LF
output, or peaked SPL output, at the expense of a larger enclosure and slightly more complex design effort. The
Bandpass enclosures are capable of very high SPL with limited bandwidth and are definitely more intensive to design.
The parameters given are based on drivers that are broken in. That is, a new driver will not perf o rm to it’s
maximum potential in a given enclosure until it is sufficiently worked to loosen up the suspension components
and thermally set the voice coil assembly. The enclosure recommendations are based on PG’s extensive
knowledge and experience with the QX line and represent the “best fit” transfer functions for the application. PG
includes the T/S parameters for your experimentation. You must remember that the majority of computer
modeling programs base the given transfer function on a half space prediction. The measured in vehicle SPL
response will substantially deviate from this with an increased output with the lowering of frequency (20-80Hz).
If your modeling program allows, determine the excursion capability of the woofer in the chosen enclosure for the
power applied. A compromise must be made as to low frequency (F3) and excursion limits. Remember too, that
the ports necessary can become unwieldy in size and in number relative to the enclosure size.
*Enclosure volumes do not account for speakers, braces or port s
QX104 QX108 QX124 QX128
R
evc
(DC VC re/parrallel) 3.96Ω 6.78Ω 4.02Ω 6.78Ω
L
evc
(inductance@1Khz) 1.15mH 1.66mH 1.31mH 1.78mH
F
o
(Res Freq) 29.95Hz 32.88Hz 28.50Hz 29.000Hz
S
d
(Piston Area) 0.033m
2
0.033m
2
0.049m
2
0.049m
2
BL (Flux Length) 9.69TM 12.11TM 9.88TM 13.27TM
SPL
O
(SPL @ 1W) 88dB 887dB 87dB 88dB
Q
ms
(Mech Q) 5.726.27 6.30 6.01
Q
es
(Elec Q) 0.500.60 0.73 0.69
Q
ts
(Total Q) 0.460.54 0.65 0.62
V
as
(Acous Vol) 70.15L 58.61L 106.87L 103.68L
C
ms
(Compliance) 450µM/N376µM/N 316µM/N 306µM/N
M
ms
(Total Mass) 62.80g 62.36g 98.75g 98.31g
P
e
(Therm Power Handling) 150W 200W 250W 250W
X
max
(P-P Lin. Excursion) 12.1mm 11.6mm 11.6mm 13.6mm
V
c
(Voice Coil Diameter) 1.5in 2.0in 2.0in 2.5in
V
dd
(Driver Displacement) 117in
3
117in
3
192in
3
192in
3
Mounting Diameter 9 1/8in 9 1/8in 11 in 11in
Mounting Depth 4 3/4in 4 3/4in 5 3/8in 5 3/8in
SEALED VENTED BANDPASS
Vb* Vb* Fb Vd Vl Vsealed* Vvented* Fb Vd Vl
QX104
MUSICAL 1.50 2.25 35Hz 3”ABS 3.75” 2.00 1.00 45 3”ABS 6.75”
SPL 0.60 1.75 45Hz 3”ABS 2.25” 1.00 1.00 53 3”ABS 4.25”
QX108
MUSICAL 1.50 2.25 35Hz 3”ABS 3.75” 2.00 1.00 45 3”ABS 6.75”
SPL 0.60 1.75 45Hz 3”ABS 2.25” 1.00 1.00 53 3”ABS 4.25”
QX124
MUSICAL 2.00 2.5 35Hz 4”ABS 6.50” 3.00 1.75 40 4”ABS 8.50”
SPL 1.00 1.50 45Hz 4”ABS 6.75” 1.75 2.00 47 4”ABS 4.25”
QX128
MUSICAL 2.00 2.5 35Hz 4”ABS 6.50” 3.00 1.75 40 4”ABS 8.50”
SPL 1.00 1.5 45Hz 4”ABS 6.75” 1.75 2.00 47 4”ABS 4.25”