HERTZ MPS250S4 Car Audio Systems Owner’s Manual
- June 4, 2024
- HERTZ
Table of Contents
HERTZ MPS250S4 Car Audio Systems Owner’s Manual
ENCLOSURE DESIGN MP/MPS
In the following pages the Hertz Tech Team developed Sealed and Reflex designs
for MP and MPS subwoofers. They are ready-to-build solutions, including the
panel cut list, considering wood thickness 19mm (0.75in.) for MP and 16mm
(0.63in.) for MPS series.
The Vb data is the net volume for the enclosure, i.e. it excludes the speaker
volume, ports, any internal bracing and any other internal component.
The declared Fb is the actual tuning frequency of the box realized according
to the ready-to-build solution. This geometry can not be accurately modeled
using lumped parameter-based design software, hence those software may produce
different results.
REGULAR
SHALLOW
Regular and Shallow variants for MPS series provide the same performance
in just a different shape. Regular has the widest application while Shallow is
the “solution” where low-depth is a matter.
Sealed enclosure designs provide optimally damped response for tight and
accurate bass reproduction offering high energy in the range 20Hz-40Hz.
Where a high SPL bass is desired, and space is not a problem, the Reflex
designs are the best choice concentrating most of energy in the 40Hz-80Hz
range.
ENCLOSURE DESIGN MP 250 D2 / D4
BOX
TECH DATA
| | Vb| Fc / Fb| Qtc| External dimensions
(Pic .1)
| Mounting
Hole – M
| Wood
Thickness
| PxS-Port inner size| Lp- Port
lenght
| Damping
Material
---|---|---|---|---|---|---|---|---|---|---
W| H| D| P| S
l
(cu. ft.)
| Hz| mm (in.)| mm (in.)| mm (in.)| mm
(in.)| mm (in.)| mm (in.)| mm (in.)| mm
(in.)
MP 250 D2. 3
Sealed (Fc)
| | 17
(0.60)
| 50| 0,85| 450
(17.72)
| 350
(13.78)
| 190
(7.48)
| 236
(9.29)
| 19
(0.75)
| –
–
| –
–
| –
–
| Pic. 1
MP 250 D4. 3
Sealed (Fc)
| | 17
(0.60)
| 47| 0,82| 450
(17.72)
| 350
(13.78)
| 190
(7.48)
| 236
(9.29)
| 19
(0.75)
| –
–
| –
–
| –
–
| Pic. 1
MP 250 D2/D4. 3
Reflex (Fb)
| | 24,5
(0.96)
| 38| –| 568
(22.36)
| 330
(12.99)
| 276
(10.87)
| 236
(9.29)
| 19
(0.75)
| 292
(11.50)
| 50
(1.97)
| 670
(26.38)
| Pic. 2
SEALED BOX ASSEMBLY
DAMPING MATERIAL BOX ASSEMBLY AND SHAPE
This manual features the box assemblies and shapes which are easiest to
create.
However, the bass frequency performance can be noticeably improved with
different box shapes, assembly methods and construction materials.
PANELS
CUT LIST
| | A| Qty| B| Qty| C| Qty
---|---|---|---|---|---|---|---
mm (in.)| Pcs| mm (in.)| Pcs| mm (in.)|
Pcs
MP 250 D2/D4. 3
Sealed
| | 450 X 350
(17.72 x 13.78)
| 2| 450 x 152
(17.72 x 5.98)
| 2| 312 x152
(12.28 x 5.98)
| 2
MP 250 D2/D4. 3
Reflex
| | 568 x 330
(22.36 x 12.99)
| 2| 568 x 238
(22.36 x 9.37)
| 2| 292 x 238
(11.50 x 9.37)
| 2
PANELS
CUT LIST
| | A| Qty| B| Qty| C| Qty
---|---|---|---|---|---|---|---
mm (in.)| Pcs| mm (in.)| Pcs| mm (in.)|
Pcs
MP 300 D2/D4. 3
Sealed
| | 450 X 360
(17.72 x 14.17)
| 2| 450 x 242
(17.72 x 9.53)
| 2| 322 x242
(12.68 x 9.53)
| 2
MP 300 D2/D4. 3
Reflex
| | 620 x 390
(24.41 x 15.35)
| 2| 620 x 292
(24.41 x 11.50)
| 2| 352 x 292
(13.86 x 11.50)
|
DAMPING MATERIAL BOX ASSEMBLY AND SHAPE
This manual features the box assemblies and shapes which are easiest to
create.
However, the bass frequency performance can be noticeably improved with
different box shapes, assembly methods and construction materials.
SUGGESTED PORT POSITION/DIMENSION
ROUND SHAPE SUGGESTED AT THESE POINTS
FILTER| | Suggested Subsonic filter cut-off| Suggested Lo-pass
filter cut-off
---|---|---|---
MPS 250 S2/S4
Sealed
| | 15 Hz / 24dB Oct| 70-80 Hz / 24 db Oct
MPS 250 S2/S4
Reflex
| | 20 Hz / 24dB Oct| 60-70 Hz / 24 db Oct
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>