HERTZ MPS250S4 Car Audio Systems Owner’s Manual

June 4, 2024
HERTZ

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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

HERTZ-MPS250S4 -Car-Audio-SystemsOwner'-08

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

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