Proline X PO 10TW-S W MPS sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

Performance Optimized Wedge Wide Sealed Triple 10" Enclosure Hertz Mille Pro MPS 250 · Triple 10" Sealed enclosure

Net volume: 0.528 cu ft per driver, 1.58 cu ft total, after both dividers and an estimated 0.039 cu ft displacement per driver
Max mounting depth: 3.25 in required; 1.58 in clearance above the motor against the raked rear panel
External dimensions: 40 in W × 17 in at the seat face H × 11.32 in at the base D
Front baffle: 1.5 in double baffle, outer layer machined as a flush recess

Buy at Audio IntensityFactory-direct, ships from Tullahoma

Hertz Mille Pro MPS 250Buy at Audio Intensity

Best For: Triple Hertz Mille Pro MPS 250 SUV Cargo-Floor Builds
Net Volume: 0.528 cu ft per Driver (1.58 cu ft Net Total)
Driver Match: Three Hertz Mille Pro MPS 250 (Single 2 Ohm / Single 4 Ohm), matched
Construction: 3 Chambers | 40" Wide Wedge | V-Groove/Dado | Double 1.5" Baffle | 3 Terminal Cups

Spec of record

Technical specifications

Specification	Value
Series	Proline X Performance Optimized Wedge Wide
Compatible Driver	Hertz Mille Pro MPS 250, quantity 3, matched. Direct fit
Configuration	Triple 10 inch sealed wedge, 3 chambers, 1 driver per chamber
Mounting Position	SUV cargo floor, raked face against the rear seat back
Firing Direction	Rearward toward the liftgate. Not a down fire design
External Width	40 in
External Height	17 in at the seat face
External Depth	11.32 in at the base, tapering to 5.14 in at the top
Internal Volume, Gross	1.76 cu ft total
Internal Volume, Net Acoustic	0.528 cu ft per driver, 1.58 cu ft total, after both dividers and an estimated 0.039 cu ft displacement per driver
Driver Mounting Depth	3.25 in required; 1.58 in clearance above the motor against the raked rear panel
Alignment Per Driver	MPS 250 10" S2 Qtc 0.666, fc 45.5 Hz, F3 48.5 Hz; MPS 250 10" S4 Qtc 0.748, fc 45.2 Hz, F3 42.9 Hz anechoic
Woofer Openings	3 at 9.118 in
Woofer Layout	One row across the face
Frame Outer Diameter	10.807 in
Fs / Qts / Qes / Qms	28.0 Hz / 0.410 / 0.450 / 5.300
Vas / Sd / Xmax	24.5 L / 364 cm2 / 17 mm
Driver Power Handling	500 W RMS per driver, 1500 W RMS for the set of 3 (thermal rating)
Recommended Amplifier	350-500 W RMS per driver, 1,050-1,500 W RMS for the full set
Parameter Source	Hertz published specifications
Material	Langboard Elite MDF
Construction	CNC cut, V-groove and dado joinery
Panel Thickness	0.75 in
Front Baffle	1.5 in double baffle, outer layer machined as a flush recess
Internal Bracing	Two full-height 3/4 in dividers
Driver Mounting	Threaded inserts, stainless machine screws included
Terminal Cups	Three Proline X ABS and carbon fiber composite, on the rear panel, one per chamber, pre wired 12 gauge OFC
Acrylic Insert	Gloss black acrylic baffle insert standard
Damping	Light polyfill wall lining in every chamber, does not alter acoustic volume
Carpet	Plush black
Shipping Weight	63 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace

0.528

cu ft per driver

System Qtc

0.67–0.75

sealed

Half power

42.8–48.5

Hz · F3

Xmax at

654

W RMS per driver · no filter

With 25 Hz subsonic

912

W RMS per driver · +39%

Amplifier, per driver

350–500

W RMS recommended

This enclosure holds 0.528 cu ft net per driver. In it the Hertz MPS 250 10" S2 runs a system Qtc of 0.67–0.75 with half power at 42.8–48.5 Hz, and the cone reaches its 16.8 mm travel limit at 654 W per driver, above the driver’s 500 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 912 W per driver — +258 W, or 39 percent more power for the same 16.8 mm of travel.

00Sizing the amplifier

Every wattage on this panel is per driver. This cabinet holds three, so the amplifier feeds all three at once.

Per driver 350–500 W RMS × 3 drivers = full set 1,050–1,500 W RMS

Look for a mono amplifier rated 1,050–1,500 W RMS at the load your coil version wires to. The top is the driver’s 500 W thermal rating; with the 25 Hz subsonic set the cone still has travel to spare there, reaching Xmax only at 912 W. Below the bottom of the range it will play, just with less headroom; above the top you are buying power the drivers cannot use.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 55.8–62.2

Single 2 Ohm · EBP 62.2Single 4 Ohm · EBP 55.8

At 55.8–62.2 the MPS 250 10" S2 sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

0.528 cu ft against a 24.5 L Vas.

α = Vas ÷ Vb = 1.64 · Fc = Fs√(α+1) = 45 Hz · Qtc = 0.67–0.75

Single 2 Ohm · Qtc 0.67, Fc 45 Hz, F3 48.5 HzSingle 4 Ohm · Qtc 0.75, Fc 45 Hz, F3 42.8 Hz

The box lifts resonance from 28.0–29.0 Hz free-air to 45 Hz and half power lands at 42.8–48.5 Hz, anechoic, before any cabin gain. Figures are Hertz’s published parameters; Qes and Qms reproduce the printed Qts. This cabinet holds three drivers in three separate sealed chambers of 0.528 cubic feet each, the volume plotted here.

03The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 16.8 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 654–698 W per driver unfiltered → 912–940 W with a 25 Hz subsonic

Single 2 Ohm · 654 W, no filterSingle 4 Ohm · 698 W, no filterSingle 2 Ohm · 940 W with subsonic at 25 Hz, 24 dB/octSingle 4 Ohm · 912 W with subsonic at 25 Hz, 24 dB/octXmax 16.8 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 16.8 mm. Unfiltered that is 654 W per driver, reached first at 20 Hz. It sits above the 500 W the driver can take thermally, so the voice coil gives up before the suspension does. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 912 W per driver before hitting the same 16.8 mm. That is 39 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	28.00 / 29.00	Hz	free-air resonance
Qts	0.410 / 0.480		Single 2 Ohm / Single 4 Ohm
Vas	24.50 / 21.20	L	equivalent compliance
Sd	364.3	cm²	effective piston area
Xmax	16.8	mm	one-way linear travel
Pe	500	W	continuous RMS
SPL	82.6	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Hertz MPS 250 10" S2 / MPS 250 10" S4 published specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Start with the size. 0.528 cubic feet per driver puts the Mille Pro MPS 250 at Qtc 0.666, resonance 45.5 Hz, half power 48.5 Hz anechoic. One box serves Single 2 Ohm and Single 4 Ohm, so the depth is the one that keeps both closest to 0.707. One box serves every coil version: the Single 2 Ohm at Qtc 0.666, the Single 4 Ohm at Qtc 0.748.

Measure the base depth, not the top. This cabinet is 11.32 in deep where it meets the floor, 5.14 at the top, 40 wide and 17 tall. In an SUV the 40 has to clear between the rear wheel wells at floor height, the base depth is measured from the seat back with the seat upright and latched, and the 17 has to clear the cargo cover.

All three terminal cups are on the rear panel, and the rear panel is the face that goes against the seat back. Wire all three before the box goes in, with enough slack to slide it into place; once the raked face is against the seat you cannot reach them.

Impedance. MPS 250 10" S2: wire for 6 ohms (the three in series), the load most monoblocks are built to deliver full power into; 0.67 ohms is the other clean option (the three in parallel). MPS 250 10" S4: wire for 12 ohms (the three in series), the load most monoblocks are built to deliver full power into; 1.33 ohms is the other clean option (the three in parallel). Work the load out before you buy the amplifier, not after.

Power. Size the amplifier for the set, not one driver: 350 to 500 W RMS per driver is 1,050 to 1,500 W RMS across all 3.

Hertz's Qes and Qms reproduce the printed Qts within 3 percent, so the alignment rests on a self-consistent set. Hertz do not publish driver displacement; we deduct an estimated 0.039 per driver, so true net can sit a few hundredths either way.

Polyfill is in as a wall lining in every chamber. Do not add more: it makes the box act larger and walks Qtc off 0.67.

Before you order

Questions

Does this fit the Hertz Mille Pro MPS 250, and its coil versions?

Yes. Each opening is cut to 9.118 in for the 10.807 in frame, and the 3.25 in deep motor clears the raked rear panel with 1.58 in to spare. Both coil versions share the frame, cutout and mounting depth; the alignment table lists each.

Run three matched drivers, same model and same coil, so every chamber sees the alignment on this page.

Why 0.528 cubic feet per driver, and what alignment does it target?

On Hertz's published Fs 28.0 Hz, Qts 0.410 and Vas 24.5 liters, 0.528 cubic feet per driver gives Qtc 0.666, system resonance 45.5 Hz and half power 48.5 Hz.

One box serves Single 2 Ohm and Single 4 Ohm, so the depth is the one that keeps both closest to 0.707.

What amplifier power should I run, and how should I wire it?

Hertz rates the Mille Pro MPS 250 at 500 watts RMS per driver. Recommended amplifier: 350 to 500 W RMS per driver, 1,050 to 1,500 W RMS for the full set of 3.

Each MPS 250 10" S2 has a single 2 ohm voice coil. The three in parallel present 0.67 ohms; in series, 6 ohms. Check the result against your amplifier's minimum stable impedance before powering up. Each MPS 250 10" S4 has a single 4 ohm voice coil. The three in parallel present 1.33 ohms; in series, 12 ohms. Check the result against your amplifier's minimum stable impedance before powering up.

Will it fit my SUV?

It is 40 inches wide, 17 tall and 11.32 deep at the base, tapering to 5.14 at the top. Measure between the rear wheel wells, the floor depth with the seat upright, and the height under your cargo cover.

The raked face goes against the seat back and the woofers fire toward the liftgate.

Why are all three terminal cups on the back?

Each driver has its own sealed chamber, and the center chamber has no side wall to take a cup. Putting all three on the rear panel gives a matching set, one cup per chamber.

Wire them at the amplifier end; there is no cross-chamber wiring inside the cabinet.

What is the expected low-frequency extension?

Anechoic F3 is 48.5 Hz per driver with system resonance at 45.5 Hz.

Those figures exclude cabin gain. An SUV cabin adds real output below about 50 Hz, so in-vehicle response runs deeper than the numbers above.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining in every chamber, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box makes it behave as though it were larger, which moves the alignment away from 0.528 cubic feet per driver.

Are the drivers included?

No. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, three pre-wired terminal cups on the rear panel, the polyfill lining in place, threaded inserts and stainless machine screws.

Bring three matched Hertz Mille Pro MPS 250 drivers. The cabinet is cut direct fit to them, not a general purpose 10 inch box.

Same series, same size