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Proline X PO 10-S DFW SC sealed down-fire wide enclosure for the Morel Ultimo Ti SC102 / SC104, 41 inches wide by 7.1875 inches tall, feet add 1.75 inches of height.
Proline X PO 10-S DFW SC sealed down-fire wide enclosure, end panel with side-mounted terminal cup, 7.1875 inches tall by 12 inches deep.

Performance Optimized · Datasheet

Performance Optimized Down Fire Wide Sealed 10" Enclosure Morel Ultimo Ti SC102 / SC104 · Single 10" Sealed enclosure

Net volume
1.067 cu ft after displacement
Max mounting depth
5.63 in
External dimensions
41 in W × 7.1875 in in the down fire position H × 12 in D
Front baffle
1.5 in double baffle, outer layer machined as a flush recess
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Morel Ultimo Ti SC102 / SC104Buy at Audio Intensity
  • Alignment: 1.067 cu ft net. SC102 Qtc 0.587, Fc 51.0 Hz, F3 63.4 Hz; SC104 Qtc 0.570, Fc 47.2 Hz, F3 61.1 Hz; height set by motor clearance
  • Down Fire Wide: 41"W x 12"D x 7.1875"H in down fire position, 3" shallower and 11" longer than the standard 30 x 15, for under rear seats and narrow cargo floors
  • Driver: SC102 (2 ohm) or SC104 (4 ohm), 600 W RMS, 9.5 mm Xmax, 5.63 in mounting depth
  • Build: Windowed U-brace, 1.5" double baffle, one side-mounted terminal cup, 12g OFC
  • Standoffs: 1.75", ship uninstalled. Installed height 8.9375"

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Down Fire Wide
Compatible DriverMorel Ultimo Titanium SC, SC102 or SC104, quantity 1. Direct fit
Enclosure TypeSealed, single driver, down fire, floor coupled
Intended FitmentUnder the rear seat of trucks and SUVs and narrow cargo floors, where depth is the limiting dimension
Firing DirectionDown firing, driver fires toward the floor. Standoffs ship uninstalled, so front or up firing is also possible
Chamber ConfigurationSingle sealed chamber, windowed U-brace, one side-mounted terminal cup
External Width41 in
External Depth12 in
External Height7.1875 in in the down fire position, excludes standoffs
Installed Height8.9375 in with the 1.75 in standoffs
Standard 30 x 15 Equivalent30 x 15 x 7.13 in, 0.96 cu ft net. Same driver, deeper and shorter footprint
Internal Volume, Gross1.155 cu ft
Net Volume1.067 cu ft after displacement
Height Set ByDriver clearance: the 5.63 in motor, 0.75 in minimum above it
Clearance Above Motor0.81 in
Alignment, SC102Qtc 0.587, Fc 51.0 Hz, F3 63.4 Hz anechoic
Alignment, SC104Qtc 0.570, Fc 47.2 Hz, F3 61.1 Hz anechoic
Woofer Opening8.87 in (225.15 mm) direct fit
Frame Outer Diameter10.35 in (263 mm), Morel spec
Bolt Circle9.96 in (253 mm), Morel drawing; inserts pressed to it
Driver Mounting Depth5.63 in
Morel Published Sealed Range13 to 30 liters, including driver displacement
SC102 Fs / Qts / Qes / Qms33.00 Hz / 0.38 / 0.48 / 1.75
SC102 Vas / Mms / BL42.00 L / 91.6 g / 7.06 T-m
SC104 Fs / Qts / Qes / Qms29.00 Hz / 0.35 / 0.43 / 1.84
SC104 Vas / Mms / BL50.00 L / 101.7 g / 11.00 T-m
Driver Sd346 cm2, published by Morel
Xmax9.5 mm each way; 12 mm gap
DC ResistanceSC102 1.3 ohm; SC104 3.0 ohm
Voice Coil130 mm (5.1 in) Hexatech aluminium on a titanium former
Parameter SourceMorel Ultimo Titanium SC specification sheet
Driver Power Handling600 W RMS / 2000 W transient
Wiring OptionsSingle voice coil: SC102 nominal 2 ohm, SC104 nominal 4 ohm
Driver Displacement0.08 cu ft, 2.3 L, published by Morel
MaterialLangboard Elite MDF
ConstructionCNC cut on ShopSabre routers, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in double baffle, outer layer machined as a flush recess
Internal BracingWindowed U-brace, dadoed to the shell
Corner ProfileSquare, Down Fire series standard
Driver Mounting8/32 threaded inserts, stainless machine screws included
Terminal CupOne Proline X ABS and carbon fiber composite, side mounted
Internal Wiring12 gauge OFC
StandoffsIncluded, 1.75 in, shipped uninstalled
DampingPolyfill pre-installed as a light wall lining
CarpetPlush Black
Bundle OptionsEnclosure only, bring your own SC102 or SC104
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
1.067
cu ft
System Qtc
0.57–0.59
sealed
Half power
61.1–63.4
Hz · F3
Xmax at
104
W RMS · no filter
With 25 Hz subsonic
165
W RMS · +58%
Amplifier
600
W RMS recommended
This enclosure holds 1.067 cu ft net . In it the Morel Ultimo Ti SC102 / SC104 runs a system Qtc of 0.57–0.59 with half power at 61.1–63.4 Hz, and the cone reaches its 9.5 mm travel limit at 104 W, below the driver’s 600 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 165 W — +61 W, or 58 percent more power for the same 9.5 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 67.4–68.8
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 SC102, 2 ohm 68.8 SC104, 4 ohm 67.4
SC102, 2 ohm · EBP 68.8SC104, 4 ohm · EBP 67.4
At 67.4–68.8 the Ti SC 10 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

1.067 cu ft against a 42.0 L Vas.

α = Vas ÷ Vb = 1.39  ·  Fc = Fs√(α+1) = 47–51 Hz  ·  Qtc = 0.57–0.59
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
SC102, 2 ohm · Qtc 0.59, Fc 51 Hz, F3 63.4 HzSC104, 4 ohm · Qtc 0.57, Fc 47 Hz, F3 61.1 Hz
The box lifts resonance from 29.0–33.0 Hz free-air to 47–51 Hz and half power lands at 61.1–63.4 Hz, anechoic, before any cabin gain. Morel measures the 2 ohm and 4 ohm coils separately and publishes a different resonance and compliance for each, so both are plotted rather than averaged; the cabinet is sized to the coil that asks for the larger box and the other coil sits a little below Butterworth in it. Figures are from Morel’s current specification sheet; Morel’s 2016 manual prints a different parameter set that does not reproduce its own moving mass and is not used 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 9.5 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 104–121 W unfiltered  →  165–179 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 9.5 mm 104 W reaches Xmax here
SC102, 2 ohm · 121 W, no filterSC104, 4 ohm · 104 W, no filterSC102, 2 ohm · 179 W with subsonic at 25 Hz, 24 dB/octSC104, 4 ohm · 165 W with subsonic at 25 Hz, 24 dB/octXmax 9.5 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 9.5 mm. Unfiltered that is 104 W, reached first at 20 Hz. It sits under the 600 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. 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 165 W before hitting the same 9.5 mm. That is 58 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs33.00 / 29.00Hzfree-air resonance
Qts0.380 / 0.350SC102, 2 ohm / SC104, 4 ohm
Vas42.00 / 50.00Lequivalent compliance
Sd346.0cm²effective piston area
Xmax9.5mmone-way, Morel prints it as plus or minus 9.5 mm each way
Pe600Wcontinuous RMS
SPL86.8dB1 W / 1 m, derived from T/S

Driver parameters as published by Morel Ultimo Titanium SC specification sheet, morelhifi.com. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Measure the installed height, not the cabinet height. The box is 7.1875 tall on its own and the standoffs add 1.75, so plan around 8.9375 inches on a 41 by 12 footprint.

The 5.63 inch motor sets this cabinet's height, not the airspace. With 0.75 inch above the magnet the wide box holds 1.067 cubic feet net, more than the 0.96 the standard 30 by 15 was built to. That drops Qtc to 0.587 on the SC102 and 0.570 on the SC104: well damped, no peak. More air is the safe direction.

Two coils, two parameter sets. We use Morel's current spec sheet, not the older manual. Single voice coil, so the load is the model you buy. 600 watts RMS.

Before you order

Questions

Why is this cabinet 41 inches wide instead of 30?

Because it is only 12 inches deep. The standard Performance Optimized Down Fire platform is 30 wide by 15 deep, and under a rear seat or on a narrow cargo floor there is often not 15 inches to give.

The airspace lost from the depth is recovered from the length, so the cabinet runs 41 inches instead of 30 and stands 7.1875 inches tall, with the same driver specific chamber. If you do have 15 inches of depth, the standard 30 by 15 cabinet is the better pick.

How does this compare to the standard 30 x 15 Ultimo Ti SC enclosure?

The standard cabinet is 30 by 15 by 7.13 inches and gives the driver 0.96 cubic feet net. This one is 41 by 12 by 7.1875 inches and gives the driver 1.067 cubic feet net. Here the height is set by the 5.63 inch motor's clearance rather than the airspace, so the wide box carries more air, which lowers Qtc slightly.

The choice is about shape: the standard box if you have 15 inches of depth, this one when depth is the limit and you have 41 inches of run.

What alignment does this cabinet produce?

In 1.067 cubic feet net the SC102 lands at Qtc 0.587 with Fc at 51.0 Hz and an anechoic F3 of 63.4 Hz, and the SC104 at Qtc 0.570 with Fc at 47.2 Hz and F3 at 61.1 Hz. Both sit below 0.707, so the rolloff is gentle with no peaking.

The airspace is larger than a flat alignment needs because the 5.63 inch motor sets the cabinet height. Cabin gain below 60 Hz extends in-car response well below the anechoic F3.

How do I wire this enclosure and set my impedance?

The SC102 and SC104 are single voice coil drivers, so the load is fixed by the model you choose: the SC102 is a nominal 2 ohm load and the SC104 a nominal 4 ohm load. The one side mounted terminal cup carries it to the amplifier. Morel rates both at 600 watts RMS; confirm your amplifier's minimum stable impedance before powering the system.

Where is the terminal cup located on a down fire enclosure?

Side mounted. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup, and on a down fire cabinet that keeps the connection accessible with the enclosure in its installed position, since the baffle faces the floor. The cup is our Proline X ABS and carbon fiber composite unit, recessed, with stainless hardware, copper ring terminals and pre-wired 12 gauge OFC.

How is this enclosure built?

V-groove and dado joinery, CNC cut on ShopSabre routers from Langboard Elite MDF, so every panel joint locks mechanically before adhesive is applied. The front baffle is a 1.5 inch double layer with the outer layer machined as a flush recess, and the driver lands on 8/32 threaded inserts with stainless machine screws. A windowed U-brace ties the long 41 inch panels together. Corners are square, the Down Fire series standard, which keeps the most internal volume for the footprint. Assembled and inspected in Tullahoma, Tennessee.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining, 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 walks the alignment away from the 1.067 cubic feet this cabinet was built to.

Is the Morel Ultimo Ti SC subwoofer included with this enclosure?

No. This listing is for the enclosure only. Bring your own Morel Ultimo Ti SC102 or SC104; the driver is purchased separately. The cutout and mounting depth are direct fit, and the 1.75 inch standoffs ship uninstalled for an installed height of 8.9375 inches.

Same series, same size

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