Proline X PO 10D-S DF SC sealed down fire enclosure, front panel on 1.75 inch feet, 30 by 8.8 inches.

Proline X PO 10D-S DF SC sealed down fire enclosure, end panel with recessed terminal cup, 15 by 8.8 inches.

Proline X

Performance Optimized Down Fire Sealed Dual 10" Enclosure | Morel Ultimo Ti SC102 / SC104

Q: Does this fit both the SC102 and the SC104, and will any other 10 inch fit?

Both, yes. The 2 ohm SC102 and the 4 ohm SC104 share one basket, one 8.87 inch cutout, one 10.35 inch frame and one 5.63 inch mounting depth, so the fit is identical and the inserts are pressed for both. Run two of the same model so the chambers match.Any other 10, no. The airspace is engineered around the SC102's 0.38 Qts and 42.0 liters of Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

Q: Why 0.60 cubic feet per chamber, and what alignment does it target?

It is the Butterworth volume for the SC102, computed from Morel's published Fs 33.00 Hz, Qts 0.38 and Vas 42.00 liters: system Qtc 0.707, maximally flat, with resonance at 61.4 Hz and an anechoic half-power point of 61.4 Hz. Morel's own sealed recommendation for this driver is 13 to 30 liters, 0.46 to 1.06 cubic feet, and 0.60 cubic feet sits inside it.The 4 ohm SC104 has its own parameter set, Fs 29.00 Hz, Qts 0.35 and Vas 50.00 liters, and in the same cabinet it lands at Qtc 0.694 with F3 at 58.6 Hz, a touch more damped. One cabinet serves both coils because the box is sized to the coil that asks for the larger volume.

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

Morel rates the Ultimo Titanium SC at 600 watts RMS per driver, so target 420 to 600 watts RMS per driver at the final impedance. Both coils are single voice coil drivers: the SC102 is a nominal 2 ohm load at 1.3 ohms DC, the SC104 a nominal 4 ohm load at 3.0 ohms DC.Wire both drivers identically so the chambers share power evenly. Two SC102 in parallel is a 1 ohm load and needs an amplifier rated for it; in series they present 4 ohms. Two SC104 run 2 ohms in parallel or 8 ohms in series.

Q: How tall is this once the standoffs are on?

The cabinet is 8.82 inches tall measured in the down fire position, and that figure excludes the standoffs. The standoffs hold 1.75 inches under the baffle, so plan your space around a finished stack of roughly 10.57 inches.The footprint is the standard Performance Optimized down fire platform, 30.00 inches wide by 15.00 deep. Height is the only dimension solved to the driver.

Q: Why two separate chambers instead of one shared volume?

Two drivers sharing one sealed volume load each other: each driver's compression stroke becomes the pressure the other works against, which smears transients and blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.60 cubic feet and its own polyfill.It also means a failure in one driver does not unload the other, and the alignment on this page is the alignment in each chamber, not an average across a shared box.

Q: What is the expected low-frequency extension?

Anechoic F3 is 61.4 Hz for the SC102 and 58.6 Hz for the SC104 per chamber, with system resonance at 61.4 and 57.5 Hz. At Qtc 0.71 the response is maximally flat into the rolloff, so F3 and fc coincide for the SC102.Those figures exclude cabin gain. In a car the transfer function of the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above. Morel's own sheet publishes no in-box F3 for this driver.

Q: Do I need to add polyfill or damping?

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.60 cubic feet per chamber this cabinet was built to.

Q: Is the driver included? What do I get?

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet, threaded inserts pressed to the Morel bolt pattern at both positions, stainless machine screws, one side-mounted pre-wired terminal cup, the standoffs and the polyfill lining already in place.The pair of Morel Ultimo Ti SC102 / SC104 is purchased separately. The cabinet is cut direct fit to that driver, so it is not a general purpose 10 inch box.

SKU: PO 10D-S DF SC

QUICK SPECS

Alignment: 0.60 cu ft net per chamber. SC102 Qtc 0.707, F3 61.4 Hz; SC104 Qtc 0.694, F3 58.6 Hz
Drivers: Pair of SC102 (2 ohm) or SC104 (4 ohm), 600 W RMS each, 9.5 mm Xmax, 5.63 in mounting depth
Chambers: Two fully separate sealed chambers, 3/4" MDF full divider, one shared side-mounted terminal cup
Standoffs: Included, 1.75 in, shipped uninstalled. Installed height near 10.57 in
Cabinet: 30.00"W x 15.00"D x 8.82"H in down fire position, excludes standoffs, square corners

Shipping Included No freight charges at checkout. What you see is what you pay.

Built in Tennessee CNC cut from 3/4" Langboard Elite MDF. V-groove and dado joinery.

Advanced Terminal Cup Built in-house. ABS/Carbon Fiber. Stainless steel hardware. Copper ring terminals.

$ 339.99

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Performance Optimized Down Fire Sealed Dual 10" Enclosure | Morel Ultimo Ti SC102 / SC104

$ 339.99

Enclosure Type Sealed

External Dimensions 30.00" W x 15.00" D x 8.82" H (measured in down fire position, excludes standoffs)

Gross Volume 1.41 cu ft

Net Volume 1.21 total / 0.60 per chamber cu ft

Weight 36 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

Measure the installed height, not the cabinet height. The box is 8.82 tall on its own and the standoffs add 1.75, so plan around 10.57 inches of stack on the 30 by 15 footprint.

Airspace set the height here, 0.60 cubic feet per chamber at the SC102's Butterworth volume; the 4 ohm SC104 rides along at Qtc 0.69.

Wire the pair identically. Two SC102 in parallel is 1 ohm, which most amplifiers will not take; series to 4 ohms unless the amplifier is rated for 1.

Morel's spec sheet and Morel's 2016 manual disagree on this driver. The sheet's numbers reproduce their own moving mass and land inside Morel's recommended volumes; the manual's do not, so the sheet is what this cabinet is built to. Say so if a customer brings the manual.

Polyfill is already in as a wall lining. Adding more makes the box act larger and walks the alignment off the Butterworth volume.

Product Details

Proline X Performance Optimized Down Fire Dual 10" Sealed

Cut and tuned for a pair of Morel Ultimo Ti SC102 / SC104

V-Groove and DadoLangboard Elite MDF1.21 cu ft Net TotalSeparate ChambersStandoffs Included

0.60cu ft net per chamber

0.71 / 0.69system Qtc, SC102 / SC104 per chamber

61.4 HzF3 rolloff, SC102, anechoic

8.82 incabinet height, excludes standoffs

Performance, Performance Optimized, and Micro

Proline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.

	Performance	Performance Optimized	Micro Series
Fitment	Universal. Accepts any subwoofer that clears the published cutout and mounting depth.	Woofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.	Woofer specific. Cut for one named subwoofer.
Footprint	Sized to the driver diameter.	A shared 30 by 15 inch platform, with cabinet height as the variable. This build sits on that platform at 8.82 inches tall, the height that gives each driver its own 0.60 cubic feet.	Compact per driver footprint.
Front baffle	Single, 3/4 inch.	Double, 1.5 inch, outer layer machined as a flush recess.	Double, 1.5 inch.
Driver mounting	Solid flange. You drill your own mounting holes.	Threaded inserts pressed to the Morel bolt pattern, stainless machine screws included.	Threaded inserts, stainless machine screws included.
Joinery	V-groove and dado, CNC cut.	V-groove and dado, CNC cut, full-height divider and perimeter cross brace.	Stack fab, dowel reinforced.
Published alignment	Modeled Qtc profiles across a range of drivers. No single response curve.	A real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.	Target alignment described in the listing.
Carpet	Gray standard, black optional.	Plush black.	Plush black.
Warranty	1 year limited.	1 year limited.	2 years.

Feet ship with every tier, uninstalled on purpose. Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.

This page is a Performance Optimized enclosure. The airspace, the cutouts and the cabinet height all come from the driver's own numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.

Built Around a Pair of Morel Ultimo Ti SC102 / SC104

Nothing about this cabinet is generic. Both baffles are bored to the Ultimo Titanium SC 10's 8.87 inch cutout, 225.15 mm to Morel's sheet, and the airspace lands on 0.60 cubic feet net per chamber, the Butterworth volume for the SC102.

The Ultimo Titanium SC is Morel's 10 inch on a titanium voice coil former and a 5.1 inch Hexatech aluminium coil, rated 600 watts RMS and 2000 watts transient, 5.63 inches deep on a 10.35 inch frame, 9.5 mm of excursion each way. It ships as the SC102 (2 ohm) and the SC104 (4 ohm), and morel measures the two coils separately and publishes a different parameter set for each: the SC102 (2 ohm) at Fs 33.0 Hz, Qts 0.38 and Vas 42.0 liters, the SC104 (4 ohm) at Fs 29.0 Hz, Qts 0.35 and Vas 50.0 liters. The cabinet is sized to the SC102, the coil that asks for the larger box, and the SC104 sits a little below Butterworth in the same airspace.

Two Chambers, Not One Volume

This enclosure follows the Proline X standing rule for dual sealed builds: two fully separate chambers split by a bonded full height 3/4 inch MDF divider, each driver in its own 0.60 cubic feet with its own polyfill.

Two drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment either would have on its own. A full divider removes that entirely. One shared side mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.

Net Volume, Not Gross

Each chamber is built at 0.60 cubic feet net per driver, out of 1.41 gross after the divider, the brace and Morel's published 2.3 liter driver displacement. Morel's own sealed recommendation for this driver is 13 to 30 liters, 0.46 to 1.06 cubic feet, and this volume is inside it. At 0.60 cubic feet the SC102 lands at Qtc 0.707 with system resonance at 61.4 Hz and an anechoic half-power point of 61.4 Hz; the SC104 sits at Qtc 0.694.

True net, not marketing net. Internal volume is calculated from the machined cavity dimensions and the driver's published displacement, not estimated from external dimensions minus wall thickness.

Coil (per chamber)	System Qtc	fc	F3
SC102, 2 ohm (cabinet sized to this coil)	Qtc 0.707	61.4 Hz	61.4 Hz
SC104, 4 ohm	Qtc 0.694	57.5 Hz	58.6 Hz

Two coils, two parameter sets. Every figure comes from Morel's current Ultimo Titanium SC specification sheet, whose columns reproduce their own moving mass from Vas, cone area and resonance to within a gram. Morel's older printed manual carries a different parameter set for these drivers that does not, and it is not used here.

Down Fire Construction

Cut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3/4 inch MDF. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.

The cabinet measures 30.00 inches wide by 15.00 inches deep by 8.82 inches tall, measured in the down fire position and excluding standoffs. Plan the space around the installed height rather than the cabinet height: the standoffs hold 1.75 inches under the baffle, so the finished stack sits near 10.57 inches.

Double Baffle, Flush Recess

The front baffle is 1.5 inches, two bonded 3/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3/4 inch of internal clearance.

Side-Mounted Terminal Cup

Proline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in 12 gauge OFC to both driver positions. Side mounted so it stays accessible with the baffle facing the floor.

Standoffs Included

Morel publishes no front clearance figure for the Ultimo Titanium SC, so this cabinet uses the Proline X standard 1.75 inch standoff, shipped with every enclosure and left uninstalled so you can place them to suit your floor.

Motor Clearance and Orientation

The motors rise off the baffle into the cavity, so on a down fire cabinet the clearance that matters runs to the top panel. The 5.63 inch mounting depth puts the motor 4.13 inches into a 6.57 inch cavity, leaving 2.44 inches above the motor against a 0.75 inch minimum. Height was set by the airspace, above the minimum the clearance alone would have required.

Morel does not publish a position on down firing this driver, and this cabinet makes no claim on their behalf. The feet ship uninstalled, so if you would rather run it front firing or up firing, that is a decision you can make at install time without changing anything about the enclosure.

Power and Warranty

Morel rates the Ultimo Titanium SC at 600 watts RMS and 2000 watts transient, 1200 watts RMS combined. Both coils are single voice coil drivers: the SC102 is a nominal 2 ohm load (1.3 ohm DC), the SC104 a nominal 4 ohm load (3.0 ohm DC). Wire both drivers identically: two SC102 in parallel is 1 ohm and needs an amplifier rated for it, in series 4 ohms; two SC104 run 2 ohms in parallel or 8 ohms in series. Confirm the load against your amplifier's minimum stable impedance before powering the system.

The enclosure carries a 1 year limited warranty. Bring your own a pair of Morel Ultimo Ti SC102 / SC104; the drivers are purchased separately.

Cut for the Driver, Not the Catalog

Built one at a time in Tullahoma, Tennessee, with standoffs and a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.

Specifications

Specification	Value
Series	Proline X Performance Optimized Down Fire
Compatible Driver	Morel Ultimo Titanium SC, SC102 or SC104, quantity 2. Direct fit
Configuration	Dual 10 inch, two separate chambers, sealed down fire
Mounting Position	Trunk or cargo floor, baffle facing down on standoffs
Firing Direction	Downward. Feet ship uninstalled, so front or up firing is also possible
External Width	30.00 in
External Depth	15.00 in
External Height	8.82 in in the down fire position, excludes standoffs
Installed Height	10.57 in including the 1.75 in standoff
Internal Volume, Gross	1.41 cu ft total
Internal Volume, Net Acoustic	0.60 cu ft per chamber after the divider, the brace and Morel's published 2.3 L displacement per driver
Height Set By	Airspace; clearance alone would allow a lower cabinet
Driver Mounting Depth	5.63 in required, 2.44 in clearance above the motor
Morel Published Sealed Range	13 to 30 liters, 0.46 to 1.06 cubic feet, including driver displacement
Alignment, SC102 (2 ohm) per chamber	Qtc 0.707, fc 61.4 Hz, F3 61.4 Hz anechoic; the cabinet is sized to this coil
Alignment, SC104 (4 ohm) per chamber	Qtc 0.694, fc 57.5 Hz, F3 58.6 Hz anechoic, in the same cabinet
Woofer Opening	8.87 in (225.15 mm) direct fit, two
Frame Outer Diameter	10.35 in (263 mm), Morel spec
Bolt Circle	9.96 in (253 mm), Morel drawing; inserts pressed to it
Driver Displacement	2.3 L / 0.08 cu ft, published by Morel
SC102 Fs / Qts / Qes / Qms	33.00 Hz / 0.38 / 0.48 / 1.75
SC102 Vas / Mms / Cms / BL	42.00 L / 91.6 g / 0.250 mm/N / 7.06 T-m
SC104 Fs / Qts / Qes / Qms	29.00 Hz / 0.35 / 0.43 / 1.84
SC104 Vas / Mms / Cms / BL	50.00 L / 101.7 g / 0.300 mm/N / 11.00 T-m
Driver Sd	346 cm2, published by Morel
Xmax	9.5 mm one way, published as plus or minus 9.5 mm each way; 12 mm gap
DC Resistance	SC102 1.3 ohm; SC104 3.0 ohm
Driver Sensitivity	88 dB (SC102) and 87 dB (SC104) at 2.83 V, Morel spec; 86.8 and 86.4 dB at 1 W derived from the parameters
Driver Power Handling	600 W RMS / 2000 W transient per driver
Wiring Options	Single voice coil: SC102 nominal 2 ohm, SC104 nominal 4 ohm; two drivers in parallel halve it, in series double it
Voice Coil	130 mm (5.1 in) Hexatech aluminium on a titanium former, 31 mm winding height
Parameter Source	Morel Ultimo Titanium SC specification sheet; Morel's 2016 manual prints a different set that is not used
Material	Langboard Elite MDF
Construction	CNC cut, V-groove and dado joinery, square corners
Panel Thickness	0.75 in
Front Baffle	1.5 in double baffle, outer layer machined as a flush recess
Internal Bracing	Full-height 3/4 in divider plus perimeter brace
Driver Mounting Hardware	Threaded inserts pressed to the Morel bolt pattern, stainless machine screws included
Terminal Cups	One Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC to both driver positions
Standoffs	Included, 1.75 in, shipped uninstalled
Damping	Light polyfill wall lining, does not alter acoustic volume
Carpet	Plush black
Weight	36 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.60

cu ft per chamber

System Qtc

0.69–0.71

sealed

Half power

58.6–61.4

Hz · F3

Xmax at

191

W RMS · no filter

With 25 Hz subsonic

232

W RMS · +22%

Amplifier

600

W RMS recommended

This enclosure holds 0.60 cu ft net per chamber. In it the Morel Ultimo Ti SC102 / SC104 runs a system Qtc of 0.69–0.71 with half power at 58.6–61.4 Hz, and the cone reaches its 9.5 mm travel limit at 191 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 232 W — +41 W, or 22 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

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

0.60 cu ft against a 42.0 L Vas.

α = Vas ÷ Vb = 2.46 · Fc = Fs√(α+1) = 57–61 Hz · Qtc = 0.69–0.71

SC102, 2 ohm · Qtc 0.71, Fc 61 Hz, F3 61.4 HzSC104, 4 ohm · Qtc 0.69, Fc 57 Hz, F3 58.6 Hz

The box lifts resonance from 29.0–33.0 Hz free-air to 57–61 Hz and half power lands at 58.6–61.4 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. Each chamber of this down-fire dual holds 0.60 cubic feet, the same airspace as the dual wedge in a floor-firing shape, so the two are acoustically the same cabinet.

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.

P_Xmax = 191–221 W unfiltered → 232–258 W with a 25 Hz subsonic

SC102, 2 ohm · 221 W, no filterSC104, 4 ohm · 191 W, no filterSC102, 2 ohm · 258 W with subsonic at 25 Hz, 24 dB/octSC104, 4 ohm · 232 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 191 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 232 W before hitting the same 9.5 mm. That is 22 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	33.00 / 29.00	Hz	free-air resonance
Qts	0.380 / 0.350		SC102, 2 ohm / SC104, 4 ohm
Vas	42.00 / 50.00	L	equivalent compliance
Sd	346.0	cm²	effective piston area
Xmax	9.5	mm	one-way, Morel prints it as plus or minus 9.5 mm each way
Pe	600	W	continuous RMS
SPL	86.8	dB	1 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.

Materials

Material

Built From a Spec Sheet, Not a Sales Sheet

Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF, 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure, because we chose the material based on those numbers, not on price or availability.

Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.

Specifications

Langboard Elite MDF: Published Mill Data

Property	Value	Why It Matters
Panel Stock	Langboard Elite MDF	Named, verifiable panel source, not generic "high-density MDF"
Thickness	3/4" (18mm)	Industry standard for subwoofer enclosures; panels below this flex under pressure
Density	48.5 lbs/ft³	Higher density = less porosity, better screw retention, reduced resonance
Internal Bond	200 psi	Measures resistance to delamination under sustained internal pressure. The most enclosure-relevant spec on this sheet
Modulus of Rupture (MOR)	4,200 psi	Bending strength before the panel breaks, relevant for larger unsupported baffle spans
Modulus of Elasticity (MOE)	410,000 psi	Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance
Face Screw Holding	325 lbs	How firmly the panel surface holds a screw; critical for baffle joint integrity over time
Edge Screw Holding	250 lbs	Panel edge retention, relevant for every joint that isn't face-to-face

Internal Bond

200 psi: The Number That Actually Matters for Enclosures

The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually. The symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.

Stiffness

410,000 psi MOE: Less Flex, Less Resonance

The modulus of elasticity measures panel stiffness, its resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level, not the panel level. The bass you hear comes from the driver, not the box.

Screw Holding

325 lb Face / 250 lb Edge: Joints That Stay Locked

Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint, where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.

Sourcing

Named Panel Stock: Not "Premium MDF"

The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification. It is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.

Why Proline X?

Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements, and in how the box holds up two years into daily use.

CNC-Cut to Spec

Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.