Performance Optimized Wedge Sealed 13" Enclosure | JL Audio 13W3v3

Proline X

Performance Optimized Wedge Sealed 13" Enclosure | JL Audio 13W3v3

Q: What size enclosure does the JL Audio 13W3v3 need?

JL Audio publishes different sealed specs per impedance variant. The 13W3v3-2 wants 1.750 cubic feet net (F3 37.7 Hz, Qtc 0.96). The 13W3v3-4 wants 1.500 cubic feet net (F3 40.4 Hz, Qtc 0.89). The 13W3v3-8 wants 1.750 cubic feet net (F3 37.2 Hz, Qtc 0.96). The Audio Intensity Performance Optimized Wedge Sealed 13 for W3 delivers 1.85 cubic feet gross internal (1.754 cubic feet net after the 13W3v3's 0.096 cubic foot driver displacement) — essentially exact match to JL's 13W3v3-2 and 13W3v3-8 spec.

Q: What are the dimensions of the Performance Optimized Wedge Sealed 13 for the JL W3v3?

The Performance Optimized Wedge Sealed 13 for JL Audio W3v3 measures 24" wide x 16" tall externally, with a wedge-shaped depth of 10.35" at the top and 16.2" at the bottom. The angled seat-side face sits approximately 20 degrees back from vertical, designed to match the lean of typical sedan and coupe rear seat backrests.

Q: Why choose a wedge enclosure for the JL Audio 13W3v3?

A wedge enclosure fits trunks that rectangular cabinets can't. The angled seat-side face (10.35" at top, 16.2" at bottom) matches the natural lean of most factory rear seat backrests, tucking against the seat with no wasted gap. The 13W3v3 mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity, using the trunk itself as an acoustic loading chamber — a smoother, less-localized bass presentation than direct-firing setups.

Q: How much power can the JL Audio 13W3v3 handle?

The JL Audio 13W3v3 handles 600 watts RMS continuous, with JL recommending amplifier power in the 150 to 600 watt RMS range. For balanced output and long-term reliability in the Performance Optimized Wedge Sealed 13 enclosure, pair the 13W3v3 with a clean, well-regulated monoblock amplifier delivering 400 to 600 watts RMS at your chosen impedance. JL Audio RD or XD series 600/1 amps are natural matches.

Q: What impedance options are available for the JL Audio 13W3v3?

The JL Audio 13W3v3 is available in three single-voice-coil configurations: 13W3v3-2 (Single 2-ohm), 13W3v3-4 (Single 4-ohm), and 13W3v3-8 (Single 8-ohm). The 2-ohm variant is the most common choice for modern class D monoblock amplifiers, delivering maximum power output. The 4-ohm variant is easier on both amp and driver for daily use. The 8-ohm variant is rare, used mainly with bridged high-voltage amp configurations or matched Class AB setups. The Performance Optimized Wedge Sealed 13 cabinet is optimized for the 2-ohm and 8-ohm variants' shared 1.75 cu ft JL spec.

Q: What is the mounting depth of the JL Audio 13W3v3?

The JL Audio 13W3v3 has a mounting depth of 7.63 inches, a mounting hole cutout of 12.5625 inches, and an outer diameter of 14 inches. The Performance Optimized Wedge Sealed 13 cabinet has ample internal depth clearance: 10.35 inches at the top of the vertical baffle to 16.2 inches at the bottom, providing comfortable clearance behind the driver for motor breathing and cooling.

Q: Can the JL Audio 13W3v3 be used with a passive crossover?

No. JL Audio explicitly recommends against using this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance. Instead, use your amplifier's active low-pass filter to set the sub's upper cutoff frequency — typically between 80 and 100 Hz for musical accuracy in a full-range system.

Q: Where is the Performance Optimized Wedge Sealed 13 for JL W3v3 manufactured?

The Performance Optimized Wedge Sealed 13 for JL Audio W3v3 is manufactured in Tullahoma, Tennessee, USA at the Audio Intensity facility. Every panel is CNC-cut on ShopSabre routers from premium Langboard Elite MDF, then assembled, carpet-wrapped, and finished by hand. Assembly begins after your order is placed — no pre-built inventory warping in storage. Expect a 2 to 5 business day build window before shipment.

SKU: PO 13-S W W3

QUICK SPECS

Best For: JL Audio 13W3v3-2 Trunk-Fit High-Output Daily Driver Builds
Net Volume: 1.754 cu ft (JL 2Ω/8Ω Spec: 1.750 | 1.85 cu ft Gross)
Driver Match: JL Audio 13W3v3-2, -4, or -8 (SVC)
Construction: Rear-Firing Wedge | V-Groove/Dado | Threaded Inserts

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.

$ 319.99

In Stock and Ready to Ship

Financing available — choose Shop Pay Installments at checkout.

Performance Optimized Wedge Sealed 13" Enclosure | JL Audio 13W3v3

$ 319.99

Enclosure Type Sealed

External Dimensions 24" W x 16" H x 16.2" D at base tapering to 10.35" D at top

Net Volume 1.75cu ft

Tuning Frequency NA

Cutout Diameter Direct Fit

Front Panel Thickness 1.5"

Max Mounting Depth Direct Fit

INSTALLER'S TAKE

The JL Audio 13W3v3 is the driver you buy when you want a JL W3 that goes deeper and hits harder than the 12 can, without stepping up to a W6 or W7 price bracket. 13.5" of cone area — 54% more piston than the 12W3v3 — with the same NBR rubber surround, DMA-optimized motor, mineral-filled polypropylene cone, and JL's Floating Cone Attach Method surround geometry. 600 watts RMS instead of the 12W3's 500, and a published F3 of 37.7 Hz in the -2 spec box (versus 41.8 Hz for the 12W3v3-2). It's the biggest W3, and in the right cabinet it delivers a real step up in output and extension over the 12.

Now, the same rule from the 12W3 build applies here — different JL specs for different impedance variants. The 13W3v3-2 wants 1.75 cu ft net. The 13W3v3-4 wants 1.5 cu ft net. The 13W3v3-8 wants 1.75 cu ft net. This cabinet delivers 1.85 cu ft gross minus the 0.096 cu ft driver displacement = 1.754 cu ft net. Right on JL's 1.75 spec for both the 2-ohm and 8-ohm variants.

Same reasoning as the 12W3 wedge for why we optimize for the 2-ohm spec. Most modern class D monoblocks hit their peak output at 2-ohm stable loads, so if you're running any of the JL RD or XD series 600/1 amps or a comparable competitor product, the 2-ohm 13W3v3 is going to pull more clean power out of that amp than the 4-ohm would. Second, JL's Qtc 0.96 alignment for the -2 gives you that warm, punchy, midbass-forward character that fills a car cabin nicely. Combined with the 13.5" cone's deep extension, you get bass that reaches lower AND hits harder than the smaller drivers can match. That's the whole point of stepping up to a 13.

The 4-ohm variant works in this cabinet too, but it's running in a box slightly larger than its 1.5 cu ft spec — 1.754 vs 1.5 puts it at a Qtc closer to 0.82 instead of the 0.89 JL targets. Still warm, still musical, just a hair flatter than the -2. Some listeners will actually prefer that. It's a valid setup either way.

The 8-ohm variant is unusual — most car audio installs run 2 or 4 ohms because that's what the amps are stable at. The 13W3v3-8 exists mainly for bridged high-voltage amp configurations or for people running Class AB amplifiers that like higher impedance loads. If you're one of those unusual builds, this cabinet is dialed for you too — same 1.75 cu ft spec as the 2-ohm.

The wedge geometry is the standard PO trunk-load pattern. Rear seat backs lean around 20 degrees from vertical, and the 10.35" top to 16.2" bottom depth difference on the seat-side face gives you a 20-degree wedge that tucks flush against the seat back. The vertical trunk-lid-side baffle is where the 13W3v3 mounts, firing rearward into the trunk cavity for the classic SQ install pattern. Trunk-load loading, smoother cabin transmission, no cargo space stolen from the front of the trunk.

Cabinet size is honest 13" territory — 24" wide, 16" tall, ~13.3" average depth. That's a substantial box. It's not going in a Civic Si. You need a sedan or wagon or coupe with a proper trunk. The height in particular (16") may creep above the parcel shelf line in some low-roof coupes, so if you're doing a low-slung sports car build, check your trunk opening dimensions before ordering. In any midsize or full-size sedan trunk, wagon, or SUV cargo area, it fits fine.

Power target: JL specs 150 to 600 watts RMS. Real-world sweet spot is 400 to 600 watts. The 13W3v3 handles its rated 600 comfortably, and unlike some drivers that clip thermally near their rating, the 13's larger voice coil and Elevated Frame Cooling design makes it happy at sustained daily use. Match with a well-regulated monoblock class D amp delivering 500-600 watts RMS at your chosen impedance and you'll get the driver's full potential.

Same JL warning as always: do not use a passive crossover coil in series with this driver. Use your amp's built-in active low-pass filter, set between 80-100 Hz for musical accuracy.

If you want the biggest W3 JL makes in a cabinet that hits their exact 2-ohm sealed spec, in trunk-fit wedge form, this is it.

Product Details

Performance Optimized Wedge | JL Audio 13W3v3

Single 13.5" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design for the JL Audio W3v3

1.85 ft³ Gross 1.75 ft³ Net (JL 2Ω Spec) Rear-Firing Wedge 24" × 16" × 10.35/16.2" V-Groove / Dado Built in Tennessee

The JL Audio 13W3v3 in JL's Spec-Perfect Sealed Volume

The JL Audio 13W3v3 is JL's oversized 13.5" driver — a 600 watt RMS workhorse that moves 54% more air than the 12W3v3, delivering deeper extension and higher output at the same amplifier power level. Available in Single 2-ohm (13W3v3-2), Single 4-ohm (13W3v3-4), and Single 8-ohm (13W3v3-8) configurations, this driver uses JL's DMA-optimized motor, a mineral-filled polypropylene cone, and JL's NBR rubber surround with Floating Cone Attach Method for long-term reliability under sustained daily use.

The Performance Optimized Wedge Sealed 13 for JL Audio W3 is engineered to hit JL's exact 13W3v3-2 sealed specification. 1.85 cubic feet gross internal volume minus the 13W3v3's 0.096 cubic foot driver displacement equals 1.754 cubic feet net — matching JL's published 1.750 cubic foot sealed spec for both the 2-ohm and 8-ohm variants. In that alignment, the driver delivers F3 of 37.7 Hz and Qtc of 0.96 — deep, warm, high-impact bass in a trunk-friendly wedge cabinet.

1.85 cubic feet gross = 1.754 cubic feet net after the 13W3v3's 0.096 cubic foot driver displacement. Exact match to JL Audio's published sealed spec for the 13W3v3-2 and 13W3v3-8 (Qtc 0.96, F3 37.7 Hz). The 13W3v3-4 variant also fits this cabinet, running slightly larger than its 1.5 cu ft spec for a Qtc around 0.82. The wedge geometry mounts the woofer on the vertical trunk-lid-side face, firing rearward into the trunk cavity.

Trunk-Load Wedge Design Explained

This wedge is not a front-firing enclosure. The woofer is mounted on the vertical face that sits at the back of the box, closest to the trunk lid, and fires rearward into the trunk cavity. The angled face is on the opposite side of the box — the side that faces the front of the vehicle — and tucks against the rear seat back. Two different problems solved by one geometry.

Seat-Side Face Matches Seat Lean

Most factory rear seat backs lean roughly 20 degrees back from vertical. The angled face of this wedge (10.35" at the top, 16.2" at the bottom) matches that lean, tucking against the seat back with no wasted gap. The wedge fills the trunk shelf area behind the seat cleanly.

Trunk-Lid-Side Face Fires the Woofer

The vertical face on the opposite side of the wedge (24" wide × 16" tall) is where the 13W3v3 mounts. The driver fires rearward toward the trunk lid, using the trunk cavity as an acoustic loading chamber. This is the classic SQ trunk-load install pattern.

Trunk Cavity Loading

Firing the woofer into the trunk cavity rather than directly into the cabin uses the trunk itself as an extension of the acoustic system. Low frequencies transmit into the passenger cabin through the rear deck, seat back, and cabin boundaries — a smoother, less localized presentation than direct-firing setups.

Preserves Trunk Cargo Space

The wedge tucks against the seat back where cargo can't be stored anyway. The bottom face sits flat and stable on the trunk floor. Cargo space in front of the wedge (toward the trunk lid) stays usable for daily driving.

Engineered to JL Audio's Published Sealed Specification

JL Audio publishes different sealed enclosure specs for each impedance variant of the 13W3v3. The 13W3v3-2 wants 1.750 cubic feet net (F3 37.7 Hz, Qtc 0.96). The 13W3v3-4 wants 1.500 cubic feet net (F3 40.4 Hz, Qtc 0.89). The 13W3v3-8 wants 1.750 cubic feet net (F3 37.2 Hz, Qtc 0.96). This cabinet is engineered specifically to hit the 1.75 cu ft target used by both the 2-ohm and 8-ohm variants: 1.85 cubic feet gross minus the 0.096 cubic foot driver displacement equals 1.754 cubic feet net — essentially exact match.

What the JL 2Ω Spec Delivers

JL engineered the 13W3v3-2 for a Qtc of 0.96 in a 1.75 cubic foot sealed enclosure. That's a higher Qtc than the traditional "flat" 0.707 alignment, giving the driver a warm, impactful, midbass-forward bass character. Combined with the 13.5" cone's deep F3 of 37.7 Hz, this alignment produces a bass presentation that reaches lower AND hits harder than the smaller W3v3 drivers can match — the reason to step up to the 13" is precisely this combination of depth and impact from a single driver. Listeners looking for a flatter, more analytical alignment can use the 13W3v3-4 in this cabinet instead — the -4 in a slightly-larger-than-spec 1.754 volume trends toward Qtc 0.82, still warm but flatter than the -2 and -8.

Mounting Geometry

The vertical trunk-lid-side baffle is cut to the 13W3v3's exact 12.5625" cutout specification. The 13W3v3's 7.63" mounting depth fits inside the cabinet — internal depth from the vertical baffle to the interior of the angled seat-side face ranges from 10.35" at the top to 16.2" at the bottom, providing ample clearance for the driver's motor and cooling requirements. 8/32 threaded inserts are pressed into the baffle backside for secure driver retention. The 14" outer diameter of the 13W3v3 sits within the 16" tall baffle with adequate clearance for mounting flange.

Performance Series Construction, Driver-Specific Tuning

Langboard Elite MDF

Premium 3/4" MDF panels milled to documented spec — denser and more dimensionally stable than commodity MDF. Less panel resonance, tighter joints, and a longer service life under daily use at the 600 watts RMS the 13W3v3 handles.

V-Groove and Dado Joinery

CNC-cut V-grooves at every panel intersection let the wedge cabinet fold into its angled shape with maximum glue surface. Dado joints lock the vertical woofer baffle and the angled seat-side panel into the side walls — no fasteners visible from outside, no exposed end grain at joints.

8/32 Threaded Inserts

Threaded inserts pressed into the vertical woofer baffle accept stainless steel mounting screws. No stripped pilot holes, no MDF damage from drywall screws, no surprises when the next driver upgrade rolls around.

Pre-Wired Terminal Cup

Proline X ABS/carbon fiber composite terminal cup, pre-wired with 12-gauge OFC inside the cabinet, with stainless steel hardware accepting both spade and banana terminations on the input side.

Every panel is cut on ShopSabre CNC routers in our Tullahoma, TN facility. The angled seat-side panel requires precise CNC compound cuts to hit both the volume target and the mating angles between the top and bottom edges — tolerances that manual fabrication can't reliably hold. Internal volume is verified on every unit to ensure the JL-spec 1.75 cubic foot net target is achieved.

Customize Your Build

Carpet Finish

Dark Gray Trunkliner is the standard durable wrap, matched to most factory trunk and cargo-area carpet tones. Plush Black (+$10) is a deeper, more luxurious nap that pairs well with blacked-out interiors and show builds.

Acrylic Insert Color

Choose Black, Blue, Red, or White for the baffle insert to match your build. Or skip the insert entirely (-$40) for a clean, understated look. The insert is purely cosmetic — performance is identical across colors.

Box-Only or Loaded

Add a JL Audio 13W3v3-2 (2-ohm), 13W3v3-4 (4-ohm), or 13W3v3-8 (8-ohm) driver directly to your order and we'll ship the complete loaded system, ready to wire to your amplifier. This cabinet is optimized for the 2-ohm and 8-ohm variants' 1.75 cu ft spec. Already own your 13W3v3? Order the enclosure box-only and drop in the driver you have.

Wiring the JL Audio 13W3v3 to Your Amplifier

The JL Audio 13W3v3 is a single voice coil driver available in three impedance versions. The pre-wired terminal cup accepts the two-conductor connection via 12-gauge OFC, with stainless steel input hardware.

The 13W3v3-2 (Single 2-ohm) presents a 2-ohm load directly to your amplifier — the most common choice, delivering the highest power output from most modern class D monoblocks stable at 2 ohms. The 13W3v3-4 (Single 4-ohm) presents a 4-ohm load — easier on both amp and driver for daily use. The 13W3v3-8 (Single 8-ohm) presents an 8-ohm load — used mainly with high-voltage amp bridges or matched with class AB amplifiers.

The 13W3v3 is rated for 600 watts RMS continuous, with JL Audio recommending amplifier power in the 150 to 600 watt RMS range. Aim for a clean, well-regulated amplifier delivering 400 to 600 watts RMS at your chosen impedance for balanced output and long-term reliability. JL Audio's own RD or XD series 600/1 monoblocks are natural matches.

Important: JL Audio explicitly recommends against using this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance. Use your amplifier's active low-pass filter to set the sub's upper cutoff, typically between 80 and 100 Hz for musical accuracy.

Built in Tennessee, Backed by Audio Intensity

Every Performance Optimized enclosure is CNC-cut, assembled, and finished in our Tullahoma, TN facility. Components are pulled from inventory after your order is placed, then bonded and wrapped — a 2 to 5 business day assembly window before the box ships. No pre-built inventory sitting in warehouses, warping in storage. Each unit is built to order.

Backed by a 1-year limited warranty against structural failure and hardware defects. Questions on fitment, wiring, or amplifier pairing? Contact us — we install this gear ourselves, in our own vehicles.

JL's Spec Volume for the 13, in a Trunk-Load Wedge

1.75 cubic feet net internal — JL Audio's published optimum sealed volume for the 13W3v3-2 and 13W3v3-8 — in a trunk-friendly wedge geometry that fires the 13.5" cone rearward into the trunk cavity. Deep extension, high impact, precise driver-specific engineering.

Specifications

Enclosure Type	Sealed \| Wedge Geometry \| Rear-Firing Trunk-Load
Driver-Specific Fitment	JL Audio 13W3v3-2 (SVC 2Ω), 13W3v3-4 (SVC 4Ω), 13W3v3-8 (SVC 8Ω)
Internal Volume (Gross)	1.85 Cubic Feet
Internal Volume (Net After Displacement)	1.754 Cubic Feet (JL 2Ω/8Ω Spec: 1.750)
Baffle Configuration	Vertical Trunk-Lid-Side Woofer Mounting Face
Material	Langboard Elite 3/4" MDF
Front Baffle Construction	Double-Layer 1.5" MDF (Two 3/4" Sheets Bonded)
Joinery	V-Groove and Dado (CNC-Cut)
Construction	ShopSabre CNC / Angled Seat-Side Compound Cuts
External Width	24 Inches
External Height	16 Inches
External Depth (Top)	10.35 Inches
External Depth (Bottom)	16.2 Inches
Baffle Angle	~20° From Vertical (Seat-Side Face)
Mounting Hole Diameter	12.5625 Inches
Mounting Hardware	8/32 Threaded Inserts \| Stainless Steel Screws Included
Terminal Cup	Proline X ABS/Carbon Fiber Composite \| 12g OFC Pre-Wired
Damping	Polyfill Pre-Installed
Recommended Power	400-600 Watts RMS (150-600W JL Spec Range)
Target Qtc / F3 (13W3v3-2)	0.96 / 37.7 Hz (JL Published Sealed Spec)
Carpet Finish	Dark Gray Trunkliner (Standard) or Plush Black (+$10)
Acrylic Insert	Black, Blue, Red, White, or None (-$40)
Bundle Options	Box Only \| Add a JL Audio 13W3v3 Driver (2Ω, 4Ω, or 8Ω)
Warranty	1-Year Limited (Enclosure)
Manufactured	Tullahoma, Tennessee, USA

Performance Graphs

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.