Proline X PO 15-S W P3 sealed wedge enclosure, front baffle with gloss black insert and pre-wired leads, 26.25 by 18 inches. Optimized for Rockford Fosgate P3.Proline X PO 15-S W P3 sealed wedge enclosure, side profile with recessed terminal cup, 8.6 inch top, 15.2 inch base, 18 inches tall. Optimized for Rockford Fosgate P3.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 15" Enclosure | Rockford Fosgate P3D2-15 Single 15" Sealed enclosure

Net volume
1.753 Cubic Feet (RF Optimum: 1.58 | Tuned Larger for Lower Qtc)
Cutout
13.94 Inches
External dimensions
26.25 Inches W × 18 Inches H × 8.6 Inches / 15.2 Inches D
Front baffle
Vertical Trunk-Lid-Side Woofer Mounting Face
Buy at Audio Intensity
  • Best For: Rockford Fosgate P3D2-15 Musical Daily-Driver Builds (SQ-Oriented, Full-Range Systems)
  • Net Volume: 1.753 cu ft (Musically Tuned | RF Optimum: 1.58 | 2.0 cu ft Gross)
  • Driver Match: Rockford Fosgate P3D2-15 (DVC 2Ω) or P3D4-15 (DVC 4Ω)
  • Construction: Rear-Firing Wedge | V-Groove/Dado | FlexFit Baffle Ready | Qtc-Tuned for Musicality

Technical specifications

Enclosure TypeSealed | Wedge Geometry | Rear-Firing Trunk-Load
Driver-Specific FitmentRockford Fosgate P3D2-15 (DVC 2Ω) or P3D4-15 (DVC 4Ω)
Internal Volume (Gross)2.0 Cubic Feet
Internal Volume (Net After Displacement)1.753 Cubic Feet (RF Optimum: 1.58 | Tuned Larger for Lower Qtc)
Target System Qtc~1.10 (Musical Alignment) | RF Spec Targets ~1.0 (Peak Output)
Baffle ConfigurationVertical Trunk-Lid-Side Woofer Mounting Face
MaterialLangboard Elite 3/4" MDF
Front Baffle ConstructionDouble-Layer 1.5" MDF (Two 3/4" Sheets Bonded)
JoineryV-Groove and Dado (CNC-Cut)
ConstructionShopSabre CNC / Angled Seat-Side Compound Cuts
External Width26.25 Inches
External Height18 Inches
External Depth (Top)8.6 Inches
External Depth (Bottom)15.2 Inches
Baffle Angle~20° From Vertical (Seat-Side Face)
Mounting Hole Diameter13.94 Inches
Mounting Hardware8/32 Threaded Inserts | Stainless Steel Machine Screws Included (FlexFit Compatible)
Terminal CupProline X ABS/Carbon Fiber Composite | 12g OFC Pre-Wired
DampingPolyfill Pre-Installed
Recommended Power400-600 Watts RMS (RF CEA-2031 Rated: 600W RMS Continuous)
Carpet FinishDark Gray Trunkliner (Standard) or Plush Black
Acrylic InsertBlack, Blue, Red, White, or None
Bundle OptionsEnclosure Only (Bring Your Own P3D2-15 or P3D4-15)
Warranty1-Year Limited (Enclosure)
ManufacturedTullahoma, Tennessee, USA

Performance in this enclosure

Net airspace
1.75
cu ft per chamber
System Qtc
1.10
sealed
Half power
33.4
Hz · F3
Xmax at
755
W RMS · no filter
With 25 Hz subsonic
803
W RMS · +6%
Amplifier
600
W RMS recommended
This enclosure holds 1.75 cu ft net per chamber. In it the Rockford Fosgate P3D2-15 runs a system Qtc of 1.10 with half power at 33.4 Hz, and the cone reaches its 15.2 mm travel limit at 755 W, above the driver’s 600 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 803 W — +48 W, or 6 percent more power for the same 15.2 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 37.4
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 37.4
D2 · EBP 37.4
EBP under 50 means a motor that wants a sealed load. The P3D2-15 sits at 37.4, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

1.75 cu ft against a 155.8 L Vas.

α = Vas ÷ Vb = 3.14  ·  Fc = Fs√(α+1) = 44 Hz  ·  Qtc = 1.10
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 1.10, Fc 44 Hz, F3 33.4 Hz
The box lifts resonance from 21.7 Hz free-air to 44 Hz and half power lands at 33.4 Hz, anechoic, before any cabin gain.

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 15.2 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 755 W unfiltered  →  803 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 16 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 15.2 mm 755 W reaches Xmax here
D2 · 755 W, no filterD2 · 803 W with subsonic at 25 Hz, 24 dB/octXmax 15.2 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 15.2 mm. Unfiltered that is 755 W, reached first at 34 Hz. It sits above the 600 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 803 W before hitting the same 15.2 mm. That is 6 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs21.70Hzfree-air resonance
Qts0.540D2
Vas155.80Lequivalent compliance
Sd894.0cm²effective piston area
Xmax15.2mmone-way linear travel
Pe600Wcontinuous RMS
SPL86.2dB1 W / 1 m, derived from T/S

Driver parameters as published by rockfordfosgate.com. Curves computed against this enclosure’s actual net airspace.

Installer's take

The P3D2-15 is Rockford's most musical 15" driver. Punch series is positioned below the T1 flagship series, but "positioned below" doesn't mean "worse": it means "different design target." The P3 uses an anodized aluminum cone (T1 uses Kevlar-reinforced paper), a hybrid stamp-cast basket (T1 uses full die-cast), a shallower 7.58" mount depth (T1 is 8.39"), and standard nickel-plated push terminals (T1 has SWIFT quick-reconfig terminals). Different tools for different jobs. The P3 is aimed at musical accuracy and versatility. The T1 is aimed at SPL output. Both are Klippel-verified, both use VAST surround, both use FlexFit baskets. RF didn't cheap out on the P3 platform. They just tuned it for a different priority.

Here's the design decision on this box that deserves an explanation. RF publishes 1.58 cu ft as the "optimum" sealed spec for the P3D2-15. That spec targets a system Qtc close to 1.0, which is RF's chosen compromise between peak output and cabinet size. It's a reasonable spec. It's just not the spec I'd pick for a driver that RF themselves market as musical and versatile.

I want the P3D2-15 tuned lower than Qtc 1.099. Around 0.85 is where this driver sings for daily-driver listening. Better transient recovery. Slightly deeper F3. Smoother rolloff. Less peak hump. Better integration with midbass when you're running a proper front stage.

To hit that lower Qtc, I need more airspace than RF's 1.58 spec. Doing the math: 2.0 cu ft gross minus the P3D2-15's 0.247 cu ft mounted displacement = 1.753 cu ft net. About 11% larger than RF's optimum, still well within RF's stated sealed range. Not enough to leave the driver's designed operating envelope. Just enough to shift the Q meaningfully into more musical territory.

This is the whole point of the Performance Optimized name. We take manufacturer specs seriously, but we're not blind to them either. When there's a design decision baked into the manufacturer's spec that doesn't match how the driver will actually be used (musical daily-driver operation, not SPL competition), we adjust. Transparently. With the math visible. Nothing hidden.

If you want the box tuned to RF's exact 1.58 spec for peak SPL output, we can build that too. Send us a note and we'll cut a version dialed to spec. But for the majority of P3D2-15 buyers who want the driver to sound its musical best, this box is the right call.

Wedge geometry is standard PO trunk-load, sized appropriately for a 15" driver with the P3's shallower mounting requirements. 26.25" wide, 18" tall, 8.6" deep at top, 15.2" deep at bottom. The 8.6" top face is notably shallower than the T1D215 wedge's 11.2" top face because the P3's 7.58" mount depth allows it. Smart cabinet design takes advantage of the driver's compact motor, the P3 wedge fits parcel-shelf-limited vehicles that the T1 wedge won't clear.

Loaded weight is much more manageable than the T1 15" build. The P3D2-15's aluminum cone and smaller motor put its shipping weight well below the T1D215's 53.75 lb. Loaded system probably lands around 70-80 lb total. Still a two-person install, but not the "call a friend and pray" territory of the T1 15". Standard parcel shipping usually works fine.

Amplifier pairing is straightforward. RF's own Punch P600X1 monoblock is the natural match, 600W at 1 ohm, class D, well-regulated, factory-matched to the P3 driver's power target. If you want more headroom, the Punch P1000X1bd delivers 1000W at 1 ohm and gives you room to breathe without pushing the driver to its thermal limit. Any modern high-quality class D monoblock stable at 1 ohm in the 400-700W range works. Set low-pass around 80-100 Hz. Subsonic around 25-30 Hz.

Wiring is more traditional than the T1 series. P3 uses standard push terminals instead of SWIFT quick-reconfig terminals. Wire it once and it stays where you put it. Parallel for 1 ohm (max output), series for 4 ohm (higher-impedance amps or dual-driver applications).

Sealed vs ported: RF supports both alignments for the P3D2-15 (1.58 sealed, 2.66 ported). Ported adds output efficiency in the peak-tuned range at the cost of transient accuracy and cabinet size. Sealed keeps the presentation tight and controlled. This is the sealed answer, tuned for musical accuracy. If you want ported, contact us. That's a separate build.

This is an enclosure-only listing. Bring your own P3D2-15 (or P3D4-15, the 4-ohm variant fits identically). Source from any authorized Rockford Fosgate dealer.

If you want Rockford's most musical 15" tuned for how music actually plays in a daily-driven car, in trunk-fit wedge form, this is the box.

Questions

Why is this enclosure larger than Rockford's optimum sealed spec for the P3D2-15?

Rockford Fosgate publishes 1.58 cubic feet as the optimum sealed volume for the P3D2-15, targeting a system Qtc of approximately 1.0 for peak output efficiency. This cabinet is deliberately tuned larger at 1.753 cubic feet net (2.0 cubic feet gross minus the P3D2-15's 0.247 cubic foot displacement) to deliver a lower system Qtc of approximately 0.85. Lower Qtc means better transient response, deeper F3, less peak hump, and a more musically accurate presentation. The 11 percent size increase is well within Rockford Fosgate's stated sealed enclosure range for the P3D2-15 and reflects a deliberate SQ-oriented tuning choice for daily-driver musical use. If you prefer RF's exact 1.58 spec for maximum SPL output, contact us for a build to that spec.

What size enclosure does the Rockford Fosgate P3D2-15 need?

Rockford Fosgate publishes 1.58 cubic feet as the optimum sealed volume for the P3D2-15 (and 2.66 cubic feet for a vented alignment). The recommended sealed range extends above and below the 1.58 optimum. This Performance Optimized Wedge Sealed 15 for Rockford Fosgate P3 is tuned to 1.753 cubic feet net, which sits comfortably within RF's sealed range while delivering a lower system Q for improved musical accuracy versus RF's peak-output-oriented spec.

How does the P3D2-15 compare to the T1D215?

Different Rockford Fosgate design targets. The P3D2-15 is the flagship of the Punch series, positioned for musical accuracy and versatility, 600 watts RMS, anodized aluminum cone, hybrid stamp-cast basket, 7.58 inch mounting depth, standard push terminals. The T1D215 is the flagship of the Power T1 series, positioned for SPL output, 1000 watts RMS, Kevlar-reinforced paper cone, full die-cast basket, 8.39 inch mounting depth, SWIFT quick-reconfig terminals, 229 oz magnet (nearly 2x the P3's magnet). Both share VAST surround technology, FlexFit basket design, Klippel-verified motor characterization, and anodized aluminum voice coil formers. Choose the P3D2-15 for musical daily-driver use at a friendlier price point. Choose the T1D215 for maximum SPL output when the extra power handling and premium construction justify the substantially higher driver cost.

What are the dimensions of the Performance Optimized Wedge Sealed 15 for the Rockford Fosgate P3?

The 15" cabinet measures 26.25" wide x 18" tall externally, with a wedge depth of 8.6" at the top and 15.2" at the bottom. The angled seat-side face sits approximately 20 degrees back from vertical, designed to match the lean of typical rear seat backrests. Notably more trunk-friendly than the T1D215 wedge (which is 28" wide, 11.2" deep at top) because the P3's shallower 7.58" mounting depth allows a lower-profile top face. Still a substantial cabinet requiring a full-size sedan trunk, wagon or SUV cargo area, or pickup extended-cab install with real behind-seat space.

What impedance options are available for the Rockford Fosgate P3 15"

Rockford Fosgate offers the P3 15" in two dual-voice-coil impedance configurations: P3D2-15 (Dual 2-ohm) and P3D4-15 (Dual 4-ohm). Both fit this cabinet identically since RF publishes the same sealed spec across both variants. The P3D2-15 (2-ohm) wires as 1-ohm parallel (maximum output) or 4-ohm series. The P3D4-15 (4-ohm) wires as 2-ohm parallel or 8-ohm series. Unlike the T1 series, the P3 uses standard 10-AWG nickel-plated push terminals rather than SWIFT quick-reconfig terminals. Wire it once and it stays where you put it.

What is the mounting depth of the Rockford Fosgate P3D2-15?

The Rockford Fosgate P3D2-15 has a mounting depth of 7.58 inches (192.5mm) with a cutout diameter of 13.94 inches (353mm). Notably shallower than the T1D215 (8.39 inch mounting depth), which is why the P3 wedge can use a lower-profile 8.6 inch top face vs the T1 wedge's 11.2 inch. The P3D2-15 uses Rockford's FlexFit basket, a slot-mounted frame pattern that allows fine-tuning of the driver's rotational mounting position. Internal cabinet clearance behind the driver: over 10.4 inches at the mounting center, 7.85 inches at the top baffle edge (both after 3/4" MDF panel thickness).

Should I use the P3D2-15 in a sealed or ported enclosure?

Rockford Fosgate supports both alignments for the P3D2-15. Sealed (1.58 cu ft optimum per RF, or the 1.75 cu ft musically-tuned target used in this cabinet) delivers tight, controlled bass with excellent transient response. Ideal for musical accuracy and sound quality installs. Ported (2.66 cu ft per RF spec) delivers additional output efficiency in the peak-tuned range and is preferred for maximum-SPL builds, but doubles cabinet volume and loses transient accuracy. This cabinet is engineered for the sealed alignment with a musical tuning bias. If you need a ported P3D2-15 build, contact us for options.

How much power can the Rockford Fosgate P3D2-15 handle?

The Rockford Fosgate P3D2-15 handles 600 watts RMS continuous (CEA-2031 compliant) with 1200 watts peak. For balanced output and long-term reliability in the Performance Optimized Wedge Sealed 15 enclosure, pair the P3D2-15 with a well-regulated class D monoblock delivering 400-600 watts RMS at your chosen impedance. Rockford Fosgate's own Punch P600X1 monoblock is a natural match, 600W at 1 ohm, factory-tuned to the P3 driver's power target. For more headroom, RF's Punch P1000X1bd delivers 1000W at 1 ohm without pushing the driver to its thermal limit.

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