Performance Optimized · Datasheet
Performance Optimized Wedge Sealed Dual 12" Enclosure | Prodigy NB5-12 Dual 12" Sealed enclosure
- Net volume
- 0.67 Cubic Feet
- Max mounting depth
- 8.75 Inches (Prodigy Spec)
- Cutout
- 11.25 Inches (Prodigy Spec)
- External dimensions
- 29.25 Inches W × 14.5 Inches H × 9.5 Inches / 14.75 Inches D
- Front baffle
- Vertical Trunk-Lid-Side Woofer Mounting Face | Both Drivers
- Best For: Dual Prodigy NB5-12 Trunk-Fit Builds
- Net Volume: 0.67 cu ft per chamber (1.76 cu ft Gross Total)
- Driver Match: Pair of Prodigy NB5-12 (D2 or D4, matched)
- Construction: Dual Chamber Wedge | V-Groove/Dado | Double 1.5" Baffle | 2 Terminal Cups
Technical specifications
| Enclosure Type | Sealed | Dual Driver | Wedge Geometry | Rear-Firing Trunk-Load |
|---|---|
| Chamber Configuration | Two Fully Separate Chambers | Full-Height Divider | Single Shared Side-Mounted Terminal Cup |
| Driver-Specific Fitment | Prodigy NB5-12 - NB5-12D2 (DVC 2Ω) or NB5-12D4 (DVC 4Ω) | Pair Required |
| Total Internal Gross Volume | 1.76 Cubic Feet |
| Per-Chamber Gross Volume | 0.88 Cubic Feet |
| Per-Chamber Net Volume (After Displacement) | 0.67 Cubic Feet |
| Per-Chamber Target Qtc (D2) | 0.57 (Extended Musical | Based on Published T/S) |
| Per-Chamber Target Qtc (D4) | 0.71 (Near-Butterworth | Based on Published T/S) |
| Predicted F3 Per Driver | ~48-58 Hz (Depending on Coil) |
| Predicted Fc Per Driver | ~47 Hz |
| Driver Displacement (Each) | 0.21 Cubic Feet (Published by Prodigy) |
| Baffle Configuration | Vertical Trunk-Lid-Side Woofer Mounting Face | Both Drivers |
| Material | Langboard Elite 3/4" MDF |
| Front Baffle Construction | Double-Layer 1.5" MDF (Two 3/4" Sheets Bonded) at Both Driver Positions |
| Chamber Divider | 3/4" MDF Full-Height Bonded Panel |
| Joinery | V-Groove and Dado (CNC-Cut) |
| Construction | ShopSabre CNC / Angled Seat-Side Compound Cuts / Perimeter Cross-Brace |
| External Width | 29.25 Inches |
| External Height | 14.5 Inches |
| External Depth (Top) | 9.5 Inches |
| External Depth (Bottom) | 14.75 Inches |
| Baffle Angle | ~20° From Vertical (Seat-Side Face) |
| Mounting Hole Diameter (Each) | 11.25 Inches (Prodigy Spec) |
| Mounting Depth Required (Each) | 8.75 Inches (Prodigy Spec) |
| Mounting Hardware | 8/32 Threaded Inserts | Stainless Steel Machine Screws Included | 2 Sets |
| Terminal Cup | One Proline X ABS/Carbon Fiber Composite | Side Mounted | 12g OFC Pre-Wired to Both Driver Positions |
| Damping | Polyfill Pre-Installed Per Chamber |
| Recommended Power Per Driver | 800-1200 Watts RMS (Prodigy Rated: 1200W RMS Continuous) |
| Carpet Finish | Dark Gray Trunkliner (Standard) or Plush Black |
| Acrylic Insert | Black, Blue, Red, White, or None |
| Bundle Options | Enclosure Only (Bring Your Own Pair of NB5-12D2 or NB5-12D4) |
| Warranty | 1-Year Limited (Enclosure) |
| Manufactured | Tullahoma, Tennessee, USA |
Performance in this enclosure
01Is it a sealed driver?
Efficiency bandwidth product places the motor before anything else is decided.
02What the box does to it
0.67 cu ft against a 14.0 L Vas.
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 27.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.
| Param | Value | Unit | Note |
|---|---|---|---|
| Fs | 35.80 | Hz | free-air resonance |
| Qts | 0.432 / 0.533 | D2 / D4 | |
| Vas | 14.02 / 14.33 | L | equivalent compliance |
| Sd | 490.7 | cm² | effective piston area |
| Xmax | 27 | mm | one-way linear travel |
| Pe | 1200 | W | continuous RMS |
| SPL | 83.2 | dB | 1 W / 1 m, derived from T/S |
Driver parameters as published by prodigyaudio.com product page; Sd derived from Vas and Cms · prodigyaudio.com product page; Sd derived from Vas and Cms; published Fs runs ~21% below what their own Cms and Mms imply. Curves computed against this enclosure’s actual net airspace.
Installer's take
This is the dual-12 wedge for people who want to run a pair of NB5-12s in a single trunk-loading cabinet. Two chambers, one wedge, +6 dB of headroom over a single-driver setup, and per-chamber alignment that lands very close to textbook Butterworth for the D4 coil.
The critical detail on this build is the separate-chamber architecture. Every dual-driver sealed enclosure I build gets a full-height bonded divider between the two chambers. Two drivers in a common sealed chamber will interact acoustically - one driver's compression phase becomes the other driver's cabin-pressure environment, which smears transient response and blurs the alignment character each driver would have on its own. Separate chambers eliminate that entirely. Each NB5-12 sees its own 0.67 net cubic feet and its own polyfill, and produces its own clean sealed alignment.
Per-chamber alignment lands almost exactly at Butterworth for the D4 coil - Qtc 0.71, textbook maximally-flat sealed. The D2 coil in the same per-chamber volume lands at Qtc 0.57 (extended musical, near-Bessel). If your primary target is a Butterworth alignment, this cabinet delivers it cleanly on the D4 coil variant. Fc lands at approximately 47 Hz across both coils.
The double-baffle 1.5" front is not optional. Each NB5-12 exerts serious mechanical load into its mounting flange at high output, and a single 3/4" layer would telegraph flex back into the cone on both driver positions. Two bonded 3/4" layers with the CNC-precision cutouts stops that entirely.
On wiring: this cabinet uses one side-mounted terminal cup that feeds both driver positions in parallel. You set your final impedance at the drivers themselves by how you wire each one's voice coils, which gives you the same flexibility you would have with any dual voice coil pair. Wire both drivers identically. Target 800-1200 watts RMS per driver at whatever load you land on.
Questions
Will this enclosure fit both the NB5-12D2 and NB5-12D4?
Yes. Both mounting locations are direct-fit for either impedance option. Run matched impedance drivers only (both D2 or both D4).
Why does this enclosure have two separate chambers instead of one shared chamber?
All Proline X dual-driver sealed enclosures use two fully separate chambers with a bonded full-height divider between them. Two drivers in a common chamber interact acoustically; separate chambers eliminate that entirely, giving each driver its own dedicated air volume and polyfill damping.
How is this enclosure wired, and how do I set my final impedance?
Two independent Proline X terminal cups, one per chamber, each pre-wired in 12 gauge OFC. Wire in series or parallel externally at the amp. Run matched impedance drivers only.
What amplifier power should I run to this enclosure?
Each NB5-12 is rated 1200W RMS continuous. For a matched pair target 1600-2400W RMS total (800-1200 per driver) at the final wired impedance.
How does a wedge enclosure improve the sound in a trunk installation?
The wedge geometry angles both drivers rear-firing into the trunk at approximately 20 degrees from vertical.
Why is the front baffle double-layered on this enclosure?
Both driver positions get the full double-baffle treatment: two bonded 3/4 inch Langboard Elite MDF sheets with CNC-precision cutouts.
Do I need to add any additional damping or polyfill to this enclosure?
No additional damping required. Each chamber ships with polyfill pre-installed to correct density.
Are the Prodigy NB5-12 subwoofers included with this enclosure?
No. Enclosure only. Bring your own matched pair of NB5-12D2 (DVC 2Ω) or NB5-12D4 (DVC 4Ω) drivers.
Other Performance Optimized models
- Alpine R2-W12 Dual 12" Sealed
- Alpine RSW12 Dual 12" Sealed
- Alpine S2-W12 Dual 12" Sealed
- Arc Audio 10" Arc Series Dual 12" Sealed
- Arc Audio 12" Arc Series Dual 12" Sealed
- Audiofrog GB12 Dual 12" Sealed
- Dual Kicker Solo X 12" Subwoofers Dual 12" Sealed
- Hertz Mille Pro MPS 300 Dual 12" Sealed