Audiomobile Encore 12 inch with Sealed Down Firing Enclosure | Previous Display

1 Computer-Designed, CNC-Cut Precision

This enclosure is computer-designed using acoustic modeling software and CNC-cut (Computer Numerical Control) for absolute dimensional accuracy. Unlike hand-built boxes with tolerances measured in fractions of inches, CNC machining achieves tolerances within ±0.005 inches — ensuring perfect baffle alignment, zero air leaks, and consistent acoustic performance. Every panel, rabbet joint, and mounting cutout is machined to exact specifications for repeatable sonic excellence.

CNC precision eliminates the variability and acoustic compromises inherent in hand-cut enclosures — critical for sealed box designs where even minor air leaks destroy low-frequency response.

2 Optimized 1.1 ft³ Sealed Airspace

The 1.1 cubic foot net internal volume is meticulously calculated to complement the Audiomobile Encore 4412's Thiele-Small parameters. The Encore 4412's recommended sealed range is 0.7-1.25 ft³, and this enclosure's 1.1 ft³ volume lands perfectly in the sweet spot — delivering extended low-frequency extension with controlled, tight transient response. Too small and bass becomes anemic; too large and transients become sloppy. This precise tuning maximizes the Encore 4412's exceptional 19mm Xmax and 1000W RMS power handling.

Sealed enclosures provide the flattest frequency response, best transient accuracy, and most natural bass reproduction — preferred by audiophiles and SQ competitors for musicality over raw SPL.

3 Down-Firing Configuration Advantages

The down-firing design couples the subwoofer to the vehicle floor, using the trunk or cargo area floor as an acoustic boundary that reinforces low frequencies. This configuration delivers +3 to +6 dB of boundary reinforcement below 80 Hz — effectively increasing perceived output without additional amplifier power. The included rubber mounting feet (adding 1.25" total height) create an optimal air gap for pressure wave formation while isolating vibration transfer to the vehicle chassis.

Down-firing also protects the subwoofer cone from accidental damage during cargo loading and creates a cleaner visual appearance in visible installations.

4 3/4" MDF with Internal Bracing

Constructed from 3/4-inch Medium Density Fiberboard (MDF) — the gold standard for subwoofer enclosures due to its acoustic inertness, dimensional stability, and superior damping properties compared to plywood or particle board. The enclosure features internal bracing strategically placed to prevent panel resonance and flex under high SPL conditions. Double-faced construction and flush-mounted subwoofer provision ensure airtight assembly and eliminate acoustic energy losses.

MDF's uniform density (typically 45-50 lbs/ft³) provides consistent acoustic properties throughout the enclosure, unlike plywood's variable grain structure that creates resonant nodes.

5 Low-Profile Design for Space Efficiency

At just 7.5 inches tall (8.75" with rubber feet installed), this enclosure fits under most rear seats, behind seats in crew cabs, or in shallow trunk spaces where traditional 12" boxes cannot. The 27" W × 15" D footprint maximizes airspace efficiency while preserving precious cargo room. Perfect for vehicles with limited vertical clearance or owners who refuse to sacrifice trunk functionality for bass performance.

The Encore 4412's 4.9" mounting depth enables this ultra-low profile — achieving full 12" subwoofer output from a package smaller than most 10" shallow-mount solutions.

6 Dual Terminal Cup Configuration

The integrated dual terminal cup provides secure, professional speaker wire connection using standard spade terminals or banana plugs. The terminal cup is recessed into the enclosure's rear panel, protecting connections from accidental disconnection and maintaining a clean, finished appearance. The terminal cup location allows easy wire routing regardless of installation position while maintaining weatherproof integrity for in-vehicle use.

Recessed terminal cups prevent wire damage from cargo and eliminate protruding connectors that can snag or break during daily use.

Transient Response: The Difference Between Boom and Articulation

Sealed enclosures provide superior transient response compared to ported designs because the air spring inside the box acts as a natural acoustic damper, controlling cone motion precisely. Ported boxes suffer from group delay — the port's resonance causes bass notes to "hang" longer than they should, creating the boomy, one-note bass that fatigues listeners. Sealed designs deliver tight, controlled bass where you hear individual bass guitar notes, kick drum attacks, and synthesizer sweeps as distinct articulations rather than muddy rumble. This is why studio monitors universally use sealed designs.

Frequency Response: Flat is Fast

Sealed enclosures exhibit a smooth, predictable frequency response with gentle 12 dB/octave rolloff below resonance. Ported boxes create a sharp peak at the port tuning frequency (typically 30-35 Hz) with rapid 24 dB/octave rolloff below tuning — resulting in exaggerated mid-bass and anemic deep bass. The Encore 4412 in this 1.1 ft³ sealed box delivers flat response from 28-200 Hz, ensuring accurate reproduction of all bass frequencies from organ pedal notes (16 Hz fundamentals with 32 Hz second harmonics) through midbass guitars and male vocals (80-200 Hz) without artificial coloration.

Power Handling: Controlled Excursion Prevents Damage

The air spring in sealed enclosures acts as a mechanical limiter, preventing over-excursion that destroys subwoofers. Below the port tuning frequency, ported subwoofers lose acoustic loading and can exceed Xmax limits catastrophically — this is why ported subs require subsonic filters to survive. Sealed designs naturally protect the driver through acoustic suspension, allowing the Encore 4412's 1000W RMS power handling to be fully utilized without risk of mechanical failure. The result: higher continuous SPL capability and longer subwoofer lifespan.

1.1 ft³ Sweet Spot: Extended Low End with Control

The Encore 4412's recommended sealed range spans 0.7-1.25 ft³, and this enclosure's 1.1 ft³ volume lands perfectly in the optimal zone. At 0.7 ft³ (minimum), system Qtc rises to ~0.9, creating a peaked response with reduced low-frequency extension — bass sounds punchy but lacks depth. At 1.25 ft³ (maximum), Qtc drops to ~0.6, extending deep bass but reducing efficiency and creating sluggish transients. The 1.1 ft³ middle ground achieves Qtc ~0.707 (Butterworth alignment) — the textbook ideal that balances extended low-frequency response with tight transient control and maximum efficiency. This is the alignment preferred by acoustic engineers for music reproduction.

🎯 Audiomobile Encore 4412: Compact Powerhouse

💡 Complete System Solution: This enclosure + Encore 4412 subwoofer creates a turnkey bass system that delivers reference-grade low-frequency performance from a package that fits where conventional 12" systems cannot. The precision-engineered pairing ensures you extract every decibel of the Encore 4412's potential while maintaining the tight, controlled bass reproduction that defines audiophile sound quality.

⚠️ NOTE: Subwoofer sold separately — This listing is for the enclosure only. The Audiomobile Encore 4412 12" subwoofer is available separately and must be purchased to complete the system.