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A loaded enclosure is a subwoofer that comes already mounted in a box designed for it. The maker has matched the volume and tuning to the driver, so you skip the guesswork that trips up a lot of first installs. You still need an amplifier and wiring, but the result is predictable. These are the loaded enclosures we’d choose, with the power and impedance you need to match an amp.
The short version
- Best overall: Rockford Fosgate P3-1X12, 600 W RMS at 1 Ω in a vented box.
- Best value single 12: Kicker CompR 12 vented enclosure, 500 W RMS at 2 Ω.
- Best dual 12: Rockford Fosgate P3-2X12, 1,200 W RMS at 1 Ω.
- Best for single-cab trucks: Rockford Fosgate R2S-1X12, just 5.25 inches deep.
- Best budget dual: Skar SDR-2X12D4, 1,200 W RMS at 1 Ω, tuned to 32 Hz.
Our picks
Rockford Fosgate Punch P3-1X12
For a single 12 that hits hard in a sedan trunk or SUV.
- 600 W RMS, 1,200 W max
- 1 Ω final load
- Vented, 5/8″ MDF
- 15.125 × 19.125 × 15.75 in
Rockford pairs its Punch P3 12 with a vented box and wires it to 1 Ω, which lets most mono amps make their full rating. A 600–750 W at 1 Ω amp like the Rockford R2-750X1 suits it. Our P3D4-12 review covers the driver family.
- Proven Punch P3 driver
- 1 Ω load gets full power from most amps
- Rockford specs published
- Large for small trunks
- Needs a 1 Ω-stable amp
Kicker CompR 12 vented enclosure (48VCWR122)
For a solid single 12 at a 2 Ω load.
- 500 W RMS, 1,000 W peak
- 2 Ω final load
- Vented
- About 16 × 18-3/8 in, 11-1/4 to 14-7/16 in deep (retailer spec)
Kicker’s CompR in a vented box is a popular one-and-done choice. At 2 Ω, a 500 W at 2 Ω amp like the Rockford R2-500X1 is a clean match. See our CompR 12 review.
- Well-known CompR driver
- 2 Ω suits many amps
- Compact for a vented 12
- Less power handling than the P3-1X12
Rockford Fosgate Punch P3-2X12
For big output from two 12s in one box.
- 1,200 W RMS, 2,400 W max
- 1 Ω final load
- 15.125 × 33.875 × 15.75 in
Two Punch P3 12s in one enclosure at 1 Ω. Pair it with a 1,200 W at 1 Ω amp like the Rockford R2-1200X1 and 4 AWG copper wiring as a minimum.
- Matched pair
- 1 Ω load
- Rockford specs published
- Nearly 34 inches wide
- Needs serious power and wiring
Rockford Fosgate Prime R2S-1X12
For behind or under the seat of a regular-cab truck.
- 250 W RMS, 500 W max
- 2 Ω final load
- 13.5 × 27.375 in
- 5.25 in deep at the bottom, 3.25 in at the top
A shallow wedge that tucks behind a truck seat. It won’t match a vented 12 for output, but it fits where nothing else does. A 250–300 W at 2 Ω amp is plenty.
- Very shallow
- Wedge shape
- Rockford build
- 250 W RMS only
- Less deep bass than a full-size box
Skar Audio SDR-2X12D4
For a lot of output for the money.
- 1,200 W RMS, 2,400 W peak
- 1 Ω final load
- Tuned to 32 Hz
Skar tunes this dual 12 box low, at 32 Hz, for deep bass. At 1 Ω, a 1,200 W amp like the Skar RP-1200.1D matches it.
- Low tuning
- Lots of power handling
- Sold by Skar Audio
- Large and heavy
- Needs 1 Ω-stable amp and good wiring
Skar Audio SDR-1X12D2
For a budget single 12 at 1 Ω.
- 600 W RMS, 1,200 W peak
- 1 Ω final load
- 5/8″ MDF, 1.25″ double baffle
The double-thickness baffle stiffens the front panel where the sub mounts. On paper it matches the Rockford P3-1X12’s 600 W RMS at 1 Ω.
- Double baffle
- 600 W RMS
- Sold by Skar Audio
- Less brand history than Rockford or Kicker
Rockford Fosgate Prime R2-2X12
For two 12s on a moderate amp.
- 500 W RMS, 1,000 W max
- 2 Ω final load
- 14.37 × 34.06 × 12.51 in
A dual 12 that only needs 500 W at 2 Ω, so a compact amp like the R2-500X1 runs it. Good if you want the look and spread of two subs without a big electrical upgrade.
- Modest power needs
- 2 Ω load
- Shallower than the P3-2X12
- Less output than the P3-2X12
Quick comparison
| Enclosure | Subs | RMS | Load | Amp to pair |
|---|---|---|---|---|
| Rockford P3-1X12 | 1 × 12 | 600 W | 1 Ω | 600–750 W at 1 Ω |
| Kicker 48VCWR122 | 1 × 12 | 500 W | 2 Ω | 500 W at 2 Ω |
| Rockford P3-2X12 | 2 × 12 | 1,200 W | 1 Ω | 1,200 W at 1 Ω |
| Rockford R2S-1X12 | 1 × 12 | 250 W | 2 Ω | 250–300 W at 2 Ω |
| Skar SDR-2X12D4 | 2 × 12 | 1,200 W | 1 Ω | 1,200 W at 1 Ω |
| Skar SDR-1X12D2 | 1 × 12 | 600 W | 1 Ω | 600 W at 1 Ω |
| Rockford R2-2X12 | 2 × 12 | 500 W | 2 Ω | 500 W at 2 Ω |
Our amp sizing guide explains the 75–100% rule, and the wire gauge calculator sizes your power cable.
Loaded vs empty box
- Loaded: matched sub and box, one purchase, predictable results.
- Empty prefab box: cheaper if you already own a sub; see our prefab box picks.
- Powered: sub, box and amp in one. Our under-seat powered sub guide covers the compact end.
Before you buy, measure your trunk or cargo area, including the height to the parcel shelf or cover. Vented boxes in particular are larger than people expect.
Safety first: disconnect the battery’s negative terminal before you start, fuse the power wire within 18 inches of the battery, and use a professional installer if you’re not comfortable working on your car’s electrics.
FAQs
Do loaded enclosures need an amp?
Yes. Only powered subs have a built-in amp. Loaded enclosures need an external mono amp matched to their load.
Can I rewire a loaded enclosure to a different impedance?
Usually not. The terminal cup is wired for one final load, and changing it means opening the box.
Which way should a vented box face?
Try both trunk-facing and rear-facing. The car changes the sound a lot, so let your ears decide.
Sealed or vented?
Vented boxes play louder and deeper; sealed are tighter and smaller. Our sealed vs ported guide helps you choose.