Why Choose Crutchfield?
Great gear and expert advice
Our experts help you pick the ideal gear for your needs.Meet our advisors
Free tech support for the life of your gear.Read about our one-on-one expert help
You may return items that are complete and like new for any reason within 60 days.See the details of our return policy
Earn one point for every dollar you spend and use those points to save on future purchases.Get full details on Crutchfield Rewards
Deep discounts on car installation gear
Trusted since 1974
Our customers have trusted us with their business, and they’ve helped us win awards for our service.Check out our most recent awards
The manufacturer’s warranty always applies.See more details
Rockford Fosgate T1D415
Power T1 15" subwoofer with selectable 2- or 8-ohm impedance
Item # 575T1D415 | MFR # T1D415
This item is no longer available.
Our take on the Rockford Fosgate T1D415 by Crutchfield's Jo Greene
Rockford Fosgate engineered Power Series subs for ultimate high-power, high-volume bass. So whether you're building a system for serious competition or just to satisfy your appetite for great bass, these subs deliver colossal low-frequency reproduction that's as real as it gets.
Radial heat sink plus extended excursion for more bass
The Power Series T1D415 15" subwoofer comes equipped with a radial heat sink that's secured directly to the top of the magnet structure. This special copper heat sink radiates heat away from the voice coils, so they stay cooler for increased efficiency. It also shields the voice coils from stray magnetic energy that can impair performance. Sounds cool, but what does it mean to you? It means you get more power handling and more bass output, and that's a good thing. The sub's hefty cast aluminum frame provides a stable platform for extreme cone excursion, while an extended pole piece and bumped backplate allow the sub to hit deeper lows without "bottoming out."
Crowd-drawing bass beats
This T1 sub features a responsive paper cone that's reinforced with Kevlar® fibers (also used in bulletproof vests) — a hard anodized aluminum dust cap covers and protects the entire cone, showcasing the glossy Rockford Fosgate logo. The result is classic warm bass from a cone that's virtually indestructible. Rockford Fosgate uses a new technique to attach the oversized rubber surround to the cone that increases available cone area up to 25%, so this sub can push more air for even bigger bass.
Fuse-protected impedance selection
Rockford Fosgate's outfits Power Series subs with their unique SWIFT™ terminals, which lets you build exactly the system you want — high-power or multi-sub — without complicated wiring. Just rotate the impedance selection jumper to safely choose between 2 or 8 ohms. The jumper is also fused to protect your sub from accidental overload. If you're thinking about adding another sub down the line, this sub simplifies reconfiguring your system. These subs work equally well in a sealed or ported enclosure, so you can choose the kind of bass you want for your system.
What's in the Box:
- 15" Dual 4-ohm voice coil subwoofer
- Fused 2-ohm/8-ohm SWIFT jumper (installed)
- Non-Fused 2-ohm/8-ohm jumper
- Twelve 1-5/8" Allen head screws
- 4mm Allen head bit
- Installation/Operation manual (English/ French/ Spanish/ German)
- 15" subwoofer with with selectable 2- or 8-ohm impedance
- Kevlar® reinforced paper cone with aluminum dust cap
- Santoprene surround
- cast aluminum basket
- radial heat sink cools voice coils for higher power handling and efficiency
- metal grille included
- power range: 150-1000 watts RMS (2000 watts peak power)
- frequency response: 25-500 Hz
- sensitivity: 88 dB
- top-mount depth: 8-1/2"
- sealed box volume: 2.25 cubic feet
- ported box volume: 2.12-4.22 cubic feet
- warranty: 1 year
- Our 60-day money-back guarantee
Features and Specs
|Impedance||2 ohms or 8 ohms|
|Cone Material||Kevlar reinforced paper|
|Ideal Sealed Box Volume (cubic feet)||2.25|
|Ideal Ported Box Volume (cubic feet)||2.66|
|Port diameter (inches)||4|
|Port length (inches)||10|
|Dual Voice Coil||Yes|
88 dB at 1 watt
|Frequency Response||25 - 500 Hz|
|RMS Power Range (Watts)||150-1000|
|Peak Power Handling (Watts)||2000|
|Top Mount Depth (inches)||8 1/2|
|Bottom Mount Depth (inches)||9|
|Cutout Diameter or Length (inches)||13 15/16|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Dual 4-ohm Voice Coils: The Rockford Fosgate T1D415 subwoofer features dual 4-ohm voice coils and a jumper to easily wire them in series or parallel; the voice coils cannot be easily wired separately.
SWIFT Terminal: Rockford's proprietary SWIFT Terminal (Selectable Woofer Impedance Fused Termination) offers a simple and convenient method of selecting the impedance presented by the dual voice coil subwoofer. The impedance jumper also provides fused protection from severe overload conditions. With the jumper in the 2-ohm position the voice coils are wired in parallel; with the jumper in the 8-ohm position the voice coils are wired in series. A second, non-fused jumper is also included with the sub.
Woofer: The Kevlar fiber reinforced paper cone has a hard anodized aluminum dust cap of equivalent size; the result is a lightweight and extremely strong cone, reducing piston flex and cone distortion.
VAST Surround: The Vertical Attach Surround Technique (VAST) increases a speaker's effective radiating cone area without increasing the size of the basket. The surround is made of durable Santoprene.
Voice Coil Former: Aluminum voice coil formers offer superior heat dissipation over other commonly used materials. The hard-anodized finish increases the former strength. These two factors combine to improve the overall power handling characteristics of the subwoofer.
Cast Aluminum Basket: The basket is a die-cast aluminum design to add rigidity and eliminate multiple acoustic resonances. Additionally, the large aluminum mass helps reduce voice coil former temperature and increase power handling.
Motor Assembly: The double stacked magnet assembly, extended pole, and bumped back plate are used to create a powerful linear motor with increased excursion capability for superior bass output.
Terminals: The proprietary spring terminals will accept bare wire up to 8-gauge.
Grille: A metal grille is included to protect the subwoofer and add a finished look. If the sub is bottom mounted and the back is visible, the grille can be disassembled and just the trim ring can be installed to cover the mounting screws.
CEA-2031 Compliant: Power handling on the T1D415 subwoofer conforms to CEA-2031 industry standards. This means the subwoofer has the capacity to handle power under continuous demand, not instantaneous power handling, that over time, can damage voice coils.
FlexFit Basket: The Flex Fit frame utilizes slots (where possible) instead of single screw sized holes; allowing slight adjustment of the speaker when mounted.
Ported Box: Two ported enclosures are recommend:
- Optimum: internal volume of 2.66 cubic feet using one 4" diameter x 10" long port; this yields a tuning frequency of 32 Hz
- High Output: internal volume of 4.22 cubic feet using a 3" x 16-1/2" x 22-1/2" slot loaded port; this yields a tuning frequency of 38 Hz
Sealed Box: When using a sealed enclosure, Rockford recommends an internal volume of 2.25 cubic feet. Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.