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Variants
Rockford Fosgate Power T1S1-12 12-inch T1 Slim Single 1-Ohm Subwoofer delivers surprisingly powerful, high-quality bass for a shallow-mount design; reviewers praise its output, especially when paired with strong amplifiers.
Buyer confidence
88%Highlights
- 1 Year Warranty
- Injection molded foam surround with VAST™
- Dual Nomex progressive spiders with stitched tinsel leads
- Diecast aluminum frame with integrated heat sink fins
Key specs
Full specs- Size
- 12"
- Fs (Hz)
- 36
- Subwoofer Type
- Shallow
- Speaker Connector
- 10 AWG slot loaded
- Nominal Impedance
- 1-Ohm
- Sd (cm2)
- 560
- Vas (Liters)
- 32.4
- Re (Ohms)
- 0.9
Key specs
Full specs- Size
- 12"
- Fs (Hz)
- 36
- Subwoofer Type
- Shallow
- Speaker Connector
- 10 AWG slot loaded
Highlights
Overview- 1 Year Warranty
- Injection molded foam surround with VAST™
- Dual Nomex progressive spiders with stitched tinsel leads
Review highlights
Based on customer reviewsBig, hard-hitting bass from a shallow 12-inch sub
Rockford Fosgate Power T1S1-12 12-inch T1 Slim Single 1-Ohm Subwoofer delivers surprisingly powerful, high-quality bass for a shallow-mount design; reviewers praise its output, especially when paired with strong amplifiers.
What buyers praise
- Surprisingly powerful for a shallow-mount 12-inch sub
- Deep, hard-hitting bass
What to watch for
- Premium price noted by multiple reviewers
Overview
Slim 12" subwoofer engineered to deliver low-frequency performance in shallow or space-constrained installations. Features a single 1‑ohm voice coil and design elements intended to mimic traditional Power T1 performance in a reduced depth package.
Best for
- Installations with limited mounting depth or tight spaces
- Vehicles where a standard-depth 12" subwoofer won’t fit
- Buyers who need a single, 1‑ohm subwoofer for simplified wiring options
- Applications wanting a slim option that approaches traditional T1 performance
Key points
- Slimline 12" design: reduced mounting depth for space-limited installs
- Single 1‑ohm voice coil: simplifies wiring configurations
- Dual spiders with asymmetric aligned 2-spider design to support extended low-end excursion
- Engineered slotted voice coil assembly for long excursion travel
- Available in sealed and ported options to match enclosure preferences
- Verified and engineered techs listed: CEA-2031, SYMS, EVCC, Klippel Verified, anodized aluminum voice coil former, stitched tinsel leads, VAST surround, inductive damping heat sink
Fit and use
Designed for shallow-depth installations where a traditional 12" subwoofer won’t fit. Available in sealed and ported options; sold individually (1 each). Check enclosure type (sealed vs. ported) to match your desired bass response and vehicle space constraints.
What to know
This subwoofer uses a single 1‑ohm voice coil, which affects wiring and amplifier load—verify amplifier compatibility with a 1‑ohm load before purchase. The T1S1-12 is intended to provide similar low-frequency characteristics to traditional Power T1 models through a specialized slotted voice coil and dual-spider desig…
Highlights
Key features
- 1 Year Warranty
- Injection molded foam surround with VAST™
- Dual Nomex progressive spiders with stitched tinsel leads
- Diecast aluminum frame with integrated heat sink fins
- Custom 10 AWG slot loaded brass push spring terminals with corrosion resistant tin plating
- Optimized for sealed enclosures
- Detachable die cast aluminum trim ring
- Vented pole piece
- Linear Carbon Fiber/PMI/Glass Fiber cone with aluminum dustcap
- High temp, high energy Neodymium motor structure
- Optional protective grille insert available
- Dual wound 2.5" CCA voice coil with interior/exterior windings
More info
Manufacturer details
The Power T1S1-12 is a slimline 12" subwoofer designed for spaces where traditional sized woofers will not fit. Features a single 1-ohm voice coil for simplified wiring configurations. Sold individually (1 each).
Dual Spiders – The voice coil carrier features a asymmetric aligned 2-spider design to deliver enhanced bass response. Each spider works together to handle a range of low-end notes, ensuring you never miss any bass hits in your music.
Perfect Fit – Available in multiple options, including sealed and ported options, these subwoofers make it easy to find the perfect fit for any installation, no matter the space.
Additional details
Need bass but don't have a lot of space? How about more power handling than your average shallow subwoofer? Well, the T1 "Slimline" subwoofers are not your average shallow, in fact, they have been painstakingly designed to near exact performance characteristics of traditional sized Power T1 subwoofers you're already familiar with.
We're calling these "slim" subwoofers because they don't take a lot of depth and offer bass response similar to a traditional sized model. How can this be true? Well, let's just say the Wizards-of-Fos engineered an ingenious slotted voice coil assembly that exhibits long excursion travel. Don't worry, you don't need to understand how it works, you just have to listen to how awesome they sound!
Technologies
CEA-2031
Power handling on Rockford Fosgate speakers conform to CEA-2031 industry standards. This means your speaker has
Patent: 9,008,348
SYMS
The unique motor structure design allows full excursion capabilities of the woofers voice coil while allowing ...
Patent: 9,025,809
EVCC
Our EVCC (Encapsulated Voice Coil Coupling) technology connects to the woofers voice coil from both the ...
Klippel Verified
To adorn the ‘Verified with Klippel’ mark, the qualifying company’s loudspeaker engineering personnel must be
Anodized Aluminum Voice Coil Former
Two things generally happen when voice coils heat-up. They can generate heat close to the melt-down temp of their
Stitched Tinsel Leads
Multipoint "periodic" stitched lead wire technique reduces the mass of each tinsel lead and spreads stress and
Patent: Patent Pending
VAST Surround - Subs
Rockford Fosgate's proprietary surround technique, VAST, provides up to a 25% increase in the speakers effective
Inductive Damping Heat Sink
Secures directly to the top of magnet structure to improve system efficiency by reducing both distortion and back
FlexFit Basket - Subwoofer
The slot mounted frame pattern of the FlexFit basket utilizes slots (where feasible) instead of single screw sized
Specs
Specifications
25
| Size | 12" |
| Fs (Hz) | 36 |
| Subwoofer Type | Shallow |
| Speaker Connector | 10 AWG slot loaded |
| Nominal Impedance | 1-Ohm |
| Sd (cm2) | 560 |
| Vas (Liters) | 32.4 |
| Re (Ohms) | 0.9 |
| Qms | 11.22 |
| Qts | 1.06 |
| Qes | 1.17 |
| Voice Coil Diameter | 2.98" (75 mm) |
| Voice Coil Type | Single Voice Coil |
| SPL (dB @ 2.8v/1m) | 88 |
| Le (mH) | 0.31 |
| SPL (dB @ 1w/1m) | 85 |
| Magnet Weight (oz) | 14.42 oz. (0.41 Kg) |
| Power Handling (Watts RMS) | 600 Watts RMS 1200 Watts Max |
| Cutout Diameter | 11.22 in. (285 mm) |
| Xmax (mm) | 15 |
| Mounting Depth | 3.01 in. (76.5 mm) |
| Shipping Weight | 16.15 Lbs. (7.3 Kg.) |
| Woofer Displacement | 0.042 cu. ft. (1.2 Liters) |
| Sealed Box Volume (Vb) | 1.1 cu. ft. (31.1 Liters) |
| Vented Box Volume (Vb) | 2.0 cu. ft. (56.6 Liters) |
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Installation resources
Wiring diagrams
7
Wiring Diagram #1
Source: Rockford Fosgate
Wiring Diagram #2
Source: Rockford Fosgate
Wiring Diagram #3
Source: Rockford Fosgate
Wiring Diagram #4
Source: Rockford Fosgate
Wiring Diagram #5
Source: Rockford Fosgate
Wiring Diagram #6
Source: Rockford Fosgate
Wiring Diagram #7
Source: Rockford Fosgate
Box Advisor
Sealed Enclosure
- Recommended volume
- 1.1 cu ft
- Volume range
- 0.75 cu ft to 1.25 cu ft
- Dimensions
- 22 in W x 13 in H x 9.5 in D
- F3
- 39.9 Hz
- Qtc
- 1.18
- Port / ID
- 19 in
- Subwoofer size
- 19 in
- Impedance
- 8 ohm
- Power handling (RMS)
- 600 W
Vented Enclosure
- Recommended volume
- 2 cu ft
- Volume range
- 1.75 cu ft to 2.25 cu ft
- Dimensions
- 22.5 in W x 14.5 in H x 14.25 in D
- F3
- 28 Hz
- Tuning (Fb)
- 35 Hz
- Port / ID
- 19 in
- Subwoofer size
- 19 in
- Impedance
- 8 ohm
- Power handling (RMS)
- 600 W
Support
Return Authorization
If you bought this product from Onkar Electronics, use the Contact Us page on the Onkar Electronics website and we will help with return authorization and warranty support. If you purchased it from another dealer, contact that authorized dealer first for return assistance.
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