Zetta Audio M-8 450
8″ subwoofer · 4 Ω · 450 W RMS
The Zetta Audio M-8 450 is a 8″ subwoofer. With Qts 0.47 and EBP 78 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder.
| Source | zettaaudio.com.br · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 450 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.
Sealed
smaller, tighter| Bass character (Qtc) | Flat and accurate · 0.68 |
|---|---|
| Fc | 56 Hz |
| F3 (−3 dB, no cabin gain) | 61 Hz |
| Example box (outside) | 10 5/8″ × 10 5/8″ × 7 7/8″ |
Ported
deeper, louder| Tuning (Fb) | 49 Hz |
|---|---|
| Port | round port Ø2 1/2″, 9 3/8″ long |
| Port velocity at 450 W | 208 ft/s |
| F3 (−3 dB, no cabin gain) | 42 Hz |
| Example box (outside) | 14 3/16″ × 15 3/4″ × 6 11/16″ |
At 450 W this example’s port will be noisy: air speed 208 ft/s, while the limit is 82 ft/s. It stays quiet up to about 65 W. Full power needs a port of at least 12.7 in², which means a bigger box than this example — size it in the designer.
Open ported box in designerDeeper: 0.60 ft³ (17 L) tuned to 38 Hz, 17 9/16″ × 15 3/4″ × 6 11/16″ outside — a bigger box with flatter deep bass. Open in the calculator
Projects with this subwoofer
Boxes that users designed and published: plans, cut sheet and response graph.
Thiele/Small parameters
| Size | 8″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 450 W |
| Fs | 39 Hz |
| Qts | 0.47 |
| Qes | 0.498 |
| Qms | 8.62 |
| Vas | 0.31 ft³ |
| Re | 3.98 Ω |
|---|---|
| Sd | 31.2 in² |
| Xmax | 0.46″ |
| Vd | 14.5 in³ calc. |
| Mms | 110 g calc. |
| BL | 14.7 T·m calc. |
| EBP | 78 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 82.1 dB calc. |
Mounting dimensions
| Cutout diameter | 7 3/8″ |
|---|---|
| Mounting depth | 4 5/16″ |
| Overall diameter | 8 5/16″ |
Where it fits in a vehicle
Spots from our vehicle guides where the cutout, mounting depth and recommended box fit. The spot sizes are approximate — measure your own vehicle.
- F-150 SuperCrew — under the rear seat sealed and ported box
- F-150 regular cab — behind the seat sealed and ported box
- Ram Crew Cab — under the rear seat sealed and ported box
- Ram regular cab — behind the seat sealed and ported box
- Tacoma Double Cab — under the rear seat sealed and ported box
- Tacoma Access Cab — behind the front seats sealed and ported box
- Bronco 4-door — behind the rear seat sealed and ported box
- Wrangler 4-door, hard top — behind the rear seat sealed and ported box
- Wrangler 4-door, soft top — behind the rear seat sealed and ported box
- Silverado / Sierra Crew Cab — under the rear seat sealed and ported box
- Silverado / Sierra regular cab — behind the seat sealed and ported box
- Spare tire well sealed and ported box
- Polaris RZR / Ranger — under the seat sealed and ported box
- Can-Am — under the seat sealed and ported box
- Avalanche — under the rear seat sealed and ported box
- FJ Cruiser — behind the rear seat sealed and ported box
- El Camino 1978–87 — behind the seat sealed and ported box
- Cherokee XJ — cargo area, spare moved out sealed and ported box
- Excursion — behind the third row sealed and ported box
- Mustang 2015–2023 coupe — trunk sealed and ported box
- Challenger / Charger — trunk sealed and ported box
- Tesla Model 3 — well under the trunk floor sealed and ported box
- Club Car Precedent — under the rear seat sealed and ported box
“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.
Data sources
Other Zetta Audio 8″ models
- Zetta Audio L-8 300 8″ · 4 Ω
Similar 8″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Rockford Fosgate Punch HX2 RFD2208 0.32 ft³ sealed · 0.53 ft³ ported
- Cadence S2W8D4 0.32 ft³ sealed · 0.53 ft³ ported
- Rockford Fosgate Punch P2D2-8 0.32 ft³ sealed · 0.60 ft³ ported
- Vibe Audio Slick 8 D2 (SLICK8D2-V3) 0.28 ft³ sealed · 0.49 ft³ ported
- Sundown Audio SML-8 D2 0.32 ft³ sealed · 0.53 ft³ ported
- DD Audio 608f D2 0.34 ft³ sealed · 0.99 ft³ ported
All 8″ subwoofers in our database →
FAQ
What box does the Zetta Audio M-8 450 need?
Recommended net volume: 0.28 ft³ sealed, 0.49 ft³ ported tuned to 49 Hz — for one sub in a sedan at 450 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Zetta Audio M-8 450 Thiele/Small specs?
Fs 39 Hz, Qts 0.47, Vas 0.31 ft³, Xmax 0.46″, Sd 31.2 in².
What is the Zetta Audio M-8 450 mounting depth?
Mounting depth is 4 5/16″, cutout diameter 7 3/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Zetta Audio M-8 450 handle and how do I wire it?
RMS power rating: 450 W. Wiring for several subs and amp power — in the wiring calculator.
Is the Zetta Audio M-8 450 better sealed or ported?
EBP 78: both work — sealed 0.28 ft³ is tighter and smaller, ported 0.49 ft³ tuned to 49 Hz is deeper and louder.
What port does the Zetta Audio M-8 450 need?
For the 0.49 ft³ ported box tuned to 49 Hz: round port Ø2 1/2″, 9 3/8″ long, area 5 in². Port air speed at 450 W: 208 ft/s.
What box do two Zetta Audio M-8 450 subs need?
Two subs need twice the volume: 0.57 ft³ sealed, or 0.99 ft³ ported at the same 49 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.