TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs BIO-12 400 Watts RMS 12 Inch Car Subwoofer
Buy the BIO-12 if you want the most cone area and the lowest price: $79.99 at CT SOUNDS as of November 3, 2026, versus $99.99 for the TROPO-8. Buy the TROPO-8 if your box or mounting depth is tight, since it needs only 4.8 inches of depth and works in a sealed enclosure. Both are 400W RMS, dual 2-ohm subs from the same brand, so the choice comes down to size and fit, not power.
Today the BIO-12 400 Watts RMS 12 Inch Car Subwoofer costs $20.00 less at its best price.
Ask our shopping agent
TROPO-8 400 Watts RMS 8 Inch Car Subwoofer
4.9$99.99at CT SOUNDSObserved Nov 2, 2026, 3:13 PM
Choose the TROPO-8 if you have limited mounting depth or a small sealed box and want a compact 8-inch sub that is easy to power.
Pros
- Only 4.8 inches of mounting depth, so it fits shallow boxes and tight spaces.
- Sealed-box design keeps the build simple.
- 400W RMS with an 800W max rating.
- 4.9 out of 5 from 57 ratings.
Cons
- Costs $20 more than the BIO-12 as of November 3, 2026.
- Small 8-inch cone moves less air than a 12.
- Dual 2 ohm only, so wiring options are limited.
What separates them
| TROPO-8 400 Watts RMS 8 Inch Car Subwoofer | BIO-12 400 Watts RMS 12 Inch Car Subwoofer | |
|---|---|---|
| Price (as of November 3, 2026) | $99.99 at CT SOUNDS | $79.99 at CT SOUNDS |
| Cone size | 8 inch | 12 inch |
| RMS power handling | 400W RMS, 800W max | 400W RMS, 800W max (listing also states 650W RMS) |
| Voice coil | 2 inch, 4-layer copper | 2.4 inch, 4-layer copper |
| Mounting depth | 4.8 inches | Not stated; 12-inch drivers typically need more depth |
| Enclosure options | Sealed | Sealed or ported |
| Impedance options | Dual 2 ohm | Dual 2 ohm or dual 4 ohm |
| Cooling |
Price history
$129.99$79.99
- TROPO-8 400 Watts RMS 8 Inch Car Subwoofer: lowest $99.99 on Oct 30 at Amazon; $99.99 on Nov 2.
- BIO-12 400 Watts RMS 12 Inch Car Subwoofer: lowest $79.99 on Oct 30 at Amazon; $79.99 on Nov 2.
Prices at every store
TROPO-8 400 Watts RMS 8 Inch Car Subwoofer
- CT SOUNDSNew
In stockReturn policy
$99.99Observed Nov 2, 2026, 3:13 PM
Also available at
- AmazonCheck price at Amazon
- eBayCheck price at eBay
- CT SoundsCheck price at CT Sounds
BIO-12 400 Watts RMS 12 Inch Car Subwoofer
- CT SOUNDSNew
In stockReturn policy
$79.99Observed at 8:03 AM
Also available at
- AmazonCheck price at Amazon
- CT SoundsCheck price at CT Sounds
- eBayCheck price at eBay
Specs compared
| Spec | TROPO-8 400 Watts RMS 8 Inch Car Subwoofer | BIO-12 400 Watts RMS 12 Inch Car Subwoofer |
|---|---|---|
| Dual Voice Coil | Yes | Yes |
| Enclosure Type | Sealed | Sealed, Ported |
| Waterproof | No | — |
| RMS Output | 400 Watts | — |
| Maximum Output | 800 Watts | — |
| Channels | 2.0 (surround sound channel configuration) | — |
| Speaker Type | Subwoofer | — |
| Impedance | Dual 2 Ohm | — |
| Sensitivity | 84.7 dB | — |
| Bluetooth | No | — |
| Connectivity Type |
Questions and answers
- Which is better for a small car or a shallow box?
- The TROPO-8. Its 4.8-inch mounting depth fits where a 12-inch sub usually will not, and it runs in a sealed enclosure.
- Which hits harder?
- The BIO-12. Both are rated 400W RMS, but the 12-inch cone moves more air, so it plays louder and lower in a suitable box.
- Is the BIO-12 worth it over the TROPO-8?
- It costs less: $79.99 versus $99.99 at CT SOUNDS as of November 3, 2026. Pick it if you have the space. Pick the TROPO-8 if depth is the limit.
- Which lasts longer?
- Neither has a published durability rating. The BIO-12 has a larger 2.4-inch voice coil and an air cooling system, which helps under long, hard play.
- Can I run either on the same amplifier?
- Yes, if the amp is stable at 1 ohm or 4 ohms. Both are dual 2 ohm, so a pair wires to 2 ohms or 0.5 ohm. The BIO-12 also comes in dual 4 ohm for a 2-ohm final load with two subs.
- Do they need different boxes?
- Yes. The TROPO-8 is listed for sealed only. The BIO-12 works in sealed or ported, and CT Sounds says it is designed to pair with its pre-fabricated enclosures.
More comparisons
- BIO-10 400 Watts RMS 10 Inch Car Subwoofer vs TROPO-8 400 Watts RMS 8 Inch Car Subwoofer
- BIO-10 400 Watts RMS 10 Inch Car Subwoofer vs BIO-12 400 Watts RMS 12 Inch Car Subwoofer
- TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs HYDRO-8 300 Watts RMS 8 Inch Shallow-Mount Subwoofer
- TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs MB Quart DS2-204
- BIO-12 400 Watts RMS 12 Inch Car Subwoofer vs BIO-8 300 Watts RMS 8 Inch Car Subwoofer
- TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs Alpine R2-W8D2
- TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs RV208P
- TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs SS8P
