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BIO-12 400 Watts RMS 12 Inch Car Subwoofer vs BIO-8 300 Watts RMS 8 Inch Car Subwoofer

Buy the BIO-12 if you want real output and deep bass; it moves far more air and handles 400 watts RMS. Buy the BIO-8 if space is tight or you are replacing a factory sub in a small enclosure. The BIO-12 is $79.99 at CT SOUNDS as of November 3, 2026, and the BIO-8 has no current store price listed, only a $59.99 low since November 1, 2026.

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TROPO
BIO-12 400 Watts RMS 12 Inch Car Subwoofer

BIO-12 400 Watts RMS 12 Inch Car Subwoofer

4.8· 47 ratings
$79.99at CT SOUNDSObserved at 8:03 AM

Choose the BIO-12 if you have room for a 12-inch driver and want the most bass per dollar from a 400-watt RMS sub.

Pros
  • Big 12-inch cone gives strong low-end output.
  • 400 watts RMS leaves headroom for a 600-800 watt amp.
  • Dual 2 or dual 4 ohm wiring covers most amps.
  • Cheap for the output: $79.99 at CT SOUNDS as of November 3, 2026.
  • Works sealed or ported.
Cons
  • Needs a large box and mounting depth.
  • No published sensitivity figure.

What separates them

BIO-12 400 Watts RMS 12 Inch Car SubwooferBIO-8 300 Watts RMS 8 Inch Car Subwoofer
Driver size12 inches8 inches
RMS power handling400 watts (800 max)300 watts (600 max)
Voice coil2.4-inch, 4-layer copper2-inch, 4-layer copper
SensitivityNot published83.4 dB
Mounting depthNot published3.82 inches
Enclosure optionsSealed or portedSealed or ported (flush mount)
Impedance optionsDual 2 ohm or dual 4 ohmDual 2 ohm or dual 4 ohm
Price$79.99 at CT SOUNDS as of November 3, 2026No current store price listed; $59.99 low since November 1, 2026

Price history

$129.99$59.99
Oct 30Nov 2
  • BIO-12 400 Watts RMS 12 Inch Car Subwoofer: lowest $79.99 on Oct 30 at Amazon; $79.99 on Nov 2.
  • BIO-8 300 Watts RMS 8 Inch Car Subwoofer: lowest $59.99 on Nov 1 at CT Sounds; $59.99 on Nov 2.

Prices at every store

BIO-12 400 Watts RMS 12 Inch Car Subwoofer

  • CT SOUNDSNew

    In stockReturn policy

    $79.99Observed at 8:03 AM
    Visit store

Also available at

  • AmazonCheck price at Amazon
  • CT SoundsCheck price at CT Sounds
  • eBayCheck price at eBay
Prices and history →

BIO-8 300 Watts RMS 8 Inch Car Subwoofer

  • AmazonCheck price at Amazon
  • CT SoundsCheck price at CT Sounds
  • eBayCheck price at eBay
Prices and history →

Specs compared

SpecBIO-12 400 Watts RMS 12 Inch Car SubwooferBIO-8 300 Watts RMS 8 Inch Car Subwoofer
Dual Voice CoilYesYes
Amplification TypePassive—
Enclosure TypeSealed, Ported—
ColorChrome—
RMS Power Rating650 watts RMS—
Size12 inches diameter—
RMS power—300 Watt
Max power—600 watts
Speaker size—8"
Impedance—Dual 2 Ohm
Voice coil

Questions and answers

Which hits harder, the BIO-12 or the BIO-8?
The BIO-12. A 12-inch cone with 400 watts RMS moves noticeably more air than an 8-inch at 300 watts. The BIO-8 is punchy but will not reach the same low-end depth.
Which is better for a factory sub replacement?
The BIO-8. Its 3.82-inch mounting depth and 8-inch frame fit stock locations that a 12-inch will not. Check your cutout: 7.17 inches for the BIO-8.
Is the BIO-12 worth the extra money?
Yes if you have the space. At $79.99 at CT SOUNDS as of November 3, 2026, it costs about $20 more than the BIO-8's $59.99 low and gives 100 more watts RMS and far more cone area.
Do both work with the same amplifier?
Both come in dual 2 ohm or dual 4 ohm, so either can be wired to 1 ohm or 4 ohm. Match the amp to the RMS rating: 400 watts for the BIO-12, 300 for the BIO-8.
Which lasts longer?
Neither has a long track record. The BIO-12 has 47 ratings at 4.8; the BIO-8 has one. Both use foam surrounds, which degrade over years in heat and sun.
Can I use either in a sealed box?
Yes. Both are listed for sealed or ported enclosures. The BIO-12 needs a much larger box, so measure your trunk before buying.

More comparisons

  • 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 BIO-12 400 Watts RMS 12 Inch Car Subwoofer
  • BIO-10 400 Watts RMS 10 Inch Car Subwoofer vs BIO-8 300 Watts RMS 8 Inch Car Subwoofer
  • TROPO-8 400 Watts RMS 8 Inch Car Subwoofer vs BIO-8 300 Watts RMS 8 Inch Car Subwoofer

Buying guides that pick them

  • Best subwoofers under $100
  • Best 8-inch car subwoofers under $150
  • Best 8-inch car subwoofers
  • Only one store prices it new.
  • Price swung from $129.99 to $79.99 in days, so watch it.
    • BIO
    BIO-8 300 Watts RMS 8 Inch Car Subwoofer

    BIO-8 300 Watts RMS 8 Inch Car Subwoofer

    5· 1 rating

    Choose the BIO-8 if you need a shallow, small-box sub for a factory location or a tight trunk.

    Pros
    • Small 3.82-inch mounting depth fits tight spaces.
    • 83.4 dB sensitivity is published, so you can plan amp gain.
    • 300 watts RMS is plenty for a factory replacement.
    • Cheaper at its $59.99 low since November 1, 2026.
    • Dual 2 or dual 4 ohm options.
    Cons
    • 8-inch cone moves much less air than a 12.
    • 300 watts RMS limits how loud it goes.
    • No current store price listed.
    • Only one rating, so the 5-star score means little.
    • Foam surround wears faster in hot climates.
    —
    2-Inch - 4-Layer Copper Voice Coil
    Mounting depth—3.82”
    Show all 33 specsShow fewer specs
    SpecBIO-12 400 Watts RMS 12 Inch Car SubwooferBIO-8 300 Watts RMS 8 Inch Car Subwoofer
    Cutout diameter—7.17”
    Weight—3.5 kg
    Product dimensions—21.31 x 21.31 x 11.91 cm
    Connectivity—Wired
    Input voltage—12 volts_of_direct_current
    Model number—BIO-8-D2
    RMS Output—300 Watt
    Maximum Output—600 W
    Vehicle Type—Car
    Waterproof—No
    Speaker Type—Subwoofer
    Sensitivity—83.4 dB
    Mounting Type—Flush Mount
    Installation Type—Flush Mount
    Depth—8.39"
    Height—4.69"
    Width—8.39"
    Connectivity Type—Wired
    Control Method—Voice control
    Material—Foam (surround), Copper (voice coil), Poly-cott…
    Illuminated—No