Bio 8 Inch D2 (250W RMS)

$59.99 Regular price $74.99 Sale price


The Bio series, known as Badass, is our entry-level, no-frills, workhorse subwoofer. The drivers share high-grade components, perfect for the bass head on a budget. It has 250 watts RMS and 500 watts MAX power. It features a 4-layer copper Dual 2 Ohm voice coil and a polypropylene cone. It is CT’s most affordable series while still delivering excellent performance and deep low notes. The Bio is the perfect choice for its price and will not disappoint. You will stand out loud, and your friends will notice.



Technical Specifications:

  1. Sub power: 250W (RMS) | 500W (MAX) 
  2. Subwoofer size: 8"
  3. Subwoofer type/ impedance: Dual 2 ohm
  4. Voice coil (dia): 2" (51mm)
  5. Magnet Type: Y30 ferrite magnet
  6. BL: 13.724
  7. FS: 44.956Hz
  8. QTS: 0.408
  9. QES: 0.426
  10. QMS: 9.601
  11. VAS: 9.587 liters
  12. SPL: 85 dB (@1w/1m)
  13. Xmax: 14.2mm (Peak to peak)

Box Specifications:

  1. Sealed: 0.3 ft3
  2. Ported: 0.40 ~ 0.75 ft3

Mounting / Installation Parameters:

  1. Cutout diameter: 183mm / 7.2"
  2. Overall diameter: 213mm / 8.4"
  3. Mounting depth: 114mm / 4.5"


Product Manual



Subwoofer Wiring Calculator
Subwoofer Quantity     
Voice Coil Impedance  

Customer Reviews

Based on 3 reviews
Bio 8 2ohm

For the cheaper sub they make you can't go wrong. These little things pound. Have 4 in my truck in a ported box and they definitely do their job. Dont mind the dirty truck in the video 😂

8" bio subs

These subs are sweet have them in a boxed tuned to 32hz and just 2 8s on 1000w amp move quite a bit of air and hit the lows 10x better than expected

Awesome subs

Very great quality bass at a great price.