What’s the difference between Dynamo IW-O and IW-S? The Dynamo IW-O uses the same retrofittable size, and dual 8” woofer configuration as the IW-S, but with an open back design instead of a sealed, fire rated enclosure. The open back of Dynamo IW-O means more sound will transfer into the wall (which could cause some noise complaints from other rooms), but with the tradeoff of deeper bass extension and higher output potential than IW-S. IW-O also has an available “High Output Back Box” accessory for when a mixture of sound control and higher output is desired.

Features

• Dual, 8” High-Excursion Carbon-Fiber-Reinforced Polypropylene woofers
• Ultra Rigid Stamped Steel chassis and baffles and die-cast aluminum clamps add
  strength and rigidity for better bass performance, and more durable installation.
  
• Magnetically attached grille: Easily reveal or hide the performance whenever you like.
  
• Premium-grade components include high-power rated resistors, capacitors and
  heavy gauge wire inductors.
  
• Optional (sold seperately) High Output Back Box available for when sound control
  is desired. **The IW-O with optional back box will require new contruction or
  drywall repair to be performed. If both sound control and retrofit sizing is required,
  take a look at the Dynamo IW-S.**
  
• Nickel-plated, spring-loaded binding posts feature a larger wire hole to accept higher-gauge wire or banana plug