I have two Pioneer 8" subwoofers (model TS-W203C 4 ohm) in a sealed enclosure. Pioneer recommends 0.5 cubic feet of airspace per subwoofer. I have them in a small sealed box with 0.9 cubic feet of shared airspace (no divider). The subs sound fine at most frequencies, but struggle when going down low and sometimes sound 'boomy'. I know this is a characteristic of such a small subwoofer, but does the box being too small contribute to this? Can I add some polyfill to the box to 'trick' the subs into performing like the box was built to specs? If so, how much do I add?

They are powered by a Total Mobile Audio T500.1 amp running at 500W x 1 into 2 ohms. (the subwoofers are wired in parallel)

I e-mailed Pioneer technical support and this is the seemingly uneducated response:

"I have two TS-W203C 8" subwoofers in a sealed enclosure sharing a common

internal volume of 0.9 cubic feet. The subs are 4 ohm wired in parallel to an amp

delivering 500W x 1 into 2 ohm (250W RMS

per sub). This particular subwoofer requires 0.5 cubic feet of volume each. That's

a total volume requirement of 1.0 cubic feet. So, my enclosure is 0.1 cubic feet

too small. Should I add

polyfill to the enclosure to 'trick' the subs into thinking the enclosure is

bigger? If so, how much do I add?"

Pioneer's response - "Thank you for contacting Pioneer Electronics, Inc.

No, that is a wrong idea about adding a insolation. It make the box volume smaller.

You may want to have a box with two chambers. The subwoofer work well in it.

Thank You,

Khammy

Customer Service Representative

Thanks for your help.

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