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Thanks GoldcountryJim

I am using wool. This Swedish thread compares different materials: http://www.faktiskt.se/modules.php?name=Forums&file=viewtopic&t=40658. Run through google translate.
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56506
Done!

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Detail.

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Raw response measured outdoors at 1 pi (floor and wall support). Quite close to the simulated response. This measurement was done before adding dampening...

56501
Dampening wool added

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Baffle mounted

56505
Trying to dampen standing wave at 300 Hz.

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Combined response.

The half wave interference at 150 hz is controlled by placing the driver in the middle of the box, at the speed maximum of the standing wave. The full wavelength standing...

I bought a pair of old SRX boxes for the drivers. So what to do with the cabinets? They are about 200 liters so they should be suitable as bass cabinets for single 2226 drivers. I did some...