| 12" Sonotube Subwoofer
was my first effort in speakerbuilding and I felt I could improve on the
design. I decided on a passive radiator design to maximize low frequency
response. Since it was for the Home Theater I wanted the most rumble
and house shaking I could get. On the other hand I didn't want to make
too many sacrifices in the accuracy of the response. A full size
cabinet with a passive radiator seemed the best compromise.
I'd already obtained a subwoofer and a plate amp for my sonosub project,
the design was simplified to sizing the cabinet for the woofer and the
passive radiator. I bought a 15" passive radiator from Adire Audio. I decided that size was no object in my
pursuit for low frequency. With a 8.235 Ft^3 cabinet the box
tuning frequency is17.88 Hz. Here's a plot of the predicted frequency response. Once again I
used WinISD to model the
cabinet using a ACI SV-12 driver. ACI doesn't seem to sell
drivers anymore, having concentrated on conplete speaker systems, so
future designs will not include the same driver. Here's the outside dimensions of the cabinet and a layout of the panels needed
from a 4'x8' sheet of 3/4" MDF.
Since my amplifier only has a Dolby Digital 5.1 output I also needed an
amplifier. ACI had a package deal so I got a PSA-1 amplifier with the speaker.
fairly happy with this design. It's much cleaner than any commercial
subwoofer in this price range (about $400). Its so clean that its
deceiving how loud it is.
really like to build another subwoofer so I have a pair on each side of
the TV. I'm looking at the Adire Audio Shiva Mk III for the driver.
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