Building a Sonotube Subwoofer

January 2006

My audio desires have been growing lately. I built an HTPC for my system about a year ago. Then I was fortunate enough to purchase a house that I could do what I want with (as long it pleases the wife!). I bought an Infocus SP4805 front projector and promptly graduated to an 84 inch by 48 inch Black Flame Ambient Light screen. At this point I was reasonably happy with the video side of my system. I had digital video from the HTPC for stored DVD's and component video for OTA HDTV and DIRECTV satellite. But my audio side was lacking. I owned KEF 101.2 front speakers, KEF model 90 center speaker, and KEF K140 rear surround speakers. I also owned a 10 year old Klipsch SW12 12 inch 150 watt subwoofer. Although I have liked the KEF's for years, technology and speaker building has advanced a long way in recent years. After reading various forums, asking questions on those forums, and listening to a lot of speakers, I chose to buy Ascend Acoustics 340SE left, center, & right speakers. I have never ever read or heard anything bad or negative about these speakers anywhere. With a 30 day money back guarantee, I gave them a try. All I can say is that they are incredibly accurate speakers. What goes in is what comes out. David Fabrikant (the owner & designer) has built a wonderful speaker. But I digress. That left me with needing a subwoofer that would handle today's movies and music. Current DVD's such as War of the Worlds have audio information in them as low as 3 Hz! I was all set to buy an SVS subwoofer when I found out about DIY (do it yourself) subwoofers. People have been building them for years with good results, and much less money than commercial subwoofers. I chose to build a sonotube subwoofer because of the ease of construction and the good results a lot of people are getting. Two people that I met through AVS and Htguide were instrumental in helping me design and construct this sub. Steve Callas and ThomasW made this possible for me.


Construction Pictures

Finished Pictures

Frequency Response Graphs