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The main idea behind this build was to test and see if using an Aperiodic Bi-Chamber box would work well for bookshelf speakers. I had used the design a couple times for subwoofer enclosure but never for full range speakers. Here is a website that explains a little more detail about ABC boxes http://www.diysubwoofers.org/prt/dual_chamber.htm
I have a set of Elemental Design e3.65i component speakers that were collecting dust so I decided to put them to use. I know ABC box is more designed for subs but WinISD was suggesting a ported box with a volume of 1cf tuned to 38 Hz with an F3 of 33 Hz. So with that low of tuning I wanted to see what the output will be like having two tuning frequencies and if it has the same positive results as the sub boxes I have built in the past.
Now the design, it is a 1.2 cf ABC ported box with the large chamber tuned to 33 Hz and the smaller chamber tuned to 48 Hz. The box is 10" X 18" X 16" and has a front facing and rear facing port. All the edges are rabbit and dado rabbit on the inside.
For now I left the boxes unfinished until the weather is a little nicer here in Iowa. First impressions are WOW, the speakers have a 92 db sensitivity so it does not take much to get them going but the low end output from a 6 1/2 inch speaker is crazy. I filled both boxes with polyfil but I think I am going to remove the polyfil and just use a thick piece of cotton insulation because the mid bass is being choked off. The crossover has a -3 db switch for the tweeter that I am going to use to soften the highs. But other then that, these are amazing. If I have some free time I would like to build the same box 1.2 cf box but have it be a plain ported box and see what the possible differences would be but for now I am very happy with the ABC bookshelves.
I have a set of Elemental Design e3.65i component speakers that were collecting dust so I decided to put them to use. I know ABC box is more designed for subs but WinISD was suggesting a ported box with a volume of 1cf tuned to 38 Hz with an F3 of 33 Hz. So with that low of tuning I wanted to see what the output will be like having two tuning frequencies and if it has the same positive results as the sub boxes I have built in the past.
Now the design, it is a 1.2 cf ABC ported box with the large chamber tuned to 33 Hz and the smaller chamber tuned to 48 Hz. The box is 10" X 18" X 16" and has a front facing and rear facing port. All the edges are rabbit and dado rabbit on the inside.
For now I left the boxes unfinished until the weather is a little nicer here in Iowa. First impressions are WOW, the speakers have a 92 db sensitivity so it does not take much to get them going but the low end output from a 6 1/2 inch speaker is crazy. I filled both boxes with polyfil but I think I am going to remove the polyfil and just use a thick piece of cotton insulation because the mid bass is being choked off. The crossover has a -3 db switch for the tweeter that I am going to use to soften the highs. But other then that, these are amazing. If I have some free time I would like to build the same box 1.2 cf box but have it be a plain ported box and see what the possible differences would be but for now I am very happy with the ABC bookshelves.
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