The cabinet is built of 3/4"x12"x6' MDF shelving. Width = 8.5" Depth = 10"Driver = Audax HT210A2 Efficiency = 94dB Power Rating = 55W Fr = 55Hz Material = Unfinished Solid Pine Dimensions are all internal. The Voigt Pipe acts as a cross between a horn and a transmission-line (TL). Use the port block as a spacer between the side for alignment. One, you get too much primer around the base and port. During the tune-up, it's a good idea not to close definitely a side of the box to allow easy modification of the internal damping. I have not found a good way to do it until today. Stuffing: As you might have guessed, I used more than the standard amount of stuffing. The stuff is brittle, expensive, and itchy. Fix the speaker well into its hole now and then turn the pressure screw against the magnet with some feeling and judgment. By tapering the pipe as shown, the resonances will spread over a wide range of frequencies, thereby eliminating the 'one-bass-note samba' that can sometimes be heard in poorly designed reflex and TL enclosures. I switched to my dremel with about the same effect. The RS28A-4 1-1/8″ Aluminum Dome Tweeters are mounted in 4” PVC tubes that reduce down to a 2” curved pipe. Yet, I could not forget the coherence of the single point source and the great ability of Full range drivers to disappear completely. I'm open to suggestions here.I ended up cutting a tip off a Ziploc baggie filled with caulk and hand mashing the caulk as high up as I could reach. The triangular nature of the Voigt pipe causes its resonant frequencies to be spread across the midrange bands, and the length of the pipe accentuates the bass frequencies very well. But what they have in volumes is that immeasurable quotient of speed fun and dynamics and they do not suffer the sweet spot of many single drivers....hey you move around with these and still feel that you are having your cake and eating it too. They are good for fairly large rooms where you can spread them 8 to 10 foot apart and 3 foot away from the wall or more. The notches are caused by line harmonics cancelling the output from the drivers front. Both sets were driven by the same amp using its A/B switches. Screws are not necessary, but make sure the fit is air tight. Sorry, not for me. I think I will build another pair since I'm so pleased with these, but this time using a Lowther driver, or Lothx driver because a very light cone is very important (but they typically cost $300 each!!). First you rip the sheet to make it more managable. I adapted the design so that I could use it as a center speaker with the distinctive triangular peak that the other pipes contain. Once the contact cement has dried for the recommended 40 minutes or so just lay them out and then beginto place the sheet of veneer over the work and then pull them out one at a time. The final stuffing configuration is moderately firmly pack polyfill (simply because I tried the Miraflex® first, and there is no need to change back), from the top to 2" below the driver: Glue and screw the baffle to the sides and top. the Voigt Pipe is a Tapered Quarter Wave Pipe enclosure, which is a very old design and not very popular today becasue of its size (if built full length like this one) or the complexity of the cabinet if built as a folded horn. NOTE the 7-7/8" by 4-7/8" vent-hole is not flush with the bottom but 3/8" higher than the inner bottom! Occasionally, I hear it resonating at lower notes, which is undesirable. Surfing the inter-net for speaker projects, I looked at many but shied away from complicated vented boxes, transmission lines and crossovers with associated math. I put a 1/2" chamfer on the edges, just because. Once you experience the full range driver you will never go back to crossovers and multi-way speakers. Instead of troublesome tuning, two or more pipes can be employed in one enclosure, possibly even with different drivers. System response will be primarily determined by the respective line-length and vent resonant frequencies; the driver position being used to create destructive interference of the higher frequency stuff we don't want coming out the vent (that is, it shouldn't be at an even fraction of the acoustic length of the pipe). The bottom line is Miraflex® and polyfill are one-for-one replaceable. I had my eye (but not my wallet) on a pair of $2400, polished aluminum D2-al2's from O'heocha Design, but decided to build a simple Voigt pipe instead. I used 3/4" chipboard that I had left over from a sub-flooring job. To move the speaker to the left wall, you must specify a negative value . 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