It shows that impedance peaksĬan be substantially reduced by using a filling material, but not by introducing a lossy vent.ĭate: Friday, 14 March 2008, at 7:30 p.m. It is claimed by some that this type of anĮnclosure produces a flatter impedance curve than a closed or vented-box, but modeling does not support this claim. To make doubly sure that the vent provides no output, it is resistively loaded as well. The aperiodically damped enclosure is just a vented-box with the vent resonance frequency set too low to provide any useful low frequency reinforcement. Back when I was a subscriber to Speaker Builder magazine. Here is what Professor Bullock wrote to me many years ago on the subject. I have the original DYNAUDIO spec sheet for their VARIOVENT, they make no mention of woofer or woofer Qts, only enclosure volume and stuffing. #Unibox enclosures driversI'm sure you can use drivers with a lower Qts. But an additional, and perhaps more significant advantage is the benefit of better bass resolution around system resonsnce.ĭate: Friday, 14 March 2008, at 6:44 p.m. One possibility: choose the volume where the target Q is met when the box loss provides the lowest impedance maxima.ĭone properly, the trade off is less low end extension for a smaller enclosure. > combination of cone control and bass forĭate: Friday, 14 March 2008, at 6:00 p.m.Ĭertainly I'm no expert on aperiodically damped boxes, but I will suggest that The enclosure volume can be any realistic volume, with smaller than the optimum sealed size gaining the most benefit. > up with an f3 of about 48Hz and very good > wooden cover for the rear to dress the vent > of the hole with black canvas fabric to hold > the amount of fiberglass until I got the > installed fiberglass in the hole and varied > The approach I took was to build a box equal > Not a lot of info on this type of enclosure. This is something I've been curious about. Doesn't seem to be a very powerful magnet, in any case (further measurements needed to verify this).ĭate: Friday, 14 March 2008, at 5:00 p.m. #Unibox enclosures driverI'm pretty sure this driver was used in a sealed box. Vintage drivers were notorious for having large Vas values. I'll measure the Vas of the driver and go from there. Not to mention timely (I have a strange project up my sleeve currently where I was considering aperiodic)ĭate: Friday, 14 March 2008, at 4:59 p.m. In Response To: Re: Curious: how does one design an aperiodic encl (dthomas) If you can't measure the impedance peak you vary the amount fiberglass until you have the best combination of cone control and bass for your application.ĭave Re: Wow, that was excellent, thank youĭate: Friday, 14 March 2008, at 4:47 p.m. I ended up with an f3 of about 48Hz and very good woofer control. I cut a circular wooden cover for the rear to dress the vent up.Īll in all it worked out very well. I covered each side of the hole with black canvas fabric to hold the fiberglass in the hole. All I did was drill a hole 2.5" hole in the rear of the cabinet I installed fiberglass in the hole and varied the amount of fiberglass until I got the smallest impedance peak. I put it in a 10L box with a 2.5" homemade vent. The approach I took was to build a box equal to 1/3 Vas. Or a driver designed to work well in a sealed box. Not a lot of info on this type of enclosure. >, but how does one size the enclosure in the > by attempting to minimize the impedance peak > resistance is best determined experimentally > I'd like to investigate a simple aperiodic > that doesn't provide the desired low end , > I'll probably try open baffle first,but if > need to re-measure though) and was wondering > co-ax(Fs around 30 Hz, Qts around 0.5. In Response To: Curious: how does one design an aperiodic enclosur (zobsky) Re: Curious: how does one design an aperiodic enclĭate: Friday, 14 March 2008, at 3:07 p.m. From what I understand, the vent resistance is best determined experimentally by attempting to minimize the impedance peak, but how does one size the enclosure in the first place? I'll probably try open baffle first,but if that doesn't provide the desired low end, I'd like to investigate a simple aperiodic design. need to re-measure though) and was wondering if aperiodic would work. I have an old pair of vintage 12" co-ax(Fs around 30 Hz, Qts around 0.5. Curious: how does one design an aperiodic enclosurĭate: Friday, 14 March 2008, at 2:53 p.m.
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