For example, to produce 20hz to 100hz up to 120db at 80hz, with little distortion. So when do you use this and why am I bringing it up?īecause I define a subwoofer by its ability to meet certain performance characteristics with a minimum of distortion. I see no value in using this with typical home theater subwoofer drivers of say 20mm xmax one way (or more) and 1-2000 watts power handling (or often less). As such, it provides no advantage for such drivers. Here is why that is important, if a driver has high linear xmax and modest power handling, then such drivers would not exceed their xmax before exceeding their thermal limits around and above the port tuning frequency. In fact, if the ports are linear, it would thus also provide a reduction in distortion.ĭistortion reduction and excursion control, and the distortion reduction is a direct result of the excursion control. I believe Don Keele was the first to discuss this kind of enclosure, and it’s primary purpose is excursion control. What does this complex setup do, it creates two minimum motion notches roughly one octave apart of similar Q (which can be varied by the internal damping). That means we have two chambers, a direct radiating driver, two external ports (one in each chamber) and one internal port (series loading the first chamber to the second chamber/port. Finally that second chamber has a third port of again, the same given length. Between the chambers is another port of the same given length. On the larger chamber is a port of a given length. It’s a box with a response similar to a 4th order reflex enclosure but dividing the internal volume into two chambers. It’s actually the name given by the software author for a kind of series tuned dual reflex enclosure known as an Aperiodic Bichamber enclosure. You probably thought it was a joke, some kind of placeholder for something. None the less, I’m going to describe and foreshadow a planned future project and explain a little of why.įor those familiar with Hornresp, you may have noted an enclosure option called an ABC box. I very much hope this turns into a real project to share and not just an exercise in theory and modeling.
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