Yeah. All right, you primitive screwheads, listen up. See this? This is my BOOMSTICK! Its a 4″ quad woofer tower, S-Marts top-of-the-line. You can find this in the electronics department. Thats right, this sweet baby was made in Ann Arbor, Michigan. Retails for about $299.95. Its got a MDF stock, brushed aluminum and a hair trigger. Thats right. Shop Smart. Shop S-Mart. YA GOT THAT!?
The Boomsticks are a slim, high-WAF, tower design with surprising bass output given the small woofers and relatively diminutive footprint. They utilize the Dayton RS100-8 and Dayton ND25FA.
Ive always loved the look of slim lifestyle towers that you get in those home-theater-in-a-box (HTIB) systems, but they always perform terribly. If they even come with towers, the HTIB systems typically lack any real bass output, use cheap quality drivers, and plastic enclosures. This leads to localization issues with the sub having to be crossed too high, high, distortion, and resonant enclosures.
I wanted to make something that had a similar look of those towers slim and sleek with multiple drive units but performed better in all aspects. Ive always loved the look of multiple driver towers, and I think most people probably feel the same way about this. I also wanted this design to be good enough for both music without a sub and movies in a HT system with one.
For this build, I needed a small driver that could play deep in a relatively small enclosure. However, most small drivers suffer from less than stellar bass reproduction when they can reach low due to high distortion from the small cone trying to reproduce those notes. This is especially apparent as you turn up the volume. After considering a few different options, I settled on the Dayton RS100-8. I went with the 8 Ohm version over the 4 Ohm so that it would have more appeal to people building this design.
There are a number of reasons I chose this driver. First, the outside frame is just under 4 diameter, which meant I could keep the cabinet very slim. Second, the RS100-8 already has low midrange distortion, and adding 4 per side allowed me to lower that even further, reduce the excursion demands at higher outputs, and therefore lower the bass distortion as well. Four of them per side gives you roughly the same cone area as a single 7 driver. You also end up at roughly 85dB efficiency at 1 watt and roughly 85 db sensitivity at 2.83V, which is a few dB more than most 7 drivers would be at if used in a standard 2-way. Third, they have a unique set of T/S parameters, that when vented in an oversized box, actually reduces a lot of the excursion demands on the woofer (see excursion graph), again, leading to lower distortion from the small driver.
I knew I wanted a tweeter with a small faceplate to keep the look proportionate and the spacing on the drivers close. I ended up deciding to keep it all Dayton and go with the Dayton ND25FA. This tweeter met my requirements for a small faceplate, it can cross reasonably low, has very good distortion for its price, and a smooth response.