![]() The larger building allowed for expanding product lines, more space for keeping stock and custom items available and also allowed the company to hire on even more employees. This new and much larger facility afforded the company many new opportunities. This time they purchased a 50,000 square foot facility in Brookfield, Wisconsin. The businesses rapid expansion continued and in 1992 the business once again had to upgrade to a larger location. This time to a 22,000 square foot facility in Milwaukee and hired on an additional 9 employees bringing them up to 15. By 1988 the business was flourishing and once more ABC Box had to move to a larger location. In this time frame they also hired 3 more employees. Again, 6 months later, they outgrew their location and had to expand to 5,000 square feet. Quickly expanding, the company outgrew the garage and moved to a 1,300 square foot location in Milwaukee. ABC Box was established in January 1986 in a garage in Greendale, Wisconsin with just 3 employees. Together they have both been in the corrugated industry for over 45 years. is a family owned business that was established by Harry and Tamara Frey. Here are a few pics of some I've done over the years.ABC Box Co., Inc. ![]() Send me an email to bart (myusername).com if you are interested, and I can help you with a design. I've built dozens of them, including 4x and 8x configurations using the TB 6. It can be quite tricky to get all of the ports into the box, depending upon the driver configuration being used. The trick in a DCTV (it's actually tri-vented, not tri-tuned) lies in the enclosure design. I think we metered the 4圆 at around 141 25Hz in a BMW 328i. They already have pretty good LFE (F3 of around 37Hz) and a high Xmax for their size (13mm), and I can tell you from experience that they are extremely impressive in a DCTV. Your woofer already has plenty of excursion, so the end result of building a DCTV box for it would be both massive output in the upper bass register and some serious low end. The advantage they give is that they allow you to get the gain of a high Fb without sacrificing all of the LFE you would get from a lower Fb, and minimize LF excursion, allowing you to get more out of the woofer. Provided you have the airspace, a DCTV box might be a very good fit for your woofer, actually. But you do calculate port length based on the area of 2 ports. You build the primary chamber to 2/3 and the secondary to 1/3 of the modelled Vb, rather than building the primary to Vb and the secondary to 1/2 Vb. They're not that difficult to do from a theoretical standpoint, although the procedure listed here was a bit off, if my memory serves me correctly. I learned about it at Installer Institute back in '94, and I've seen details of it published in an old Radio Shack speaker design book circa the late 80's if I remember correctly. It's been around for a couple of decades. I'll also note that the 15" RE XXX sub in particular is a very "stubborn" sub when it comes to anything that's not a sealed box, and requires carefull massaging of the design to not end up with a one note wonder, not something I'd want to chuck in a "rules of thumb" design.Īctually, this enclosure design was not invented by whomever it was over at Term-Pro. Given the volume these enclosures require and the "rule of thumb" inability to model what you may end up with I'd much rather use a 1/4 wave TL/Horn in the same volume or a conventional ported/bandpass in a smaller package where you can at least model what you're going to get. Click to expand.I must admit that I have only investigated ABC enclosures from a theoretical perspective, but they remind me a lot of how Transmission lines and horns were similarily designed mainly with rules of thumb untill computer models were worked out for them a few years ago.Īnd it's only when you design and construct a few enclosures using the new models that you realise how limited the rules of thumb actually were and the extremely low number of applications where the rules of thumb were even in the same ballpark.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |