![]() ![]() ![]() Parliamentary broadcasting was commenced by Ben Chifley's government on 10 July 1946 on ABC Radio. These restrictions do not apply to the other broadcasts of Newsradio. ![]() Also broadcast, at the end of each day's sitting, is a recording of Question Time for the chamber that was not broadcast live that day. Originally called the Parliamentary and News Network (PNN), the AM/FM radio network is chartered to broadcast live the proceedings of parliament, either the House of Representatives or the Senate, as specified by the standing orders. It is available on a number of broadcasts around Australia, including AM/FM radio, some pay-TV platforms and online. #ABC BOX AUDIO DOWNLOAD#You can also download our Google Play application and listen to ABC NewsRadio on your smart phone.ĪBC News is an Australian Broadcasting Corporation 24-hour news radio service. #ABC BOX AUDIO FREE#Here are a few pics of some I've done over the years.You can also feel free to share the radio station with your friends in Facebook, Twitter and other social media. 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. #ABC BOX AUDIO DRIVER#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. ![]()
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