|11th February 2018, 07:55 PM||#11|
I believe Opacheco is looking for the theory behind the so-called FAST and/or WAW, using a fullrange driver with a bass driver.
I would recommend starting with xrk971's threads, but here's what I enjoy about this style-
If you have a fullrange that you like and you cross it to a woofer at about the baffle step for your enclosure, you can adjust your baffle step correction by varying the fullrange level. Easy peasy.
Easiest room and placement corrected crossover you can do.
|11th February 2018, 08:45 PM||#12|
That is a good summary of a WAW.
By relieving the FR of bass it is able to excel in the mid & top and you can have as much bass as you can afford (space & dollars). A smaller FR can be used which typically further improves mid/top performance and offers better dispersion.
If you can bi-amp you have much greater versatility, and with careful design you can get away with 1st order PLLXO filters which are both cheap & have no electronic hash added (and less information subtracted).
A passive XO presents more restrictions, one has to get the bass driver — fullrange driver sensitivities in sync. And the parts for a passive XO at the frequencies typically used (150-450 Hz) are large and can easily be pricier than a 2nd amp & PLLXO.
We have built quite a few WAW, from our original Tysen, Ellispa (name borrowed from the Sonuz Faber that inspired it), the big MTM (and a cheaper version that proceeded it), a bookshelf MTM that evolved into the floorstander Tysen V2. We have not always been successful. A little desktop WAW with an FF85wk & a TB 3” subwoofer did not produce as good or as deep bass as the FF85wk by itself in Frugel-Horn Lite. Pictures follow. And a jump off thread or 2. The most important thing to take away are the themes… there is a huge space of possible implementations.
A thread for Tysen and variations on FAST
P10-hifi Alpair 7.3eN + SDX7eN FAST
And the inside of a (elaborate) PLLXO.
And to addres sthe subject of multiple FRs in one box, i have given much thot to dealing with the issue of combing at high frequencies. A custom design i did for a fellow in Scandinavia lead to this document with possible filter options. The more i think about it, the more i like the series option, despite the signicant variations in impedance. The levels always remain the same as a single driver, but as you go down in frequency there is one driver, then 2, then 4 in the low bass. I keep thinking about a build with 4 Alpair 10PeN, but i have CHBWeN in stock and lots of tweeters to fill in at the top. As lond as the caps are chossen such that the filter point is below the quarter-wave Centre-to-centre of the drivers than everything is smooth.
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