Line array for the betsy ?
I have an idea. How about 4-6 of the betsy drivers stacked vertically in a line array?
I had a pa column using 8" full ranges early in my audio life (kustom 300 with 6 x 8" speaker, some replaced with early 1990's rat shack full range with whizzers). It was fun and very loud.
Early 1970's Kustom Tuck & Roll Products
Then I came across this a couple of weeks ago. 4 x 8" but with a ribbon.
We've been wondering if is an ob or not (on the full range forum here). It uses the 8" hemptone fr8 drivers.
6moons audio reviews: J.A.F. Bombard
I was playing with a tang band w8-1808 and doing a bit on reading what a whizzer does for response and directivity. On an 8" coral, the whizzer added real high, but it also lowered (made flatter) the freq response from 1-5khz and improved dispersion from 2-4khz. I never knew whizzer design was such an art.
My 1808 really had only enough dispersion (highs) for 2 people sitting shoulder to shoulder at 12'.
So, by adding drivers and knowing how an 8" starts narrowing directivity past 2khz, I think you could easily add a bit of dynamics, keep the intelligibility, and gain higher volumes, all for not much cost. I don't think combing filtering would hurt 8" drivers.
Whatcha think ?
I really want to try it. I know that comb filtering should be a problem, but I also swear I've seen anecdotes of it not being much of an issue. It could be that the narrow dispersion helps.
I just scanned that review. Notice the magnet, see any similarities? With the Q of a BetsyK and very little gain from that under-sized cabinet, I wonder if that speaker is an MTM with the bottom two run only as woofers. The other thing to note is that those drivers have a shorting ring, so they have much more treble from 1.5k or so on up to wherever they low pass them. That could well balance the effects of comb filtering.
I've wanted to try a line array, as I've had to tell so many folks that I didn't think it would work. Thats sad, as I could sell so many speakers in one shot! Last week my brother-in-law asked me about speakers for his classroom. I built some simple TL's for his living room, and he is very happy with them. He was thinking of something like that, but I don't think they have the dynamic capabilities and dispersion for a large music classroom.
Which brings us back to comb filtering. Those Kustom's aren't alone in appearing to ignore the conventional wisdom. I can think of all sorts of vintage speakers that should comb filtering problems but were well loved. Heck, I can think of some very expensive modern speakers that have two tweeters that look too far apart. If only I had a free weekend coming up!
Wild Burro Audio Labs - DIY Full Range Speakers
anyone want to try ?
6 (220cm2 x 6) will have more area than a 15" (856cm2), woot.
Getting a cabinet built is probably an impossibility for me.
You may need an equalizer.
I've actually built something similar, although I can't claim full credit for the design, but more info on my build can be found here.
The best DIY speaker in the world? - DIY Audio & Electronics - StereoNET Australia
They are essentially an 'open backed box' and each driver is separarted by a shelf, to stop crosstalk and to provide bracing. I'm using a very cheap full range driver, found at my local Jaycar shop
8-inch Twincone 8 Ohm PA Speaker - Jaycar Electronics
They do need help from a tweeter, and I've tried several ribbons, planars, and domes sadly, from a cost point of view, they pair very well with my RAALS, which I already had, so the RAALS are going to stay. In the pics I'm using a HiVi RT2C-A Planar Isodynamic Tweeter, which sound good, but the RAALS simply shine, and sound OH! SO! natural and so much faster. And that's the problem, these things are very fast, in a different league of fast compared to power hungry modern 'Hifi' drivers, with heavy magnets and heavy cones. They also need help in the bottom octave, and I'm using a pair of Alphas in a 'H' frame for bass support, these will need updating though as they are just a tad too slow to keep up with my FR's and RAALS, but enjoyable for now. my hunt for a great well priced high sensitivity OB 15 incher continues.
I'm running these passive, and the crossover is very simple, LR2 on the tweet and Bass, and a inductor, so 1st order on the FR's just to tame the combined rising response, crossover ponts are 3k and 170hz, but you can vary these to suit your tastes, higher or lower, you have room to explore.
So how do they sound? Well I'll say this. I've never ever been as this excited about music and HiFi in my entire audio journey, some 20+years, these speakers simply tick so many boxes for what they do well, if I couldn't build another pair of speakers, or buy something better (N.B I'd have to spend plenty) i'd happily live with these for a long long time.
Doesn't seem to be an issue for several designs
Speaker Design Works
Schumakubin pictures by pete_schumacher - Photobucket
Prisstina pictures by pete_schumacher - Photobucket
single .1uF on ribbon, 1 8" run wide open, a 1.8mH in series with 1 driver and 2 in series.
Not sure I'd call that a line array, but I've always wanted to play with a 6db (single cap) on a ribbon with a full range...........
Maybe assisted full range with supertweet and baffle step (or open baffle boost) ?
yea, this stuff is fun. Flat is boring, we like a bit of smile face if we use an equalizer. It's hard for me to find a driver that is not hot from the 1-4khz range.
Someone liked 8 x b200 in a flat array (those have a climbing response naturally).
Visaton B200 in spruce baffle
here is a 5 page thread where the owner talks about the brutal .75ohm but excellent array.
my crest will do 2ohm, and at low levels it should be fine............
Definitely some irony pairing the RAALs w/ those Jaycars. ;)
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