I found empirically to double the speaker size going from closed box to dipole (and this to aplpy to midrange as well).
So, for instance a 6" in a box => 12" in dipole. This iss my case and I feel my woofers to behave this way (and to lack the lower end likewise).
lol, sorry about that.
Yes, When I was a kid in school I had those big 12" woofers in my main speakers for rock n' roll, I grew out of that, got married, WAF stuff and I went to the slim 6 - 8" drivers...I felt like I lost my man hood for years, of course I drive a minivan (2 toddlers) so I lost that man card completely
We biult a new house 3 years ago so I was able to put an IB array and I have a custom HT room for all my testing/building spekers. I was able to get back to those 12-15" woofers. Im really not sure why I went 12" instead of 15" though.
That's the same as making the cone area 4 times larger - doesn't seem to be too far off to me. It depends on your baffle size as well of course.
This is the best idea. You can get super clean bass and tons of it while at the same time every driver is moving only .5mm.
It's just wildly impractical for most people. It depends on how bad you want the goods, I guess.
The right T/S params for a moderatly eff., fairly low freq. sealed enclosure design that doesn't require a large enclosure volume. Others have also used the words "punchy" to describe it.
Agree.
And here is one I like...beyma SM 110 N
Beyma SM Series Speakers - Beyma SM Series SM-110N speaker - Beyma SM-110N 400 watt 10" woofer for all bass applications. Beyma SM-110N and other Beyma 10" speakers here.
Best, Jernej
The SM-112/N is also a very good unit (down up to about 70hz, lower and the distortion is too much like most woofers). Extended midrange, can be crossed very high if you like.
would the slam compare to sealed woofers? in your experience Stig how many OB woofers equal the impact of a given number of sealed woofers? (hope this question makes sense)
wouldn't it be cleaver to go OB down to the lowest room-mode and then sealed?
"Slam" is very subjective.... some think that only bass-reflex have "slam", some think that only dipoles can have it... if you mean clean transient attach, then OB is what I think is best.
I would at least quadruple the cone area when going from sealed box to OB. It will depend on the baffle size of course.
Possibly.....
Roughly quarter wavelenght, if the baffle height is much larger than the width.
340 / 500 / 4 = 0,17 meters
In a square baffle, approx half wavelength:
340 / 500 / 2 = 0,34 meters
You can simulate this with EDGE.
Home of the Edge
340 / 500 / 4 = 0,17 meters
In a square baffle, approx half wavelength:
340 / 500 / 2 = 0,34 meters
You can simulate this with EDGE.
Home of the Edge
Discovered it today (...)
Cheers
I tried EDGE, and if I have understood it right it shows that baffle step starts at aprox 300hz with a 24x95 cm baffle. I guess I will have to go with a more narrow baffle and smaller woofers to get the ** frequency up to around 500hz, which is where they will be crossed over to the mid/tweeter.Attachments
Guess you should be looking into something like this then.... nice speaker by the way.
An externally hosted image should be here but it was not working when we last tested it.
Cool, we are building similar designs using a waveguide in the middle.
The "REECARRAY" build! - AVS Forum
What does that ribbon have for a vertical response? I didnt think that would work to well in an array of woofers.
The "REECARRAY" build! - AVS Forum
What does that ribbon have for a vertical response? I didnt think that would work to well in an array of woofers.
My experience
I think the real difference between a single large woofer and multiple smaller ones is in the coupling to the air.
The thing I noticed from going from an 8" sealed woofer to 12 12" (and 8 8") open baffle woofers was the way how much more dynamic and tight/clean bass became, not how deep the bass sounded.
So, my belief is that the lower the frequency, the better it is to have a larger surface area unless the only requirement is low frequency. All else is a compromise on tight/clean bass.
I think the real difference between a single large woofer and multiple smaller ones is in the coupling to the air.
The thing I noticed from going from an 8" sealed woofer to 12 12" (and 8 8") open baffle woofers was the way how much more dynamic and tight/clean bass became, not how deep the bass sounded.
So, my belief is that the lower the frequency, the better it is to have a larger surface area unless the only requirement is low frequency. All else is a compromise on tight/clean bass.
Twelwe 12" ! Any pics or description of that system?
An externally hosted image should be here but it was not working when we last tested it.
Obvious enough?
Max power 4x 2000 watt at 2 ohm per channel (2x Behringer EP4000 in stereo driving 3 woofers in parallel) just for the subs.
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