My first Dipole Subwoofer!!!

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#207
Re: Re: Re: W Baffle Dipole Sube w/PPA15s

chops said:


You just bought those Pyles. What made you decide to replace them so soon, and why?
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The Pyles were just a proof of concept. I needed more output capability for my fairly large room. The Pyles will probably end up back in those baffles as part of the home theatre after I make some more cosmetically appealing baffles for the main system, which does reside in the living room...

Peace
 
#213
chris ma said:


The dimentions here is only for your 15" drivers right? Should I use the same H frame for 12" drivers or the H frame has to be smaller accordingly?

Thanks in advance,
Chris
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Yeah, the bigger the h-frame, the lower the frequency the drivers will be able to reproduce before cancelling out.

Even if you use the 12" drivers, you could actually build bigger baffles than mine and still sound good. It's only when you start going to smaller baffles that you sacrifice low end extention.


😉
 
#216
OK I'm real late jumpin on this thread but dang I got some ideas going now. I got Magnepan MG-IIIAs and they're dipole speakers. Id love to try a Dipole sub. I had thought about doing a single stack about 24x71" (about 6 ft high) to match the exact dimensions of a single MGIIIA.

Any pro or con of doing 2 seperate stacks or just 1 stack? I probably cant do 2 stacks the way the room is setup right now, and even 1 may be pushing it at those dimensions...
 
#217
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=292-214

This is the 10" version of the 15" Pyle Pro PPA speaker. It tests about 8Hz higher across the board on Thorsten "Ezee" Loesch's OB spreadsheet, the 15" hitting 32Hz at 80dB and the 10" hitting 40Hz at 80dB.

Oh right the baffles are the same in both tests, the ones chops used, not taking into account the sides, so they will both likely go lower.

Milo

PPS, with a baffle at 120" by 80" the 10" goes lower than the 15" in the old baffle by about 5Hz. I know, I know, its all just on paper, but its still cool.
 
#219
how high in freq do you think you can go with a H-frame? W-frame??
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You can go as high as the woofer specs allow, but:
Both the H- and W-frame develop a resonance peak. For a W-frame this is where the depth of the W-frame equals lambda/4 (in theory). Practically its ~300 Hz with a 12" driver (depth = 13,4") and ~350 Hz with a 10" driver (depth = 11"). You will have to compensate for that peak (which may easily be 10 dB and higher) with a notch filter and perhaps a Zobel filter, if you want to go higher than 80 Hz.

So the limiting factor will not be the H- or W-frame geometry, but considerations regarding the acoustic localization of the dipoles.
 
#220
This thread needed to be bumped again..

but I'll add some extras..

made in china drivers

http://madisonspeakers.netfirms.com/rawdrivers.htm

notice 2 speakers in particular:
Executioner 21 and the Knight 15

If there within 10% of spec then they should both be very good for OB use - plus the larger voice coil should reduce THD at lower freq.s, also the eff. will be substantially higher (though perhaps not as spec'ed) - build quality appears several steps up from the pyramid woofers. What you'll give up is bit more cash (for the 15 inch Knight vs. the Pyramid 15) and half an octave in extension.

This place has the 15's in stock but not the 21's.

http://www.steelsound.com/directory.cfm?CategoryID=21

Knight 15:
http://www.steelsound.com/product.cfm?ProductID=88

Executioner 21:
http://www.steelsound.com/product.cfm?ProductID=277
 
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