My first Dipole Subwoofer!!!

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#241
Hi...

Posting some pictures of my "WW" baffle dipole sub...

8 ProAudio 12" Woofers...
An externally hosted image should be here but it was not working when we last tested it.


6 desks met their destiny 🙂
An externally hosted image should be here but it was not working when we last tested it.


Woofers mounted, a lid will be placed on top.
The Baffle will be painted black and then a nice wooden table top placed on top of everything... I'm going to use it as a living room table.
The Dipole uses a Behringer DCX 2496 pro with a crossover point at 35 Hz, 48 dB/Octave, some delay due to positioning and goes down below 20 Hz...
An externally hosted image should be here but it was not working when we last tested it.


/Stefan
 
#243
Done my first dipole subwoofers

Chops,

Thanks for the inspiration! I really enjoy the subwoofer 's enhancement to the overall sound presentation of my now biamp 2 way plus the subs. I am using the active crossing over setting the dials at 60hz and 800hz. The ouptput is so large that I have to turn down the low output and turn up the mid and high output to balance them.

Thanks,
Chris
 

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#244
Hi...

I have made an other test with a Fane Colossus 24 inch woofer...

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


Unfortunatly it's not big enough 😎 and I get distortion at large excurtions, mostly from the surround...
The sound from this baby was more tight than from the 8*12"... Probably due to the lower QTS (0.48), so the next step will be to replace the low quality 12" drivers in the 8*12 with Peerless SLS-12"...

Anyway, it was worth the try and I will probably change the enclosure to a closed box and try some heavy Eq on it (the 180 litre box is way to small for the driver...)

/Stefan
 
#248
new 12" sub

MONACOR SP300 Art.nr 60-10.0540 pris 725,00
Högtalarelement med parametrar lämpliga för transmission line "TML" , sluten låda eller "free air", mycket jämn frekvensgång.
100W, 92dB, 20-4000Hz, 8 ohm Qts 0,57, Vas 270liter, fs 25Hz, Ytterdiam/baffelhål: 305/275 mm. Vikt: 2,8 kg.

http://www.algonet.se/~minic/html/60.htm

Look under :"12 tum högtalare"

An externally hosted image should be here but it was not working when we last tested it.


http://www.monacor.dk/shop/produkt_blad.php?varenr=100540
 
#251
Re: where can i find "dipole.xls"?

Rudolf said:
Hi wingman,

dipole.xls is at
http://www.diysubwoofers.org/dipole/design.htm

but you will want to look for xlbaffle.xls too:

http://baseportal.de/cgi-bin/basepo...io/download&cmd=list&range=0,20&cmd=all&Id=15

And if you are looking for still another "best for buck" dipole woofer - how about this one:

http://www.visaton.de/english/artikel/art_645.htm

Rudolf
Click to expand...

Thanks !

I am looking for the "best for buck" dipole woofer
http://www.visaton.de/english/artikel/art_645.htm has a nice qts0,78 but fs is 37hz :bawling:
 
#252
Other good looking candidates are the MAX Pentivent 1030 and 1230 which you can read about here

More specs here.

The 1530 is very good too but quite a bit more expensive.

You can contact Nightfire for a quote (they are very competetive if you want four drivers).

And Nightfire also recommend the Italiavox 12 which is considerably cheaper than the Pentivent 1230. I would guess all these drivers are on a par with, or better than the Monacor/Visaton examples mentioned in the preceding posts. 😉
 
#253
I have skim-read the whole thread again (have read it through twice previously), looking for which T/S parameters are the most important when looking at drivers for dipole configuration.

I would guess fs, qts and xmax, as these were specified for most drivers discussed.

What values for the parameters used should I be looking for?

Im looking to build a 10"/12" prototype to start with and then possibly a 15"/18" version.
 
#257
propstuff said:

NUUK,
I have a pair of Peerless 12" XLS "in stock"
These are, (I think): fs=18; qts=0.21; xmax=buckets.

What could be done to compensate for the low qts in this case??

cheers,
N.
Click to expand...



first of all, i read it all!!!!!!

Now, about the XLS qts being .21. I remember somewhere in this thread a guy saying to "....run them through a series resistor big enough to render total Q=0.6." Sounds like something for you.
 
#258
PE Buyout 12's?

Just read the whole post (catching breath). Great stuff in there, has me finally thinking of the benefits of OB dipole subs. 🙂

Any ideas on any of these 12"s ??

Fs: 33 Hz
Qts: 0.57
Xmax: 3.5 mm

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-730

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-732

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-734


For the price I think they may work! Trying to figure out a compact way of building a sub-array with these guys. I like the idea of push-pull, and wonder if they might make good dipole candidates (again, for the price). Thinking of using 8 - 12 of them.

Thanks!
 
#260
hmm i just got a weird idea...it may have been tried before

if not, tell me how stupid it sounds just so i dont have waste money experimenting on it 😉

first off, i know how beatiful my artwork is.

ok, its kinda like the W one, but with the side closed, so the area between the two subs is closed. The front one, sub A, is wired normally, and the back one, sub B, is wired in reverse polarity, so that as A goes out, B goes in, trying to perhaps create more air than is there. or maybe i could try the same thing, but with the side still open. or maybe i could put a small port in the closed section. or i could do A in reverse polarity instead of B... well you see where the options could go...but would any of them be worth trying
 

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