My first Dipole Subwoofer!!!

[chops]

Pretty neat! They're the baby version of mine!!

It's amazing what cheaper drivers can do when utilized properly. I'm sure your little dipoles surprised you the first time you fired them up just like mine did.

[JoeBob]

I had a thread of mine at http://diyaudio.com/forums/showthrea...ghlight=dipole

Although they weren't inspired by chops, they do sound downright amazing...

[cowanrg]

hum... i have 2 6 1/2" radioshack drivers sitting down in my basement right now. maybe ill put them into a baffle and see how that works out. ive always been looking to replace my sub (no real problem with it, i just want more), and the commercial offerings are disappointing. the next sub im looking at costs $4K! thankfully im a dealer, so it will be much less (around $200 ). im wondering if i could do like 8 15's? just do 4 boxes like chops did and stack them

i too have maggies (1.6QR's), and i love them. i just need to fill in the bottom end.

if i was going to build a test sub with my two 6 1/2's, how do i calculate the size of the baffle, etc? was there a spreadsheet somewhere?

[Nappylady]

It's very simple: there's a -6dB shelf that starts at the frequency whose 1/2 wavelength is the *shortest* distance from the front of the speaker cone to the back.

Unless I didn't think that through right. Maybe it's 1/4 wavelength. But I think it's 1/2. Anyway. Someone will correct me, I'm sure.

[cowanrg]

Originally posted by Nappylady
It's very simple: there's a -6dB shelf that starts at the frequency whose 1/2 wavelength is the *shortest* distance from the front of the speaker cone to the back.

Unless I didn't think that through right. Maybe it's 1/4 wavelength. But I think it's 1/2. Anyway. Someone will correct me, I'm sure.

[hitsware]

http://kosat.consultit.no/~ketil/lowther/bigfunht.html

The same formulas apply to open baffles as to the mouth of a horn.........

[navin]

hi all,
having looked at linkwitz's designs on his website http://www.linkwitzlab.com/woofer.htm and http://www.linkwitzlab.com/woofer3.htm what is difference or advantage of this v/s the design shown in Another converted to dipole

[Rudolf]

Hi Navin,

1.
by folding the baffle to a W-shape, like Linkwitz does, you get a much wider virtual baffle as seen by the driver.

2.
In a W-shape baffle you can load the driver with a sort of compression chamber in the front, thereby raising Qts and lowering Fs.

[Nuuk]

I have also been puzzled by the three options, ie H baffles, W baffles and plain baffles for mounting woofers.

I can see that the W baffle is probably most efficient and should allow for smaller woofers but am I right in saying that the type of baffle should depend on the frequency range of the woofer?

In other words, something used as a true subwoofer could go in the W baffles but something used up to say 100Hz should be used on a plain baffle in the same plain as the midrange driver.

[navin]

W baffle? I colud visualise a H baffle but a W baffle what is that?