Cal's next venture

[Cal Weldon]

4 X 12" Community 0.8 ohm woofers
plus Sammi 12" coax.
68" high

 

[mondogenerator]

like all the best things in life, TRUELY NUTS

 

[CLS]

0.8 Ohm woofers ?

 

[c2cthomas]

0.8 Ohm woofers ?

Mounted to the floor yet!!!! SWMBO ain't gonna go fer dat idea!

 

[Cal Weldon]

Yes, I thought the meter was playing tricks on me until I saw the stickers on the woofers. All eight measure 0.7 to 0.9 ohm DC, no kidding.

 

[Cal Weldon]

SWMBO is shaking her head as I type but has the smarts to know this is better motorcycle racing or parachute jumping so has agreed to allow me my vices.

 

[Pano]

That will be a tall speaker!

 

[badman]

3 Woofers 1 coax 1 woofer in the vertical line would be better than 4 woofers 1 coax. You're doing OB?

 

[CLS]

But ordinary drivers of nominal 8 Ohm impedance have 5~6 Ohm DCR / about 3 Ohm DCR to 4 nom., no?

Are these 1 or 2 Ohm double VC woofers?

 

[Cal Weldon]

3 Woofers 1 coax 1 woofer in the vertical line would be better than 4 woofers 1 coax. You're doing OB?

Yes, I am thinking like you with the layout but they will have to be a ported box. Low Q on those woofers.

 

[Cal Weldon]

But ordinary drivers of nominal 8 Ohm impedance have 5~6 Ohm DCR / about 3 Ohm DCR to 4 nom., no?

Are these 1 or 2 Ohm double VC woofers?

Hi, Yes like you I've found most 8 ohm woofers measure around 6 ohm DCR. No argument there. These are single coil and measure .7 to .9 DCR even though the OEM type sticker clearly states 0.8 ohms impedance. I've not run into anything like these other than of course the Dr. Bose specials. They are a medium quality stamped steel 2" coil PA type driver.

 

[CLS]

That's really new to me.

What's the plan in connecting them? All in series? Or transformer coupled?

 

[Cal Weldon]

I will run them in series as they were in the original box.

 

[doorman]

That's all well & fine, but whaddya gonna put in the living room-- you know, where the BIG speakers live!!
(Good Luck with your project!)
Don

 

[badman]

That's all well & fine, but whaddya gonna put in the living room-- you know, where the BIG speakers live!!
(Good Luck with your project!)
Don

4 of those woofers in a vented alignment oughta have no problem with being refridgerator sized



Cal, have you considered an obstructed dipole? That can mass load it and push fs down/Qts up if I understand it correctly. The most common style is the "Ripole".

 

[Vix]

Cal, what amp is going to drive these woofs?

 

[Cal Weldon]

This is just another "Gotta scratch that itch" project. I don't have a use for the speakers but in the new configuration they will take up less room so that's what got me started. What I really need is some teenagers with a lust for volume to come visit. I have a bunch of this kinda stuff just gathering dust and it would go nicely in someone's basement. Once I clear some room I can start building some real speakers for me! This one is nice 'cause it uses up 10 drivers in one go.

Amp? not sure, maybe something beefy. Mind you these only need 10 watts. The things will only have an F3 of about 50Hz and a sensitivity of around 100dB plus or minus so I'll have to be careful.

 

[Vix]

Pass F5 then looks like a nice one.

 

[Zen Mod]

Pass F5 then looks like a nice one.

+/-18V PSU , doubled outputs , altered current protection

voilla

but - there is still problem that you either must buy you a new Giraffe neck , or bigger bar stool

 

[Vix]

Or hang them from the ceiling, upside down?