What 12" should I put in

justpoor · 14th April 2007, 02:41 AM

the empty holes here...... Will be buying a couple plate amps. Also what tweeters for top end helper. Thanks.

justpoor · 14th April 2007, 02:44 AM

.........

justpoor · 14th April 2007, 02:46 AM

......

mashaffer · 14th April 2007, 03:22 AM

Seems like we would need to know the volume of the bottom chamber and a little something about the other drivers there.

mike

justpoor · 14th April 2007, 03:26 AM

Dimension is 32"x16"x11" - Cabinets are sealed but I can make it ported by cutting a hole rather easily. I am open for anything (inexpensive is even better.) The fullrange drivers are no name vintage alnico Japanese speakers.

djn · 14th April 2007, 06:22 AM

are you putting subs in those lower cabs? What is the range of the top drivers and are they right for OB? I like the looks. Cheers.

Scottmoose · 14th April 2007, 09:49 AM

Well, this is what you'd get out of an Eminence Beta 12A in that box, with a 4in diameter, 3in long port installed, with it's centre 3in up from the internal base. The Eminence units are very good indeed IMO -loads of excursion, bomb-proof build, and exceptionally well engineered. Not particularly expensive either. Should be pretty easy to XO to the upper dipole unit as they run up a fair way pretty smoothly, and their lower roll-off should match to room-gain nicely. Given their near 100db sensitivity 1w/1m, the plate amps are going to be idling.

As for tweeters, try the Fostex FT17H horn loaded tweeter. Nice unit. Again, not very expensive & the sensitivity is pretty high at nearly 100db 1w / 1m. Better to have a high sensitivity than a low -it's easier to cut things than to boost them.

justpoor · 14th April 2007, 12:48 PM

DJN, the full range are good for around 60hz ~2000. They sound quite nice in OB.

Hey Scott, since the Eminence Beta 12A are so efficient, perhaps I can just put a large choke in them and cross them at ... says 200hz and run them parallel with the fullrangers without plate amp. What do you think.

Scottmoose · 14th April 2007, 01:30 PM

That's what I'd probably do. Unless you're thinking about going active, I can't see much point in using a plate amp in this case, as we're looking at near 100db efficiency levels for that section.

mashaffer · 15th April 2007, 05:55 AM

Though designed for a horn sub I was shocked at how well the Lab12 Generation II from parts express simmed. A little pricey at 175ish dollars but if it actually performed this well...

mike

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14th April 2007, 03:22 AM	#4
mashaffer diyAudio Member Join Date: Jun 2004 Location: Indiana	Seems like we would need to know the volume of the bottom chamber and a little something about the other drivers there. mike

14th April 2007, 03:26 AM	#5
justpoor diyAudio Member Join Date: Feb 2005 Location: USA	Dimension is 32"x16"x11" - Cabinets are sealed but I can make it ported by cutting a hole rather easily. I am open for anything (inexpensive is even better.) The fullrange drivers are no name vintage alnico Japanese speakers.

14th April 2007, 06:22 AM	#6
djn diyAudio Member Join Date: Oct 2004	are you putting subs in those lower cabs? What is the range of the top drivers and are they right for OB? I like the looks. Cheers.

14th April 2007, 12:48 PM	#8
justpoor diyAudio Member Join Date: Feb 2005 Location: USA	DJN, the full range are good for around 60hz ~2000. They sound quite nice in OB. Hey Scott, since the Eminence Beta 12A are so efficient, perhaps I can just put a large choke in them and cross them at ... says 200hz and run them parallel with the fullrangers without plate amp. What do you think.

14th April 2007, 01:30 PM	#9
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	That's what I'd probably do. Unless you're thinking about going active, I can't see much point in using a plate amp in this case, as we're looking at near 100db efficiency levels for that section.

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