High Efficiency Speaker Asylum

RE: F12N in a box

65.90.54.194

DHT 4 ME

In Reply to: RE: F12N in a box posted by amnesiac on July 02, 2007 at 12:15:40

They are a much thicker paper. The A-12/ F-12 cones are very thin. I have replacements that I bought from the same Ebayer for the A-12. If you use the thicker cones you will loose a few db's. The F-12's are very good in an OB. I recommend 2 per side minimum. 15 -25 watts should do well.

Bob

Follow Ups:

RE: F12N in a box - amnesiac 21:52:42 07/02/07 (1)
Hi Dht Could you please elaberate on what advantages 2 per side brings.Are they limited in output? This will be blowing my budget.And all so any guess how the heavier cones may affect performance other then efficiency eg frequency responce. Thank you
- RE: F12N in a box - DHT 4 ME 22:33:56 07/02/07 (0)
  The bass response falls off fast in an OB so you need the extra output to compensate . I ran 2 and crossed one in at 300hz @ 6db . that worked well in my room. The first tweeter I used was a Sequerra ribbon crossed in at 1600. That was a little too high so I got a Radian 1.4" in a waveguide from Parts Express @ 1k. I would not use a heavier cone as it will screw up everything good in the driver.
RE: F12N in a box - nullspace 18:37:10 07/02/07 (2)
Hi Bob --

I think you said that you've moved on from the Jensen field coils, but could you tell us a bit more about your setup when you had them? You ran two of them in parallel? And what kind of high-freq driver did you use? And where did you cross them at?

Thanks for the help. I have a quad of A12 I'm working with, and am thinking of using Altec 802's on AH 1000hz horns for the top end.

Regards,
John
- RE: F12N in a box - DHT 4 ME 22:37:40 07/02/07 (1)
  That would work well. Biamp or use an autoformer and you will be amazed at the imaging. I also recommend a sub to lighten the load in the bottom .
  Really nice drivers with a little bit of tweeks. See my past posts on the A-12
  Bob
  - RE: F12N in a box - nullspace 07:38:46 07/03/07 (0)
    Thanks Bob. I do have a pair of 21" woofers suitable for OB that will be doing <100hz.
    
    Regards,
    John

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