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Old 15th April 2009, 05:37 AM   #11
CFT is offline CFT  United States
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OK, so from the same Danish gentleman I suppose

Check out the thread from Audioasylum, some info on the box design recommendations
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Old 15th April 2009, 05:41 AM   #12
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Yes, klonew.

Thanks, I'll take a look.
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Old 7th May 2009, 04:48 PM   #13
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Ok..they finally got here and it turns out these are Flat 5A-II's (thanks to this Danish guy's completely inaccurate description). I don't really have the patience to go through returning these, so I guess I'll try them out.

GM, could you do your wizard thing and tell me if that Vas approximation would still be relevant?
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Old 7th May 2009, 05:31 PM   #14
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So yours says Coral 5A II, 3W nomimal, 8W max....on the back as well?

Just tested mine recently and realized one of mine had some scratchy noise at low freqs......

Anyway, mine does look the same as Flat 5 from the front, it's just that the magnet surround is different, and doesn't say Flat 5 II, but 5A II instead...

I will be interested to know any recommendation on the box design as well
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Old 7th May 2009, 05:44 PM   #15
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Yep..sounds exactly like mine. They aren't a matched pair either..one says 3W nom./8W max and the other just says 8W max, but both say 5A-11 on the back. Very dirty too..need to paint over some rust.

Best guess I can come up with so far (with no info at all other than 3W/8 ohms) is a 0.38 cu. ft. (10.83 l) or bigger box tuned to <67hz, assuming Qts is 0.4 and Fs is 70hz.

But I still have no idea what I'm talking about.

Have you seen any designs for the 5A-II on Audioasylum?
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Old 7th May 2009, 07:26 PM   #16
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Quote:
Originally posted by ballsingtripp

GM, could you do your wizard thing and tell me if that Vas approximation would still be relevant?

...........assuming Qts is 0.4 and Fs is 70hz.
Good as any I guess based on my previous erroneous assumptions which assumes Qo = Qts, so 0.55, not 0.4. IOW, the cab I previously suggested.

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Old 8th May 2009, 03:28 AM   #17
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See if these links help

http://db.audioasylum.com/cgi/m.mpl?...ghlight=cft&r=

http://diyparadise.com/coral_enclosures.html
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Old 15th November 2009, 09:46 AM   #18
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I have a pair of real Flat 5 II now.

The ones I got earlier as mentioned aren't exactly Flat 5 II. They have smaller magnet and coarser frame, etc, though the paper cone and cloth surround should be the same type....

BTW, suggestion on the enclosure, anyone?
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