Fane 18B (not XB) in 1850 horn

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   At the request of a guy on SJ, I'm pasting the salient stuff in here.

                Most Efficient Driver for 186 / 1850 / Looney Horn

                �  on: Aug 1^st, 2005, 8:35pm �

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Maybe this is the wrong forum to ask this on, but, what would people
suggest as the most efficient driver for a 186 / 1850 / Looney Horn. I
want to build a pair for a small room, I don't need maximum SPL's, I
use other drivers in it for that, what I want is a nice efficient
driver that won't need a massive amp to get a decent volume, but
obviously won't be able to blow the roof of either. 

I know drivers with a slightly lower EBP will sound more 'hi-fi' as Rog
Mogale puts it, as in the PD184 vs PD186 vs PD1850, which is why there
is the 186 and 1850 horns. So I want to know if anyone has built 'em
with an efficient driver and what they would recommend.

Re: Most Efficient Driver for 186 / 1850 / Looney

                � Reply #4 on: Today at 8:54pm �

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I dunno dude, a quick browse through usspeaker.com and I was ready to
suggest the P.Audio Challenger as it had a Qts of 0.27, but I checked
on P.Audio's website and that turned out to be bogus  <angry> 

So maybe, and remember I ain't ever tried this, the Fane Colossus 18B,
the regular Colossus B not the XB as the XB has a Qts of 0.323 and a BL
of 24.6 whereas the B has a Qts of 0.197 and a BL of 29.4, plus it's
got a 98dB sensitivity or a 4.25 no and is rated at only 400W, out of
the B, the B-600 and the XB, the B looks like both the most efficient
and the best suited in a horn (Lowest Qts, highest BL). 

 If I were you ask on http://speakerplans.com/forums they have one specifically for 1850 / 186 horn, or search the archives in case it's been done before. Good luck. 

Just to add, the difference between the 1850 and the 186 is that the
1850 is for drivers with an EBP of over 125 and a BL of over 28, the
18B has an EBP of 147 (EBP = Fs / Qes) and a BL of 29.4, so it looks
like you'd want the smaller rear chamber of the 1850 and not the 186,
but again check it on speakerplans forum.

 Basically, can someone check my headwork, and tell me if the
Fane 18B really is suitable for use in the 1850 horn, albeit at a lower
volume. Also will the high EBP, make it sound less hi-fi as Rog puts it?