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Old 10th August 2006, 02:36 PM   #1
inrank is offline inrank  United Kingdom
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Default 8" full range

ok, i want to build an efficient, cheap full range speaker....

whats the best out of

Beyma 8AG/N (seen this in a horn on this website)
Visaton BG 20 (cheap B200?)
Monacor SP-200MX
Ciare CH 250 (10" though)
Omnes Audio L8 (low Xmax)

i would like to prefably make an OB speaker as it is easier to make and cheaper, dont need low bass (anything below 80Hz is a bonus)

would i need a tweeter with any of these?

only experience before this is using the CSS FR125S, need somthing with a bigger sound and wont get flustered at higher volume levels...
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Old 10th August 2006, 02:45 PM   #2
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Monacor SP-200X would be my first choice if you can't stretch to the B200. The Qt is 0.52 so it's in the right ballpark for open baffle, and it has a decently low 50Hz Fs and good excursion. Plus, it's cheap (about 30UK each, which isn't going to break the bank) and very well made for the money. It only goes up to about 12KHz really, so you might need to bring a tweeter in. That's easy enough though, and there's plenty of options, which again, aren't too costly. Plough through the Dark Star thread Dan Mason began on the Red Wine Audio section of www.Audiocircle.com for innumerable ideas that you could shamelessly plunder for baffle dimensions etc -that's what the DIY community is about after all.
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Old 10th August 2006, 03:10 PM   #3
inrank is offline inrank  United Kingdom
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so is it really worth paying 3-4 times as much for the B200?

my current speakers are KEF XQ1's and i dont really want anything less than them in preformance and clarity wise....
and i cant have a baffle bigger than 1 1/2 ft (460mm) by 3 1/2 ft (1100mm) but then my room is only about 10ft by 15ft.

aslong as i can get a fullranger that 'rocks' (mabye thinking of going into tubes, as the efficiency is key in the speakers)
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Old 10th August 2006, 03:23 PM   #4
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Is the B200 worth about 3 times the price of the Monacors? Yes. It's a truly astonishing driver.

The Monacors will be fairly close to your XQ1s (pretty good speakers BTW) though they'll need a tweeter as the KEFs have a very good HF (bit strong for my taste, but there you go, taste's a funny thing). The B200s are unlikely to need a tweeter, and I suspect you'd never bother about upgrading again. They are high end drivers. This might interest you: http://www.6moons.com/audioreviews/r...roadtour5.html

The baffle size you mention is a bit small to get the full benefits IMO, as bass is going to go AWOL. There's the JE labs thing that goes near the floor, but I can't say I'm a fan of it. Plenty are of course, but using boundaries to reinforce the bass seems to me to be throwing away one of the principle benefits of dipole radiation.

However, if you've got the room, you might want to think about hinged side pieces that you can swing out when listening, and fold back when the speakers are not in use, like the Omega Dark Star variation in the above link.
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Old 10th August 2006, 03:32 PM   #5
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yeah, that folding design looks quite good, i do have a sub, although i dont use it atm, which could be used.

how loud would the b200, and the others i mentioned (without too much distortion) go with say a 10w tube amp, or a 70w primare a20?
would it be the case of 'loud enough'?
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Old 10th August 2006, 03:58 PM   #6
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Far louder than is medically advisable.

10wpc tube on the B200 is killer. 300B SET, 6L6 SEP, sound out of this world with the B200. EL84 sounds thin.
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Old 10th August 2006, 04:00 PM   #7
inrank is offline inrank  United Kingdom
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if so, where could i get/make a SET amp thats relatively cheap? (100-200) or are there any other alternatives for the price?
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Old 10th August 2006, 05:08 PM   #8
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For your projected budget, I'd actually say SET probably = bad idea.

Some form of T-amp, suitably tweaked to death would be the best bet I reckon. Unless you're happy building things from scratch, in which case one of the innumerable gainclone variations, or best still, one of Nelson Pass's Zen amps would blow your mind.
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Old 10th August 2006, 05:29 PM   #9
dmason is offline dmason  United States
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The Charlize T amp is well known to work unbelievably well with the B200 on an open baffle.

Go to the OB Thread on www.decware.com on the Forum for Speakerbuilders, and find many very happy senior-level tweak-o-philes extolling the virtues of their Charlize/B200 set ups.

www.diyparadise.com and it doesn't need tweaking, not at all. Add a SLA battery, and be happy. Charlize has great bass, non strident highs, and is just plain synergistic with the B200. This combination provides ridiculously great sound for a pittance.

Build a baffle with wings, similar to the one discussed on Audio Circle, pix courtesy of Vinnie. The narrow front baffle with swept wings of unequal width works by far best, concluded by a very great deal of experimentation. Use good plywood, and go the extra mile of "veneering" the front and back of the baffle with cork. Now you have an outstanding sound system that will easily kill very expensive, multi-drivers-in-a-box monkey coffin type commercial speakers, and ruin your ability for any future enjoyment of those types of alignments, due to boxless sound, and unequalled coherency offered by wideband drivers of exceptional quality.

You can wring the utmost out of the B200 by ordering the driver with the wooden phase plugs from Planet 10, right here on DIY Audio. The accounts of improvement in overall presentation seem to make this effort pretty much mandatory. IMO.
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Old 10th August 2006, 10:38 PM   #10
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If you follow Dan's advice, you will be a happy camper. No-one knows the B200 on open baffle better; if you hadn't already noticed, you're talking to the man who started the Dark Star thread, and is directly responsible for the Omega OBs (which I hear should be emerging soon, right Dan?), to say nothing of the link between Red Wine Audio and Omega Loudspeakers that has proved so rewarding for all concerned.
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