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Old 8th April 2007, 09:14 PM   #491
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A Jordan one tooo...

dave
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Old 8th April 2007, 10:19 PM   #492
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Quote:
Originally posted by planet10


(or as my buddy says BAVR),

dave

for those that have figured it out, that's Big Ar$e Vent Reflex
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Old 9th April 2007, 08:23 PM   #493
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Default Cheap Drivers

Hello again,

Thanks for the responses Scottmoose and planet10, that makes good sense. I noticed the Replikon horn on the net and saw a few other examples of BVRs which has made me think that this is a decent way to design an enclosure.

I saw that "Bruce" can be made with a Monacor sp200x as well as fostex and Hemp Acoustics fr-8. I couldnt find a price on the Monacor's but the Hemp's I saw were $125 a piece, which wouldnt be the end of the world, although cheaper would be better at first.

I am thinking it would be good to build some Bruces and get some cheap drivers, then if they work and are promising I could drop in some nicer drivers. Do you have any suggestions for cheapish drivers that would work well for any of the BVRs especially Bruce?

Thanks again,
Mark
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Old 9th April 2007, 08:36 PM   #494
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Mark,
if you can't/won't spend shillingi mingi on drivers my bets would always be on Monacor. Available in Europe, which saves on shipping costs and time, and their quality to price ratio is excellent.

Greets,
Pit
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Old 9th April 2007, 08:56 PM   #495
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You're welcome -glad to help when possible.

http://www.spectrumaudio.de/breit/mo...corSP200X.html

Wolfgang is, so I hear, an all-round top-bloke. And look at that response. Nice & flat, although it'll probably need a super-tweeter up-top.
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Old 10th April 2007, 06:46 PM   #496
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Yay, just finished the new platform bed and now it's on to bigger and better things. The BRUCE!! (BTW thanks for naming it Bruce, made it a whole lot easier to sell it to the girlfriend)

I had two quick questions.

1. Could the Pioneer BUFU20 be used in this design?? At 1/3 the price of the Fostex 207 it could be a good savings. But, if it would reduce performance too much, it wouldn't be worth it.

2. The little wedge/absorbent strip at the throat. Does anyone have experience or thoughts on which may be better?

Thanks,
Bruce
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Old 10th April 2007, 07:30 PM   #497
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Hi Bruce

Er, Bruce shouldn't need the absorbant strip as it's vents operate over a much more limited passbad -they cut off just over 100Hz or so, so the output shouldn't need damping.

The Pioneer is supposed to be a good unit for the money, but it's far behind the 207. I'd go with the Fostex.

If you're wondering where the name came from, it's actually named after the metal singer & Iron Maiden front-man Bruce Dickinson, who I've always greatly admired. Pity his albums are so badly recorded as musically they're actually pretty special.
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Old 14th April 2007, 11:31 AM   #498
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Default Driver Placement

Hello everyone,

I am looking forward to getting some time and money so I can start building, for now I have to wait... I was just wondering one thing about Bruce. I think I saw either Scott or Dave said that driver placement was important with these cabinets. Would there be any negative effects to dropping the driver to the bottom of the speaker baffle about a half inch shy of the bottom edge to leave space on the baffle for a super-tweeter (I have my eye on the smallest Aurum Cantus ribbon)? I could see how breaking the vertical symetry might unbalance the use of the throats at the back. Any ideas?

Thanks,
Mark
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Old 14th April 2007, 06:31 PM   #499
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Default Re: Driver Placement

Quote:
Originally posted by markgoespop
Would there be any negative effects to dropping the driver to the bottom of the speaker baffle about a half inch shy of the bottom edge to leave space on the baffle for a super-tweeter
I don't think enuff to worry about... that's what we plan for our 207/FT17 Bruce....

dave
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Old 15th April 2007, 08:07 AM   #500
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In addition to the iBIB(possibly k) for my 206's, I am going to start making a pair of Harveys for the 126's I just got today (thanks planet 10, these are awesome!).

I've heard rumor that the double horns may one day be remodelled with non-symetrical horns to even out the FR a bit. I was wondering if raising the whole chambered part (all else remaining the same) about an inch or so may have this effect, or if it requires a complete redesign and I'm best to leave it alone.

This would result in two very close but not quite equal horns, the top one would be about 2 inches shorter and a few square inches less mouth area. This speaker is intended to perform well in a variety of environments, so tailoring a specific FR is pointless, but flat is probably desireable.

I would assume that the slightly larger, floor loaded bottom horn would dominate, but past that I have no predictions on what would actually happen.

I don't intend anyone to waste time modelling this idea, and if it's a bad idea I'm happy to stick to the plans. Just wondering.
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