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Old 14th July 2005, 06:03 AM   #11
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Location: Appleton, WI
space is pretty much the width of the driver.


The driver to wood expense ratio will most often
fall on the side of the wood.


The Voigts are made with tapered sides by splitting
one board-- poplar is pretty cheap and it has a nice
'ring' to it as I'm told though I have not used it.

What remains is the front and the back from 2 more
shelf width boards. Buying wood is what keeps me
from starting new projects. And tools.


;-)
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Old 15th July 2005, 05:26 AM   #12
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Well I modeled the driver in my room and man would that be boomy. It looks to me like If I tune to 22hz is the right tuning frequency in my room. Does that sound about right?

Any more info on designing the voigt pipe?

AJinFLA,
I am just interested in those type of tweeters and I want to try one really bad.

What kind of drivers are in your full range?

With room gain 22hz would be very low and less of a reason for me to have to build a sub.

I have been listening to the drivers for a couple of hours a day all week long and they sound pretty good. Right now a little thin sounding and the mids are very prodominant, but the highs seem alright and the bess is good. I want to build a quick set of boxes for these to see how they really sound.

I think this weekend I'm gonna use some scrap wood and build some test boxes, they will only be about 1.5ft^3 and probably using 1/2" MDF since I have quite a bit. I'm gonna try 40litres tuned to 30hz and see what happens. This way I can break them in and get a real feel of how they really sound. I'm interested Voigt Pipe and I really want to try different transmission lines and see which enclosure I prefer.

Thanks,

Josh
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Old 15th July 2005, 06:02 AM   #13
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Here's Fred's how to on the Voigt pipe.


http://fredt300b.smugmug.com/gallery/147575


I have another one around which uses an 8"

(A quick look showed the site no longer viable)


Also consult the Full Range Driver site for lots
of samples of a variety of designs.
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Old 15th July 2005, 01:20 PM   #14
AJinFLA is offline AJinFLA  United States
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Quote:
What kind of drivers are in your full range?
KEF Ci-200QR. $9 Audax woofers x 12. You could do something similar with the Pioneers without breaking the bank. The KEFs are 8" drivers also. My "wood" cost was $12 - total. Only a severe lack of the boom/distortion bass - that many audiophiles like - will result. I've always been of the opinion that the driver producing my midrange/treble should
not be the driver undergoing large excursions (aka large distortion) needed for bass. But thats just me

Cheers,

AJ

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Old 16th July 2005, 03:49 AM   #15
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AJinFLA,

How are those KEF drivers?

A buddy of mine came to me with two broken KEF drivers, something fell on them in his storage and he says we has plenty of each and wants to get rid of them.

The drivers that he has are the KEF SP1248 this is a coaxial driver with a really nice basket, I have some pictures on my cell phone and can also post them. Also says on there MB 160.

He also has a bunch of the KEF SP1298 also says CR160F. This is the one with the wizzer cone. Build quality of these are not close to as nice as the coaxials.

All drivers come with crossovers still attached.

Are theses drivers good for a fun project or are they not that great?

Thanks,

Josh
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Old 16th July 2005, 04:20 AM   #16
AJinFLA is offline AJinFLA  United States
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Josh,

the KEFs sound very nice, still much work to be done on these, but nice none the less. A bit of roughness in the treble typical to a coax driver, but also terrific imaging - also typical of a "point source" type drive unit.
I think your friend might be slightly confused. Or maybe I am . The MB160 is a KEF midbass, not a coax. Maybe it's some coax model that uses the MB160 midbass. I don't know that much about KEF. Also here is the (newer version) CR160F http://www.kef.com/products/ciseries...160fs_tec.html
However its a true fullrange w/ whizzer - so there should be no XO. Perhaps some type of bass blocker or 70V transformer? More confusion. If he's giving then away -TAKE THEM . KEF knows a thing or two about speaker design. That fullrange looks interesting. The specs say 60-16k +/_ 3db! The "power response" says quite different. I realize its not quite the FR, but...Might be another fun driver. I'd say give the ol' Pioneer a shot first. Nelson says they are nice - I'm inclined to believe someone so knowledgable as Mr. Pass.
Try them OB. You may be pleasantly suprised.

Cheers,

AJ
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Old 20th July 2005, 04:42 AM   #17
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Well after a really long week and a weekend full of work tonight after I was able to do a little research on the Voigt Pipes. I found a good website with the equations, couldn't find them on that site.

I was trying to see how big I would have to make it for the tuning frequency I want it. It seems to me that is doesn't really matter how deep the box is, the only think that matters is the length of the front baffle. For my tuning frequency I would have to make mine over 12 feet tall. The ceiling in my room is only 10 feet.

I might see if I can get like some 1/4" wood and build a voight pipe to about 42hz or so, but it looks like right now I don't have the time.

Any other suggestions on enclosures?

Thanks,

Josh
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Old 23rd July 2005, 05:45 AM   #18
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These are supposed to be a quarter-wave device, right? If your enclosure needs to be 12 feet tall, that sounds like your tuning frequency is around 20 hz. You can have a 6 foot length for 40ish hz, or fold it in half for a 3 to 4 foot tall enclosure.

I'm starting to think that a sealed enclosure with the Pioneer drivers would sound good- but a terminated tapered tube might sound better. I'll start running some numbers to see what it would take.
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Old 23rd July 2005, 09:11 PM   #19
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I'm running some in a 6 ft line, and stuffed to taste they
seem to be fine - nothing fancy.
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Old 25th July 2005, 04:46 AM   #20
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Yea I think I'm gonna try for a tapered pipe I'm just not quite sure where to start designing, but I'm gonna try to design one. These will be for a school project that I am doing. I'm going to compare the TL probably TQWT, a vented, and a sealed box. I'm going to try and run some frequency responce tests to schow the differences. I'd like to put a lot of time and effort into the TLs to make sure they are well designed and I'm gonna design a couple different boxes.

I cannot decided on a tuning frequency because of so much room gain. The only way to come up with a somewhat smooth responce is to tune at 22hz, which is really low with the fs on this speaker. What would you all recomend?

Today I got around to trying some open baffle. This is my first time bending wood and I'm very happy with the way it turned out. I went out and bought a much thinner blade, unfortunately much smaller, bt I can still cut almost 2" deep with it which was plenty on the 3/4 MDF I used. These speakers still need time to break in (I hope) because they don't sound that great. They sound is a little thin. Great bass responce though. Really great bass actually. I just went to Home Depot and bought two 4"x2" sheets of 3/4" MDF to try out. $10 each is not much and the $25 blade is nice too. The cuts I made were great and They bend very easily. I'm not sure of the angle of the wings, I was going for 30degree, but I just decided to step away from making them well designed, I just didn't care since they are temporary. Right now there is no bracing keeping them at this angle, just a little glue.

I had a friend come over and help me with making the slits, because my table saw is not giant and I needed a little help ripping 4" 24 times. He was very excited when I showed him what all of the slits did and then he heard the speakers he had a huge smile on his face. I wa talking to him a little more and I'm hoping he will become a member here and start building some speakers.

Anyway, here are some pictures.

Thanks,

Josh

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