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Old 27th January 2004, 11:03 PM   #11
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I bought eight of those ribbons a while back based on the
forum hype that was spreading like wild fire, $30 each. It's not
bad for a $30 tweeter, but I'd rather use a good soft dome
tweeter instead. I listen to aggressive metal music and I like an
overpowering sound system and this just doesn't have what
it takes, you would need one of those high end ribbons costing
5 - 20x more to achieve that type of sonics.

BUT, if you line source eight of these per channel that is
a whole new ball game if you parallel all eight for a 1 ohm
load. While most amplifiers are not rated for 1 ohm load,
I didn't have any problems driving 1 ohm tweeters because
they don't taxi the typical 'good' amplifier like woofers would.
Under this situation, the line source did very well to please,
but it could cost you about $500 just for the tweeters if
you went line array - hehe

Send an email to Danny at GR research, I think he has
some good domes tweeters for an affordable price, I think he
matches the tweeters....
http://www.gr-research.com/
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Old 28th January 2004, 04:24 AM   #12
VictorG is offline VictorG  United States
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Hey I was just thinking, why not go for this guy? It even gives you box volumes for certian frequencies at bottom of page? And it would let you do an all audax speaker system....

http://www.madisound.com/AP170G2.html

its $17, and its even shielded. B
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Old 15th May 2004, 01:36 PM   #13
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Wink Horn loading of ribbon

Hi,

If Ribbons have the disadvantage of low dispersion then can horn loading improve its dispersion without degrading its sonic abilities.

Thanks,
Goldy
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Old 16th May 2004, 06:06 PM   #14
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Hi Goldy,


no, can't do. What you can attempt, however, is to use a horn in order to narrow down the ribbon's dispersion at Xover frequency (and somewhat below) to match the mid's dispersion - in the horizontal plane only, that is. In vertical direction, the length of the ribbon ccompared to the wavelength will sooner or later make the ribbon behave like a continuous line source, i.e. with a very pronounced vertical beaming (or lobung, if you perfer that term).

Note that putting a horn in front of something with a rather linear frequency response will give an increase in SPL towards lower frequencies of this horn. That is, you will have to equialize this increase. Hopefully, it can be done with the HP filter of the Xover, but this depends on the very horn paramters. Also note that it'll be tricky to obtain "constant directivity" properties for your horn, unless you design is really sophisticated. (meaning: you'll have to put some considerable brain into it). And there is not really a point in buying a ribbon with a very wide diespersion at high frequencies (simply because it is very narrow) and then to modify this very property. I guess that at the end of the day, you're better off with just a plain vanilla ribbon (if at all, sometimes a good 19mm/0.75" dome can work wonder).

However, a noted above, the strong vertical lobing of a ribbon will affect the vertical dispersion of an MTM configuration (I don't suppose the ribbon be Xover'able below 3 kHz), especially if the centers of the mid's are not located within one wavelength at Xover frequency - the precise conditions are more complex, more strict and hence disappointingly seldom to satisfy. This is even more true if you put a horn in front of your ribbon (or whatever your tweeter will be), since the horn will be quite large. After all, you'll need at least some flaring in vertical direction. And also consider steep filter slopes, steep as in 18 (MTM) or 24 (MT, requires even filter orders) dB/oct. But this you'll have to do anyway to protect you ribbon from desintegrating as soon as a LF electron comes by.

As to the complexity of your project: you really might want to keep it very simple for starters. Nothing is more &^%# than to sink any amount of money in something that doesn't (and can't, as one realizes only after having paid) work.

Good luck & Cheers,
bk.
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Old 17th May 2004, 08:21 PM   #15
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Hi Goldy,

I have recently used this small driver
Vifa 4.5"

With this horn mounted externally,
CD horn

and some heavy resistors, I got very nice dispersion and imaging. I was very pleasantly surprised. From about 12 - 15 ft away, a bass wave seems to develop nicely and sounded good even without a woofer. Anyways, if you remember the Realitic Minimus 7's, well these are a step above them.

My girlfriend was impressed.

Her cat was not. Kept nipping at my leg during "testing"

They are not quite as shown as I have blocked off the port.
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