8 inch RCF coax

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They looked interesting, until I saw the published FR. Seems like the HF unit isn't particularly well integrated, but at least it has a mylar diaphram, which is a big plus for me. Haven't used them, so might sound OK in practice. My interest was piqued to see if I could use them in my bass guitar rig.

I also found a few places in the US that were a couple of $ cheaper.
 
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Mackie does use RCF stuff in their products, and they also own RCF or they merged or something- they are part of one group.

A lot of pro stuff seems to have some pretty screwy response curves. Maybe this one is just a bit more honest. The fact that its pretty sharp spikes rather than rounded reinforces this.

I wonder how this sounds vis a vis the Radian 8" coax at $340
Or the 10" Eminence coax Adire uses in their monster PA box w/ an 18" woofewr
 
Seems like any time the HF unit fires through the cone, as in the typical coax, you see a truly bizarre response plot, though I must admit this one looks like a malfuntioning HF. Jeez, what a mess.

Way better off with a two way. The 8" portion looks pretty good, actually.

I've heard the big Altec 604, 605, and some Tannoy, so I know coax can be done well.

Tim
 
Tim Moorman said:
Seems like any time the HF unit fires through the cone, as in the typical coax, you see a truly bizarre response plot, though I must admit this one looks like a malfuntioning HF. Jeez, what a mess.


Tim

How about the coaxes that use a small horn instead of using the bass driver as an extention of the horn. Anyone heard these?

This is what i mean. i think these are pretty cheap too.

http://www.paudio-europe.com/products/db_1_6.htm

about half way down. Altec i beleave did this as well.
 
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Hey guys, you have to scroll down on the link , but there they are!

I think Tannoys and some Altecs did this in the past. Some highly regarded drivers.

The rap against them I believe is that you get resonances from the areas between the back of the horn and the woofer cone.

How about something like these but with a conical type horn?
Maybe we could make our own from these models, but unscrew the rectangular horn and substitute the conical?

I guess this probably doesn't help... If the horn diameter could be
smaller , maybe, but I was thinking it could be mounted in a cylinder/ phase plug type thing the diameter of the voice coil.

So the opening of the horn could be about 4" . Anyone know the cut off frequency for a 4" horn?

Paudio makes some good stuff I think....
 
>I think Tannoys and some Altecs did this in the past. Some highly regarded drivers.
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Altec did. AFAIK, all Tannoys just use the cone as the 'horn'.
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>The rap against them I believe is that you get resonances from the areas between the back of the horn and the woofer cone.
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Yes, that was one of their problems, but their later designs got around this by making a large enough horn to lower the XO point enough that it is not an issue and horn load the main cone to get the best blend in the XO BW: http://www.lansingheritage.org/html/altec/specs/pro-speakers/9864.htm
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>So the opening of the horn could be about 4" . Anyone know the cut off frequency for a 4" horn?
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~13560"/pi/4" = ~1079 Hz, though its pathlength will determine the LF corner/roll off rate, with a 1/4WL considered to be the acceptable minimum.

GM
 
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