Supravox RTF64 design options (long)

[GM]

Greets!

You're welcome!

Hmm, the procedure I have is a bit more complex and requires more info such as the OPT's Kva along with its primary and secondary DCR, so can't do a comparison.

Anyway, I didn't reverse engineer the Singular, but ignoring any Qts rise from OPI (which will increase the pipe's Q (Qp)), the RTF wants to 'feel' a ~8.778 ft^3 Vb if tuned to Vp = Fs. Factor in the QPI and it jumps to ~12 ft^3! A nfb SE amp wants to 'feel' a flat impedance though, so net Vb falls a bit to ~7.325 ft^3, but Fp rises to 108.5 Hz for the former and 88.8 Hz/~8.3 ft^3 for the latter. As you shrink Vb for a given Vp, F3 rises just like any other vented alignment.

GM

[fred76]

Hi GM,

As usual, I learn a lot from your posts even if some of the more heavy on theory arcane stuff is still beyond my grasp. Thanks!

fred

[GM]

Greets!

You're welcome! Sorry 'bout that, I figure if an explanation is to have any validity it must include at least some of the techno-babble it's derived from just in case it needs to be corrected and/or elaborated upon by others.

GM

[Ciu]

Hello !

First, Sorry for my poor English vocabulary

Some other ideas for Supravox :

http://www.audiofanatic.it/Diffusori...TQWT215_1.html

http://www.yildiz.edu.tr/~ilkorur/speaker/supravox.htm


I've tested the supravox TQWT, this one with the front vent ; Quite nothing below 150hz !
Another idea in a sealed box, 42 liters, give a good response from 75hz ( my actual home system )
I'm working on a MLTL, around 92 liters, the preliminary tests seems to give the good way ....

R.C.

[felixx]

So.....you decided what enclosure you use?
I ask because I myself have the same difficulties in choosing the best enclosure but in my case the driver is 215RTF64Bicone.
Also I think an closed enclosure should work fine.I don't know how big it will be.......

[Scottmoose]

The larger it is, the closer the driver will be to performing as it would in free air. The 215 will need a BIG sealed box. Going aperiodic might help there.

[felixx]

Scott....
But in this case isn't better into a baffle?
Something like this?

[fred76]

Hi,

Scott's MLTL posted recently seems like the best compromise to me now WRT size and performance. I mean the footprint is more manageble compared to the Tannoy type BR a few pages back. I'm interested in the Non-Bicone so the dims would be a bit larger than what he posted due to higher Vas.


Hi Scott,

Got your email. I just replied! Thanks!

fred

[schiller]

I see that the measured T/S parameters from this site
http://www.yildiz.edu.tr/~ilkorur/speaker/supravox.txt

are much more different from these of the manufacturer. Has anybody else tried to measure them?
I haven't any experience with loydspeakers, could this kind of descrepancy between measured-published specs be typical?
Or in other words: should i take the published spes nicht for granded?

Thanks in advance
Konstantinos

[felixx]

"The 215 will need a BIG sealed box. Going aperiodic might help there".


So ....to obtain 40hz flat ....what dimensions and, how many of aperiodic ports do you think is necesary?
Some kind of that enclosure with Manger driver.....go well to 40hz is here:
http://www.cooltune.ch/index.html
http://www.cooltune.ch/Projects/Menhir01.htm
http://www.cooltune.ch/Projects/AMVMenhir2b.pdf
The project is complex...but I think is well made.The aperiodic port is nice maded.
Any thoughts?