Comments on Profile Post by Ardacer

Check the RST28F-4

Zalp used a 2" midrange dome + the ND20. One could do that but the RS52AN is not a small frame. One could do RST28F-4 + TD20F-4 which might also be a step up from the ND20.

Or maybe just do TD20F-4 + RS52AN + RS180-4... Not Zalp and not Amiga. Either way even changing the impedance of the model yields not-negligible differences to the point that I could call that a different animal.

That's what I was talking about. So much amazing stuff from Dayton, easy to get lost. I have 20 tabs open while thinking. I'm gonna use lx521 for stereo and for LR channels of my 7.1, and thors made from dayton dcs385 as subs, and probably 5 more dayton little boxes.

Also regarding Zaph's concerns with distortion down below, simple biamping with a 48 db slope crossover at signal level solves any problems, but introduces a bit of complexity. It's sure nice to have 2 drivers with identical impedance and sensitivity... Or even three, yes

Yup. I'm hesitant of crossing to a TD20F-4 because of the extra xover components. But that 3/4" tweeter + a large 1-1/8" tweeter, or small 2" midrange, and you have something very special when combined with the RS180-4. I actually admire the ScanSpeak drivers. But it is not clear to me they have a definitive performance edge over the RS Daytons.

Perhaps more of a mater of preference in some ways. The ScanSpeak might have lower cone breakup issues, but I think I've heard they are hard to cross too. Having a 3rd order filter for the Dayton is really no big deal IMO.

f**k that! Forget about the TD20F-4 for this application... RST28F-4 + ND13FA-4 seems like a match made in heaven.

ScanSpeak is way too expensive for what you get. It'd be great to see a wide range of IMD tests on all these units to actually see what's going on... And also, Dayton is cheap, really nicely built and looks amazing too

Well, the ND13FA-4 looses sensitivity though. But man, I think it was @maverickronin who brought that one to my attention. A 5 kHz cross over and bam!

Well, you are at around 7mm wavelength at 5kHz, so some lobing would be anavoidable unfortunatelly... Perhaps in far field with very steep crossovers it'd be really great

Actually, ND13FA-4 and RS180-4 seem to have similar sensitivity. One would only need to adjust the RST28F-4 and listo!

You'd have a wide gap in the 3000 khz useable range unfortunatelly. Thought of that one a lot.

Dude. Take a look at the ND13FA-4. That 1/2" guy is supposed to be crossed at 4.5 kHz and above. Dispersion and smoothness above 4.5 kHz is awesome.

Also the RS180-4 would start beaming like crazy that high.

I agree that just RST28F-4 should yield great results though.

ND13FA-4 is wet dream I'll buy 10 probably

I would do: RS180-4 crossed @ 1.5kHz + RST28F-4 crossed @ 5 kHz + ND13FA-4. Should probably not have too many beaming issues.

I'll model that tonite.

Maybe make the baffle slimmer as it goes up too, that'd help with dispersion too probably.

Nah. We'll see. I really only care at up to 45 or 60 degrees. Using two tweeters this size allows for close location with the 7" woofer. But one would need to think more about placement. Side-by-side tweeter, one on top of the other, small tweeter sandwiched between the larger tweeter and the woofer... Dunno yet.

Classical lower-mid-upper makes most sense to me always (in my mind) - should be minimal lobing, or simply throwing all three circles as close to each other as possible on a bit bigger baffle, but then you don't have a sleek tower. Why only 60 degrees?

+/-60 degrees. It depends how far and wide the sweet-spot. Note the plate on the RST28F-4 is about 4". I tend to agree with you about the positioning. It should make horizontal dispersion bestest. A little concern about vertical dispersion with a three way depending on how close to the speaker.

Just gave it a try: crossing the three tweeters. It is possible but I needed 3rd order all over, and not feeling confident about it. Proly best to keep it RST28F-4 + RS180-4, or if 3-way go for the 2" midrange.

How much do you really gain from the ND13FA-4? 16KHz is about it for me, so an RS180-4 & RST28x-4 would be really tempting. 11 litre sealed box for use with subs, and there's a shallow faceplate for the RST28x-4 that's only 3 1/4" tall, so could make a center channel with vertical alignment that's only 12" tall. Avoids the comb filtering of an MTM center

It's not high frequency extension what you gain with the ND13FA-4. Is dispersion characteristics. A larger sweet spot (45 degree +) and a more omnidirectional response all the way to 16 kHz. In general, I don't like MTM configurations. But for center channels and practical considerations, sometimes it can't be helped.