Dayton RS28F plus which Waveguide

[PassingInterest]

The Dayton RS28F works with which waveguide for a crossover at 1.4k - 1.6k?
I'd like to use a round waveguide, if I can.

[Mgboy]

Re: Dayton RS28F plus which Waveguide

I've heard (read) that it would likely not have a "problem" crossing that low even without a waveguide.

[Paul Ebert]

Re: Dayton RS28F plus which Waveguide

The Dayton RS28F works with which waveguide for a crossover at 1.4k - 1.6k?
I'd like to use a round waveguide, if I can.

From what I've read, the RS28F can go lower than that with no waveguide. So, you should be able to use any, though perhaps not all of them will be a good match.

[Mayhem13]

Re: Dayton RS28F plus which Waveguide

Hey PI, MarKK is the man.......

Here's his very helpful site

http://audioheuristics.org/

He's working with the 28 in a waveguide in his latest dipole project. There's some data here

http://audioheuristics.org/RS225%20dipole%20project/whats_new.htm

I think it's the 8" Dayton. Mark's a frequent poster here so you should be able to PM him for mockup details and such.

[markk]

Re: Dayton RS28F plus which Waveguide

The Dayton RS28F works with which waveguide for a crossover at 1.4k - 1.6k?
I'd like to use a round waveguide, if I can.

Yes, the RS28F has no problem with 1.4k without a waveguide.


I haven't actually finished the RS28FWG. I've stalled out with the dipole.

I'm at a bit of a loss. I don't want to go through the trouble of building a complete RS225 dipole since it uses 8 of the shielded RS225's. Or, well, I have 8 of the shielded ones but who is going to but it but me. On the other hand, I don't really want to spring for the newer, nonshielded versions unless they test markedly better than the old ones or PE sends them to me for christmas. (from santa. Why do I not think that PE will send me 8 of the new ones for free...)

It should actually be a fairly nice combo, but it requires a custom cut and custom mating of the waveguide to the driver. How I wish PE would make a WG that just bolts on to the RS!

[LSV8]

Re: Dayton RS28F plus which Waveguide

On the other hand, I don't really want to spring for the newer, nonshielded versions unless they test markedly better than the old ones or PE sends them to me for christmas.

If anything, comparison of measured specs aside, wouldn't you assume the unshielded versions would perform better in a dipole simple due to the lack of bucking magnet/cup restricting the rear of the driver?

Not saying this is the case... simply making an observation/guess.

[Pete Schumacher]

Re: Dayton RS28F plus which Waveguide

DoubleTap will have a MTM using the 28F and Usher 8948A ready soon. He used a slightly modified MCM waveguide to load the 28F.

[markk]

Re: Dayton RS28F plus which Waveguide

If anything, comparison of measured specs aside, wouldn't you assume the unshielded versions would perform better in a dipole simple due to the lack of bucking magnet/cup restricting the rear of the driver?

Not saying this is the case... simply making an observation/guess.

Yes, I think this is true. Whether it's true enough for me to spend another 400-500 on the unshielded versions, well.......

[PassingInterest]

Re: Dayton RS28F plus which Waveguide

Thanks for all the info, guys.
Wow! Markk did some serious testing. Very well documented.
I'm still reading through that.
I'll check DoubleTap's info also.

It is also good to know that the 28F can handle a 1.4k crossover without a waveguide.
Thanks again, guys.

[Mayhem13]

Re: Dayton RS28F plus which Waveguide

It's not just about the lower end boost, and with the RS it's still a big plus as far as HD from 1-2khz goes, but more about the benefits to directivity where the bigger diamter waveguides are concerned. DoubleTap and Pete can attest to this in regards to DT's previous OB Dipole 2way and i've got my own experience with the MCM and a larger 10" QSC that there's something really special that happens with a dome crossed low with a WG.

[PassingInterest]

Re: Dayton RS28F plus which Waveguide

Okay, great!
Thanks for the advice, Mayhem!

[PassingInterest]

Re: Dayton RS28F plus which Waveguide

Mayhem--Was this the MCM that you used?

I'd love to try the 8" PE sometime, but right now I am looking for something to go with a pair of 6.5" Klipsch drivers in an MTM and I think the 8" waveguide won't look right, snuggled between the 6.5s.

Any opinions?


Edit: I just found where John Krutke experimented with the MCM waveguide.

[Mayhem13]

Re: Dayton RS28F plus which Waveguide

That's the one. You have to make a jig and machine it with a router but certainly within your skillset.:D

I machine mine and then fill the voids with epoxy, inserting threaded inserts for the tweeter to mount. The way Zaph does it requires the baffle to be removable. It's a bit more work my way, but the benefit of the well damped plastic guide is worth it in my opinion. I'm doing an active/passive 3way with em now so i'll start a thread this week sometime with details.

[PassingInterest]

Re: Dayton RS28F plus which Waveguide

That's the one. You have to make a jig and machine it with a router but certainly within your skillset.:D

I machine mine and then fill the voids with epoxy, inserting threaded inserts for the tweeter to mount. The way Zaph does it requires the baffle to be removable. It's a bit more work my way, but the benefit of the well damped plastic guide is worth it in my opinion. I'm doing an active/passive 3way with em now so i'll start a thread this week sometime with details.

Great! I'm looking forward to following your new build.
Make sure you take a lot of pictures.

[superspeeder]

Re: Dayton RS28F plus which Waveguide

Subscribing...

As far as HD goes, would crossing the RS28F below 1.5kHz be beneficial without a waveguide? Will using a waveguide clean things up at these low frequencies?