I picked up a pair of the SEOS-838 waveguides from Cinergy. I didn’t have a specific project for them in mind at the moment, but I’m sure I can come up with something . 38mm throat intended for dome tweeters.
These things are super chunky! Very thick material. 5/16" outer flange. 3/8" driver flange. They gave the driver sealing surface a light sanding, and did a good job cleaning up the throat. They only listed glossy finish ones, but sent satin finished ones. No complaint from me, I prefer satin anyway. The dimensions seem a little larger than they list (~8 5/16"W, 4 9/16"H, 2 1/8"D)
Cinergy threw in a 3rd one with a note “I added an extra for experimenting”. I’ll use it for testing out different tweeters/mounting. But once I’m done with it I’ll probably bring to InDIY for anyone else interested to use as a test mule.
No, the SEOS geometry is great - not too many pro driver ppl here, even though this is made to fit regular tweeter. The only person in here that I know if who has used a SEOS waveguide is Brad (hifiside). DIY audio has quite some fans.
I’d been considering getting a pair to go in a 2-way with the Sig10 and the RST28 tweeter. But recently someone shared a link to somasonus who has a 3D printed waveguides specifically for the RST28. Not sure which route I’ll go. Be interested to see what you think of the Seos once you use it
I did with the original RS28F-4 and RS270P-4 paper 10” woofer. Here is some limited information I posted about it awhile back. WG 2-way design thread. — MAC/DIY Are you local to Chicago @DrewsBrews btw?
I also brought a SEOS-8 design to Iowa this year, which I called “the Ochos”. They use the SEAS 27FFC tweeter, which bolts right on to the waveguide, and SB Acoustics SB20PFC30-8 (8 inch polymer frame woofer).
It’s a nice WG. I’ve got used it with Dayton RS28a (OG - I believe it was designed for this tweeter) as well as the ScanSpeak metal-nipple ring radiator and (my favorite on this WG, I think) Seas 22TAF wide-surround tweeter.
Looks like the screw holes line up well enough with the 3dprinted adapters that beastmode or nip ring would mount right up. I need to get some hardware.
Got some quick measurements. DX25BG60-04 with the 3Dprinted adapter. I just plonked it on the carpet with no baffle. Aimed the mic down ~2ft away and guesstimated angles (roughly 0, 15, 30, 45)
The one time I used this tweeter, the notch that I used to squash the resonance peak seemed to dominate. It wouldn’t let me cross below ~1.8k, though I ended up ~2k. That was probably due to the Q of the notch (width of range of influence). If I made it narrower that would probably allow lower crossover IE: Filter shape more like a spike, rather than a mountain.
I don’t know that I’d get 1khz out of it. ~1.5khz would probably work with anything I’d need it for.
I went back through reviewing measurements and mulled over the distortion on these a bit. The HD3 is rather telling; dropping down to a low point at 1.24khz. If you can get a highpass down that far, looks the tweeter would give zero effs.
DX25BG60-04 is ~$35 right now. And the SEOS-838 is ~$20. So I supose the question is: Would there be better options for $55 if you also needed a low crossover?
. 38mm throat intended for dome tweeters.
