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Old 23rd December 2015, 10:16 PM   #1
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Default Mindsource's first build - SEOS / Dayton 2 way

Ok so I finally did it.

Denovo Audio SEOS-12 Waveguide 2/3 Bolt Matte with 1-3/8"-18 TPI Adapter

Dayton Audio D250P-8 1" Polyimide Compression Horn Driver

https://www.parts-express.com/dayton...eaker--295-434

It will be a sealed enclosure, active crossover/dsp, bi-amped with class D 50w x 4.

DSP will be JRiver and Asus Xonar Essence 7.1

Drivers will be here early January, I will start modeling the enclosures in autocad over the next little while. Everything will be laser cut or cnc so I can get very precise. I guess I will use 3/4 mdf cld box in a box. Not sure what to use for cld, green glue?

Thinking the front of the cabinets will have a flange that will go flush into a baffle wall in the front corners of the room. With ample toe in.

What mic should I get for measuring? I'm on a budget.

Gotta track down some 30ppi reticulated foam here in Canada for a good price too.

This project will take a while. This should be fun.

Last edited by Mindsource; 24th December 2015 at 01:16 PM.
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Old 23rd December 2015, 10:42 PM   #2
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Cool project! Are you choosing the "hi-fi" woofer for low end extension?

For the mic I'd recommend a professionally calibrated unit rather than a "factory" calibrated mic. It's more expensive but you might as well do it right the first time. I got mine from Cross-Spectrum here in the US. I'm not sure where you'd source the foam in Canada. The best source I've found is here in the US and is actually local to me. He imports it from Germany. I'd say worry about getting a good xo designed before you start playing with the foam.
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Old 23rd December 2015, 10:51 PM   #3
xrk971 is offline xrk971  United States
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I got my UMIK-1 from Cross Spectrum Labs too. It is a calibrated relative to itself but does not have absolute cal. You need an SPL meter to calibrate the gain. Also, the default gain was too high and I had to open it to adjust the dip switch to lower gain. Good mic though. Does this mean you are not doing the Trynergy then?
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Old 24th December 2015, 02:18 AM   #4
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Nate - I'm choosing that woofer because it seems like the best budget 12" for a sealed cabinet. Sticking with 12" to match the dispersion of the SEOS-12. Yes I'm interested to know how low it can go.

I think I will take both of your advice and go for that umik from Cross Spectrum Labs.

X - It does mean I'm not going Trynergy. I probably would have built one by now had PE not given me such a run around. After some thought and consult I'm going to cut my teeth on this project. It's simpler to construct, a tried and true design. I will still be watching with interest on how you tackle the HF dispersion on the Tryngergy.
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Old 24th December 2015, 12:19 PM   #5
wdecho is offline wdecho  United States
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I am curious on how you will like the Dayton driver. From the description it is being compared to the B&C DE250. I have considered building using the same components except using the more efficient Dayton pro woofer.

Dayton Audio PA310-8 12" Pro Woofer

I went to horns 30 years ago and I have never looked back. As for how low it will go, that is what subs are for. It will go low enough for most. My LaScala's start dropping around 90hz but the bass it does make is fantastic being horn loaded and is good enough for me and if I want more low bass I turn on my sub of which I rarely use. It is a personal taste kind of thing.
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Old 24th December 2015, 12:32 PM   #6
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Mhm, That Dayton Pro is what was originally recommended to me. But with the poor conversion from CAD to USD I had to stop the bleeding somewhere. All together these drivers costed me over $100 more just because of the low Canadian Dollar I got them in a hurry because PE botched my last order so bad that I was able to convince them to give me free shipping on this one. Which would have been almost $250 CAD!!. ouch.

Anyways I will be exited to see how these compression drivers work too. If they are what they say they are then I see it as a pretty good investment. I can cut my teeth with this and as the pioneers here start fine tuning DIY Synergy's then one day I should have a good start to one.

Last edited by Mindsource; 24th December 2015 at 12:43 PM.
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Old 24th December 2015, 01:33 PM   #7
xrk971 is offline xrk971  United States
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I know you got the drivers already now so good luck. What happened with the PE order that messed up your Trynergy plans? That's too bad because the Trynergy sounds better than a compression driver in a waveguide. If you are sensitive to harmonic distortion - there is a very noticeable difference between -25dB HD and -55dB HD.

FWIW, PRV's D280Ti is fairly priced and an excellent performer worth looking into.
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Old 24th December 2015, 02:05 PM   #8
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Thanks for the suggestion X. I pm'd you.
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Old 24th December 2015, 10:36 PM   #9
djn is offline djn  United States
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Sealed Volume. 0.93 ft.

Sealed F3 60 Hz

Vented Volume 1.9 ft. Vented F3 37 Hz

It seems that woof would go lower we a vented cab.
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Old 25th December 2015, 06:34 PM   #10
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Indeed it does. I will stick with a sealed cab though.

Can anyone more experienced than me look at this graph and point out likely breakup frequencies?
Attached Files
File Type: pdf Designer12 Specs.pdf (247.3 KB, 48 views)
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