That plastic diy vacuum forming video was pretty cool - very nice professional looking results. It is rather thin though so will need to have some sort of backing to stiffen it.
One idea is if you have access to a horn or WG now that you like, make a positive mold with it using plaster of Paris - just plug up the throat and insert a divider so that you only make a half mold form at the middle plane.
Then vacuum form around the plaster mold. The original wave guide should clean up nicely. You could go into production with this method.
After listening to this speaker I can see that a higher quality woofer would be more appropriate to get the most out of the sound quality. I have decided to upgrade the woofers with a pair of RS180P-8's that are on order. These are a little smaller but have higher sensitivity (90dB) and more xmax. Most importantly, they have a cast alloy frame and more advanced motor with shorting rings to reduce distortion. I did not get RS225's as those are much bigger than the DC200's and won't fit in the box.
An externally hosted image should be here but it was not working when we last tested it.
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Nice New woofers x.
Your points on the already developed horn rings true. Its all a matter of how much I can land a pair in Aus for... And how much effort/cost it will take to build my own.
If I could refine the process well enough I'm sure many aussies would go for a pair of two, especially in the diy doof seen down here.
Yes, I would plan to build up the horn wall in layers.
Wesayso... I haven't looked at the Ariel thread in years. I'll head over and have a look.
Cheers gents.
Your points on the already developed horn rings true. Its all a matter of how much I can land a pair in Aus for... And how much effort/cost it will take to build my own.
If I could refine the process well enough I'm sure many aussies would go for a pair of two, especially in the diy doof seen down here.
Yes, I would plan to build up the horn wall in layers.
Wesayso... I haven't looked at the Ariel thread in years. I'll head over and have a look.
Cheers gents.
I haven't kept up with this thread, but looking at the updates in the first post, I am having a hard time believing the polar measurements.
You have - 6db point at 60 degrees at 50 Hz? How is this possible from a smallish horn? Something weird is going on and I would double-check the polar measurements.
You have - 6db point at 60 degrees at 50 Hz? How is this possible from a smallish horn? Something weird is going on and I would double-check the polar measurements.
Maybe there is something to be said for the leaky blanket covered open back cardiod approach for controlled directivity?
Maybe you right in that, and then change policy when building horn so that tech at backside of horn is as pretty painted and polished as the front of horn.
Attachments
Azurahorn AH-425
Azurahorn -Le Cleac'h Acoustic Horns - Products
A bit different from the horns on this thread. But I think it could be worth it...
1.4" throat, just like the 18-sound XT1464. Not bookshelf material but interesting...
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Ah, ok. But if the measurement is accurate then we may have accidentally stumbled upon an approach to control directivity down low without the negatives of traditional dipoles, i.e., dipole peak, EQ, power hungriness.
The response required plenty of EQ to flatten, the negatives were still there. That said, the phase (and frequency) response of the driver's output on the horn side is different than on the open back, so there are differences between this response and a "traditional" dipole.
Also, the measurement angle of the single woofer was different compared to the on-axis direction of a "traditional" dipole, and probably would not look the same if rotated the opposite direction.
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He did remake this measurement a little later and got this:I haven't kept up with this thread, but looking at the updates in the first post, I am having a hard time believing the polar measurements.
You have - 6db point at 60 degrees at 50 Hz? How is this possible from a smallish horn? Something weird is going on and I would double-check the polar measurements.
Look at post #427 here.
This thread is moving so fast that it's hard to keep up with the results 😉
/Anton
Thanks for the links wesayso.
The prices are way out of my league though and we have our first baby arriving in 6 months so the purse strings are automagically starting to tighten on the sound budget.
I'm sure it will be well worth it though. ;P
I'm also mad enough to build my own, for better or worse.
On a side note, I just got all the wood cut for a pair of Arts SynTripP 's. I think the throat is 1.4" so now I'm wondering about fitting the SB65 to them...
Then I just need a 10" domestic version of the Xoc1 tapped horns or similar and the party really starts... Bananas in pyjamas at 100db anybody?
Hmm, insert evil laugh!
The prices are way out of my league though and we have our first baby arriving in 6 months so the purse strings are automagically starting to tighten on the sound budget.
I'm sure it will be well worth it though. ;P
I'm also mad enough to build my own, for better or worse.
On a side note, I just got all the wood cut for a pair of Arts SynTripP 's. I think the throat is 1.4" so now I'm wondering about fitting the SB65 to them...
Then I just need a 10" domestic version of the Xoc1 tapped horns or similar and the party really starts... Bananas in pyjamas at 100db anybody?
Hmm, insert evil laugh!
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My RS180P-8's arrived yesterday - amazingly 2 days after order was placed and free shipping too. I have to say, I am quite impressed with their build quality: top notch cast basket with crinkle paint finish, great neatness of glue and fit and finish, nice paper cone, solid aluminum phase plug, a large beefy magnet, and built-in EVA foam rubber gasket on the bezel rim backside.
To top it all off, the first thing I do when new drivers arrive is I put them to the TS parameter test with a DATS v2. These drivers measure spot on within 2% of all critical parameters like: Qms, Qes (and Qts), Mms, fs, Vas (was a little more off at 24 liters vs spec 22 liters but not a problem) and the surprise was that the Le was much lower than quoted at only 0.2mH at 10k. Anyhow, when a Qts spec of 0.34 measures in at 0.35 - I am happy. Also, the predicted sensitivity was almost spot-on too, coming in at 89.5dB at 2.83v.
Dayton does not exaggerate their TS parameters like some manufacturers. This driver is a great value at $51 for a 6mm xmax 89.5dB driver.
These will be swapped over for the DC200'8's shortly.
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I plan to sit it on top of a large 15 inch sub - in sealed cab - same width and depth but height optimized to put horn at listening height.
I love the stealth "Darth Vader" look! Great job!
"pffuffhhh, pffuffhhh, Luuuuke, I amm your Faathhurrr..." 🙂
"pffuffhhh, pffuffhhh, Luuuuke, I amm your Faathhurrr..." 🙂
Not that it needs a sub... but I guess now you can dig down to 20Hz vs 30Hz at 100dB 🙂
Any ideas on a decent 15 inch pro sub? I would go for the dayton UM15-22 but can't get them in the UK - I will be EQing via DSP in a sealed cab.
Keep the sub close to the floor, use it, don't fight it. I probably would have picked 2 smaller drivers.