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Multi-Way Conventional loudspeakers with crossovers

2/3 Way - 'Reference' build
2/3 Way - 'Reference' build
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Old 28th January 2017, 03:16 AM   #11
pcgab is offline pcgab  United States
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2/3 Way - 'Reference' build
Had just enough time tonight to prep the prototype enclosure for the RS225 for measurements tomorrow or Sunday.

I lined the rear panel with 1/4" natural wool, as well as the 'face' of the first brace and all four walls of the front section of the enclosure.

I added 16oz of Acousta-stuff, then mounted the driver.

Hooked it up to a chip amp and my iphone and played a few test tones and I have to say I am seriously impressed by the lf output. Meaningless subjective anecdote aside.... needless to say I'm quite excited to get some real measurements.

I threw together some half-assed test baffles for the ff85wk's as well.
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Old 28th January 2017, 03:18 AM   #12
pcgab is offline pcgab  United States
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A few pics of some of tonight's progress.
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File Type: jpg IMG_3514.jpg (506.2 KB, 581 views)
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Old 28th January 2017, 02:05 PM   #13
jrh0516 is offline jrh0516  United States
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Might consider a flush mount FF85 test baffle, although the ring by the surround makes me question whether there would be any benefit.
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Old 28th January 2017, 03:14 PM   #14
pcgab is offline pcgab  United States
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Quote:
Originally Posted by jrh0516 View Post
Might consider a flush mount FF85 test baffle, although the ring by the surround makes me question whether there would be any benefit.
I considered it, and will likely test with it flush mounted at some point as well.
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Old 29th January 2017, 05:48 PM   #15
xrk971 is offline xrk971  United States
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Great work pcgab!

Nice wooodworking - very clean.
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Old 29th January 2017, 06:48 PM   #16
pcgab is offline pcgab  United States
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Quote:
Originally Posted by xrk971 View Post
Great work pcgab!

Nice wooodworking - very clean.
Thanks X!

I just took a few sweeps of the RS-225-8 in the prototype box. I'll post the graphs shortly.
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File Type: jpg IMG_3517.jpg (729.9 KB, 520 views)
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Old 29th January 2017, 10:59 PM   #17
pcgab is offline pcgab  United States
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3 sweeps, ran @~0.5m distance. all 1/12 smoothed. The ~300hz drop is a little concerning, though I'm not sure where it's coming from.

I didn't have time to baseline, then adjust stuffing, so that session will have to happen in the next few days. I have 1lb of acousta-stuff fluffed and in the box. The box is ~25L.

I don't know if I have too much or too little, googling didn't provide any formulas, so I'll do the test/measuring and see how it affects response.

Any insight is greatly appreciated here. Certain behavoirs, etc. I should look out for.

Thanks!
Gable
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File Type: jpg RS-225-8_All_SPL.jpg (170.9 KB, 466 views)
File Type: jpg RS-225-8_Impulse_Response.jpg (201.7 KB, 155 views)

Last edited by pcgab; 29th January 2017 at 11:00 PM. Reason: forgot attachments
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Old 30th January 2017, 12:51 AM   #18
xrk971 is offline xrk971  United States
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That looks about right. The dip at 320Hz is probably the floor bounce. Put mic 50cm away and elevate speaker at least 36in off the fooor (centerline ) and use frequency dependent window (FDW) 6 cycles in REW to remove effects of reflections. The falloff from below 1kHz is usual 5-6 Dan baffle step loss.
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Old 30th January 2017, 01:54 AM   #19
pcgab is offline pcgab  United States
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I'll have to measure the stand to see how high it was.

I applied the FDW and it did improve a bit. Glad to know it looks normal. I'll leave the stuffing alone for the time being.

Thank you for the insight X!

Hoping to start late this week on building the 'dagger' tl, 3-sided prism for the TC9FD/10F testing.
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Old 1st February 2017, 10:55 AM   #20
Xerxes75 is offline Xerxes75  Netherlands
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I want to build a nice (two way) bookshelf for sometime. But the threads mention in post 1# kept me from building a two way because I find the use of an full range driver (and the Dayton Woofer) very interesting. So I am following this thread and maybe I learn something from it.

I already have one question... you put the Dayton in a 25 litres sealed box. Is this the optimum size for it? (I don't have simulation software).

Good luck with your build!

R.
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