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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 4th February 2017, 04:41 PM   #21
Xerxes75 is offline Xerxes75  Netherlands
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Join Date: Jan 2012
Location: Leersum
Any progress?
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Old 5th February 2017, 12:21 AM   #22
pcgab is offline pcgab  United States
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Join Date: Dec 2014
2/3 Way - 'Reference' build
Quote:
Originally Posted by Xerxes75 View Post
Any progress?
Not as much as I would like certainly. I got some more cauls cut, so I can hopefully start the panel lamination process this week.

I'm sketching the final cut and assembly plans as well, before I do too much cutting.
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Old 5th February 2017, 12:26 AM   #23
pcgab is offline pcgab  United States
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Join Date: Dec 2014
2/3 Way - 'Reference' build
Quote:
Originally Posted by Xerxes75 View Post
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.
Thank you!

The ~25liters came from X's success with that relative volume in his version.

WinISD suggests ~23.1 as ideal for sealed.
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Old 5th February 2017, 09:46 AM   #24
Xerxes75 is offline Xerxes75  Netherlands
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I Will be looking forward to the progress, good luck
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Old 21st February 2017, 02:24 AM   #25
pcgab is offline pcgab  United States
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2/3 Way - 'Reference' build
Quote:
Originally Posted by Xerxes75 View Post
I Will be looking forward to the progress, good luck
Thank you!
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Old 21st February 2017, 02:37 AM   #26
pcgab is offline pcgab  United States
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2/3 Way - 'Reference' build
So, I've had a tiny bit of time to make a little progress.

I put together a crossover, to give one channel a listen and to serve as the foundation for measuring.

My modifications to X's crossover are as follows:

C1/C3 is replaced with one 60uF capacitor. I may experiment with bypassing this with some small value, 'high quality' caps at some point.

C2 is 2.22uF, not much value difference there. I had to parallel a few caps I had here.

L1 is 4mH because that's what was on buyout from PE, I will be ordering some other values to get closer to the 4.08mH or wherever I need to adjust this.

R4, IIRC X mentioned this was the DCR of the inductor he was using. My inductor is 0.44R. I have some 1R Mills MRA12's I can put in series to get a bit more resistance if needed.

I cut a quick test baffle for the FF85wk, that's a bit bigger than the tiny little test baffle I cut at first. I chamfered the face of the baffle some as well.

I only had time to listen for ~10minutes to a few pieces of a couple tracks last night. It sounded pretty great, all things considered. I should have put it on a stand to get it away from the wall, I'm fairly certain there was some reflections causing issues, but it was just a very quick and dirty quick listen.

I'll be measuring it properly soon, likely this weekend.

I need to find a supplier for black MDF/HDF. Would be great to find one near me, or a company that will ship 1/4 or 1/2 sheets.
Attached Images
File Type: jpg IMG_3562.jpg (388.7 KB, 402 views)
File Type: jpg IMG_3573.jpg (442.0 KB, 400 views)
File Type: jpg IMG_3574.jpg (458.3 KB, 407 views)

Last edited by pcgab; 21st February 2017 at 02:41 AM. Reason: removing sideways pics to correct them
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Old 27th May 2017, 07:14 PM   #27
pcgab is offline pcgab  United States
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2/3 Way - 'Reference' build
So I've finally been able to slice off a bit more time and make some progress on this project.

I noticed on the initial measurements that the impulse response for the woofer was upside down. I had the polarity reversed. So I fixed that, then took a few measurements.

I test various set-backs for the hf baffle, the best seemed to be ~1.5" back from the front of the LF baffle.

Here are the spl, impulse and distortion measurements from the recent round of testing.
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File Type: jpg 20170526_0002_0004_0006_SPL.jpg (214.1 KB, 339 views)
File Type: jpg 20170526_0002_distortion.jpg (294.6 KB, 105 views)
File Type: jpg 20170526_0002_impulse.jpg (175.2 KB, 656 views)
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Old 27th May 2017, 07:40 PM   #28
pcgab is offline pcgab  United States
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I'm in the process of making new baffles to test, they will be a bit bigger (wider/taller) for the HF portion and will have the 'set-back' built in.

Hopefully I can get those built sometime soon, and test them out.

I just noticed that I have the wrong value in R2 in the schematic I'm going off of. I put in 2.5ohms, instead of 5ohms. I'll correct that and re-measure this weekend.

At some point I am going to test adding some B&G neo3's to the mix. I'm not quite sure where is a good place (hz) to try to add them in. I need to do a bit more research there.
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Old 5th June 2017, 07:33 PM   #29
pcgab is offline pcgab  United States
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Join Date: Dec 2014
2/3 Way - 'Reference' build
I was able to make a tiny bit of progress on some test baffles this last weekend.

I'm going to test adding a B&G neo3 on top soon as well, if I can slice off enough time soon I'll do a few rounds of measurements with that setup.
Attached Images
File Type: jpg IMG_3854.jpg (314.1 KB, 64 views)
File Type: jpg IMG_3855.jpg (367.1 KB, 37 views)

Last edited by pcgab; 5th June 2017 at 07:36 PM. Reason: fix images
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Old 5th June 2017, 10:41 PM   #30
xrk971 is offline xrk971  United States
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2/3 Way - 'Reference' build
Click the image to open in full size.

Hmm... this looks like the tweeter is inverted now as the taller peak is downwards. Also looks like you need to add more time delay by moving the tweeter back more until the woofer triangle lines up with the tweeter spike. I did this by flipping woofer above tweeter and placing setup so tweeter is below ear level so takes longer to reach ear vs woofer.
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