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Multi-Way Conventional loudspeakers with crossovers

Small Syns
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Old 9th May 2018, 08:26 AM   #391
3ll3d00d is online now 3ll3d00d  United Kingdom
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decided to drill through as per instructions so hopefully get the drivers mounted this weekend and some measurements collected

box.jpg
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Old 9th May 2018, 07:00 PM   #392
bwaslo is offline bwaslo  United States
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Looks really good.
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Old 15th May 2018, 09:06 PM   #393
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I got the drivers wired up, took on axis measurements and fed them into your xo design. Leaving aside the droop at the top end (and the fact I haven't taken off axis measurements yet), I'm not sure if it's a bit bumpier than the design, what do you think?

xo.png
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Old 15th May 2018, 10:48 PM   #394
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and with the individual responses

xo_with_drivers.png

and the underlying raw data per way

synx_raw.png
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Old 16th May 2018, 02:21 AM   #395
bwaslo is offline bwaslo  United States
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The one at 100Hz is expected -- an interraction between driver/box/and inductors. Couldn't bring that down without clobbering efficiency. But then it's down where room interractions are at play so just another bump into the mix down there.

The one at 2kHz seems pretty high (and in a touchy place). Is your L2 inductor a particularly low-ESR part? You can try bumping R4 an ohm or so to bring it down.

Edit -- oop. Wrong version design. Try adding some resistance in series with L2 to bring down the bump.
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Old 16th May 2018, 02:22 AM   #396
bwaslo is offline bwaslo  United States
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But all told, not terrible. How does it sound?

Maybe Trim R6 (increase) a bit to raise midrange -- there is a diagram in the instruction PDF showing what some of the trim values can do.
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Old 16th May 2018, 09:14 AM   #397
3ll3d00d is online now 3ll3d00d  United Kingdom
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It's just in a sim atm so I don't have it to listen to yet unfortunately. I had seen the suggested variations so wanted to get it into a sim first so I could play around with that & also verify the result before I order the parts..

I intend to be crossing this to a (sub)woofer anyway so the peak at the bottom of the woofer is not a problem. The peak at 2kHz with the dip just beneath it was the bit that made me pause to wonder whether this is as per design or not.

what does C7/R3 do btw? IIRC removing it didn't seem to have much of an impact (on a sim with the on axis data only in that is).
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Old 16th May 2018, 05:20 PM   #398
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c7/r3 are just shaping, they drop the bottom end of the cd down a little in level relative to upper end. Subtle effect
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Old 16th May 2018, 06:00 PM   #399
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Quote:
Originally Posted by bwaslo View Post
c7/r3 are just shaping, they drop the bottom end of the cd down a little in level relative to upper end. Subtle effect
Got that backwards (having a bit of difficulty looking at things today) -- they drop the HF a little, sloping the overall response downward
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Old 22nd May 2018, 09:51 PM   #400
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I took the speaker outside today and measured to 90 degree horizontally and 60 degree vertically because I wanted to play with the crossover. One thing I noticed on the mid made me wonder where it comes from and whether it requires some tweak to the mid ports.

Here's the normalised horizontal, seems pretty similar to yours except for that notch around 1kHz

smallsyns_hor.png

not noticeable on the unnormalised view though

smallsyns_hor_un.png

and with just the mid active, you can see the peak at ~1080Hz collapses to a dip by ~40 degrees

smallsyns_mid_line.png

I can't think where that could come from if not the way I've moulded the ports.
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