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Foam Core Board Speaker Enclosures?
Foam Core Board Speaker Enclosures?
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Old 6th August 2018, 01:00 AM   #3021
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
All drivers survived. Actually the speaker I was most worried about were the FH3 homage with the curved back wings. They made it because box stayed dry.
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Old 6th August 2018, 01:01 PM   #3022
xrk971 is offline xrk971  United States
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Hi Linuxguru,
Your PM box is full. Wanted to say congrats on the LF08 design.
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Old 6th August 2018, 01:58 PM   #3023
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Thanks, XRK - I didn't actually do much with the LF08 after the LTSpice simulation modelling some years ago. Hopefully, I'll get back to it sometime soon.
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Old 6th August 2018, 02:08 PM   #3024
xrk971 is offline xrk971  United States
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You should start a thread on it in the SS forum or even Headphone forum. It’s a cool design and deserves its own thread and a nice layout and build which JPS64 and I are willing to do. JP and I simulated it with all BC860/850 and added a pair of outputs. It can drive 50ohm. We are off topic, but hey... It’s my thread.

How are your TPY3 black Kevlar line arrays holding up? Are you still using them? I have a pair of those drivers that Rockk got from you and sent to me. Excellent drivers - wish they did not discontinue them.
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Last edited by xrk971; 6th August 2018 at 02:12 PM.
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Old 6th August 2018, 02:53 PM   #3025
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Cool, I'll revisit the LF08 shortly and do the appropriate follow-ups. Regarding the Tymphany drivers, I kept a set for a line array, but haven't built the cabinets yet. I did use them in dual-driver TABAQs with 2x 12 ohms in parallel.

Recently, I built an oddball prototype 2-way TABAQ with a Panasonic T8PL19C6 3" 6-ohm plastic-cone sub driver and a Tymphany 3" 6-ohm Kevlar-cone driver as the mid/tweeter in the same enclosure, spaced 10 cm apart. The XO is a passive first-order with -3 dB at ~4 kHz for the sub and ~2.5 kHz for the mid/tweeter (i.e. some overlap from 2.5 kHz to 4 kHz). It appears to be audibly workable, though it should probably be crossed lower, maybe at 1.5 kHz or so. Maybe even an active higher-order XO or a FAST-type design, crossed much lower. Just a random brain-fart, but I was pleasantly surprised with the initial attempt, which probably can be improved with a larger (4" or 5") aperture woofer with a lower Fs.
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Old 7th August 2018, 01:35 AM   #3026
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Well, I had written a nice long post about how these sound, but I opened one of the pictures full-size in the preview and lost the whole thing. Derp. Anyway, XPS MLTLs, 55L net volume, they sound pretty good. Bracing is key. A lesson from this is choose a driver well suited to ported designs if you're going to vent them.

Here's some pictures:
IMG_2084.jpg
IMG_2066.jpg
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Old 7th August 2018, 02:55 AM   #3027
xrk971 is offline xrk971  United States
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Nice design. How is XO being done? Did the AMLTL technique work for you?
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Old 7th August 2018, 02:59 AM   #3028
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Default Foam Core Board Speaker Enclosures?

These are a transplant from my first DIY bookshelf speakers, so I already had a second-order Butterworth crossover at about ~2.5k if memory serves. As far as whether or not the AMLTL worked out, they have much better bottom end extension than they did before. As I havenít built a more typical BR with them at this tuning, I donít really have an apples-to-apples comparison to make. Certainly not a disappointing result for the one afternoon of work.

Edit: to add onto my statement about choosing the correct drivers and something you said in the original AMLTL thread: high QTS didnít really work out great, I think a moderate QTS driver would do better. These are 0.92.

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Old 7th August 2018, 02:23 PM   #3029
xrk971 is offline xrk971  United States
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Usually moderate Qts from 0.45 to 0.70 works best with AMLTL technique. Glad it’s working. Well for you. If you wouldn’t mind posting the particulars of your AMLTL derivation in that thread?
Thanks,
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