Lab 12 Based Offset Driver - Mass Loaded - Transmission Line (OD-ML-TL) Design by Bj - Page 16 - diyAudio
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Old 10th May 2013, 05:04 PM   #151
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NWCgrad's OD_MLTL? Your link justs goes to the top of the page............ http://www.diyaudio.com/forums/attac...al_f3-21hz.jpg

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Old 11th May 2013, 11:08 AM   #152
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Quote:
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NWCgrad's OD_MLTL? Your link justs goes to the top of the page............ http://www.diyaudio.com/forums/attac...al_f3-21hz.jpg

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Sorry, it was meant to go to the post where I uploaded a picture of the one I built, it was a quick-ish assembly with extra glue and uglyness that I really did just to see how the OD-ML-TL would sound.

I've spent the last couple of days off and on putting together a pair of them with a lot more care. I have one finished and the second one just needs to have the driver opening routed and the last side glued on.

Here's the one that's done. (No finish work yet.) The other one is coming later today!
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Old 11th May 2013, 04:29 PM   #153
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I do like how the port flares out!
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Old 11th May 2013, 04:35 PM   #154
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It does look ready for business, can't wait to hear impressions of two of them. I am leaning towards using mine in a 2 channel music only system and going with a few 18" subs for HT. But everything is subject to change. Still have a few more months before I can start cutting plywood.
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Old 11th May 2013, 04:39 PM   #155
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A TTQWT will give you a wide frequency response for both HT and music!
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Old 11th May 2013, 05:04 PM   #156
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I have a TTQWT design from bjorno and tb46 for my 18" maelstrom x driver. It is tuned down to 13 Hz before the freq resp plummets and cone excursion goes crazy (10 Hz HPF required).

However, the enclosure is rather large. I am beginning to think 4 sealed subs (~5 cu ft each) would provide a smoother in room response and with a little EQ could get decent output to single digits. There are some blu ray's with significant impact below 10 Hz, but I'm not sure its worth the pursuit.

I'm torn, as I have never had a bass system that could go lower than 25 Hz with any authority. Perhaps I should find another 18" driver that models well in the bjorno/tb46 TTQWT design and couple the pair with the LAB 12's. The TTWQT design's projected response gets wonky above 60 Hz. I could use the TTQWT for the ULF and the LAB's for 30 to 120 Hz (120.Hz is the upper limit for the .1 channel).

Advise always sought and carefully considered. I am closely watching DrDyna's experience with this build. I assume they would play nice with the TQWT's. I have both a Behringer and MiniDSP for knocking down the peaks, hopefully the mutli subs will minimize the nulls (should let the literature). I am learning a lot in this thread, I hope it keeps going.

Last edited by NWCgrad; 11th May 2013 at 05:09 PM.
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Old 12th May 2013, 05:46 AM   #157
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That TQWT Oliver posted, which I believe to be along the lines of what you were talking about.........
Correct.

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Old 12th May 2013, 06:00 AM   #158
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Correct.

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I played with tb46's model on hornresp and it looked pretty good to my untrained eye. Everytime I learn something in hornresrep I forget it next time I use the program. It isn't vet intuitive to me.

Would be cool to "see" what his TTWQT looks like, I think it would be a great match to the Mal-X design he visualized for me. With bjorno and tb46 this adventure would have been stillborn.
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Old 12th May 2013, 06:53 AM   #159
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Actually, it's very good.

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Old 12th May 2013, 11:32 AM   #160
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I finished the second one yesterday and spent a little time listening to the pair of them. I'm going to have to have the placement dance, I think I'm going to end up with a lower LPF and subs toward the back of the room again, they sound a little anemic when they're up front like that. Plenty of wall-breathing down really low, but hardly any visceral "kick".

My girlfriend actually commented that she was "spoiled" on the tapped horns and wasn't very impressed..I'm going to blame 75% of it on placement.

Once I find a spot where I can get a little hair-raising out of em, I'll try some real full-power testing. To me, they have a lot of potential to be very musical and "vanishing act" type subs, but I might have to augment them with another giant tapped horn just to have something that'll suck the breath out of you for HT and for when the girl feels like dancing :P
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