Using BB ply so that should also help.
I will try to post periodic updates, i generally get an hour or two here and there ao it might take a month to build.
The OSTL is the green trace. It is less sensitive than the PAL12, but has a wider usable bandwidth.
Sometime ago someone used the MLTL workbook from my site to design one for the LAB12 and reported getting good results. I have not personally built and tried one.
Sometime ago someone used the MLTL workbook from my site to design one for the LAB12 and reported getting good results. I have not personally built and tried one.
excursion will limit the OSTL's advantages below 30hz... but that's a moot for PA.
Very flat & smooth though! where's the design for this? would be tempting to use less wood per box, and just more drivers, though you'd need more Amps/watts.
I still like the sensitivity for the PAL12.
Very flat & smooth though! where's the design for this? would be tempting to use less wood per box, and just more drivers, though you'd need more Amps/watts.
I still like the sensitivity for the PAL12.
actually - the smoothness (and size) of the OSTL makes it VERY attractive to me as a studio sub! It looks to still add 2-3db of efficiency to the LAB12!
I'm actually running rare TL studio monitors (capable of 113db), so to leave the 70hz+ out of them and cross over smoothly to a LAB (with potentially 25hz in room + eq)...
I'm actually running rare TL studio monitors (capable of 113db), so to leave the 70hz+ out of them and cross over smoothly to a LAB (with potentially 25hz in room + eq)...
I have an enclosure very similar to the PAL12 with a Lab12 in my HT. It is much taller though for 20Hz extension. I am very happy with the way it sounds.
I have the wood & drivers for PAL12s and others that have built them are generally very happy with them...so I will move forward with my PAL12 project.
I have the wood & drivers for PAL12s and others that have built them are generally very happy with them...so I will move forward with my PAL12 project.
My prosound buddy Pete, who has built 8 Labhorns for his bigger rig, uses PAL 12 for his smaller gigs, and has had no issues with either.
Any chance we can see the plans for the OSTL?
Any chance we can see the plans for the OSTL?
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My point for posting the OSTL option is that, going with the PAL12 TH instead, you only gain about 2dB in the passband for a box that's over double the volume, AND you end up with a higher cutoff point as well. And bear in mind that I've actually given up a bit of passband gain in the OSTL design to widen the bandwidth.
I don't think the LAB12 is a really good match for a TH designed for 40 Hz pro audio use. Yes, you can get "good" results, but I think you can end up with better results using a driver that's a better match for that type of use.
I don't think the LAB12 is a really good match for a TH designed for 40 Hz pro audio use. Yes, you can get "good" results, but I think you can end up with better results using a driver that's a better match for that type of use.
I assume the Fs in the 20s has something to do with your comment about the LAB 12 in a TH for PA use. I'm looking at home use down to 27 hz (lowest note on a piano) and can get drivers needing a reconing free, plus I'm not interested in dealing with the limited bandwidth of the TH. Yet, anyway.
Not just a TH, but a 40 Hz TH. The LAB12 was designed for use in a FLH with a small chamber (which results in an Fb > Fs). There's no such "chamber" in the PAL12. The result is a particularly non-flat response, if you build the box as simmed.
I've attached a sim of a simple TH of around the same volume, using a 15" driver that's a better "fit" for a 40 Hz TH. This is the Dayton Audio PN395-8. This can be built using a THAM or MTH type fold (and using the workbooks from my site to come up with the appropriate dimensions for the box). The passband is a lot smoother and the midband gain is better.
I've attached a sim of a simple TH of around the same volume, using a 15" driver that's a better "fit" for a 40 Hz TH. This is the Dayton Audio PN395-8. This can be built using a THAM or MTH type fold (and using the workbooks from my site to come up with the appropriate dimensions for the box). The passband is a lot smoother and the midband gain is better.
Attachments
Interesting, I recall looking at the original dual LAB sub FLH. I do already have the LAB12 now, so I wanted to build something worthwhile to crank the volume, use a bit for PA (I'd build 2), and maybe even turn on in the van for fun.
Is there another design you'd recommend for the LAB12?
I'd consider building 15" compact TH, smooth & loud sounds great! A couple of those would probably kick butt for the main bands I'm running, as well as more electronic music if I decide to perform with them.
Brian Steele's OSTL could be the ticket, or sealed + eq. The LAB 12 is a little dated now but does have an inch of linear excursion (p-p) and soldiers on in pro sound rigs everywhere.
Sounds good. I got busy, so seeing your photos will help with my motivation I'm sure!!
Also - someone nearby posted a pair of Keystone 18s for sale... So that is tempting
Also - someone nearby posted a pair of Keystone 18s for sale... So that is tempting
