LIVE SOUND Specific Tapped Horn thread...
It sort of makes sense to possibly start a tapped horn thread specifically for live sound. Since the requirements are more of sheer volume, compromised frequency response, and most of all portability.
Timing TH to system??
Paging DR Tom or any of his minions
Exactly how do I go about timing in a tapped horn sub to my horn loaded tops? How do I account for the phase shift caused by having the sub driver at almost 90 degrees to the mid driver.
I have two units I'm working with. One has a higher angle and seems to mesh with the tops well but doesn't have the low end response.
The other has good low end but doesn't mesh with the tops and that one has a shallower angle (almost horizontal). Ironically
that one tests the best by a couple of db over the first one.
Seems like this thread belongs on the live audio board where TD and others 'hold court': http://www.prosoundweb.com/index.php/home/
THEY DON"T LIKE DIY. For good reason.
Even so, the focus there is really just on the LAB horn. There has been much more info on this forum regarding TH designs, including participation by Tom Danley himself.
As for integrating with tops, a crossover with delay function would seem appropriate. Most of the speaker DSP processors out there will do this, and some will automatically configure the delay between tops and bottoms for proper phase response. I'm looking at getting a Behringer DCX2496, but the DriveRack line from JBL will also handle this kind of stuff.
I too am looking towards building some compact TH subs. If you go through the huge TH thread, there is some discussion regarding the TH mini that is worth reading. I tried to model with subs I thought might be appropriate, but nothing got close to Danley's (as measured at the sub shootout). I'm thinking about either a dual 12" scaled down version of the LAB subs in TH design. More than likely, I'll probably be building single 12" boxes with more expensive, high excursion drivers.
I think it's important to state what you are trying to accomplish. In my case, I'd like extension to 30Hz. I realize this is kinda low for PA subs, and the tradeoff will be box size and sensitivity. But, as a bass player, I'd like to be able to reproduce the low B string fundamental (31 Hz). What are you looking to build?
screamersusa, what is the latest update on your various THs?
When I was working on the BFM cabs, I got a lot of flak.
Lots of folks over there told me to just go buy xyz speakers, ignoring the stated fact that I had no funds to do so.
I've heard thier suggested boxes against both my old DIY boxes and Th modded BFM and mine won. My clients agreed. Unless I could buy some Meyers or Yorkies, I couldn't do much better than what I have.
So I stopped mentioning any DIY boxes over there.
Thanks to Davids new version of horn resp, I was able to model the baffle and spacer as a chamber and found one of my problems. I think I'm having an issue figuring out folds.
The 3015LF isn't great.
I have two final boxes ready for outdoor testing.
The Bulldog has not changed from 34x34x22.5
It looks like a decent utility box. Packs well, and sounds pretty
good in pairs.
The PATH15 got bigger, 40x25.5x31. Fits through building doors fine and Van doors too, and I should be able to get 4 in the trailer easily. It's got wheels and handles like the TH-115.
It's fairly flat with a nice bump at 50 and 45, another rising slope
from 115 peaking at 120 at 107db (inside test) so it will meet up with the Omnitops. Its usable up to 130hz and down to 40 at 100db and 38 at 96 (inside test), however I would cut it hard at 38 because there is something about the 3015lf that goes bonkers below 40 and you run out of xmax with only a few watts.
It's not stiff enough.
The path is also compressed while the Bulldog is not.
The bulldog is a smaller Variant of J Bells box. It also doesn't mind 2225H drivers at all (-3db).
compression seemed to help the acoustical impedence a lot while dropping a few more hertz.
I'll pick one of these as I am out of time and am exausted.
I stopped counting at 16 builds. So one of these will have to do.
I'll post everything on there in this thread since they are intended for live use. Oh yeah, TH's couple very well :)
The B.I.T.C.H., is on hold as I need to get better with compression and transmission lines to make it work right and find a better driver. It got really complex
and loud but not much below 50hz. almost 4 sheets of plywood
crammed into a 40x28x21 box. I tried to get too much out of the 3015lf.
screamersusa, everything you've attempted thus far sounds good and I am pretty sure you are exhausted. 15 builds in less than a month is unimaginable!! Hats off to your persistence.
Looking forward to seeing the details of your designs.
I thought I'd mention that Don Snyder has built a fairly huge TH using the LAB12 drivers and he says that they go lower and louder than the 3015LF TH.
May be a TH using 2 x LAB12s may not be a bad idea; only have to figure out driver placement. If one chooses a compression chamber it would get very complicated.
How about this configuration...
craigwalsh, your configuration looks very promising. I installed Hornresp on my PC only last night. I need to learn how to use the program. So I'll try and make some sense of what you have posted.
In the meantime, if you or others who are inclined would take this forward, it would be a great contribution to the forum.
Thanks and regards,
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