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Lab12 Based Bandpass Sub

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Jebimasta View Drop Down
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Joined: 08 August 2011
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jebimasta Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2018 at 3:11pm
Can't wait to have a little workshop space and to put a few grand down into a small CNC router, then I'm sure I'll be churning out stuff like that Wink
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doller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2018 at 10:15am
I can't remember or find the original thread. I think he said he was going down to 25hz. Hence the mega ports. I did kinda copy his bracing when I built those Art's. But just such nice work. He really balances the the look of the cab with the driver. As said many times the lab lacks spl. It is an issue on P.A. That said I still love how those Art's sound. In a small (ish) room they do get where you want them to. Why didn't emmy give it a bit more? I know the Danley story. Maybe it isn't possible with that cone. I have no idear.???? Old crocs..Please.
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DMorison View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2018 at 11:02am
Originally posted by doller doller wrote:

As said many times the lab lacks spl. 
<snip> Why didn't emmy give it a bit more? I know the Danley story. Maybe it isn't possible with that cone. I have no idear.???? Old crocs..Please.

Driver power handling is a product of all the design decisions that go into its final specs.
For example, if you give a driver stiffer suspension, it'll be harder to cause over excursion, thus allowing higher power to be applied.
If you give it better cooling, you'll allow more power to be applied etc.

In the case of the LAB12, it's designed to be used in a horn where much of the excursion control comes from the acoustic loading of the horn, so the suspension doesn't provide as much excursion control.

It's also intended to be used in a small sealed chamber, and even with the aluminium access plate, that gives very little cooling.

So - the end result of those design decisions which optimise it for the Lab Horn, is lower nominal power handling.

Remember also the relationship between power handling and SPL - even if there were no power compression or excursion issues, doubling power handling only yields 3dB more volume (all else being equal), so not necessarily much benefit.

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doller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2018 at 11:50am
Thanks mr Morrison. Like I said I do know why the lab is the way it is. In a lab horn the spl is no issue what so ever. But excursion is tightly controlled by the rear chamber. ( I have them ).TBH i find that 800 to 1000w is plenty for a Lab horn. It will take more but why bother, expensive error. for 3db. They will run all day everyday at that. Tried and tested. In a reflex box I would say that spl is. Great for home theater however.
I really like the lab drivers they give very clean bass. Shame it seems like a one box speaker so few plans around for other options. No bfm replys please.
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