I've got two spare Lab12 drivers kicking around and fancy building something for them.

I'm currently rocking Tony Wilkes f208 + fth12 and so think something to fill in the low end would be nice.

Since a labhorn i've been told would be totally useless as a single and in fact way too big, I was thinking about a bandpass cab that would fill in 30-60Hz ish.

How reliable are the WinISD simulations for 4th/6th order cabs? and is there much more to port design than just checking the air velocity?

I've whipped up something over the bank holiday shown below, any issues I'm not aware of? Or any other suggestions?

Thanks,

Robyn

I've actually got a tune I'm thinking of where the FTH12 just can't hit the low note

Jebimasta wrote: If not, then I could have a smaller more flexible sub with slightly less output, maybe I'll try both!  Just seen that post properly. looks like a much better way to go :)

The LAB12 is not the most sensitive speaker as it is and tuning it low is perfectly possible with it's T/S specs, but you loose big time in sensitivity and run real fast into Xmax.
For strictly home cinema duty it would make perfect sense to do it like that, because SPL needs aren't that high and solid 25-30Hz respons has meaning there.

Jebimasta wrote: I wonder if I could find anywhere to hide a 314 litre cab... Upholster the top and turn it into a bay window reading seat!

Two seperate ~157 liter single speaker cabs might be more manageable ?

Thanks for the advice, I'll have a play tonight.

Instead I put one to use in a reflex box, 100l to go with a 5.1 surround system.

Edit: thought so!

https://forum.speakerplans.com/arts-dual-lab-12_topic99080.html" rel="nofollow - https://forum.speakerplans.com/arts-dual-lab-12_topic99080.html

I got a plunge saw recently and that made my build so much easier, the sub was built in an afternoon. 

Tempted to make more but I've run out of space 

Dual 21"? I don't see the connection.

Mega ports he's got going on too, makes me wonder about the design process, ports that large for me end up a mile long?! 100l net but 150l sized box to fit the port sort of thing

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.