Ariel cabinet question

[andrew01]

Hi,
I want to build the Ariel but looking at the drawing for the version 6c (the latest) , it looks very complicated & difficult to build.
I was wondering if anyone has designed a more simple to build version of this TL , maybe more like the Thor.

Thanks

Andrew

 

[lufbramatt]

that subject was discussed in this thread: http://www.diyaudio.com/forums/showthread.php?s=&threadid=37921&highlight= near the end somewhere the cabinet was redesigned to be much simpler, dont know if it was ever built though,

matto

 

[andrew01]

Thanks for that .
I found the design of a MLTL on page 5 which sounds like what I'm after.
I have some newbie questions :

Can someone explain why this is a TL ? It looks like a Bass Reflex box to me ?
Will it not behave as a BR box ?
Does stuffing the top half change the behaviour from a BR to TL ?
Doesn't it need an internal *board* to be a TL ?

Thanks

 

[Scottmoose]

Ah. That's the MLTL I came up with.

No, no and no to the three questions! ;-)

OK, so that's not too helpful. See www.quarter-wave.com for the theory. Basically, don't mistake the appearance of a box for its function. A 'TL' (rotten name, an electrical term really, but we'll leave that to one side) is designed to use the 1/4 wavelength responance of a cabinet to reinforce the low frequencies. That's it. You can have a wide top, narrow end, a narrow top, wide end, or a completely straight enclosure. Straight ones 9 times out of 10 work better than tapered. The port in the bottom is to provide an additional load on the 1/4 wave resonances generated by the cabinet. It allows a given enclosure size to go much lower than one which simply terminated in free-space, and also damps much of the unwanted higher harmonic resonances generated by the enclosure, which have been a bane of QWRs for decades, allowing much lighter stuffing (a good thing). That's what the stuffing in any QWR should be for: to damp out the higher harmonics that cannot be otherwise engineered out of the enclosure.

Hope that helps a bit
Cheers
Scott

 

[andrew01]

Thanks sir,
I was gonna build a Thor but the cost of the drivers alone was to be over $AU2000.........so might build the Ariel instead.

 

[Scottmoose]

Ariel is probably a better speaker anyway. Thor has inumerable problems as it stands. You could try the MLTL version of Ariel if the complexity puts you off. Easier and cheaper to build, goes just as low, if not lower, and should preserve the midrange Ariel is justly famous for.

Regads
Scott