will an x-tro comfortably meet a LAB horn?

thanks for your help walt, I suppose what I need is a 15 inch kick bin to go between 90 and 350. The purpose of this is to use an 8inch and 1 inch combination. If I use an HD215 or USB I'd need a 12 and a 1.5"/2" combo with their associated problems as the fold limits the lowpass. I find it strange that there is no current design specifically for this kick region. I feel that the HD15 and the other bp horns are compromised by the fact that under some circumstances they are used on there own for the full bass range and so wont allow the 350hz cutoff that you achieved with the xtro.

Do you have any comments on whether stretching the upper crossover of the selenium is a good idea or what modifications I should look for when increasing the mouth area of the xtro double 15 section to make it more efficient in its own cabinet?

I think changing the horn geometry is already out of my capability without a lot of trial an error, something which I certainly don't have time for at the moment, going into my final year of an engineering degree.

My idea was to reorientate the drivers so that they were both vertical in the cabinet and keep the front and rear chamber identical (using the original specced 18sound driver). If I was then to increase the mouth area of the horn to the full height of the baffle, how long would the horn have to be to maintain a sub 90Hz -3db point, as drawn badly bellow. The 2 other dimensions are the ones which I'd also need to change.

http://img3.freeimagehosting.net/image.php?2eea78b298.jpg



presumably if I maintained certain parameters like compression ratio and flare rate the sound of the horn would not be too affected?


Edited by biotec - 09 August 2006 at 11:28am

Walt.. I am very interested in the double 15 straight horn cab you posted above. I think quite a few of us here are looking for something along those lines. Any chance of plans..and even better some discussion on possible improvements/specific characteristics?

Hello,

Edited by Contour - 13 August 2006 at 12:34pm

All this talk about resigning the Xtro and splitting it up to avoid comb filtering, why not simply angle the 8" and compression drivers and have a specific left and right driver for each stack? If you were really clever you could even construct some sort of adjustable system where you could angle the drivers as required.

Please read back on my posts, I have explained somewhere why such a design will not work without some modicifations.