6th order BP kick section

Hi!

I have been busy with some sketchup ideas. I'm trying to make a kick sectionin for the porn horn V2 in the box with a 15" 6th order bandpass.
There would be 2 ports one above the HF horn and one under the MF horn. The front and rear chamber would be seperate between the two horns. I was planing to place the tunings around 70 and 130hz the maximal volumes availible are around 25L for the hi tuning and 65L for the low tuning. The exact volumes I don't know because I don't have the porn yet. I'm gonna use drivers from RCF or B&C.  Would port turbolance affect the HF response since the port is above the horn? 
I know  designing a 6th order BP is not gonna be easy I dont have much experiance designing 6th order BP so any help would be appreciated.
I have simulated a bunch of drivers with winisd but I don't know what TS parameters to look for for a good 6th order BP.
The porns would go above LABhorns so a 90hz cut max. I could also built some USBs but I want to have things in one box and as compact as possible.

Here some images for better understanding







Edited by lukam - 13 February 2010 at 6:36pm

Definitely interesting.

>How about a BPH aka HD15 section under the 12" section?
We assume that he wants to keep the size of the porn horn to its normal size and just use unused space.

I don't see why this couldn't work.
The correct driver is going to be key.  Estimate the amount of space you have and find the highest SPL driver that will work for the space.

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FlipC wrote: We assume that he wants to keep the size of the porn horn to its normal size and just use unused space. I don't see why this couldn't work. The correct driver is going to be key.  Estimate the amount of space you have and find the highest SPL driver that will work for the space.

Exactly!

I'm trying to make the boxes as small as possible and use the unused space. I know that the driver selection is going to be the key.

So what driver do you think would be the best? One with heavier or lighter cones. I'm afraid that the cone will break if its to weak (lighter cones). Maybee a rcf LF15n401 or MB15N351. The MB would be more efficient but dont know what will happen with the cone at higher volumes.

When I get the horns and driver I have some measurement gear and will measure everything.
I have already some P.audio SN-12b lying here.

From what you say the B&C 15NW76 would be nice. FS 42, Qes 0,23, Qts 0,22, Vas 130L, Le 1,25mH and Xmax 8mm.
The simulation also looks good for rear chamber 60L at 70Hz and front chamber 20L at 140Hz. But measurements will tell.

I dont know what compression ratio you mean? For the porn horn I dont know. The porn horn plays down to 130Hz so I would cross over them around 130-160Hz must see. The low cut off for the bandpass would be arround 80Hz. I have 1000W availible to power the kick section.

I dont know how will a BP sound compared to a say USB, what you guys think?

Regards
Luka 

could another idea be to take the meyer aproach and relex load the rear chamber of the 12" section - they do this on the MSL4 to good effect, that runs down to 65Hz ewith just one 12" and 2" per cab

I've found light cones work well in 6BP that need to reach mid kick bass/mid bass frequencies. I used the 18sound 18ND930 in 6bp (light cone for an 18) and measured -3b 47hz - 136hz. Sounded good crossed at about 120hz.