ohh what to do with 24 xls subs

[CCU]

Originally posted by tb46
Hi CCU,

They always have in the past. :-) You would have to define the general parameters like size and form factor, as well as frequency band. I really like the dual driver tapped horn as in the previous reference.

Regards,

The responce curve look very promising, about 6Db more at 20hz when comperred to a vented box with 4 drivers and the same size

will definetly consider this option! plus the crown XTI amp can do some EQ on those spikes

[tb46]

Hi CCU,

Here is one more model with slightly reduced low frequency extension, and a smaller volume.

Regards,

[tb46]

Hi CCU,

In Post #21 you are comparing the dual tapped horn to a vented box with 4 drivers. When you look at a tapped horn with 4 drivers you get an idea of how much output can be generated with this design. It also gives you an idea what two dual tapped horn would be producing. I'll attach a hornresp SPL response comparing a maximum input line with a more reasonable line representing 125W into each speaker. Whenever I look at tapped horns I'm still amazed. The only "problem" for you would be, that you would really not need more than 4 of your drivers to reach an SPL level that is nicely excessive.

Regards,

[dave_gerecke]

Ok, here's another thought, two cabinets, 12 drivers in each. But here is where it gets different. 6 of the drivers are used as regular subs, the other six are wired up so that the voice coil has a resistor across it. Then you are using the other six drivers as passive radiators. And since you won't get the resistor value for wiring across the passives voice coils, you can run the voice coils out to binding posts on the back so that you can try different resistors to adjust the damping.
Oh and in regards to the bass out of any setup with that amount of subs in that kind of room volume

Peace,

Dave

P.S. you may want to wear adult diapers when running the subs at high volume.

[cowanaudio]

G'day Dave

And the passives you'll end up with will be very lossy and tuned way too high. Diapers definitely not required for this one....

I'd do IB or TH. With this much displacement even sealed is a viable option. I run 8 12" XXLS drivers sealed in my system and don't crave for more bass. I have a bit more power available though, in a QSC PLX3602.

Cheers

William Cowan

[bjorno]

Hi CCU,

My suggestion is to build: Dual Peerless 830452 fs tuned in a 39.4 L stuffed T-TQWT (Tapped Tapered Quarter Wave Tube), resulting in high compression in front of the dual drivers? Yes but SQ will IME peak too.

b

1(1)

[mayhem13]

I would built two towers with 12 drivers in each stacked six high push-pull with the rear drivers back loaded and wired out of phase with the fronts. Each push-pull pair would be in it's own chamber of 16L each. I'd make a hamster cage bracing system with 1/2 diameter wooden dowels running front to rear on center with each drivers mounting points. The area between the two drivers would be void and the area outside of the 'cage' would be heavily stuffed. A Behringer BFD in manual parametric mode would be used as well. Just my 2 Cents. Clean, flat in room response to 20hz and then some with room gain........It would look fantastic as well.

[CCU]

Originally posted by mayhem13
I would built two towers with 12 drivers in each stacked six high push-pull with the rear drivers back loaded and wired out of phase with the fronts. Each push-pull pair would be in it's own chamber of 16L each. I'd make a hamster cage bracing system with 1/2 diameter wooden dowels running front to rear on center with each drivers mounting points. The area between the two drivers would be void and the area outside of the 'cage' would be heavily stuffed. A Behringer BFD in manual parametric mode would be used as well. Just my 2 Cents. Clean, flat in room response to 20hz and then some with room gain........It would look fantastic as well.

Sounds interesting, but what is a hamster cage bracing? pics?


Must admit that i a very excited about the tapped horn, but mostly because of the efficiency and one last thing...

THANK you all for your suggestions, now i have to do some thinking and I'll come back and post some images later

and post other ideas if you get sudden burst of genies

[mayhem13]

With all of those drivers, why sacrifice efficiency in numbers for big box horns? Let the drivers do the work in the alignment with the best transient response and cancelled box resonance and even order HD. Although exotic technologies seem tempting, in your case with all of that available hardware, Occum's Razor applies IMO. With that many drivers, you could even do a dipole array with extension into the 20hz range with the proper amaount of PeQ. When so readilyy available i'd take SQ over efficiency any day of the week.

Hamster cage bracing would be front to back bracing members that lined up on center with the drivers mounting points extending from the inside of the front baffle to the inside of the rear of the enclosure which in this case would also be a baffle holding the back loaded driver. The mounting hardware of both drivers is driven ito the center of the bracing, creating a cage and a very stable enclosure. With stuffing outside of the cones direct line of fire on eachother, maximum HD cancellation occurs at the shortest wavelengths available, while reflex forces are dispersed through the surrounding fill, exchanging heat and effectively lowering Fb still.

Try one box as an experiment with two of the drivers and see for yourself. When modeling the enclosure size, double the Vas of a single driver and model as such. Output will be roughly 3db above the predicted output of the model with a single driver.