btl confusion

[wattsgoinon 1]

so i cant get a daily with the high xmax and cooling and all the best with copper coils? i though aluminum cant handle as much and if so if i went spl could i get all the best and still use it for the daily rms?

[Fi Car Audio 64]

No copper coils on the BTLs. All coils for the BTLs are aluminum. Copper would have too much weight with the coil size we use, and still wouldnt yield the specs I would want.

The "Fully Loaded" version which is what many consider the best... consists of the 3rd magnet, full cooling (which includes the pole chamfer), and the high Xmax coil. The SPL option is only for full on SPL only applications. We do not do it for fully loaded versions. And dont let the name fool you. The SPL option isnt always louder either. We have found that most daily and lower powered SPL applications benefit from the slight decrease in motor strength... and some ultra higher power SPL applications benefit from the increase tolerences when coils swell and want to lock up.

Please let me know if I can help/confuse anything else

Thanks,

Scott

[wattsgoinon 1]

scott didnt you use to work for tc sounds? either way i think im going to go with six of the fully loaded daily btl the 2on2 and run a crossfire vr4000d on ech one at 4 ohms that way it will only be puttin out 2000 that way i dont kill the subs and the amps will stay pretty cool as well. as far as the box i was kinda wondering if i should go big like 8 cubes per sub or smaller around the 5 cubes per sub. which would give me the best low frequency response and allow my subs to have a long life ahead of them. they are going into an astro panel van i havent decided ported or not yet. but also what should they be tuned at.

[Fi Car Audio 64]

Not TC I used to own RE Audio/DeStijl Engineering.

As for the VR4000D, Id get the dual 1 Ohm version and run them at 2 Ohms. With the 4000D being a 2Ohm stable amp, that would be your best bet. If you dont need or want the power, simply set the gains or volume knob accordingly. Makes more sense to do it that way so you "could" have the power if you wanted it as opposed to only having 2kW out of 4kW no matter what. The amps wont run any hotter if they arent making the power. But it gives you more control.

The next issue of enclosure volume vs bottom octave performance... the larger the enclosure, the more efficient it will be and the better it will produce the bottom end (if tuned for it). The flipside to this is the fact that it will reduce the mechanical power handling of the sub as well. Having a smaller airspiring behind the sub aids in controlling things under higher power applications. While they do work in 5 cuft and under (Steve Meade is proof of that), running 6 cuft or a little more for your application will net a little more efficiency and bottom end. I like tuning the fully loaded versions lower for daily... 33 Hz is a good tuning. Drops plenty deep and still hits hard. But, ported is the only way to go with the BTLs. Sealed would be awful... they simply arent designed for it and would be a monster midbass at that point with no bottom end at all.

Thanks,

Scott