ok so I have an old style 18" BTL w/ pchamf, hixmax coil, and 3rd mag..

i want to upgrade and have 2 18" BTLs but as you know they do not offer those options any more and Fi will not make me one with those options, already spoke to them..

if I buy a new style BTL with the newer motor and put it in the same box with my current BTL would that be ok? how will it sound if any one has done it ? and will i damage my sub?

Thanks to everyone in advance, ****ty situation i really dont wanna have to sell this one and buy 2 new ones..

Not a good idea. Either buy another one just like yours or sell it and buy two new ones.

seems almost impossible to find one with the same options as mine and be an 18...

so shitty they had to change it.. gonna cost me so much extra money

whoa whoa whoa....shared chamber? I mean really I don't see why it would matter, M5 I don't doubt you though, I know you know your stuff, but I have seen setups with with completely different woofers sharing same enclosure, even same amp, which I wouldn't really suggest doing, but it did work. and in this case, they really do perform quite closely, newer version just has a different approach at motor stability with the magnet. since it is a high-powered system and there is a lot of pressure in the enclosure, I would recommend seperate chambers for the woofers, and seperate amp for each, but I other than that should work just great.

whoa whoa whoa....shared chamber? I mean really I don't see why it would matter, M5 I don't doubt you though, I know you know your stuff, but I have seen setups with with completely different woofers sharing same enclosure, even same amp, which I wouldn't really suggest doing, but it did work. and in this case, they really do perform quite closely, newer version just has a different approach at motor stability with the magnet. since it is a high-powered system and there is a lot of pressure in the enclosure, I would recommend seperate chambers for the woofers, and seperate amp for each, but I other than that should work just great.

a little bit off the shoulders hearing that, i was thinkin the same thing about shared chambers being a bad idea and the same amp, i guesss my biggest problem is i just wanted to keep my same amp (for cost reasons) and drop it to 1 ohm to run the 2 BTLs at 2000w RMS each and each in about 7cubes at 31hz.. i dont know how the amp will divide up the power evenly between two different motor designs.. or if it will be safe at all..

thing is i want to go louder and spend as little money as possible lol as most people do, the design change is killing me even if it was for the better of the woofer...

whoa whoa whoa....shared chamber? I mean really I don't see why it would matter, M5 I don't doubt you though, I know you know your stuff, but I have seen setups with with completely different woofers sharing same enclosure, even same amp, which I wouldn't really suggest doing, but it did work. and in this case, they really do perform quite closely, newer version just has a different approach at motor stability with the magnet. since it is a high-powered system and there is a lot of pressure in the enclosure, I would recommend seperate chambers for the woofers, and seperate amp for each, but I other than that should work just great.

Perform similarly? Do you understand T/S parameters and ANY of their effects on a sub? While their goals are similar the buck stops there. They aren't really comparable drivers and surely will not have near identical output across the board. In general it is just as bad of an idea as it is to run a 15" and 18" BTL in the same car.

Don't do it...baaaaaaaaaaaaaaaaaaaad idea.

It's like putting diesel in a gasoline motor..it might work for a bit but it is damn sure not going to be effective.

whoa whoa whoa....shared chamber? I mean really I don't see why it would matter, M5 I don't doubt you though, I know you know your stuff, but I have seen setups with with completely different woofers sharing same enclosure, even same amp, which I wouldn't really suggest doing, but it did work. and in this case, they really do perform quite closely, newer version just has a different approach at motor stability with the magnet. since it is a high-powered system and there is a lot of pressure in the enclosure, I would recommend seperate chambers for the woofers, and seperate amp for each, but I other than that should work just great.

Perform similarly? Do you understand T/S parameters and ANY of their effects on a sub? While their goals are similar the buck stops there. They aren't really comparable drivers and surely will not have near identical output across the board. In general it is just as bad of an idea as it is to run a 15" and 18" BTL in the same car.

I didn't say I recommended it. And I def. wouldn't use same amp, didn't realize OP was trying to do that. I understand it's not optimal, but what is so bad about running on a different amp in a seperate chamber?

and yes, I have a very good understaning of T/S parameters. I understand the motors work very differently on both woofers, but I have yet to see that they perform so much differently. it's not like everyone who was running old BTL had to switch to the new one and just from that gained any sort of reasonable increase in Db's. and they are def. not anymore musical.

Yes, as i thought I made clear, performance wouldn't be the same as if both woofers are the same, but if ran by seperate amps in seperate chambers, how will the this hurt the equipment? and what will be the tragic result?

I'm really just trying to learn something here, I don't consider myself a "know it all" so teach me!

Same reason you wouldn't run two different other drivers.

difference in soundwave movements, resulting in cancellation? same as two different sized drivers....that really makes sense, but running a 12 and a 18 next to each other doesn't damage one another either.

The parameters are significantly different..

If parameters are different then response curve is different...

ie: Cancellation.

Bad idea..

The parameters are significantly different..

If parameters are different then response curve is different...

ie: Cancellation.

Bad idea..

damn so dissapointing.. lol

some one sell me and old BTL ! haha