Any xbl^2 subs that are 2500-3000 rms?

[grimreper912003 5,000+ posts]

If you do that haven't you just created another generic high power handing woofer?

Somewhat, but the motor would still be XBL^2 lol //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

But isnt the point the XBL^2, and underhung coil that yeilds a flat BL curve and an overall even frequency response?

Why do you need to throw a big *** coil in it? I love high powered subs but I choose my motors accordingly //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[bose301s 5,000+ posts]

If the stock coil is roundwire you might increase thermal power handeling by using an edge or flat wound coil.. but you'd never reach the levels the OP is asking about without changing the wind width (which would mess up the XBL^2)

I'm assuming you mean wind height here.

 

[audioholic 5,000+ posts]

And I thought we were discussing rated power handling, not guesses as to what modified subs would handle.

If you have 3kw and simply want to power an xbl^2 setup with it, just get two smaller old XXX's, Brahma's, SDX's, etc. Three very nice subs there. Id also consider the GTi, which is not xbl^2, but is BL optimized to create similar results. Two of these in smaller version subs on that much power would likely perform better than one larger one anyway.

Thanks bose301, I was thinking UL's were MMAG, but was too lazy to look it up.

 

[RAM_Designs 5,000+ posts]

x2 to getting a pair of GTi's or SDX's....those both sound amazing with around 1kw each.

 

[audioholic 5,000+ posts]

x2 to getting a pair of GTi's or SDX's....those both sound amazing with around 1kw each.

Yep, Brahma's also for that power range. If bumping it up to 1500 watts per, Id look more towards the old xxx's, or GTi's still.

 

[tc3k101 5,000+ posts]

Why?

 

[hrtbrk1 5,000+ posts]

oh ok i never knew the ul12 was different...yeah i guess old re xxx were pretty good xbl^2

 

[bose301s 5,000+ posts]

I actuall really want to try the DIYCable Shiva-X2, very high on my list of subs to try.

 

[Toxic Tuan 10+ year member]

I'm going to throw my thoughts out there for you to consider:

XBL^2 technology offers a flat BL curve with the trade off of motor strength. Realistically, most XBL^2 motors driven to it's limits will loose the benefits of flat BL. If you ever noticed, the more power you put to most XBL^2 subs, the less accurate it becomes and offen more "muddy." At powers such as a 2500 watts on a single driver, it's better to go with a LMT, dual coil/split coil, or a lower mms driver. The results are much better than XBL^2 in my honest opinion.

The older XBL^2 XXX woofer was good, but I really didn't like how it sounded from 1000 watts plus and there was nothing that I could have done with the enclosure to compensate. My recommendation is getting yourself a DD9500 and allow it to be in an enclosure that was meant for and you'll get a flat response all the way across even at 2500 watts RMS. I'm done it numerous times and it's won SQ competitions just to give an example.

My 2 cents.

Tuan

 

[Electrodynamic 10+ year member]

If you modify the winding length (I think that's what you meant Hauz) without modifying the motor, you'll have a very weird looking BL curve that would negate the desire to have XBL^2.

There are designs out there that utilize XBL^2 that will handle 2k watts with ease. Take a look at this sub. However, it's no available for sale to individuals, only company's.

Power handling has to do primarily with extracting heat away from the voice coil. The size of the coil plays a part in power handling, but not as much as getting heat away from the coil. The XBL^2 sub above manages a rated 2000 watts RMS power handling with a small 22.5mm winding height.

 

[audioholic 5,000+ posts]

I'm going to throw my thoughts out there for you to consider:
XBL^2 technology offers a flat BL curve with the trade off of motor strength. Realistically, most XBL^2 motors driven to it's limits will loose the benefits of flat BL. If you ever noticed, the more power you put to most XBL^2 subs, the less accurate it becomes and offen more "muddy." At powers such as a 2500 watts on a single driver, it's better to go with a LMT, dual coil/split coil, or a lower mms driver. The results are much better than XBL^2 in my honest opinion.

The older XBL^2 XXX woofer was good, but I really didn't like how it sounded from 1000 watts plus and there was nothing that I could have done with the enclosure to compensate. My recommendation is getting yourself a DD9500 and allow it to be in an enclosure that was meant for and you'll get a flat response all the way across even at 2500 watts RMS. I'm done it numerous times and it's won SQ competitions just to give an example.

My 2 cents.

Tuan

The flat BL curve says otherwise. Perhaps you had issues with suspension noise?

 

[hotcress 10+ year member]

I've got one of these and they are suppost to be good for the amount of power you want to feed them. They are not xbl^2. But they are bl optimised ... which is the goal of xbl^2 drivers. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=293-620

I haven't given it the full 2500 yet. But it taking a good 1100-1200 and I'm good. Pretty high output and very, very clean sounding.

 

[Toxic Tuan 10+ year member]

The flat BL curve says otherwise. Perhaps you had issues with suspension noise?

That's what I would assume since it's supposed to be a flat BL curve all the way across. At higher power it wasn't so flat. I'm not sure if the noise was from the suspension or something else. Most of the people that I knew noticed the same issue. It's unfortunate I don't have an older xxx laying around to retest this isssue. I'll try to find one.

Tuan

 

[T3mpest 10+ year member]

That's what I would assume since it's supposed to be a flat BL curve all the way across. At higher power it wasn't so flat. I'm not sure if the noise was from the suspension or something else. Most of the people that I knew noticed the same issue. It's unfortunate I don't have an older xxx laying around to retest this isssue. I'll try to find one.
Tuan

According to Dan the lack of the shifting BL keeps the sub with a consant overall q which doesn't occur in typical designs which have a rising q as excursion increases. Perhaps that was the issue you had with the xxx? Suspension noise might be the other issue, I know my AA avalanche had some noise before 27mm although you couldn't hear it from inside the car. The other major issue I can see being the issue on a xxx is flux modulation. They used a pretty big coil on those and took no attempts at keeping the inductance down, which is why they dont' play anything over 60hz very well at all. Regardless when we look at things in the current domain, the XXX probably isn't as pretty as it looks on paper. The newer model shiva and tempest x's both use faraday rings to keep inductance and inductance variation with stroke even. The motors are also dead quiet under full excursion or so I've been told. Since you like playing with subs tuan, why not try a more updated XBL^2 design?

 

[audioholic 5,000+ posts]

That's what I would assume since it's supposed to be a flat BL curve all the way across. At higher power it wasn't so flat. I'm not sure if the noise was from the suspension or something else. Most of the people that I knew noticed the same issue. It's unfortunate I don't have an older xxx laying around to retest this isssue. I'll try to find one.
Tuan

The only noise Ive heard from a XXX at higher excursion levels was tinsel slap. Ive never heard one inverted though, which would certainly make suspension noise more noticeable.
The motor design pretty much guarantees the BL force was still flat even at high excursion. So it had to be a noise from something else. But then, BL distortion sounds a lot different than mechanical/suspension noise, and I know you have a lot of experience, so Im a bit confused.

Cheers.