What is XBL^2?

[sundownz Pro Seller]

Indeed, all true at rest by T/S specs.

I am wondering about dynamic parameters w/ power applied. My thought is that XBL^2 would be more efficient with greater greater power applied vs, lets say, a sub with a higher at rest BL -- something like a DD 9500 series. Say... we used the same magnet stack and changed the top plate around to keep the same coil, only made it XBL^2. Maybe I'll fool around with that a bit later and see what happens!

Any predictions? My initial thought is that the XBL^2 design would likely handle itself much better at 15mm+ of travel, likely having much higher BL than the "regular" motor (I'll use something big like the DD 9500 motor) at levels of travel that high. It's "dynamic sensitivity" so to speak, or if you measured T/S with the cone sitting @ 15mm of x-max and calculated sensitivity... would probably be higher. What do you think?

Interesting stuff to talk about at least //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[teamquakecelica 10+ year member]

XBL dun got more watts.... it work by inverting flux capacitor and using Wolf Dangling Diodes in intermodulation if me type write

 

[ngsm13 5,000+ posts]

Check out Neil's write-up...

Very informative, and easy to read.

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=9421

nG

 

[newusername 10+ year member]

Indeed, all true at rest by T/S specs.
I am wondering about dynamic parameters w/ power applied. My thought is that XBL^2 would be more efficient with greater greater power applied vs, lets say, a sub with a higher at rest BL -- something like a DD 9500 series.

If it weren't for that short coil, it's quite possible.

Any predictions? My initial thought is that the XBL^2 design would likely handle itself much better at 15mm+ of travel, likely having much higher BL than the "regular" motor (I'll use something big like the DD 9500 motor) at levels of travel that high. It's "dynamic sensitivity" so to speak, or if you measured T/S with the cone sitting @ 15mm of x-max and calculated sensitivity... would probably be higher. What do you think?

Pretty much bang on there. The thing that DD can cling to, though, is that it is more efficient under 15mm, which is a big deal when you're throwing in a helmholtz resonator with a resonant frequency of 30 Hz or more. Stroke is relatively limited and the electrical damping is there to really exploit what the port (or perhaps passive radiator) can do.

 

[dB Dom 10+ year member]

Check out Neil's write-up...
Very informative, and easy to read.

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=9421

nG

Oh ok, because I didnt catch the link 6 posts up.

 

[ngsm13 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/crying.gif.ec0ebefe590df0251476573bc49e46d8.gif

Only read the first 10 or so posts, and didn't see it. And that thread on SSA was the first thing that popped into my mind when I saw this title...

Die?

nG

 

[newusername 10+ year member]

In a fire, probably.

 

[sundownz Pro Seller]

If it weren't for that short coil, it's quite possible.
Pretty much bang on there. The thing that DD can cling to, though, is that it is more efficient under 15mm, which is a big deal when you're throwing in a helmholtz resonator with a resonant frequency of 30 Hz or more. Stroke is relatively limited and the electrical damping is there to really exploit what the port (or perhaps passive radiator) can do.

The DD 9500 coil is actually quite small, I was surprised at how short it is. Only the cooling keeps it together under massive power -- it's a "barely overhung" motor. It is shorter than the 2002 - 2005 RE XXX coil IIRC.

If you recall I talked to you about something along the lines of where this is going, I'll test and find out when the time comes if it works //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[azbass 5,000+ posts]

Check out Neil's write-up...
Very informative, and easy to read.

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=9421

nG

you got a little XBL^2 on your face you might wana wipe off. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[newusername 10+ year member]

The DD 9500 coil is actually quite small, I was surprised at how short it is. Only the cooling keeps it together under massive power -- it's a "barely overhung" motor. It is shorter than the 2002 - 2005 RE XXX coil IIRC.
If you recall I talked to you about something along the lines of where this is going, I'll test and find out when the time comes if it works //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Actually, I do remember something along those lines. And I remember Chad Hicks mentioning that DD has pretty small coils. Must be those glues. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[B_Campbell 10+ year member]

is the critical mass ul12 the only sub that uses mmag technology?

 

[newusername 10+ year member]

It's the only one I know of for sure, but that doesn't mean much.

 

[bdawson72 5,000+ posts]

bdawson72 , Brian Owens , NDMstang65 , PwnMaster

I see you two

 

[W8 a minute 10+ year member]

Great write up.

I thought RE was using XBL^2 back in the day but your article tells me it was split coil. Learn something new all the time.

 

[sundownz Pro Seller]

Great write up.
I thought RE was using XBL^2 back in the day but your article tells me it was split coil. Learn something new all the time.

The old XXX was XBL^2 -- the new XXX is split-coil //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif