DD 2508's Just Released!

[Bettr n' Revrse 5,000+ posts]

That's only 2" of spider on either side of the coil. Not diffing your driver, Im sure it performs well, Im simply saying that the basket for an 8" sub will be so small as to limit the spider landing size, which means you either have to keep the coil diameter relatively small, or lose some excursion potential.

O I know what your saying... But It is fun to go big and throwing 1500 at an 8 is awesome!

 

[i2ain2thunder 10+ year member]

O I know what your saying... But It is fun to go big and throwing 1500 at an 8 is awesome!

bah

At some point adding thermal handling is kinda futile and impractical when the mechanical limits are reached sooner, not to mention at some point power no longer does much to affect overall DB level.

 

[disturbed471985 5,000+ posts]

That basket screams cheap.. I will pass might be good but it looks like crap from top to bottom..

 

[Bettr n' Revrse 5,000+ posts]

bah
At some point adding thermal handling is kinda futile and impractical when the mechanical limits are reached sooner, not to mention at some point power no longer does much to affect overall DB level.

Never said it was the perfect 8 I said it was fun and thats the point of audio to be fun and do things no one else has...

 

[audioholic 5,000+ posts]

bah
At some point adding thermal handling is kinda futile and impractical when the mechanical limits are reached sooner, not to mention at some point power no longer does much to affect overall DB level.

I agree, but you also have to remember that mechanical limits are enclosure dependent. Just because you might reach mech limits before thermal in one enclosure or situation does not mean you always will. For example, SPL drivers that are designed to play at or near enclosure tuning will have their excursion minimized due to the damping force of the enclosure (but the enclosure's efficiency is at its peak, which is why SPL increases the closer you move towards enclosure tuning even though excursion decreases). So if you are building a driver that is intended to be placed in an SPL setup and burped in a vented enclosure that will work to keep excursion down, more BL force will help overcome this damping effect. So in such a situation thermal limits become as important, or in some cases more important, than mechanical limitations.

Ideally, an SPL competitor will balance the enclosure damping with the wattage available to reach full xmax while staying just below thermal limits. of course, this is also time dependent, and the length of the burp would also affect this. This is why some seemingly small rule difference such as an average of output over a 30 second burp, versus a maximum SPL reading within a 30 second time period, will drastically affect how the competitor sets up his install.

 

[i2ain2thunder 10+ year member]

good point holic...still can't wrap my head around the practicality of some of these subs though.

 

[SPLaudio 5,000+ posts]

the 8" better has i built using a 3" coil sub it lots of excursion actually more than anything on the market to date. 6.750" spider leaves plenty of room with a tall roll. most companys use a 5" spider with a 2 or 2.5" coil...

 

[wenn_du_weinst 10+ year member]

the 2500 is a 2.5'' coil

the 1500 is a 2''

 

[Dirtrider4eva 10+ year member]

Imo, for the price, the cheap basket needs a revamp heck of a motor on her.

 

[LiquidAudio]

the reason for the cast basket was cost, the 8 has exact same motor and everything the 10's do but they wanted to be in the right price point in the 8" category, small price to pay considering the 1508 destroys most 8" woofers in the same price point.

 

[THATpurpleKUSH 5,000+ posts]

All that $ and a stamped basket? No thanks. Its acceptable on the entry level series but it should stop there.

Its like a Morgan, you pay $100k for a v8 sports car but it still utilizes a wooden frame...gtfo

 

[Bettr n' Revrse 5,000+ posts]

Ya for being 50 bucks more then the new SA I'd expect a little better look to it...

 

---------- Post added at 12:41 PM ---------- Previous post was at 12:40 PM ----------

 

And as for my 8 I have a vid of it playing free air a bit I'll have to post...

 

[SPLaudio 5,000+ posts]

the price difference between the steel and cast is $5 who wouldnt pay that to have a better basket and larger dia spiders...

 

[Liquid Bass 10+ year member]

Typical dd charging twice the price for a ****** stamped basket you can find on a Pyle pro and soft parts made in Asia. How long will all you people keep buying this stuff lol?

 

[skylineTT 10+ year member]

the force of the cone moving (which is what I meant by speed) will increase db's. There is a very detailed paper out on this but I can't find it. DD's bl and xmax are far less then the lms but a 9518 will kill the lms in spl. Same goes for the 5200 vs the 9500. I'm sure you already know mass times acceleration = velocity, which is what dd uses to create high spl. Also I have snapped tons of 12 spokes with my sigs I think I still have 2 or 3 broken ones. Problem with stamped steel is some one new might not know that the basket is bent out of shape if he blows a sub do to coil rub, where a cast basket it's pretty obvious that it's broke. I won't support motors in my box or use bracing nothing that will interrupt airflow is allowed inside my enclosures.

Mass*Accel does NOT equal Velocity.

Mass*Accel = Force.

Mass*Velocity = Momentum.

Velocity = Distance/Time.