need an 18

[Matthew]

ok i need an 18 inch driver with the following features if anyone knows a model aou there, please tell me?

-diameter of 18 inches,
-voice coil diameter of 4 inches,
-foam surround,
-long excursion,
-suitable for sealed enclosure,
-sensitivity of approx 90dB,
-large magnet,
-down to 20Hz,

if anyone knows a model fitting these requirements, please tell me? cheers!

 

[GRollins]

Matthew,
I'm not aware of a hi-fi driver that fits all those parameters, although I've seen a number of 10's, 12's & a few 15's. If you're set on an 18, you might try 'pro' bass or PA drivers, but don't count on finding a foam surround in a pro driver.
Why on earth do you want a foam surround, anyway? They rot out after about 8-10 years...not a good long term solution. They always say,"Oh, *our* drivers won't rot." But when the drivers croak later on, the company is frequently gone. I can't count the number of times I've seen this happen, including once to myself.
One of the currently popular sub drivers (Shiva? I forget which.) has a foam surround; there are lots of little 12" time bombs scattered across the country...
Caveat emptor.

Grey

 

[Claus]

Give RCF a shoot. They have some large diameter longstroke woofers. And they are not that expensiv

Claus

 

[Thoth]

Check out 'http://www.snippets.org/ldsg/sect-8-woofs.php3#WOOF-15+'. You'll have to scroll down to the 18" drivers, but there are quite a few choices; there are even a couple of 22" and a 24" driver. These are GOOD drivers, recommended by speaker builders (see 'http://www.snippets.org/ldsg' for more info).

Good luck.

 

[GRollins]

Thoth,
You've put a bright spot in my day...thanks. I thought Hartley was gone, but if that link is to be believed, they're alive and well.
Matthew,
You could do worse than a Hartley 24"...(okay, okay, or an 18"). And it's got a rubber surround, too.

Grey