I just received the usual daily dose of emails. Among them was a cool driver from Parts Express. It's their ES180TiA-8 model. Funny thing is that they use the same sized basket as I do. And I never considered my offering as a 7 inch driver. But upon taking a tape measure to the prototype basket in a nearby shelf I find it to be almost 7 1/8th inches in outside diameter. I squeeze a bit more Sd out the basket than did the engineer who designed it for Parts Express as I have the basket machined in strategic places to allow what I am looking for in terms of clearances. The basket is a very beefy design that has a great deal of potential. And I get a great surface area because the surround I use is custom designed for the sole purpose of a clean response and a long excursion. On that topic of surround for a clean response, I'm actually looking into making a double s type surround as well. It offers some further benefits in the higher frequency range.
Right now the surround we are using has a few applications of mass loading and dampening that have turned this driver into a clean mean pumping machine. ( oh yeah took me at least 30 seconds to think that one through! )
Displacement is one thing. But having a clean easy to listen to midrange is really the goal in a driver size like this. And an enormous amount of time on the design end was applied to making it so. Looking forward to the new batch coming. We are using the same custom cone, and a retooled surround to take advantage of the new motor's extra available excursion.
So maybe I should rename the KA6.5 as a KA7?
The 8 is actually larger than 8 inches to. Man all my model numbers are now out the door.
Well off to start the tractor. Winter is still here in Ontario. And we just received a nice dump of snow. So time to clear away all 250 cm or 10 inches of the fluffy stuff.
Mark's Ramblings, show and tell. And other sundries.