My big ten inch ---ALTEC 756B

[Geekstar]

In the cone pic above, you can see where my cat tried to climb up the plastic blinds after I chased him from climbing onto the 756B! If you read about my 728B tragedy in the "755A value" thread, you will understand why I am paranoid! Something about that big belly button dust cap really lures in cats.

Here are a few more pics. The 756B uses a fabric rear vent cover like the WE/Altec 755A rather than a metal cover as found in the 728B (pictured) and the WE 756A.

The tag on the 728B cord gives the specs for all of the 700 series cones. 2.5 cu.ft. for the 756A. I took the 2 cu.ft. 618 box dimensions and added a few horizontal inches to reach 2.5' cube. The 756 cabinet is pictured atop my factory 618 cabinet.

I modeled the driver position on the baffle in software and while I could cause all sorts of small amplitude wiggles by moving it around, I could not find a better position than the one I used, which is quite close to the cone edge-top baffle edge dimension of the 618.

I understand that it is a very dubious proposition to rear mount a driver with a 5/8" baffle due to cavity resonance issues and all that. Back in the 80s, I tried front mounting and rear mounting 755As. I actually preferred the more open sound of front mounting but the rear mount did something cool also. Gave a more hearty and weighty sound. Here I just went with the classic. I'll probably also put screens over the cones like the 618 to protect them from feline attacks.

Too humid to paint right now. I'm torn between black nitro lacquer and old school gray. Maybe John Deere green?

One weird thing on the driver in the pictures is that there are two heavy gauge wires coming out of a hole on the side of the AlNiCo doughnut magnet. I think these were used in the charging process. I have dim memories of seeing this before on really old 728s but I don't think the other 756B has it. Already sealed up that cab with 12 screws and I'm too lazy to check! Plus I'm ready to rock and roll in 756B STEREO tonight!! YEE-HAH!

Yesterday, I did some very interesting surround goop rejuvenating experiments which I will relate in a separate thread.