416 clone in sealed enclosure

[Audio_by_Goodwill]

Old Guy: I taped off the back vent; the recone kit came with a vented dust cover.

I wonder if you could find an expandable rubber plug at the hardwares store? I would think that tape would give and move a bit like a cone.

[RonSSS]

So they used the GPA kit listed on their website? Speaker Exchange | Altec 416-8A DIY Recone Kit

That's very cool that you can buy all the stuff to put real cones in your self. With the spider pre attached. Anyone done this? I had all the parts from GPA, but sold them to one of our members some time ago. Along with the baskets. MattVandyke, not sure if he ever had them done or not.

ron

[Old Guy]

HI GM.


Old Guy: I taped off the back vent; the recone kit came with a vented dust cover.

Ah- then forget what I said. My only experience with one set reconed this way, a solid cap was substituted.

[les winter]

Maybe I'll put a piece of masonite. I'll report back. It will take some time. I'm tracking down a leak that's giving me a double hump impedance curve.

[Earl K]

Hi Earl.
I used the DATS system from Parts Express to make the measurements. I used the test box method for the Vas.
The recone kit came from the Speaker Exchange in Tampa.

Thanks Les ,

<> EarlK

[mattvandyke]

That's very cool that you can buy all the stuff to put real cones in your self. With the spider pre attached. Anyone done this? I had all the parts from GPA, but sold them to one of our members some time ago. Along with the baskets. MattVandyke, not sure if he ever had them done or not.

ron

Yes, I took the GPA speaker cones to a local speaker shop (JMAC) and had them done. They turned out well.

[RonSSS]

Good deal. I did the same with my 8c's. JMAC has done Altecs since I was a kid, Ron's father owned the shop then.

Ron

[les winter]

OK, so I got one of these monsters put together. Stuffed pretty well, the Q comes in at 0.75. Sounds pretty good in my shop.

The GPA 902 is a little hot. I need to pad it down a bit. I figure an lpad at the tweeter to be 4 ohms in series and 8 ohms across to give me a 6 db loss. Any other suggestions?
thanks.

[fpitas]

I'd go for a small amount of adjustment by using a variable resistor for the 4 ohms, or a fixed resistor in series with a variable resistor so you can tweak the horn level easily.

OK, so I got one of these monsters put together. Stuffed pretty well, the Q comes in at 0.75. Sounds pretty good in my shop.

The GPA 902 is a little hot. I need to pad it down a bit. I figure an lpad at the tweeter to be 4 ohms in series and 8 ohms across to give me a 6 db loss. Any other suggestions?
thanks.

[GM]

Normally a bypass cap around it is required to tonally balance it out in the extreme HF, though may be a waste in a shop app.

GM