2220a and LE75, What to build?

[mrquant]

No, the diaphragm is in the inside of the driver, you will have to remove the back side. But if the screws are sealed this is a collectors item and should not be opened. Can you send pics on the back side of the driver?

Mårten

Here you go. What did you learn from this?

[Horn Fanatic]

Here you go. What did you learn from this?

Only one seal is missing. If the driver works, I don't recommend taking it apart. more10 is right, vintage collectors frown on missing seals.

[more10]

One seal intact. How about the other driver? If they work you can sell them as a collectors item and buy a working pair of LE85 with original diaphgragms and also put some money in the bank. I guess they are a bit unusual so maybe you can get a good price.

LE85 have larger magnet and are therefore "better".

Mårten

[mrquant]

One seal intact. How about the other driver? If they work you can sell them as a collectors item and buy a working pair of LE85 with original diaphgragms and also put some money in the bank. I guess they are a bit unusual so maybe you can get a good price.

LE85 have larger magnet and are therefore "better".

Mårten

Good suggestion. If they are rare they should go to someone who cares about that.

[more10]

Good suggestion. If they are rare they should go to someone who cares about that.

Thanks :-)

Put a swap ad on the marketplace part of the forum. If you bargain hard maybe you can get a pair of horns and lenses as well :-). Swap only for LE85 or 2420 (pro version) with original working diaphragms in good shape.

[mrquant]

Sorry for the typo, I misread your post.

If you don't plan to use the acoustical lens, then the field is wide open as to choices of horns. I would stick with the exponential type, rather then a CD horn. CD horns have built in design problems, as Mark Ureda pointed out in an article he co-wrote on the ALTEC Mantaray horns. Phase coherency and upper frequency attenuation being two of them.

The JBL 2345 would be a good start, or the ALTEC 811 as Earl K suggested. I would prefer the 811 also. If you use the ALTEC you will need to drill a new hole pattern to mount JBL driver. The holes will be 30 degrees apart.

Is there something that should go between the horn and the driver? Like a gasket or silicone?

[4343]

Is there something that should go between the horn and the driver? Like a gasket or silicone?

Usually there is a hard gasket stuck to the face of the drivers. Usually gray. Not hard to make some out of a thin (1/16" or so) card stock or cork sheet. No glue or silicone...