I tried to mount an Altec 291B driver to a Mantaray 594II horn and to much surpise, the holes don't match up. The Horn has "blanks" or fake holes where the bolts are on the 291's. Are these there to be drilled out? or do i need some sort of adapter?
Thanks-
altec 594II.jpg
You need an adapter plate. It's a flat metal plate drilled for both the bolt patterns.
The indentations are for the nuts holding the driver to the plate, which then bolts to the horn.
The horn in this auction has one.
Altec MR II 564 Mantaray Horn #3 with Mounting BRKT For 288/290/291/906 Drivers | eBay
If you can't find a pair the bolt hole dimensions are in this thread, a machine shop should be able to make them. They show up on eBay often.
Looking for a pair of Altec 30166 throat
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Got it and thank you.Originally Posted by Old Guy
Adding anything to the transition is probably not good or at least requires some care . Are there any "tricks" to making a seamless driver/horn transition when using adapters/plates?
If you look carefully at your 594 horn, you will see that it is made in 3 pieces which are then glued together. The adapter plate is absolutely essential to carry the physical weight and stresses created by the mass of a 288/291/299 driver. Keep this in mind when mounting.
I would defer to this thread that you need the bracket with four studs welded to it: The 25544 Adapter/35626 Bracket, Now I Get It
Here's my MR II-594 story in pics:
No studs in the 291's, short bolts are used instead. Studs are too long for the pockets in the horn flange i think.
Last edited by bowtie427ss; January 14th, 2018 at 02:33 PM.
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