I think those are HR-60's.

Vintage Electro Voice PA Horns with Adapters (2) | eBay
Horn_1.jpg
It's a screw on to 1.4 adapter...so are those drilled 3 bolt Altec 1.4? Look to be also 4 bolt EV pattern.
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I think those are HR-60's.
Not all vegetables make good leaders.
Looking at the EV spec sheets and the sellers measurements, that's correct....... which also means my HR90* is actually a 60. The 60 and 90 are actually fairly close in size, but the 90 looks more like my 120 in design, according to the drawings. I feel a bit embarrassed since now that I look at the horn and spec sheets, and see that the 60 and 90 degree angles are pretty obvious.
Can someone tell me why all the drivers seem to be screw on, and the horns are bolt on? I was looking at EV drivers on Ebay other other day and they all seem to be screw on. I was hoping to try out my HR horns after meeting Don Keele.
*Okay at one point I knew I had a 60 because I found where I was trying to sell it, and called it by it's correct model name.
Last edited by Audio_by_Goodwill; May 5th, 2012 at 12:08 PM.
Audio_by_Goodwill
Michigan, USA
My WAG is that's simply the standard they(EV) chose for small format mounting, the 1-3/8 x 18 thread is pretty much their standard like the 2 bolt Altec standard, and 3 bolt jbl standard for small format.
If we go back on the timeline, for a long time, the 6HD and 8HD were pretty much the only horns they offered aside from those re-entrant contraptions they used in the Georgian and Patrician. 8HD has been used by several other companies over the years too, lotta those suckers out there.
Not all vegetables make good leaders.
Audio_by_Goodwill
Michigan, USA
Re the horns in the OP, the flanges on the horns and throat are large format, and appear to be drilled for the two most common patterns, the 1.3/1.4 inch 3 bolt pattern which includes large format Altec, and the 4 bolt 2 inch throat pattern common for EV and JBL as well as others. The 1-3/8 x 18 thread mount is on the same flange of the adapters as the 2 and 3 bolt small format patterns.
Personally, i wouldn't use "those" adapters for bolt on drivers with true 1 inch throats. That land that is the blind bottom of the 1/3/8 threaded portion is a large reflective area that will direct HF energy directly back into the driver. Those adapters are best suited for use with threaded drivers.
Not all vegetables make good leaders.

EV did not make large format Drivers till the MF-1012 for Kustom mid to late 70's. Later sold as EV DH-1012 and Altec 906. Later a snout was added essentially a 1.4 to 2 inch adapter cast on, to create THE DH1a.
http://trade.mar.cx/US73061636
EV, Atlas, University- the 'second tier" manufacturers all used 1 3/8 screw on for small format.. Later Heppner, Gollehon , Cerwin Vega and others used that.
That horn was designed for the above mentioned Kustom/EV/Altec driver, had to have the adapter for the small format driver.
Last edited by Old Guy; May 5th, 2012 at 02:45 PM.
Your neighbors called. They like your music.
Does the snout function as simply a spacer/adapter, or does it play a role in the electromagnetics of the motor?
I've never thought of EV as being second tier. The era we're discussing is before my time, Though.EV, Atlas, University- the 'second tier" manufacturers all used 1 3/8 screw on for small format.. Later Heppner, Gollehon , Cerwin Vega and others used that.
Audio_by_Goodwill
Michigan, USA

EV was second tier traditionally. Closing down Altec and absorbing some products helped.
Old EV 15 woofs are JUNK compared to Altecs or JBL.
Politics of the time, JBL courted George Lucas, and got THX specs to call for a 2 inch driver. Since been changed.Ev just molded the adapter on. Actually it likely hurts the mag field.
Last edited by Old Guy; May 6th, 2012 at 06:04 PM.
Your neighbors called. They like your music.
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