Source for adapter 288 to 2" horn?

**gearfreak** · October 16th, 2012, 12:51 AM

Originally Posted by Geekstar

I never even unpacked them! I will tonight and provide pics/measurements.

Sweet, thanks! Whenever you get to it...

**Panomaniac** · October 17th, 2012, 08:49 PM

Oh! Jeez, what was I thinking?

**Geekstar** · October 17th, 2012, 11:17 PM

Wow...they were hard to find! Took me two days.

Of course, they were in plain sight...still in boxes, in use as feet for a Garrard 301 turntable I'm working on.

What a retard, huh?

This is for Martin Sound PC-5308

Small aperture is 1.5" not 1.4"!! 4 bolt pattern on 4" circle, look to take a 1/4" bolt.

Wide aperture is 2" 4 bolt pattern on 4" circle and the holes are THREADED. Shouldn't be a problem because most horns have bolt holes rather than captive threaded studs.

Not sure of thread gauge but a click or two down from 1/4"...maybe even metric!

Length of adapter is just under 2" so the flare rate is quite fast.

From the looks of these they would be more appropriate for EV 1.5" drivers than 288s, sadly.

**gearfreak** · October 18th, 2012, 11:52 AM

Excellent report, thanks!

Was considering drilling them out for 3-bolt, but then I've got to buy a working drill press (well, it'd be wise to), build a template (not bad) etc.
That's fine, but the 1.5", and a time constraint maybe tipped me the other way.

So I've anted up and ordered the $ 33710's off of ebay.
I'll take a look at the apertures with the digital caliper to see how they measure before bolting them up.

**gearfreak** · October 21st, 2012, 02:11 PM

Nice, machined units, nominally within 1/100th of 1.4 and 2.0 aperatures. Some pics...

**gearfreak** · November 2nd, 2012, 12:38 PM

Now, I've stumbled across the right martin, check it out:

M-3825 Adapter, converts a 2″ exit horn lens to accommodate a 1.4″ exit driver Martin Sound Pro

**Geekstar** · November 2nd, 2012, 01:03 PM

Hey, that looks an awful lot like the one I bought!

You might want to verify the actual size before ordering. I measure 1.5" on mine. Part number on the box was PC-5308.

Actually I checked the invoice and I supposedly got shipped M-5038, which is a 1" -->2" adapter.

I actually forget what I ordered (maybe I did order the 1"-->2") but they don't even list a 1.5" in the catalog--and I wouldn't have bought one if they did.

Here's a pic. Parallax error of photo makes it look like it comes in under 1.5" but it is spot on at an inch and a half.