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Author
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Topic: Eumig Audio Connector
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted April 17, 2018 08:21 PM
Hi Brian,
This is Eumig 800 Series, right?
If so:
The two prong plug is not the best way to go when you are talking about hooking into an amp: it's an external speaker jack and the signal is too strong. (There are interfaces available to make this work, though. A friend of mine uses one to connect a Kodak Pageant into an amp.)
There should be a pair of 5 pin DIN jacks up near the front of the machine along the bottom edge on the right side. One of these is a line level output and this is much better to input into an amp.
This is what I use.
This is worth doing, but there are obstacles. I had my external audio hookup working for a couple of years before I managed to get my Eumig to play nicely with it.
Something I ran into is the grounding on Eumig 800s is not that great, so it's very easy to get ground loop hum, especially if the Amp is grounded too. So if you hook it all up and the whole room is humming, I can help with that.
Another thing is Eumig has an astounding 50,000 Ohms series resistance with this output, this means with a 10,000 Ohm line level amp input, your signal has been cut down to 1/6 what it started out as. (You can call that "1/11th" if you drive two stereo channels together.)
I solved both of these by connecting the Eumig into a mixer, but that's something like step #8.
Maybe we should just start with step #1 and try to get you a cable!
Do you solder?
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All I ask is a wide screen and a projector to light her by...
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted April 19, 2018 09:26 AM
I guess you could even snip the connector of the dead channel off, bearing in mind you only get one shot at choosing the right one!
The next thing you need to think about is ground loops. This is something that is mostly a problem of the house wiring and it's beyond your control. It can be better or worse, it can be so slight it might not be a problem at all, but when it's bad, it can drive you back to the internal speaker without a second thought.
The long and the short of the problem is that between the third prong of different outlets there can be a voltage. It's not a huge voltage: couple of volts at the most. The problem is the signal you start off with is pretty slight as well and if you mix these together it can sound really bad.
-first time I plugged a projector into an amp, my wife heard what was going on and asked "What are you DOING?!!" (that bad...)
There are a lot of things you can do about it. Here are some easy ones:
Plug the projector and the amp into the same outlet. There are no ground loops without the loop.
Be mindful of what other grounds your amp is exposed to. My amp isn't self grounded (two prong plug), but it has an audio connection to my TV (also two prong), but the TV is connected to my cable box which is (well: "was") grounded to my cable TV provider. Eventually I put a ground isolator between the cable box and the coax going out to the pole.
There are also ground isolation transformers you can insert in the line between the projector and amp. Amazon sells them, so does Steve Osborne.
As I said, the grounding on Eumig 800 series isn't the best. It can play this ground loop game all by itself. There isn't a nice thick green wire running to the machine's frame. Instead it runs to the power transformer and the machine is then "grounded" through the transformer mounting bolts. This is not a solid connection and you can develop a couple of volts when it becomes compromised. Despite all the other anti-ground loop stuff I have, I developed a buzz in my speakers last summer when my Eumig was in the setup. I stuck a lock washer on one of these bolts to bite into the metal better and it went away. (I'll replace it with a star washer someday.)
-but then again you haven't even connected up yet: let's fix the problems you have when you have them!
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All I ask is a wide screen and a projector to light her by...
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Brian Hendel
Jedi Master Film Handler
Posts: 902
From: New York, New York
Registered: Jun 2003
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posted April 19, 2018 08:14 PM
Thanks Steve! I actually found a five prong audio cable in my bag of tricks before the one I ordered from Ebay even arrived...and... plugged it straight into my Bose receiver... and .... drumroll... it works! There's just a little hum but not too bad. I'm in the middle of building a very high-end home theater at my weekend place. But it's actually the "low-fi" components that are causing more trouble for the installers than the high-end stuff. They can't believe I am dealing with 8-tracks, cassettes, LP's, VHS, and of course... film! The Elmo GS1200 RCA cables are easy... but I'm sure the Eumig plugs would have baffled them. Now I can answer their questions... about this projector at least. If I have more trouble, I may hit you up for more advice. Thanks again, Brian
[ April 19, 2018, 11:11 PM: Message edited by: Brian Hendel ]
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