Remote Monitor Selector

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frederic

frederic

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There are many ways of selecting between different audio monitors, the simplist being nothing more than a switch, rotary or toggle, that selects pair "A" or pair "B". The switch you'd acquire would be a 4PDT switch, with the center lugs going to the four amplifier outs (left +, left -, right +, right -) and the end lugs would go to the corresponding monitor inputs.

Or, one can be fancy, and use relays. I chose relays because I can have one switch to select between monitor pair's A and B, and another switch to bypass the in-series subwoofer I often mix with. This way I have four combinations... monitors A, monitors A with sub, monitors B, monitors B with sub. I have another relay to put in with a simple interlock, so that the sub can be powered by a seperate amp, via another switch, for surround mixing (L, C, R, Sub, RL, RR). More on that another time. I ran out of relays :)

Here are most of the pieces... switches, relays, screws, wire, soldering iron, huge wall wart (I so hate these things), and a piece of angle iron to mount the switches in. I used lighted switches so I don't have to guess what is enabled or not.
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Closeup of the holes for the switches, in the angle iron. The angle iron will be painted green like the console table and mounted under the video monitor shelf, over the Akai remote area.
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Design change! I decided the switches were too far back, requiring me to stretch too far to reach them convienently, so I mounted them underneath the padded, vinylized desk area instead. Used spades so I can easily remove them for replacement if necessary.
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More progress. Switches mounted and wired, power connector hanging out of radio shack project box. I'll mount the box at the back of the console, right in the center.
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Here is the top side of the remote switching box, with speaker wire connectors installed.
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A gratuitis close-up of the remote box.
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And all three pieces... remote box, front-mounted switches, and huge wall wart. So far, no smoke! And yes, soldering while lying on the floor sucks! But isn't the floor pretty? Aaaaaaaaaaah.
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This soooooo blows.....

My smaller double vifa woofer monitors work fine, no problems.

When I flipped the remote over to the bigger monitors (JBL woofers), there was minimal bass on the left side, and nasty scraping sounds on the right.

Shredded woofer surrounds!

Great, guess I'm adding woofers to my "to buy" list. Fuck me. I hope the moths choke to death.
 
frederic said:
Great, guess I'm adding woofers to my "to buy" list. Fuck me. I hope the moths choke to death.
When you say surrounds, are you talking about the gasket which connects the cone to the frame?

Also, are the surrounds (gaskets) foam or cloth?

If so, why not just get them replaced? I'm assuming that this can be done with the JBL's. I just had this done to a set of woofers.
 
geet73 said:
That's pretty sweet. How hard would it be to wire something up with a volume knob, much like the Presonus Central Station? Or would that bit a bit more involved than this?

It would be about the same complexity. I debated doing this actually, however the master fader is directly dead center of the console table, right in front of me, so I figured "why?".

You'd want something like this, though this is only had capacity for 60W RMS per channel...

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=300-527
 
pdlstl said:
When you say surrounds, are you talking about the gasket which connects the cone to the frame?

Also, are the surrounds (gaskets) foam or cloth?

If so, why not just get them replaced? I'm assuming that this can be done with the JBL's. I just had this done to a set of woofers.

They are foam...

I could have them redone, but this will be their third time, and I'm not sure how its going to sound... these are very old beasts...
 
Totally understand...

...but, $30-$35 per speaker vs $$$$$$$$. :) It might be worth a try. They won't need a re-cone. Also, if they sounded great before the damage, they should sound identical with new gaskets.

It might have been moths, but most likely dry rot. It really gets the foam gaskets at around 8-10 years.
 
pdlstl said:
Totally understand...

...but, $30-$35 per speaker vs $$$$$$$$. :) It might be worth a try. They won't need a re-cone. Also, if they sounded great before the damage, they should sound identical with new gaskets.

It might have been moths, but most likely dry rot. It really gets the foam gaskets at around 8-10 years.

Probably was moths, we had a sudden moth problem in various closets this year, first time, and when I took the grills off the monitors two dead moths fell out of that one, so I drew the same conclusion. It could also be from heat/cold cycles, as they were in the attic, and the other monitors weren't. I didn't expect to leave them in the attic for 2 years, studio construction took 4 times longer than I thought.

I'll investigate replacement of the gaskets, as that is less costly. Just a little concerned they won't sound the same, not that they sound even remotely original at this point...

And on the volume knob thing... yes, they are expensive, however if you need one, you need one :) Since the master fader is right in front of me I opted to pass on the remote volume control.
 
frederic,

Do you have a JBL authorized repair facility up there in NY?

We're fortunate to have one 30 miles away in Dallas.
 
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