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Old November 24th, 2012, 12:18 PM   #1 (permalink)
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XLR to 1/4" Speaker Wiring Question

I recently got a older 100w power amp to run our monitors with. The speaker outs are the bare wire screw down style, or XLR males.
I have 2, 25 ft, very good quality speaker cables I've been using for years, 1/4" x 1/4". They have 2 wires in them, no shielding.
I want to buy XLR female jacks and wire them up correctly for this setup.
The XLR has 3 connectors, the 1/4" has 2.
I have found Many different wiring diagrams, adding confusion to what should have been something very simple.
I think this one is the correct one for my situation:

Is this the one I want, with the Jumper from 1 to 3?

Thanks guys.

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Old November 24th, 2012, 03:34 PM   #2 (permalink)
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I've also got an old 100 watt amp that I scavenged from somewhere. On mine the screw down knobs also double as banana plug connectors. Is yours like that too? Anyway I just wired my speaker cables with the banana plugs. I have done the XLR to 1/4" thing on other equipment, but I can not recall the pin numbering system off the top of my head.
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Old November 24th, 2012, 04:14 PM   #3 (permalink)
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XLR as a speaker output from an Amplifier?
That doesn't sound right.

XLR's are for LINE LEVEL signals.
They aren't designed to connect to the larger Conductors (wires) for that kind of use.

To each their own, but this old sound man does NOT recommend this procedure.

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Old November 24th, 2012, 04:45 PM   #4 (permalink)
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Sure, lots of amps have xlr outs. I have no idea how they are wired. I always use banana plugs too.
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Old November 24th, 2012, 07:40 PM   #5 (permalink)
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Yup. The screw downs are that type, Banana. Maybe that's the way I should go.

I kind of like the XLR idea, as it locks into place, is big and easy to hook up in dark conditions, and usually holds up forever if put together properly.
They are about 8 bucks each at Radio Shack.
HH is the brand, made in England.
StringTree, here it is; Big John, is this like yours?:






The input is XLR or 1/4".
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Old November 24th, 2012, 07:49 PM   #6 (permalink)
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Quote:
Originally Posted by OlRedNeckHippy View Post
Big John, is this like yours?
Mine is slightly different. It's got two XLR inputs and two pairs of banana plug outputs. The banana plugs, though they don't totally lock in like an XLR, are still in there pretty good. I use them all the time with electronic lab and field equipment, and they hold up well.

Last edited by Big John Studd; November 24th, 2012 at 09:04 PM.
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Old November 24th, 2012, 10:17 PM   #7 (permalink)
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I would make a guess and say the XLRs are for low voltage (70volt) ceiling speakers. Like that used in commercial/ office buildings. Not giving you full output power to larger speakers.
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Old November 24th, 2012, 11:30 PM   #8 (permalink)
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You will be going from a balanced output to an unbalanced output/input and it will be low volume with a lot of hum.
Don't do it.

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Old November 25th, 2012, 12:57 PM   #9 (permalink)
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Go with the Banana Plug x 1/4".
It will carry the load a lot better for you.
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Old November 25th, 2012, 01:14 PM   #10 (permalink)
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Quote:
Originally Posted by peatea View Post
You will be going from a balanced output to an unbalanced output/input and it will be low volume with a lot of hum.
Don't do it.

Pt
If they are in fact spkr outs, they are not balanced, not everything that is on xlr style is balanced.

The spkr out is likely pin 1 for ground (neg) and pin 2 for pos.
So pin 1 would go to the sleeve of the 1/4 and pin 2 to tip.

Pin three is likely open.

Open the amp lid and have a look.

bob, another old soundman
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Old November 25th, 2012, 01:26 PM   #11 (permalink)
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It looks like (though it is not readable in the images) that the top of the chassis has a circuit diagram printed on it. That may even tell you what sort of impedance the various outputs are capable of driving.
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Old November 25th, 2012, 05:44 PM   #12 (permalink)
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This should help. Just what is a "100 volt center taped balanced line"?
Thanks for the help guys.

Blow the pic up full size. I tried taking pictures of the schematic on top but my POS camera isn't cooporating. This is a screen cap of the PDF Manual.

Here's the Link to the PDF Manual, with specs. V150L: http://www.hhamplification.co.uk/dbf...HBroadcast.pdf

I used the bare wire screw downs on the right, the 4-16 ohm ones, to one monitor speaker, then out of that speaker to the 2nd one, and it worked very well.

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Old November 25th, 2012, 06:12 PM   #13 (permalink)
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You have a binding post and an XLR output for EITHER 100 volt distribution systems (don't use this for PA applications) OR 4/8 ohm speaker cab(s). You only have ONE speaker out on that amp. Don't use the 100 volt side for a cab - you probably won't like the results.

The 100 volt out is marked with the little lightning bolt.

Use the other out with either an XLR to 1/4" speaker cable or banana plug to 1/4" speaker cable to the cab(s)

From that output you can use ONE of the following:
a SINGLE 4 OHM CAB
daisy chain two 8 ohm cabs (4 ohm load)
daisy chain two 16 ohm cabs. (8 ohm load)

Don't daisy chain 4 ohm cabs, that'll let the magic smoke out ;)
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Old November 25th, 2012, 06:35 PM   #14 (permalink)
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Thanks Moonrider.
I did the Daisy Chain with two 8 Ohm monitor cabs from the "Binging Post" on the 4-16 ohm side, and it worked very well.

So, I can use the XLR 4-16 ohm ontupt, daisy chained. Cool.
Do I wire it like the picture above?

And,
What does "100 volt distribution system" mean?
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Last edited by OlRedNeckHippy; November 25th, 2012 at 07:40 PM.
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Old November 26th, 2012, 10:59 AM   #15 (permalink)
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Quote:
Originally Posted by OlRedNeckHippy View Post
Thanks Moonrider.
I did the Daisy Chain with two 8 Ohm monitor cabs from the "Binging Post" on the 4-16 ohm side, and it worked very well.

So, I can use the XLR 4-16 ohm ontupt, daisy chained. Cool.
Do I wire it like the picture above?

And,
What does "100 volt distribution system" mean?
Pin 1 to jack casing, pin 2 to jack tip. Don't worry about pin 3 - speaker cable is only two conductors.

Diagram #18 here: http://www.sommercable.com/2__produk...tspr_kabel.htm

Wikipedia has a pretty good description of high voltage sound systems here: http://en.wikipedia.org/wiki/Constan...speaker_system
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Old November 26th, 2012, 02:04 PM   #16 (permalink)
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Moonrider, you Sir, are The Man!

Perfect. Thank You!
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Old November 30th, 2012, 01:38 AM   #17 (permalink)
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Buy a couple of panel mount Speakon connectors and replace the XLR's. They're a direct replacement size-wise. I did that to a Carvin Mixer I have that had XLR speaker outs. Best thing to ever happen to that mixer.
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Old December 1st, 2012, 05:31 PM   #18 (permalink)
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Makes sence Paul, but it's too late. The cable I made could get mistaken for a low impediance mic cable. I just realized I've never taken a mic cable apart. I have no idea if it's shielded wire or not. I'll get some red tape or paint the ends or something.

Anyway... I went to GC and the guy in Pro Audio (Pro?) told me I was nuts.

"No unit has ever been made with XLR outputs for speakers."

I gave up early in that disucssion. He was adament that I was dead wrong. Told him it was old English stuff and quietly grabed the jack I needed and mosey'd on.

He also had absolutely no idea what the 100 Volt output was about.
Pro Audio. Why is it Pro? Why arn't the other departments Pro Drums and Pro Guitars?

Moonrider's Wiki link on the 100V was very interesting. These amps must have been made for something more than just rock and roll.

I printed out Moonrider's Scandinavian Wireing Diagrams (cool site, I love the way they label the positive and negitave. "+ Life & "- Ground").
I soldered up the XLR and it's working perfectly.

Thanks for the help guys.
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Old December 4th, 2012, 11:47 AM   #19 (permalink)
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Quote:
Originally Posted by OlRedNeckHippy View Post
Makes sence Paul
Moonrider's Wiki link on the 100V was very interesting. These amps must have been made for something more than just rock and roll.

I printed out Moonrider's Scandinavian Wireing Diagrams (cool site, I love the way they label the positive and negitave. "+ Life & "- Ground").
I soldered up the XLR and it's working perfectly.

Thanks for the help guys.
The high voltage systems are used often in distributed sound systems where you're going to be hooking up a LOT of speakers. Think offices, schools, restaurants, stadium announcement PA, etc. They remove the need to worry about matching and balancing impedances.

Glad I could be useful - the XLR connects weren't so unusual back in the day.
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