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Topic: 8 ohm speakers? |
George McLellan
From:
Duluth, MN USA
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Posted 23 Dec 2010 11:57 am |
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I have a Peavey XR600G PA, and am using two mains and two monitors. These are 8 ohm speakers. Is it safe to add two more mains and two more monitor speakers?
Another question: do you always have to connect two speaker cabinets or can you connect three speakers?
Thanks,
Geo
BTW, I tried Mike Brown but never heard back from him. |
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Ken Fox
From:
Nashville GA USA
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Posted 23 Dec 2010 1:04 pm
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Can't locate your model. All the others are rated at 4 ohms total load per power amp, so two 8 ohm speakers per power amp is all you can do.
4 per side would be a 2 ohm load and that will overheat the output transistors
Last edited by Ken Fox on 23 Dec 2010 4:35 pm; edited 1 time in total |
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Jack Stoner
From:
Kansas City, MO
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Posted 23 Dec 2010 4:14 pm
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The XR600F/G's have a "Main" and a "Monitor" with two speaker jacks for each. You can actually use the Monitor side for main speakers too. It's really two 200 watt amp sections. 4 ohms min load each channel.
We are using a G model when I play on Tuesday's and also where we hold our Florida Steel Guitar Club jams. |
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Jerry Roller
From:
Van Buren, Arkansas USA
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Posted 23 Dec 2010 9:50 pm
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Ken and Jack, I would like to freshen my knowledge and print off for future reference. If you hook two 4 ohm speakers in parallel you have a 2 ohm load? Hook two in series you have an 8 ohm load or is that backwards. I will print and keep the answer. I think you can use this to hook up a greater number of speakers if you hook up right?
Jerry |
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Pit Lenz
From:
Cologne, Germany
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Posted 24 Dec 2010 2:10 am
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| Quote: |
| If you hook two 4 ohm speakers in parallel you have a 2 ohm load? Hook two in series you have an 8 ohm load |
Jerry, you got it right!
The math is a little more complicated but if you take two speakers with identical impedance their combined impedance
- will half when hooked in parallel and it
- will double when hooked up in series.
For those who want to know it more precisely, here is a calculator with the exact formula for parallel resistor hookup and here´s a wiki about parallel and serial calculations... |
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George McLellan
From:
Duluth, MN USA
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Posted 24 Dec 2010 3:21 am
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Thanks to all for the help. If I understand this correctly, I could use the monitor side with four 8 ohm speakers connected in series instead of parralel without any problems and leave the two main 8 ohm speakers as is?
It's not a "I need more volume" thing but it would be nice to have two more monitors.
Geo |
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Pit Lenz
From:
Cologne, Germany
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Posted 24 Dec 2010 5:37 am
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George,
You´re correct, that would be safe.
But if you put four 8-Ohm speaker in series, you'll end up with a load of 32 Ohms.
Completely safe but maybe a bit ineffective.
As you will have to solder a special speaker cable setup anyway (the speaker´s own outputs are always parallel outs), let me propose a different setup:
If you connect two speakers each through their normal link jack or speakon plug , you get a load of 4 Ohms for each pair.
Now fix yourself a Y-cable that has one input and two Outs. Solder the two outputs in series. Hook each pair of speakers to one of these outputs and you´re back on 8 Ohms.
Sound a little complicated, but the math is easy:
(8 Ohms parall. to 8 Ohms)=4 Ohms. -For each pair of speakers.
Put two of these rigs in serial:
(4 Ohms ser. to 4 Ohms) = 8 Ohms.
There 'ya have it.
If this seems too complicated, I can provide you with a schematic drawing...
Merry Christmas to y'all !
pit |
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Joe Glavey
From:
New Jersey, USA
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George McLellan
From:
Duluth, MN USA
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Posted 24 Dec 2010 7:38 am
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Thanks Pit, that makes sence to me. I'll make up a patch cord.
BTW, my wife and I spent a couple days in Cologne several years ago. You have a beautiful city. I remember walking through the Cathedral that's right kiddy/corner from MacDonalds. It was really breathtaking.
Regards,
Geo |
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Pit Lenz
From:
Cologne, Germany
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Posted 24 Dec 2010 9:46 am
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This is where i'm heading right now.
The Cologne cathedral has the largest freeswinging Bell of the world ( note of a deep C ) and there's all the cathedral's bells ringing for christmas. Now that's BREATHTAKING! |
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