Mar 12, 2008 11:31 pm What are the speakers and monitor rated at?? 100W, 300W?? A 300W amplifier isn't very powerful??What Amp is it?? Is that 300W per channel or 300W total??
Ohm/Voltage
Posted on Mar 12, 2008 11:01 pm
TipMcVenus
Member Since: Feb 05, 2008
Hey guys,
We are playing a show next week and were going to try to set up a monitor on the floor along with the main PA speakers. The amp is 300 watts and the two PA speakers, I believe, are 4 ohms along with the monitor.
What would happen if we were to plug the monitor into one of the outputs on the amp and then plugged the other output into one PA speaker, then chain it to the next. Hope that makes sense.
My main concern was the ohm/power problems we might run into.
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Mar 12, 2008 11:31 pm What are the speakers and monitor rated at?? 100W, 300W?? A 300W amplifier isn't very powerful??What Amp is it?? Is that 300W per channel or 300W total??
Mar 12, 2008 11:35 pm Lots and lots of feedback.
First, you are over loading the amp. With only 300 watts, you are pretty limited on the amount of speakers that you can run.
Second, by tying in a monitor that also runs to the FOH PA, you are just asking for problems. The EQ curve for monitors as opposed to FOH, is very different. The EQ curve is dependant on proximity, pick-up pattern (of the Mic), and gain. Also the number of mic's and distance from the speakers.
Remember, in order to determine the total ohm load of your amp. The way to do this is to look at all the boxes you have. They all list what the ohm load of your box is. Write down what they are, and them it's a simple math equation. It's ohm times ohm, then divided by ohm plus ohm. (All modern speakers get wired in parallel, their jacks are already set-up this way). Since just about all ohm loads are even numbers, there is a short cut. You can just keep dividing the numbers in half. So, if you have two 8 ohm speakers, and you are putting them on one side of an amp, then just divide 8 in half. So 4 ohms would be the total. So, add two more 8's to this. 8 in half is 4, another 4 is 2. So, 4 - 8 ohm speakers is a 2 ohm load.
A lot of amps can handle such a small ohm load. But it is always a wise idea to check your spec's for your amp, just to make sure.
The best way to hook up your monitors, is to use one side of your stereo amp for the FOH. And the other for your monitors. On your mixing board, you should have a AUX send out. This is what you use to run monitors and build your mix. A 31 band EQ would be advisable for each of the mixes. FOH and monitors. This will help reduce feedback and allow you to get a cleaner sound. Remember, for each mix of monitors, you need a separate 31 band EQ.
Hope this helps you understand a little on how to set-up for your show. If you need more clarity on any of these topics I just throw at you, please just ask. I'll do me best to help.
Mar 13, 2008 12:13 am Sorry Tip! I just reread your post. I noticed that you are thinking correctly. Sadly I am not. I was trying to do to many things at one time. Made me miss read what you wrote. you should be fine hooking you equipment up that way. But, still, 300 watts is very low. At some point, you may want to increase the power amp.
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