Live Sound Help!!!
Home > Home Recording Forum > Live Sound Reinforcement > Live Sound Help!!!
Posted on Jul 20, 2010 10:34 am
Rusty
MuSiC mAn
Member Since: Jan 31, 2008
I was thinkin about buying another power amp to help boost power to my speakers. I currently have a Behringer Xenyx Series 1222 FX mixer, a Behringer EP2500 Power amp. I have two 2X15 cabs with horns and tweeters as mains and a set of floor monitors each with one 12 and a horn. The two 2X15 cabs are 8 ohms and the floor monitor speakers are 4 ohms. I plan on purchasing a Behringer EP4000 to run my mains cause i plan on buying more speakers and using the 2500 pa to push my monitors and i plan on buying more monitors. How would i tie in the two power amps to the one mixer?
[ Back to Top ]
Jul 20, 2010 12:02 pm Well, just about all power amps have XLR inputs these days. And that means that you can just use a "Y" cable to split the same signal going to as many amps as you wish.
For monitors, I'm sure that you know, that you need as many Aux sends as monitor mixes that you want. I think that the board that you have has either 2 or 4 Aux sends. So, that is how many mixes that you can get. But, you still can gang the amps together. And run more monitors on the same mix.
One question that I have (Just because I didn't see you listing them here.) is do you have 31 band EQ's? That is one thing that I would suggest buying as well with the additional speakers. With more speakers, comes more energy in the room. And you will need a half way decent EQ to help reduce feedback.
Jul 20, 2010 02:58 pm Y cables work but are not preferred as they change the impedance. Are you running the two amps from the same source - like more mains and amps? I almost thought you were separating mains and monitors.
www.livesoundaudio.com
Jul 20, 2010 07:00 pm Yeah, true. They do change the source impedance. But, it's the difference of 0.0001 to 0.0002. Not enough to make a difference in the total dB input gain.
Being that most source input impedance is 10k in ohms. By splitting the signal your looking at a 5k impedance. So, a 1.23 volt signal is now 1.22789345........ and so on, and so on. You would have to add about 5 or 6 amp on the same line to really effect the signal. And at that point, your usually running a fairly large system that is addressing each driver separately anyway. And should have some crossover in it.
