Discussion in 'Location Recording' started by hickemo89, Dec 15, 2011.

1. ### hickemo89Active Member

I acquired a Yamaha EMX2300 powered mixer from a friend and have 3 Optimus 12" 8ohm 100w RMS/200w Max Passive Pa Speakers. i've never hooked up a pa system before and was curious to know what else i will need and to hook it up! please help thanks

2. ### Steve@RussoActive Member

wires and 1 less speaker

3. ### bouldersoundReal guitars are for old people.Well-Known Member

Microphones, mic cables, speaker cables. Other things you might want include effects, eq, direct boxes, patch cables etc. Radio Shack (Optimus) P.A. speakers aren't going to sound that great, so some better speakers might be worthwhile at some point.

Most PA amplifiers want a load of no less than 4 ohms. That means that 2, 8 ohm speakers in parallel equates to 4 ohms. Divide 4 by another 8 ohms and you will have a loss of power, crappy sound or even a blown out power amplifier. Thankfully, companies like Yamaha already know folks who are not intelligent enough to ask the question you have have built-in protection schemes to allow loads down to as little as 2 ohms without incurring equipment damage or failure. Others aren't so lucky.

My math is lousy but at least I know how to multiply and divide in spite of my neutral density.
Mx. Remy Ann David

5. ### vttomActive Member

I sometimes use 3 speakers with my 2-channel powered mixer/PA. I put it in mono Main/Monitor mode (instead of L/R stereo mode) and drive 2 speakers in parallel from the main out for FOH, and the 3rd speaker from the monitor out as the band's monitor.

6. ### vttomActive Member

BTW - The equation for parallel impedance is 1/Z = 1/Z1 + 1/Z2 + ... + 1/Zn. eg. 3 8Ohm speakers in parallel gives 1/Z = 1/8 + 1/8 + 1/8 = 3/8 -> Z = 8/3 = 2.66666 Ohms.