We sell and recommend an electret condensor microphone we import from Germany. It's $250, very flat and accuarate for these types of measurements.
What you will need to do with the EAD ovation is plug into one of the stereo analog inputs. Set the Ovation to stereo--no processing. Then on the output of that same channel, switch the connection to each amplifier/speaker combination manually. This will allow you to measure and calibrate each speaker independently. The one exception is the LFE. You should do this in the same manner. However, if you have multiple subs, they should all be connected and on and calibrated together. This may sound complicated, but it really isn't. If you need more assistance it might be easiest to call us.
What you will need to do with the EAD ovation is plug into one of the stereo analog inputs. Set the Ovation to stereo--no processing. Then on the output of that same channel, switch the connection to each amplifier/speaker combination manually. This will allow you to measure and calibrate each speaker independently. The one exception is the LFE. You should do this in the same manner. However, if you have multiple subs, they should all be connected and on and calibrated together. This may sound complicated, but it really isn't. If you need more assistance it might be easiest to call us.