Hi, I recently bought an ED A5-350 sub with the lt-550 amp and I am trying to get it integrated into my current home theater. The problem is all of my settings i tried(including just letting onkyo's audyssey set it up for me) have left it anemic. Also when I did get the sub working relatively well it would go into protection mode. I know this was a problem in the past and I bought it used, but the owner expressed that it never happened to him. I have the phase and crossover at 0 and the gain has never went past the 12 o'clock position.

Here is my current setup:
onkyo 605

Polk RTi10- 80hz
polk csi5- 80hz
polk fxi3-80hz
LPF of LFE-120hz

The sub is calibrated at the correct distance away for the time being and has been set anywhere from -6 to -2. Does anyone have any advice for setting this sub up? I feel I have to be doing something wrong to not get anything out of this monster of a sub.

Thanks

It may not make much of a difference, but check the LFE level settings in the receiver (not the same as the LPF) and check your phase switch. However, my first inclination is that you are sitting in a null.

However, my first inclination is that you are sitting in a null.

I 100% agree with that. You can have the most powerful sub in the world and be sitting in the wrong spot and/or have the subwoofer sitting in the wrong spot and hear absolutely no bass from the subwoofer or even worse hear less bass with the subwoofer on. Auto calibration is great and makes nice improvements, but it cannot fix bass cancellation so it will try to compensate for it by boosting the gain which will cause even more cancellation and drain all the power from the subs amp leaving you with no bass and a overworked amplifier. Placement is number 1.

I have the phase and crossover at 0

What do you mean by the crossover at 0? You appear to have the bass management set-up properly in the receiver; that being the case you want to disable the crossover on the sub by switching it off, if possible, or turning it as high as possible. If you have the sub's x-over cascaded with the receiver's you'll be cutting out a lot of mid-bass.

Thanks again for all your responses. I definitely have to get more seat time and right now the sub is not in the most advantageous spot because I'm waiting for a new sub cable that should arrive in the mail. My problem is that I sometimes have to physically touch the sub underneath to make sure its still on and working. I guess i was expecting to be blown away, but in the scenes I thought would shake my house it is barely audible. I know that this sub can move some serious air, but I have been trying to mimic what others have done for a starting point with no luck. Sorry I mistyped about the crossover. I meant it was at the highest setting. I also have it set on always on.

To answer the over worked amplifier. If I haven't went past the equalizer setting of -2 or -3 would the amp still be overworked? I haven't put the dial past the 12 oclock position. Is there something I am missing to this puzzle? Thanks again for all your help.

Here's something to try...
Put your subwoofer where you sit, then set the amp to DSP bypass. Play some music, or pink noise and walk around to possible places where you could possibly put the sub. When you find a louder area, put the sub there. You'll basically be using a room node to your advantage that way. Also, with noise playing have someone slowly tun the phase knob until the low end is loudest. You'll want to do that with the sub in it's final resting place.