Axiom Home Page Forums General Discussion Technical Questions EP500 Noise/Surge Suppression

Derek, I'm not following what the reason for your concern is. Certainly you can plug the subs directly in to the wall sockets.

I think he's worried about the subs being almost directly across from one another

Sorry if I wasn't clear JohnK, my biggest concern is with both subs almost facing each other, I didn't know if there is a concern with cancellation issues.

Edit: Yeah onn, that was my main concern. Thank you.

Okay, the factor of the subs facing each other doesn't increase the cancellation factor. In fact, the best locations that were found in the often-cited Harman study on multiple subs were directly opposite each other at the mid-points of the side walls or the front and back walls. An unavoidable partial cancellation effect occurs when two subs(or two of any speakers)play the same sound and the subs/speaker cones are separated by one-half wavelength of that sound. For example, if the speaker drivers are 10' apart, a partial cancellation would occur if they simultaneously played a sound around 56Hz(whose wavelength is about 20', calculated from 1130/56). So it's the distance of separation that's significant, not if the subs are facing each other.

Thank you for your input JohnK. I really do appreciate it! That makes me feel alot better about the placement of my subs. Is this when I need to adjust the phase accordingly to each sub?

No, the phase adjustment would help at that one frequency(56Hz in the example), but might cause an overall reduction at other frequencies, for a net loss.

Ok, I see what you're saying now.

Oops I posted without noticing there were more replies on a new page, again. I'll leave this one hear though in case it adds anything to his question.

There is no reason 'requiring' you to have them on the front wall with you front speakers. The lower frequencies from subs are non directional so you won't be able to tell that the sound isn't coming from up front.

Now that being said, to really perfect the benefits of a two sub combination, you will want to experiment with moving them around as much as is practical, to find the best positions that even out the bass response in the room.

Although it's not necessarily going to be the right answer for your room, I'd probably at least start with a small extension cord for the left sub to push it up so it fires directly across the room at the 2nd sub on the right. As John mentioned, this is one of the common scenarios that is in easy reach of your electrical outlets.

Sub placement can be complicated but there are lots of good articles and posts if you look for them.