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question regarding location and calibration of a subwoofer system.

Hey all, sorry if this is a repeat of an oft asked question. I searched but could not find it.

I'm trying to find out about a good location for subwoofer(s) in my CR and how to calibrate it/them. My limited understanding is that time alignment can be an issue with them.

My current layout is:

Is this sub dead?

My 15 inch sub used in my studio is giving an intermittant fault. It kicks in and out. Unfortunately the light for the sub is on the back and takes a bit of crawling to see (its a heavy beast to move) but I can see that the power light goes off when it silences. it runs through a 'kettle' type power lead and I have swapped this lead over so, its not the lead.