At some low frequency, determined by the spacing between them, the sub and the mains are driving the whole room in "push-pull" manner.
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They are Vintage Teledyne Acoustic Research AR-9, I had them completely went over 3 yrs ago, they have a 4-way design 2 12 inch woofers, 8 inch lower mid, an upper mid and a tweeter....they are old, but sound pretty darn good to me, although I am looking to replace them soon with VMPS monitor2 speakers. When new they went for $1600.00 wich one can argue that might translate into around a $4000
speaker at todays cost, I am new expert though, but that would be my guess...they bluebook at around $600 still.
I had to follow up on this post. I decided to tweak the subwoofer by removing the rubber feet and adding spikes, and opening the sub, replacing the foam with audiophile egg carton stuff I bought off the internet. Last, I placed a marble slab from the garden on top of it. I still place it in back of my chair and it is sounding better than ever; however, the 3D effect seems to have disappeared to some degree. Now, the bass seems to be coming straight from the mains which is kind of funny considering the sub is actually behind me, out of sight.
I am playing the new release from Bad Plus and it is really, really freaking me out.
Now, I am wondering how all this would sound if I have a true, audiophile grade subwoofer.