I'm unsure as to what you mean. I posted this very question on a dozen forums, there the consensus is that bass is long wavelength so a muffler close to the engine (centre car) would prevent the standing waves from forming.
Another consensus is that a long thin muffler eliminates low frequency sounds better than a short thick muffler. Also that 2 mufflers of volume X mute more sound than one muffler of volume 2x.
What I gather so far is that I have to place a long thin muffler center car.
On a generic completely open exhaust system: If one wanted to keep the loud clear overrun crackle from the exhaust but reduce the excessive booming low down bass sound around 500-2000 rpm, would it be adviseable to:
Place a small muffler on the central section of the exhaust, or place it at the end?
All other things being equal.