Morning Rick! Here's an interesting article about L-pads with attenuation charts. The general consensus from the smart guys here is that if your centres are within a couple of dbs, don't bother, but if it was a noticeable amount, you could use an L-pad(confirmed with one of the 'smart guys' via pm).

Oh!! I'll send you the installation instructions, better clear your browser first.

Half of communication is listening. You can't listen with your mouth.