I am looking to purchase one of the Radio Shack 'sound level meters' in prep for positioning my recently purchased Axiom speakers. Any recommendations as to whether it should be an 'analog' unit or a 'digital' unit ? Any advantages or disadvantages worth considering especially if one is a novice in this area (i.e. accuracy, ease of use, etc. ? The price is only $10 more for the digital so I am not too concerned with that factor. Thank you in advance to all who respond. Regards, Paul.