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The Balanced line input of the M-Audio device would normally expect a 1/4" TRS (Tip, Ring, Sleeve) connector as shown below in the top connector of the picture attached. The end or tip (3) is the positive phase of the balanced connection, the middle or ring (2) is the negative phase of the balanced connection and the sleeve (1) is the ground.
You don't have a balanced output from your SPL meter. It has an RCA type unbalanced output. To connect this to an input on your soundcard module that expects a balanced TRS connector, you have to use a TS connector (tip, sleeve) as shown in the picture on the bottom. The tip (3) is positive and the sleeve (1) is ground. The soundcard recognizes that the sleeve and ring is shorted when you plug in the TS connector and it adapts to be a unbalanced circuit. This is the same as the balanced inputs on a BFD act.....
brucek