Hello Philip and welcome to the Cow Audio Forum,
Why do you want to use a shotgun mic indoors?
The Sanken CS-3 is not really a shotgun. The element is at the tip of the tube. Traditional shotgun mics place the element at the bottom of the tube and use the tube to increase directivity at high frequencies.
Middle and low frequencies are still picked up and that gives the interference-based shotgun mic a hollow sound in reflective environments such as most indoors and even outdoors on blacktop or concrete with hard, flat surfaces nearby. You're better off with a hyper or super cardioid like a Schoeps cmc641 or Sennheiser MKH 50.
Regards
Ty Ford
Cow Audio Forum Leader
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