excellent introductory app

... for basic home audio/theatre analysis/placement with nominal upgrade costs to either the full RTA ($10) or FFT ($20) - free frequency files (pink noise) can be found at audiocheck.net for those wanting to muck around, although the fuller features of zooming, decay, saving, curves and in FFT the 5hz extension (subwoofers) and detailed graphing seem easily worth the $10 or $20 to assist in properly setting up home audio or theatre...

brucemarch about RTA Lite, v1.5