A way to modify a media file to include an advertisement is described herein. Accordingly, the need for a separate charger for the associated device can be eliminated. As such certain of the embodiments provide efficient and cost-effective cleaning of solar wafers on the beam that is also economically viable on a commercial scale. The computing device determines the frequency and impulse responses for each loudspeaker and equalizes the speakers for the listening position. The session record enables analysis in the units of session instead of individual packets.