I started testing last night but ran out of steam after getting home late yesterday! I do have a question though! there is the volume on the amp and the volume on the tone tester site, How would I use them? What I started to do was put the amp for each of 1/2, 3/4, 4/4 volume levels I would run through the tone gen volume's 1/4, 1/2, 3/4, and 4/4, making an evaluation of what I felt. What I did notice towards the top end of the tones I tested on the El Cheapo's that the feel would be the same if not a little less the more I cranked the volume up, I guess this is the unit or the amp hitting its limit! More than likely the amp not delivering what the so called 100w transducer is rated for. Not surprising . However the thing that surprised me was the these El Cheapo's were actually delivering in the 10Hz range! Here is a link to my work in progress spreadsheet with me running out of power before the 60hz test. I might have to change the numbers once I test the Sinustec ST-BS 250. My take on these are that the Reckhorn upped there unit and just re branded there existing stock and parts as the "Sinustec ST-BS 250"