Having had the opportunity to fully audition a Rel Stentor,Studio and a Velodyne DD15 I can now let you all know the outcome. First I listened to stereo music with the DD15 connected up vie the lfe input, the automatic parametric equalizer was used to obtain the flattest response, with a crossover setting set at 80hz before firing it up with music. My first impression was - wheres the bass? turn up the volume. The volume was gradually turned up until I could now hear the low frequency parts of the cd track which has a good level of bass between 10 - 30hz present. Although the bass was present it sounded rather loose compared to what I am used to hearing in this track. A multitude of different cds were used with the same outcome. Next the film part - Day after tomorrow wave scene, Flight of the Phoenix, Top Gun amongst many others. The bass emanating from these films did sound far more impressive than when listening to music - powerful vibration inducing bass rattling everything on the shelves in the room. The film audition I thought would now improve my rating of the DD15, until that is I heard the Rels! We went straight for the kill, the Studio III connected via lfe only, with the same crossover setting of 80hz for an even playing field. Music just took on an altogether jaw dropping character. The bass was lower, tighter with more feel to it, I could count the waves as they hit my body with such depth and precision, not simply a low frequency tone but the tones had texture and width sufficient to literally be able to count the cycles as waves of bass simply washed over my body. I had not experienced bass like this anywhere apart from when a huge lorry stops outside my house with its engines idling at very low frequencies, the bass sounded as real as this. The same films were used with much the same results, the Velodyne was simply eaten alive by the Studio, the Stentor also showed it a clean pair of heals with very similar results, and now had to be relegated to oblivion, at least for this audition. Now it was the turn to compare the Stentor III to the Studio III. The Stentor was probably the biggest surprise of all falling behind the Studio in all respects but it was much closer than I had anticipated before this audition. I really wanted the DD15 to be my favorite because of its compactness would allow it to fit in to my set up with the minimum of disruption but it was not to be. If anyone is looking for quality deep bass and I mean real bass then there is really no comparison IMHO between the Rels and the DD15. The two Rels displayed an almost magical act of producing this most elusive of bass that I'd not previously experienced. I left with a gaping mouth and the question - why do many people on this forum run down Rels because if they heard what I had heard I'm sure they would question their judgment.