Dear friends: For almost seventh months my system was running with only one subwoofer ( left-right channel bass signals in mono way. ) due that the other one was down because a failure, five/six weeks ago this one was fixed thank to Velodyne and I want to share with all of you something about:
due that I own two similar subwoofers we try to fix it at home, first we have to know where the failure comes so we check ( through the sub in good condition ) every single module and we found that the failure comes from the amplifier module that with out the diagram was a very hard time to fix it so I contact Velodyne and they agree that the amplifier module was the problem and that I send it to repair ( amplifier module alone ).
I did it and ten days later I receive a " big " box with the amplifier module ( at least that was what I think at that moment ) and when I open the box I was surprised that they not only send me the amplifier module but the whole subwoofer modules ( including the metal rear plate ): they send me a whole new electronic subwoofer modules!!!!, my hat off to Velodyne.
Over those six months my ears/brain were totally accustom/equalized to that single subwoofer quality system performance.
I connect the second one and put some of my prefered Lp's and the quality performance of the system " suffer " a big improvement against the " one subwoofer " fashion, this improvement is on the quality performance level not on quantity.
Through this experience I confirm again that one subwoofer in an audio system is the ( almost ) wrong way to go.
IMHO nothing compares to two subwoofers in true stereo fashion!
Regards and enjoy the music.
Raul.