Originally Posted by Chris_W
I am the mostly very happy owner of a Velodyne DD-18, which i bought in November 2006. On the very first day it had a malfunction and gave out a massive "plopp" (explosion like) sound. I called my local dealer and they (unfortunately) repeated the plopp two or three times to identify what was wrong, by the second time I had left the room as I couldn't take it anymore. At the time it was diagnosed, that the amp was faulty and it was replaced within a week or so at no cost (being absolutely new). Although the sub was back to "normal" (which is absolutely fantastic) and has never done it again so far, i was so shaken from this experience, that i had promised myself, that if it would happen again, i would seriously think about sell. I was really very shaken and stirred ;-)
Yesterday as I was listenting to some music from CD there was suddenly a strange bass sound, like a mild plopp and at first I thought it was my main speaker or the attached amp having a problem, but after serveral logical dis-connects and re-connects i found out that the sound comes from the Velodyne. I have not dared to switch the sub off (ever) as i am always afraid it might give me another giant "plopp" again. So I wonder what can be the reason for the strange bass sounds that comes from the sub? They seem to come and go with the bass-signal somehow. As long as there is no bass, there is also no strange bass-plopp sound from the sub, however, when the bass intensity in the music signal increases, so does the strange bass sounds from the sub. Is it likely a problem that can be cured by a reset and power off and on cylce or does it sound more like an amplifier or sensor issue?
Comments from anybody with similar experience or knowlegede regarding this phenomena are greatly appreciated. Please consider to spare me another giant plopp experience with any suggestions, if possible.
There are a couple of possibilities, and without having the unit infront of me it is a bit harder to be certain, so lets start with understanding you system a bit more.
How is your subwoofer connected (LFE/Speaker wire)?
Are your mains speakers set to small or large?
What is your crossover point set in the receiver and the subwoofer?
What is the subsonic filter set at in the subwoofer?
What volume is the subwoofer typically set at?
What is the LFE gain setting in the processor?
What type of music are you listening too when you notice the problem?
Is it repeatable?
If the source is connected directly to the subwoofer, eliminating the rest of the system, does the issue persist?