i own a 4308ci with 1 definitive technology supercube reference and had/have a Sony SA-WX700 sub. i use the 'sw pre-out' with a y-adapter which i have each sub connected to the rca inputs of the y-adapter. one run of cable to the def tech lfe in and the other cable to the sony's lfe input. i have had the two speakers and the receiver setup like this for over a year. previously [for a few years] i had a paradigm sub in place of the def tech and the sony sub connected in the same fashion.
ok, here's where the mystery begins. i decided to replace the sony with a def tech supercube I. powered off receiver, disconnected the sony [power / rca cable] moved the def tech I into the SAME location, and used the SAME rca into the lfe input and put power to it. i turned on the receiver, turned on one of my directv receivers, and without cranking up the volume on the 4308ci just felt the sub to see if it was producing bass which it was. this was last saturday.
it was a busy weekend so i did not 'play around' with the new def tech but when watching directv over the weekend i thought the sub was working. yesterday i used the audyssey system to recalibrate my speakers. to my alarm, there was no sound coming from the new sub. red light is on [indicating power], all knobs on speaker factory default, and the fuse is fine. so i used my main speaker wire for my right speaker to see if the speaker was producing sound and it is not.
i let my retailer know what is going on and they believe the speaker was damaged by either the 4308ci, the cabling, or something else on my side. i contacted denon and regurgitated the same info in this post and the tech said there is no way the damage could have occurred from the 4308ci.
what is even more perplexing is when i purchased my def tech supercube reference [from a different retailer] i had the SAME thing happen with two supercube references [which they replaced] until finally the 3rd supercube worked and has been working for over a year and using the same lfe out from the 4308ci, y-adapter, BUT in the location where i had the paradigm sub in my theater. so i moved that sub to the other location in my room [over a year ago] re-introduced the sony sub to the location where i had the two previous and now the latest failure of the def tech sub(s).
so, my question(s) to you-all is/are:
- could the 4308ci be frying these sub(s)?
- if the 4308ci is frying the sub(s) why did/does the 'cheap' sony sub work w/o issue in the SAME location / same setup?
- could it be the y-adapter, which in all honesty is not high-fidelity by any means?
- could it be the rca cable run to where the sony was and the new def tech is going to be?
i ordered a better y-adapter today so i'll be swapping out my current adapter.
has anyone experienced this or has any suggestions on the situation? the retailer has agreed to service the definitive technology I, but omg if i have another, imho, defective sub i'll be devastated. both retailers i've worked with say they install def tech subs all the time and the failure rate is almost 0% which is what brings me to this awesome forum.
sorry for being so verbose, i just want to provide as much detail to describe this VERY perplexing issue.