I installed a Stealth on my '08 EC300 a few weeks ago. I perform sound checks for our local club at events, have all the equipment and am well versed in the J1287 Sound test standard. My 300 blew an 85.7 at my house which is about 2000' altitude. We checked it at our last event 2 weeks back at about 5500' and it blew 83.5. I am very happy with the results and well worth the money in my opinion.
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