AVS Forum Special Member
Join Date: May 2010
Location: Greater Houston Area - Texas
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Just now getting a chance to read through the last few pages and I'm very intrigued by the blown tweeters topic. First I want to go over the available information, and please correct me if I have the facts incorrect. The tweeter on a RC-62 II was blown watching Lone Survivor at reference levels during the action scenes. The receiver is rated at 150 watts per channel - whether that is 2 channel driven or all is not stated - and the RC-62 II is rated at 150 watts RMS and 600 peak with a purported sensitivity of 97 db. With his MLP of 9' and all the other parameters listed true, he would need 113 watts to hit reference levels. Now, if the sensitivity level is any less than that, which I've seen some posted claims it is, then it jumps quite drastically. For instance, at 95 db sensitivity it would require 180 watts to hit reference.
So if all specs are accurate, the system would not be under or over powered and there shouldn't be a reason for the tweeters to be blown - pointing to a defective receiver. If specs are inaccurate, it would seem to point at an underpowered amplifier. I'm finding it hard to find an instance that would point to over amplification, but I'm no expert, so maybe someone else can explain.
Klipsch RF-7 II's, RC-64II, RS-62 II's, RS-52 II's
Marantz SR7008 with TK421 Modification
Sony XBR-75x940c with Ideal-Lume Panelight