I don't own a 990 but is this the same issue as the 950 as described here?: http://ubb.outlawaudio.com/ubb/ultimatebb.php?ubb=get_topic;f=15;t=001289
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950/7100/LFM-1
Tyler Acoustics Freedom F3,F1,FC1
Panamax M-4300
Auralex MoPADs & GRAMMA