Well, it seems that mkI's are somewhat of a questionable quality. I am running somewhat of a torture test of the two MkII in separate loops, in a makeshift radbox (just in case). The pumps have been running for a full month, today, without shutting off, and so far not a single change in sound let alone a failure (crosses fingers). So I'm going to try to contribute to this thread with a drop of optimism.
Right now I'm debating whether I should run these 'til they give up and than open them up and take a look inside or maybe finally turn them off and inspect the innards. The thing is I just can't do that this weekend. To busy with other things. Maybe next week. We'll see.
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