What happened this time?! EQ With a Healthy Side of Hum. So I was on this job site the other day, with the classic set of challenges. The client had bought a high-end 2-channel system from the integrator: Wilson Duette speakers, Linn preamp, Moon/SimAudio power amplifier. After it was all up and running, the client complained there was "not enough bass". So, the integrator sold him a couple of JL Audio subwoofers and asked me to come along and make the whole thing work - setting crossovers, time-aligning the speakers, balancing levels, equalizing the response, and voicing. We used a trusty Ashly ne4400 DSP audio processor; it’s a pro-grade digital audio processor with EQ, crossover, delay, level - the works. When I got to the location, things were a far sight worse than just "not enough bass". The installation of the EQ hadn't gone quite right; they had no audio signal, but a *lot* of hum. Client was steamed. So in I dove. In cases like this, there...