Hi, it's been a bit, but I received an update from my son. He decided to reconnect the leads back to the speaker wires that we originally wired the sub up to, and where causing the pulsing sounds in both the sub and the right front speaker, and what do you know ... the sub works perfectly now. Go figure ... I know we disconnected and reconnected those speakers at least 10 times when we installed it originally, trying to eliminate the noise ... I guess the 11th time was the charm!

Thanks for the help.
PS We moved the sub to be within 4" of the rear of the trunk too.