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My move to IEMs was interesting. I soon realised that there was simply no need to have them very loud because I had proper moulds so my experience was that it was much nicer and quality was always compromised for volume. At the time I started using them, I'd got a big wedge, and my bass went through an 8 x 10" cab, often turned up very loud so I could hear it on stage. I knew for certain, I needed to hear the thud against my body. I was totally wrong! I started turning it down, and didn't notice. Nor did the rest of the band, and then I did a few gigs with it on 0, and still nobody noticed, because my bass was a source on their IEM mixer. Then I did a gig without it on the stage, and the keys player said he needed it as it was how he felt the bass and I pointed out it hadn't been on for a few weeks. From that moment, I knew IEMs were the best. Oddly - one channel on the mixer was an audience mic, and I didn't need that I discovered.