"I think the audio response could do with a bit of a tweak".
So I modified the mic amp and took the radio out for a road test.
"Mmm, better, but it could still do with a bit more bass".
So I tweaked it again. And again. And again. In fact this faffing went on for about a week, a bit more of this, a tweak to that, so I decided to put a stop to it. The next time I went out with two radios, one modified and one not:
"How was that Kevin?"
"Which one is which?"
"You tell me Kevin"
Reminds me of a similar story I heard from an acquaintance, who is one of the “top engineers” in the world of AM broadcasting. If you know about AM, you’ll probably know of the person I’m talking about. Anyway - he had commissioned the transmitter, antenna and processing for an AM station in the USA. The station owner was delighted with the sound. But a couple of month later, the call came in “Something’s wrong with the processing. It doesn’t sound right”. So my friend flew out to the states, tweaked the settings, owner was happy.
This happened regularly for several years - every few months, the owner would call up, saying the processing was wrong - it was too loud/too quiet/too much bass/too much treble/too much compression/not enough compression etc. Each time, the guru would get on a plane, fly to the US, tweak the processor settings, and the owner would be happy, for a few months. The owner was convinced that someone was changing the settings, or the kit was faulty - but it had been replaced several times, and the settings were unchanged.
Eventually, our guy worked out exactly what the problem was. Every time the owner became unhappy with the settings was just after he had bought himself a new car....