"This special J&M/Harley Infotainment radio FLASH will lower the output of the radio itself, flatten out the internal EQ settings, activate the plug-in rear output channels, activate front/rear fader control, maintain Bass/Treble/AVC controls & optimize the overall output signal ,,,,,,,,,,,,,,,, for use with J&M ROKKER & Performance series amplifiers, along with most other non-Harley brand amplifiers."
Why lower the output of the radio itself unless you are using the high level inputs? I'm using a fairly generic Metra line level converter and I've scoped my radio output only and there isn't any clipping until I hit volume level 15 and even then it is minimal clear up to max volume.
I respect that you want to drive business to your company, but my recommendation doesn't change. If the dealer has never flashed your radio, and you're running software version 1.19.1 there isn't any harm in properly setting your gains and then giving it a ride before dumping any more money into the audio system.
I've had my stereo / amp combination on an oscilloscope for literally hours and I know what my measurements and my ears are telling me. I'm just not convinced that spending another $75 or more is worth the investment. If you know how to set your gains and adjust your amp frequencies you can get a reasonably good sounding audio system without spending a grand or more.
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