From yr description the offensive recordings suffer from "sibilance" (~6-9kHz).
Unfortunately, unless you use an equalizer, there is little else you can do to correct this situation. This is a unit placed between your source & the amp (or amp->speakers)
BUT active equalizers are typically abysmal sounding and do more harm to the sound than good -- bar a few outrageously expensive ones.
Generally speaking using one is like shooting yself in the foot given your efforts to put together a nicely balanced, great sounding system.
One patch solution is to use zip cable as an equalizer: these cables typically lose high frequency response and may tame the sibilance.
Unfortunately, unless you use an equalizer, there is little else you can do to correct this situation. This is a unit placed between your source & the amp (or amp->speakers)
BUT active equalizers are typically abysmal sounding and do more harm to the sound than good -- bar a few outrageously expensive ones.
Generally speaking using one is like shooting yself in the foot given your efforts to put together a nicely balanced, great sounding system.
One patch solution is to use zip cable as an equalizer: these cables typically lose high frequency response and may tame the sibilance.