When guitarists describe the sound of their guitars, a lot of terms are used.
What does a guitarist mean when they talk about top and bottom end?
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Top end refers to the treble tones on your guitar and bottom end refers to the bass tones; these are also referred to as 'highs' and 'lows'; and can be adjusted using the EQ on your amp.
DRL's right but, just for completeness, some occassionally use it to describe the overall quality of the sound. "It's a low-end guitar but it sounds top-end," etc.
Low End = bass
Top End = treble (high end, etc.)
The terms describe the frequency domain of a tone.