Too much Sony.
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@giantsalami I don't think it's the volume - it seems like it's too powerful in the low frequencies. Mids and highs are just fine.
@russ69 Yeah it's as old as I am so I know I'm probably expecting a lot. Judging by the user manual it's not the original cartridge at least. What causes a cartridge to wear out though? Just regular wear and tear over the years?
Since that cartridge is essentially one out, it could be a number of things within it. Anything from the suspension being worn out to the actual stylus to simply corroded internal wiring. Those cartridges are pretty achieved if you want to go that route, but there's some comparable priced - about $50 or so - MM cartridges that will easily sound better.
Your table has a built-in phono stage. If connected to the phono input of your amp then the turntable must be set to PHONO. https://www.sony.com/electronics/support/audio-components-turntables/ps-lx7/articles/00032249 Otherwise, if the turntable is set to LINE then the signal is going through RIAA equalization and preamplification twice. The result will be way too much bass, and probably distortion too, since the level will be way too high for the phono stage.