Many HT receivers will digitize analog input signals to apply the DSP effects like stadium modes, then pass the resulting digital stream to an internal DAC and on to the power amplification section.
If you are using vinyl or a high-end CD player with a better DAC than the receiver, this dual conversion completely defeats the purpose and you are better off getting a purely analog preamp, even if it is just a passive attenuator.
Most Yamaha receivers have a "processor in" 5+1 input that bypasses this internal DSP entirely. If you have it, I would recommend you use it. Unfortunately, you can only use a single source with it.
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