radix
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It's an old euro model pioneer lx 53, sold as VSX 33 in the US. I still a good receiver, definitely old can't do 4k, no sub EQ but it still works.
Did you see this in the Pioneer manual?
Speaker Setting Use this setting to specify your speaker configuration (size, number of speakers and crossover frequency)2 . It is a good idea to make sure that the settings made in Automatically conducting optimum sound tuning (Auto MCACC) on page 37 are correct. Note that this setting applies to all MCACC presets, and cannot be set independently.
SW – LFE signals and bass frequencies of channels set to SMALL are output from the subwoofer when YES is selected. Choose the PLUS setting if you want the subwoofer to output bass sound continuously or you want deeper bass (the bass frequencies that would normally come out the front and center speakers are also routed to the subwoofer).2 If you did not connect a subwoofer choose NO (the bass frequencies are output from other speakers).