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Properly integrated sub should not be distinguishable from the stereo soundstage.
Big statement, careful with that one!
Different speaker to main system, different response, different amplification, different crossover position, different physical position, chance of facing different direction. Without matching all of that up and/or doing some pretty in-depth dsp it’ll never be well integrated.
badly integrated cheap subs usually sound awful especially if they accentuate room nodes.
That thud thud thud of somebody’s ‘hi-fi’ choice influenced by MDMA and driving round the M25.
I want to hear bass being played just not like it’s in the back of a 3 series BMW...