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Would the sound of the headphones be better if I put an additional speaker in each cup?
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I have some closed-back headphones that have poor sound. Is it possible to improve the sound of the headphones by installing additional speakers?
How much better can the sound of the headphones be if the cups are covered with soundproofing tape?
Half the battle with headphones tends to be isolation. If you have decent sounding speakers but bad isolation you have mediocre at best headphones. Typically replacing the ear cups can be an option but adding speakers likely won't yield additional quality. Unfortunately if the speakers that already are in the headphones aren't up to snuff there won't be a whole lot you can do. It's important to make sure we're talking about the actual headphones though and not the audio amplifier or the source audio.