What is the most dramatic way of increasing a speaker's Bass and Low mid?

Hi , I’ve had similar issues, but with a different type speaker . I am not able to buy a $4k item for tone , since I currently exist in a Mid-Fi price point . 3 kids with cars and college just ended , so maybe soon . So I purchased the Schiit Loki and have had good results . I’m currently running Zu’s on extremely thick carpet , but get decent Bass . So I tried different spikes and spent $400 on some really nice Timber Nation footers . Unfortunately they killed my sound ( I was really surprised ). I emailed Zu and Sean gave me some suggestions to try . In the end I removed the footers . But contact your speaker builder as they know the best tweaks for their products . I have tube amps and pre , so I was able to adjust my bass by running KT120’s over smaller power tubes . But it’s always give and take . For little or no money you could try digital correction programs on a laptop streaming Tidal . Amarro for example when used on a Mac , will do MQA unfolding and frequency curves prior to your DAC . You can trial it or buy for $100. So on the cheap , the Loki , footers, digital software. Hope this helps, Mike .