Oct 19 Love0 Does Your Socket Suck? It’s Time to Get a HiFi. Hear it from Jessica. By julie alley AK, Biodesigns, biomechanics, HiFi, Lower Extremity, Prosthetics, Socket Technology Jessica, an above knee amputee, struggled with finding a socket – until she found the HiFi. “The HiFi is amazing.” “Get out of my way when I’m on this socket.” “This is what you need.”