Set the Audio Output Module to Cubeb or SDL2 , and reduce the latency slider as low as your CPU allows without causing audio crackling.
However, the "Best" status of EMPRESS is secured by its soundtrack. The song list is widely celebrated for its diversity and high quality across multiple genres. It features a barrage of heavy-hitting boss tracks that define the IIDX experience, such as the frantic by L.E.D., the soaring "THE DEEP STRIKER" , and the legendary "gigadelic" (which appeared in various forms but became a staple in this era).
The Ultimate Guide to Beatmania IIDX 16 EMPRESS ISO: Legacy, Setup, and Emulation
From community consensus (Reddit r/bemani, Discord, PCSX2 forums), a “best” EMPRESS ISO usually:
Beatmania IIDX 16 Empress + Premium Best ISO: The Ultimate PS2 Experience
Beatmania IIDX 16: Empress remains one of the most beloved entries in Konami's long-running rhythm game franchise. Released in arcades in 2008 and later brought to the PlayStation 2, Empress is celebrated for its iconic pink aesthetic, legendary tracklist, and refined gameplay mechanics.
Introduced in Empress, this mode converts almost all keys into scratches, altering the gameplay significantly. Refined Interface: Features a pink, high-luxury aesthetic.
Released in arcades in 2008 and ported to the PlayStation 2 in 2009 (exclusively in Japan), Empress is widely considered the "end of an era." It was the last mainline IIDX title to appear on the PS2 before the series transitioned to the KONAMI Arcade Championship (KAC) era and subscription-based PC releases. Today, searching for a configuration is a rite of passage for enthusiasts who want to experience this legendary tracklist without tracking down rare, region-locked discs.