The ornamental design for a hifisystem, as shown and described.
The claimed HiFi system is used for reproducing sound with high fidelity.
FIG. 1 is a front elevational view of a HiFi system showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
The broken line showing of the HiFi system is included for the purpose of illustrating environmental structure and forms no part of the claimed design.