Yes, reducing the subnet mask (e.g., to /28) will have the same potential benefit for sound quality and noise isolation even within a VLAN setup. Whether you're segmenting your audio network via VLAN or by address range, limiting the number of possible connected devices reduces broadcast traffic and potential interference — both of which can help minimize network-related noise in high-end audio systems.
Combining VLAN isolation with a narrow subnet range is a solid approach for maximizing audio performance.
Best regards,
Marcin
