Sixty system slots: five quality tiers (Lo → Hi) crossed with six listening philosophies and six fixed mandates, each resolved in both directions — forward (source-first) and aft (speaker-first). Every pick on every page was derived offline by the frozen engine and baked into this site at build time.
Philosophy slots
Open architecture: integrated, power and mono amplification compete per slot.
Mandate slots
Fixed-architecture briefs (MA–MF), each pinned to a stated remit.
60 slots · 23 chains carry an ER-alternative panel (on 22 pages) · catalogue schema version 2.