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Pair amplifiers and speakers using RMS power ratings, impedance compatibility, and headroom targets. Includes the scoring thresholds Build HiFi uses for compatibility verdicts.

Plan a stereo system that fits your room, budget, and listening habits. Covers component roles, signal flow, matching guidelines, and upgrade paths.

How to connect a powered subwoofer to a stereo system: dedicated sub outputs, speaker-level loop-through, line-level passthrough, and when each method applies.

Match amplifier power to your speakers using sensitivity, impedance, and room size. Includes wattage tables and headroom formulas.

How to position bookshelf speakers for stereo imaging and bass accuracy. Covers boundaries, sweet spot geometry, coupling vs isolation for stands and floors, turntable separation, and first reflection points.

Match amplifier impedance ratings to your speakers. Learn about 4Ω stability, current delivery, damping factor, and failure cases.

How audio travels from your sources to your speakers: a canonical explanation of stereo signal flow.