Power Amplifiers

Match the amplifier's continuous RMS power per channel to your speaker's recommended power range and impedance (ohms); ensure the amp delivers slightly more headroom than the speaker's nominal rating and that the amp supports the speaker impedance (commonly 4–8 Ω)

Class A offers linear amplification and low distortion but low efficiency and high heat; Class AB balances sound quality and efficiency and is common for home and live use; Class D is highly efficient with compact size and is suitable for subwoofers and portable systems though sound characteristics can vary by design

Look for input types compatible with your source (RCA, XLR, 1/4"), speaker binding posts or Speakon outputs for secure connections, gain controls, protection indicators, bridged/mono mode if needed, and cooling mechanisms like fans or heatsinks for reliable operation

For small rooms or background listening, lower power (tens of watts per channel) can suffice; for larger rooms, live sound, or bass-heavy use, choose higher power (hundreds of watts). Consider headroom and speaker sensitivity: higher-sensitivity speakers require less amplifier power to achieve the same loudness

Yes—most amplifiers specify a recommended load range; driving an amp with lower impedance than rated can cause overheating or protection shutdown, while higher impedance typically reduces delivered power. Always follow the amp's impedance guidelines and wiring diagrams for series/parallel speaker connections

Keep vents and fans clear of dust, maintain proper ventilation and ambient temperature, use clean signal and speaker cables, avoid clipping by not overdriving inputs, and periodically check connections and mounting hardware for secure contact

Price generally reflects power rating, build quality, thermal design, connector types, and feature set (balanced inputs, DSP, protection circuitry); budget models often offer basic functionality under $100–$200, while higher-end or professional units with more power and features command higher prices