Audio Video

Match an amplifier to passive speakers with confidence: compare continuous ratings at the right impedance, leave headroom, avoid clipping and set gain so the…

What a DSP amplifier adds to a distributed audio system: speaker EQ presets, high-pass filters, limiters, delay and routing for ceiling and outdoor zones,…

Paint in-ceiling and in-wall speaker grilles without losing sound: remove the grille and scrim, prime the metal, spray thin coats, keep every perforation clear…

Why an in-wall volume control buzzes or hums, and how to fix it: transformer vibration on bass, the impedance setting, loose plates and brackets,…

Original, original inside or compatible? How projector lamp types differ in bulb, housing, brightness and life, what US warranty law says about aftermarket lamps,…

Where to put a soundbar’s subwoofer: corner or front wall, why room modes change the bass, how to do a sub crawl, which settings…

Is a subwoofer cable different from an RCA cable? What the label changes, when an ordinary lead works, how to handle long and in-wall…

Choosing between a 2 post and 4 post rack: how each carries equipment, depth and rails, centre mounting, floor anchoring and seismic bracing, cable…

Studs in the wrong place, made of steel or missing? How to mount a TV without studs using wide plates, toggles, steel stud kits,…

Why a multi-zone or 70V amplifier goes into protect mode and the order to find the cause: shorted speaker runs, too low a load,…

When an in-ceiling speaker needs a back box and when it does not: bass consistency, sound between floors, attic insulation, fire-rated ceilings, and the…

Track down the hum in an AV system: unplug sources one at a time, fix cable TV coax loops with an isolator, use audio…