Listen to one speaker at a time with music that has full frequency range and good spectral balance. Kick drum, bass, guitar, keyboards for lows, guitars, voices for midrange and cymbals for high frequencies. Play at a level you can put your ear close to each driver to see if sound is coming from them. Then, sit on axis, about four feet back with each tweeter at ear level (again listening to each speaker in mono) and evaluate it at higher SPLs, listen for spectral balance and distortion. Use an SPL meter to see if the level from each speaker is the same i.e. set level calibration with pink noise. If your AVR levels are radically different for one speaker, it may have problems.
Sweep tones are good to hear cabinet and driver resonances and distortion, but you must control the level as the sweep goes from low to high frequencies to avoid damage to drivers and your ears. Pink noise can be telling, play it at all levels up to the loudest you can stand or what the speakers can handle without incurring damage to drivers. I have an old test CD that has band limited pink noise that is very handy to hear pink noise through individual drivers. I used it to find a problem with a crossover in a 4 way speaker. A loose wire on a crossover board was allowing low frequencies to pass to the tweeter and causing distortion.
Last edited by Rex Anderson; 11-11-2019 at 12:01 PM.