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Old audiophile wife's tale... like most - with a grain of truth. If you have an undamped loudspeaker - it will likely have a higher and "peakier" impedance curve at its bass frequencies... An amplifier loudspeaker higher output impedance (low damping factor) will have a greater alteration in it's frequency response compared to a low output impedance (high damping factor) Amplifier. Whether these diferences in low frequency response is detrimental or beneficial (or neither) is up for grabs, however, because the frequencies where this occurs in in the room mode area where there can already be amplitude variations many times the somewhat minor alterations this effect has. The other scenarios, Low impedance Amp, High Q speaker? That's discussed above, less likely to have a chance to mess things up, but also less likely to have "magical" synergy with room acoustics. High impedance Amp, Low Q speaker? The low Q speaker has a broader impedance hump so the frequency response alteration is likely to also cover a broader range - this is usually a "dip" in the response -which may make the loudspeaker sound marginal "Weaker" in the base. This could easily be adjusted by perhaps moving the speaker a little closer to the wall. Low impedance Amp, Low Q Speaker - Again the low impedance amplifier - gives you a "Truer" (not necessarily better) frequency response. This is the "engineers" choice - take this combo and add a nice parametric EQ and let you adjust the sound to your preference. Why audiophiles are mostly so "anti-eq" is beyond me. Many high end subs and full range with amplified woofers are now providing some form of auto-eq to their systems. This is very good IMO.

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