Answers: Specs plan nothing lacking defining factors. If your amps specs speak .5% THD with no limiting factor such as @?watts RMS it channel nothing. It could enjoy .5% THD at 1% rated power and 20% THD at full rate power. So, yes, lower THD is better, but without a limiting factor it is approaching someone saying thier motor can do 200. 200 what? miles per hour, kilometers per hour, 200 feet per minute beside a friend pushing it downhill. A lot of companies will try to entice the novice next to numbers that look good on the box, but within reality, are no indication of the indisputable world performance of the product.
Strictly discussion about THD or Total Harmonic Distortion--you want it as low as possible. Although, i reflect more realistic numbers may be 0.07% which is a rate THD percentage for Harmon Kardon's AVR-146... or 0.09% for Pioneer's VSX-1016TX. 0.5% THD is pretty high for a addressee. However, i remember seeing a 0.1% rating for a Sony a year or so ago. THD in the Pioneer is rate at 8-ohms for instance.
You Math Tip for the day...
0.5% > 0.1% > 0.09%... the minor THD rating [theoretically], is better.
THD doesn't really matter when it comes to subs.... you won't hear the difference between .1 or .5 to be honest.
Music is dynamic so its pretty strong to notice distortion anyway.... if you listen to a tone you can hear it well but you can have duplicate amount in music and not become aware of.
Good Luck
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