jimman2—Oh boy! I don't think that I've actually heard 20kHz (10kHz? 8kHz?) in more than 50 years! And probably more!
My comment about 20kHz was not related to its significance, but rather to the technical fact that 20kHz is the frequency beyond which Philips and Sony compromised CD high frequency response against cost. It's "baked in" to the "Red Book" CD specifications. (Refer cleeds' comment about that compromise.) I consider flat response to 20kHz to be more than sufficient, but some (perhaps many) audiophiles definitely do not. They want digital files far in excess of the "Red Book" CD standard.
I agree with you concerning speakers. You can design good or bad speakers regardless of whether sealed or ported. But my sweeping generality is applicable: Sealed speakers will provide a smoother and more natural bass falloff than ported reflex speakers, but ported speakers will extend deeper (go lower in frequency) than the equivalent sealed enclosure speaker. The key here is "equivalent". This is just a basic "given" in the course of speaker design compromise.
My comment about 20kHz was not related to its significance, but rather to the technical fact that 20kHz is the frequency beyond which Philips and Sony compromised CD high frequency response against cost. It's "baked in" to the "Red Book" CD specifications. (Refer cleeds' comment about that compromise.) I consider flat response to 20kHz to be more than sufficient, but some (perhaps many) audiophiles definitely do not. They want digital files far in excess of the "Red Book" CD standard.
I agree with you concerning speakers. You can design good or bad speakers regardless of whether sealed or ported. But my sweeping generality is applicable: Sealed speakers will provide a smoother and more natural bass falloff than ported reflex speakers, but ported speakers will extend deeper (go lower in frequency) than the equivalent sealed enclosure speaker. The key here is "equivalent". This is just a basic "given" in the course of speaker design compromise.