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I'm in the process of learning about building speakers myself, and noticed that there isn't a single speaker driver that is marketed to have frequency response ranges that drop to as low as 20Hz. I think the lowest that I've seen is in the ballpark of 30Hz.

Sony markets their devices to have frequency response ranges to go as low as 20Hz.

I own two products of theirs, both having frequency response ranges from 20Hz, to 20kHz. I play a 20Hz tone, and sure enough, I can hear something.

But on my MacBook Pro, I don't hear anything. So, I guess Sony is doing something right. Or perhaps it's all marketing.

If I understand it correctly, as frequencies drop below a certain point, it's not like the volume cuts off abruptly. Instead, I believe that it's a gradual drop in volume, and we should have the opportunity to throw in an equalizer to boost the lower frequencies. But that's just a guess.

I'm new to building speakers, and I would like to learn more in the ballpark of what Sony (and others) is doing for them to confidently market their products to have such frequency ranges.

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Engineering.

Speaker manufacturers have research and development departments staffed with engineers that spend a lot of time to develop crossovers (capacitors,resistors and coils) in conjunction with drivers that can be tailored to play a lot or a little of the sound wave spectrum.

Your Macbook is unlikely to have anything other then just a VERY small speaker, Very small speakers without a crossover in a VERY small space can not reach the low end of the spectrum.

Understanding Loudspeaker Frequency Response

Building a Do-It-Yourself Loudspeaker Design

The truth in spec sheets on speakers has long been very dubious.

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