5 ms·
> When 25 volts of electricity were passed through the device at 1 kilohertz (a rate of 1,000 cycles per second), the speaker produced high-quality sound at con
by dt2m 4y ago
> When 25 volts of electricity were passed through the device at 1 kilohertz (a rate of 1,000 cycles per second), the speaker produced high-quality sound at conversational levels of 66 decibels. At 10 kilohertz, the sound pressure level increased to 86 decibels
Read: Tinny af.
Nonetheless, VERY exciting technology. Will be interesting to watch as it matures.
- cushychicken 4y agoCould likely compensate that with digital EQ, though.
- layer8 4y agoBass frequencies are inherently impossible with that kind of physical design. To move enough air at low frequencies, you need more physical depth (higher amplitude).
- kierenj 4y agoWouldn't the accumulated effect be viable though? I mean, air molecules are tiny, but there are lots of them vibrating in a coordinated way to make bass..
- layer8 4y agoJust compare the surface area and displacement of the actual tiny domes with the surface area and displacement of a bass-capable loudspeaker membrane. If you do the math, I don’t think there’s any chance.
- cushychicken 4y agoSo what? The peaking is at 10kHz. Way outside of bass range.
- dt2m 4y agoTrue, but if the frequency response already drops off that heavily at 1kHz you're going to need some very serious amplification to use it for anything other than speech, even after applying DSP - which I'm guessing defeats the whole purpose of the speaker in the first place.
- falcolas 4y ago20db is a lot of compensate (most consumer grade EQ are limited to 12db in either direction, and human ears are more sensitive at higher frequencies). To work with most existing amplifiers, there would likely have to be an in-line circuit to attenuate the voltage at the higher frequencies.
- cushychicken 4y agoThis comment is almost totally incorrect. 12dB in either direction was standard issue in, like, the 70s. Plenty of modern eqs can do almost 40dB of damping. Human ears are, in fact, way less sensitive at higher frequencies. Review the Fletcher Munson curve. Takes an order of magnitude more power to generate same perceived loudness at 10kHz as 1kHz. This is a piezo speaker, which typically have really different driving requirements than a typical transducer, so it's probably not suited to work with most existing amplifiers anyway. Getting the EQ right is table stakes for getting this production ready. Source: me, I have about a decade of experience in consumer audio.
- falcolas 4y agoIf, by "an order of magnitude", you mean "10db", which works out to be a bit more than 3x the sound pressure required. For comparison's sake, I consider an order of magnitude to be around 10x or more. Exaggerations aside, I could very well be wrong about that part - I was basing my observation off the response curve of reference headphones, which all fall off drastically starting a bit before 10kHz. But since they sound the same throughout the frequencies, I inferred that hearing is more sensitive slightly before 10kHz, since even age-degraded hearing can go above the 14kHz range. > 12dB in either direction was standard issue in, like, the 70s. Look at the EQ provided with your phone's audio application. 12 dB plus and minus. Look at the EQ on your computer. Unless you're using custom software, it's more-than-likely going to be 12db (Spotify, iTunes, WMP, etc.). 40dB of dampening is custom hardware your average sound bar won't have. That your average consumer-grade home theater system won't have. That even a quality headphone amp/dac won't offer. > Getting the EQ right is table stakes for getting this production ready. Here we agree, as I pointed out in the post you're responding to.
- samstave 4y agoImagine audio way-finding embedded into the paint. THen see if yu can place other sensors behind this material as well.
- samstave 4y agoOK, so apparently one doesnt like this, so let me re-phrase: What area in CM(2) is good for fidelity, and to really push the question, how easily does this become a mic? So imagine a sensor the size of a dual gang outlet (https://i.imgur.com/8bAhAnr.jpeg https://i.imgur.com/8bAhAnr.jpeg) which can track a TON of things? Now imagine that face-plate being coated in this material?