The speaker also seems to enjoy a boost in overall gain, achieving higher
sound pressure levels (volume) with less distortion.
The tests look for sufficient sensitivity levels to achieve a premium level of audio output, while maintaining minimal distortion at the
required sound pressure level.
Although active noise cancellation reduces the perceived background noise, it adds
extra sound pressure at the expense of sound quality.
The S - Force front surround technology enables 50 per cent
more sound pressure compared to previous Xperia smartphones.
Light, efficient, rigid and impervious to distortion even at
high sound pressure levels, the tweeter's airy, unveiled highs compare with the best home theater surround sound speakers in the world.
The high - end Professional system even uses the most advanced Carver technology able to generate enormous
sound pressure by combining the volume of the right and left subwoofers.
The researchers wanted to determine if the fish could
sense sound pressure waves underwater, so they filled a long metal tube with water and placed a loudspeaker at one end.
Orb says this will deliver fuller high - and mid-range frequencies because the drivers will work together as a single source to
increase sound pressure levels to the listener.
In an April 2014 Pediatrics study, «Infant Sleep Machines and
Hazardous Sound Pressure Levels,» published online March 3, the maximum noise levels of 65 sounds in 14 different infant sleep machines were tested at three distances: 30 centimeters (to simulate placement on a crib rail), 100 centimeters (simulating placement near a crib), and 200 centimeters (to simulate placement across the room).
The researchers repeated the lungfish experiments with the salamanders and found that they were able to
detect sound pressure at frequencies higher than 120 Hz underwater.
Despite having a fully functioning middle ear, these animals sensed
sound pressure even better than their lungfish predecessors.
Josef M. Miller MD, professor in the Department of Otolaryngology at the University of Michigan Medical School, along with Colleen G. Le Prell, and Larry F. Hughes treated guinea pigs with one of the following: vitamins A, C and E; magnesium; A, C and E plus magnesium, or a placebo one hour before and five days after a five - hour exposure to 120
decibel sound pressure level noise (comparable to a jet engine at take - off).
The measurements should be taken during school hours over a suitable time period to be able to quantify the
representative sound pressure level, likely to occur during teaching hours and should include noisy events — such as peak time road traffic, but should exclude rare, intermittent events, such as the mowing of school lawns.
In Track mode, which is exclusively for use on the racetrack, the system achieves its maximum performance - oriented sonority with the
corresponding sound pressure, thus offering a particularly intensive driving experience.
But of course IWTs are not cars and peer - reviewed studies consistently document that IWTs produce sound that is perceived to be more annoying than transportation or industrial noise at
comparable sound pressure levels.
IWT noise annoyance starts at
dBA sound pressure levels in the low 30s and rises sharply at 35 dBA as compared to road noise which starts at 55 dBA.
There is some evidence to suggest that audible noise from wind turbines at
elevated sound pressure levels may be associated with disturbed sleep and negative emotions.
Molded from globes of dense, translucent plastic, the Nova 2.0 not only look cool, but show off a unique vortex design inside, which is designed to efficiently and powerfully
port sound pressure from the drivers up front to a rumbling passive radiator at the rear.
With total harmonic distortion of less than 0.08 percent (at 1 kHz and 100
dB sound pressure level) and thanks to a coil wire made from pure aluminium, the HD 630VB achieves an unaltered sound image with a precise reproduction of voices and instruments in the mid-ranges and brilliant trebles.
The total output volume for iPhone 7 is about 60 %, Lightning EarPods already provide
sufficient sound pressure, and through Lightning / 3.5 mm headphone jack converter the volume then adjusted to about 70 %.
The Megablast is larger and punchier, being billed as Ultimate Ears» «loudest, most powerful and best sounding speaker to date», while the regular Blast is easier to carry around and still pretty loud, hitting a
max sound pressure level of 90 dBC.
With a
maximum sound pressure level of 93 dBC, MEGABLAST is the loudest speaker from Ultimate Ears and is 40 percent louder than Ultimate Ears MEGABOOM.
It's not just improvements via the 3.5 mm headphone jack though, as Sony has also done some work on the front - facing dual speakers of each phone, applying its S - Force Surround technology, which has
improved sound pressure by 50 % from that of their predecessors.
Sony said that S - Force provides 50 percent
greater sound pressure than before, which should mean louder and clearer sound quality.
Add to that an impressive subwoofer of 150 watts and you'll find yourself with a 5.1 sound system that can reach 107 dB, a
fantastic sound pressure.
This time around Sony has implemented a «SmartAmp» that supposedly provides 50 percent
more sound pressure and less speaker degradation over time.
The highly efficient drivers deliver
high sound pressure levels for maximum effect, and distortion is minimized thanks to reduced air turbulence.
All HX Series Speakers feature twin roll edge woofers that create less interference for the woofer projection and provide increased amplitude,
increased sound pressure, and less distortion.
It turned out that I had reached the perfect combination of
sound pressure level and low frequency to cause the Uni-Q driver to flap against the grill in front of it.
To do this, they used geophones to measure seismic vibrations within the ground, which are similar to microphones that pick up acoustical vibrations —
sound pressure — in the air.
Morrison ranged from stakes on the ground to measure the size of the fireball when the explosive energy had stopped and when the expansion of the fire ball was just due to
the sound pressure.
They played sounds into the tube in a range of frequencies and carefully positioned the lungfish in areas of the tube where
the sound pressure was high.
When opposing devices send out surface acoustic waves, they set up a grid of nodes where
the sound pressure cancels out.
Sound pressure and the timing of steps seemed to be coordinated with the songs.
According to the Acoustics of Schools: a design guide, the standard sound power output created by speech is 10 microwatts, which amounts to
a sound pressure level of 60 dBA at one metre in front of the speaker.
The measured quantity is
the sound pressure produced in an acoustic resonator caused by light
Anecdotally, it sounds similar to a jackhammer, however the loudness is between 10 and 20 times
the sound pressure level of a jackhammer (10 to 13 dB greater).
ASC is a related technology designed to improve the engine sound quality by making
the sound pressure level more linear as the engine revs increase.
Typically, engine noise doesn't increase in a linear way with rising revs; instead there can be many resonances that create peaks and valleys in
the sound pressure level and an uneven sound.
Though the system offers benefits from idle to redline, it makes the largest difference in the range between 1000 and 2000 rpm, where it lowers
the sound pressure level with a reverse - phase audio signal.
That said, civil defense sirens at close range (100 feet) or for extended periods that would occur during a disaster can be damaging to the ear drum due to the high decibel (
sound pressure) level required for the warning sirens.
· Driver: Dynamic, 50 mm with neodymium magnets · Type: Circumaural, Closed back · Frequency response: 12Hz — 28,000 Hz · Impedance: 30 Ω ·
Sound pressure level: 104.5 dBSPL / mW at 1kHz · T.H.D.: < 2 % · Input power: Rated 30mW, Maximum 500mW · Weight: 360g · Weight w / mic and cable: 376g · Cable length and type: Headset (1m) + Audio Control Box (2m) · Connection: Headset - 3.5 mm plug (4 pole) + Audio Control Box - 3.5 mm stereo and mic plugs
Riva claims 26 hours of playback at 75db SPL (
sound pressure level), and while that's a bold promise, the Turbo X delivers.
The system's
sound pressure level (SPL) tops out at 99dB at one meter, placing it somewhere between a motorcycle engine and a jet takeoff from the runway.