Designers of active subwoofers sometimes include a degree of corrective equalization to compensate for known performance issues ( e. g., a steeper than desired low end roll-off rate ).

This resonance compensates for the roll-off of low and high frequencies in the speakers, and evens the tone.

Using acoustical transducers and related instrumentation that set low limits ( 0-50, 000 Hz with roll-off ) will result in errors.

In the control signal path, the dbx Type II process rolls off the high and low frequency response to desensitize the system to frequency response errors – since the roll-off is only in the control path, it does not affect the audible sound.

But during the second half of the century its fortunes reached a low point and when in 1897 Cyrus H. K. Curtis purchased it -- `` paper, type, and all '' -- for $1,000 it was a 16-page weekly filled with unsigned fiction and initialed miscellany, and with only some 2,000 subscribers.

The results of present observations of the thermal radio emission of the moon are consistent with the very low thermal conductivity of the surface layer which was derived from the variation in the infrared emission during eclipses ( e.g., Garstung, 1958 ).

Thus, a low intensity of hypothalamic-cortical discharges prevails in sleep and a high one during wakefulness, resulting in synchronous EEG potentials in the former and asynchrony in the latter condition.

This low BOD was due to removal of the excess suspended solids by sedimentation since the only dilution was surface runoff which was very low during this study.

However, during the January to September 2010 period, the sector experienced a 5. 2 percent year-on-year decrease, which according to the Civilitas Foundation is an indication of the unsustainability of a sector based on an elite market, with few products for the median or low budgets.

It has no permanently dry land area, although large parts of the reef become exposed during low tide.

However, Curie also worked with unshielded X-ray tubes during World War I, and analysis of her skeleton during a reburial showed a relatively low level of radioisotope burden.

The population has remained at a low density for more than 90 years, with additional reductions during the last decade.

Many areas of the province are often covered by a blanket of heavy cloud and low fog during winter, despite sunny summers.

At the same time annual inflation in the economy was variable and during the last five years ( 2003 – 2007 ) has seen a low of 2. 3 % and high of 7. 3 %.

It is variously argued that Fuller's wartime plans and post-war writings were an inspiration, or that his readership was low and German experiences during the war received more attention.

Other historical accounts from 1711, 1825 and 1839, however, point out that the island had a low grassy or suffrutescent ( partially woody ) flora during those periods ( Sachet, 1962 ).

There are about 30 separate reefs and atolls, twelve being wholly submerged or drying only during low tide, and 18 others with a total of about 51 islets and cays ( 18 alone on the atoll Lihou Reef ), some of which are vegetated.

The inflation rate was also kept low during his term.

For instance during Operation Enduring Freedom the United States attacked targets of very low monetary value with cruise missiles, which led many to question the efficiency of the weapon.

Beds are flooded in the autumn to facilitate harvest and again during the winter to protect against low temperatures.

The field of cryogenics advanced during World War II when scientists found that metals frozen to low temperatures showed more resistance to wear.

The low temperature during treatment is advantageous in that it doesn ’ t have any negative effects on the steel, such as annealing.

Either type of frog would appear biochemically inactive ( i. e. not living ) during dormant periods to anyone lacking a sensitive means of detecting low levels of metabolism.

Some fires are caused by lightning, but these are usually during periods of high humidity and low winds and are easily controlled.

The low demand from the military market during the 1920s forced DAT to consider merging with other automotive industries.

As with the rest of the British Isles and South West England, the area experiences a maritime climate with warm summers and mild winters-this is particularly pronounced due to its position near the coast-extremes range from a record low of just in January 1987 up to a record high of during June 1976.

As well, the low " E " strings used during the 19th century were thick cords made of gut, which were difficult to tune and play.

Geiger detectors are still used as a general purpose alpha / beta portable Radioactive contamination measurement and detection instrument, owing to their relatively low cost, their robustness and their relatively high detection efficiency ; particularly with high energy beta particles.

The precise level of glucose considered low enough to define hypoglycemia is dependent on ( 1 ) the measurement method, ( 2 ) the age of the person, ( 3 ) presence or absence of effects, and ( 4 ) the purpose of the definition.

Determining the presence of both parts of this definition is not always straightforward, as hypoglycemic symptoms and effects are vague and can be produced by other conditions ; people with recurrently low glucose levels can lose their threshold symptoms so that severe neuroglycopenic impairment can occur without much warning, and many measurement methods ( especially glucose meters ) are imprecise at low levels.

Because of all of the statistical and measurement variations listed above, the Endocrine Society recommends that a diagnosis of hypoglycemia as problem for an individual person be based on the combination of a low glucose level and evidence of adverse effects.

While most other necklaces are simply referred to by their physical measurement, pearl necklaces are named by how low they hang when worn around the neck.

The power dissipated in a thermistor is typically maintained at a very low level to ensure insignificant temperature measurement error due to self heating.

It is now known that when using a measurement device with a low enough energy output, the uncertainty principal does not always apply.

When particles are measured using a low enough energy measurement device, the energy of the measurement device is not enough to cause the uncertainty principal and thus the ' observer effect ' is not a factor.

However, due to their often extremely low values, measurement can be rather difficult.

This four terminal measurement technique is called Kelvin sensing, after William Thomson, Lord Kelvin, who invented the Kelvin bridge in 1861 to measure very low resistances.

Resistance measurements, in particular, are of low precision due to the typical resistance measurement circuit which compresses the scale heavily at the higher resistance values.

In the measurement of loudness, for example, an A-weighting filter is commonly used to emphasize frequencies around 3 – 6 kHz where the human ear is most sensitive, while attenuating very high and very low frequencies to which the ear is insensitive.

Simple ohmmeters cannot measure low resistances accurately because the resistance of their measuring leads causes a voltage drop that interferes with the measurement, so more accurate devices use four-terminal sensing.

LEDs were better suited to the low voltages that integrated circuits used, which was an advantage for devices such as pocket calculators, digital watches, and handheld digital measurement instruments.

The low reflection coefficient means better measurement accuracy.

Their blood sugar level, measured by a glucose meter or laboratory measurement at the time of discovery, is usually low but not always severely, and in some cases may have already risen from the nadir that triggered the unconsciousness.

Over the period of the flight the drift would be so low that any inaccuracies introduced by the drift could account for a maximum of 1 % of the warhead's final accuracy-the rest would be due to downstream issues like the measurement of the firing of the rocket engines, minor differences in warhead construction, and unavoidable randomness in the atmosphere.

Because the measurement of a static signal is prone to noise and drift, low stiffness cantilevers are used to boost the deflection signal.

Problems with the technique include no direct measurement of the tip-sample separation and the common need for low stiffness cantilevers which tend to ' snap ' to the surface.

The buoyancy of air is neglected for most objects during a measurement in air because the error is usually insignificant ( typically less than 0. 1 % except for objects of very low average density such as a balloon or light foam ).

There are no similar loudspeaker power handling measurement methods in the US ; the problem is much harder as many loudspeaker systems have very different power handling capacities at different frequencies ( e. g., tweeters which handle high frequency signals are physically small and easily damaged, while woofers which handle low frequency signals are larger and more robust ) in addition to the previously cited great variation in the power levels inherent in musical signals presented to a loudspeaker.

R52 building also previously contained a 5 ' open jet low speed tunnel, originally built as a sub-scale prototype for the larger 24 ' tunnel, but subsequently modified for use as a noise measurement facility.