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A passive radiator speaker uses a second passive driver, or drone, to produce similar low-frequency extension, or efficiency increase, or enclosure size reduction, similar to ported enclosures. Small [28] [29] and Hurlburt [30] have published the results of research into the analysis and design of passive-radiator loudspeaker systems. The ...
T1CAZ-5 = 4,800 cartridges of .30 Carbine Ball M1, Grade R, in 50-round cartons, 16 cartons per M6 ammo can (800 rounds), 3 × M6 ammo cans per rectangular cardboard box (2,400 rounds), 2 vertically-stacked cardboard boxes per metal 20mm Autocannon MK 1 MOD 0 ammo box.
Size comparison between 30×170mm and 5.56x45mm NATO. The 30 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm (STANAG 4624), the Soviet 30×155mmB, 30×165mm and 30×210mmB, the Czechoslovak 30×210mm, the Yugoslav 30×192mm, the British 30×113mmB, and the French 30×150mmB and 30×170mm cartridges.
The 3.7 cm Br Sprgr Patr 40 L/4.1 Lh 37M was a high-explosive round with an incendiary filling while the 3.7 cm Sprgr Patr 40 L/4.1 Lh 37 lacked the incendiary fill, but was otherwise identical. Tracers were available in red, yellow or white and were marked on the shell by a painted band of the appropriate color.
A typical factory measurement tolerance for is ±20–30%. M m s {\displaystyle M_{\rm {ms}}} Measured in grams (g) or kilograms (kg), this is the mass of the cone, coil, voice-coil former and other moving parts of a driver, including the acoustic load imposed by the air in contact with the driver cone.
The 37 mm M9 autocannon was a derivative of the 37 mm M1A2 flak gun and used the longer, more powerful 37×223mmSR cartridge. Compared to the M4, the M9 had 50% more muzzle velocity (3,000 fps) from a 78-inch barrel (vs. 65-inch in M4), and was twice as heavy (120 vs. 55 pounds for the barrel alone); the whole M9 weighed 405 pounds vs. 213 of ...
Electronically they are identical, but the speakers are moved to the opposite lid. The case dimensions were approximately 37 by 15 by 3 inches (940 mm × 381 mm × 76 mm). When the guitar is stored inside the case, with the speaker cloth facing upward, the guitar neck would sit on the left side of the amplifier. [4]
In some arrangements, loudspeakers are also mounted on a sound box to enhance their output, particularly bass speakers. One notable example of this arrangement is called the bass reflex enclosure. However, in these cases the box resonance is carefully tuned so as to make the sound more equal across frequencies, rather than to impart a ...
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