Elliott Sound Products - The Audio Pages (Main Index) Crossovers. --- Crossovers --- Linkwitz/Riley --- Active filters --- It is practically impossible for a single radiator to cover the 20 Hz to 20 kHz audio frequency range at adequate sound pressure levels (SPL) and with wide dispersion off-axis. At a 50 Hz bass frequency, for example, it takes an air volume displacement of 214 cm3 to generate 90 dB SPL at 1 m distance from the source in free space. Take a typical 6.5 inch (132 mm effective) diameter driver and its cone would have to move 14 mm peak-to-peak linearly, which by far exceeds its excursion capability (Ref. 4).
At 1000 Hz, though, the same driver would have to vibrate only with (50/1000)2 = 1/400th of this excursion for the same 90 dB SPL, but now the cone is in its breakup region and no longer acts as a rigid piston, causing energy storage and deteriorating off-axis radiation. I have a strong preference for line level active dividing networks ahead of the power amplifiers (Ref. 2, 12, 17). Crossover topology mistakes. Aanbesteden Prorail. ProRail publiceert per 1 april 2013 de aanbestedingen op TenderNed (www.TenderNed.nl) en niet meer op deze aanbestedingssite. Voor meer informatie en overige nieuwsberichten, zie tablad Info - Nieuws Welkom op het electronische aanbestedingssysteem van ProRail. Onder de linker menuoptie Aanbestedingen vindt u informatie over alle aanbestedingen van ProRail. U kunt vervolgens een keuze maken uit Bekendmakingen, Inschrijfresultaten, Gunningen en Afgebroken/mislukte aanbestedingen.
Onder Bekendmakingen zijn alle opgestarte aanbestedingsprocedures opgenomen. U kunt daar per aanbesteding de selectieleidraad en het aanmeldformulier downloaden. NB het aanmeldformulier wordt via een pop-up zichtbaar, zorg dat pop-ups van onze site (tijdelijk) toegestaan zijn. Onder de menuoptie Info zijn nieuws, enkele documenten en informatie over dit systeem opgenomen. Algemene informatie over ProRail en meer Business to Business informatie over ProRail vindt u op www.prorail.nl/zakenpartners.
Index. Eindelijk een geluid dat als muziek in de oren klinkt | luidspre. Quot;How Speakers Work" Quot;How Hearing Works" Your ears are extraordinary organs. They pick up all the sounds around you and then translate this information into a form your brain can understand. One of the most remarkable things about this process is that it is completely mechanical. Your sense of smell, taste and vision all involve chemical reactions, but your hearing system is based solely on physical movement.
In this article, we'll look at the mechanical systems that make hearing possible. We'll trace the path of a sound, from its original source all the way to your brain, to see how all the parts of the ear work together. When you understand everything they do, it's clear that your ears are one of the most incredible parts of your body! To understand how your ears hear sound, you first need to understand just what sound is. An object produces sound when it vibrates in matter. When something vibrates in the atmosphere, it moves the air particles around it. To see how this works, let's look at a simple vibrating object: a bell.
Luidspreker. ATRIUM Speaker Systems, high-end design speakers - a u d i o - c u b e