A very small number of high frequency Watts goes much further than a similar number of Watts at low frequencies, partly due to the way the ears and brain perceive sound. They don’t need to pump much air as the rules for electro-acoustic efficiency stack up in a different way. Tweeters have different physical characteristics, though the fundamentals are similar. Low frequencies need drive units capable of moving plenty of air, which means drivers with large area diaphragms with lots of fore-aft travel in their suspensions to pump the air, and hefty magnets to provide the motive force. The reasons why speakers are designed this way are straightforward enough. But the idea of specialisation, using a combination of drive units, each dedicated to a particular band of frequencies, is common to virtually all loudspeakers at all price levels. There are variations of course, for example there may be an additional dedicated drive unit to reproduce middle frequencies, but it is important to understand that more may not necessarily mean better as any theoretical advantages are likely to be outweighed by the additional complication. Typically they will have one or more large drive units to cover the low (bass) frequencies, and a single smaller unit to reproduce the treble. Loudspeakers divide their output into frequency bands. Understanding The Pros and Cons of Ribbon Tweeters
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