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JBL SPMKII
Owner's Manual


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  • PDF Format
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  • Language: English
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Description of JBL SPMKII Owner's Manual

Complete owner's manual in digital format. The manual will be available for download as PDF file after You purchase it.

Owner's Manual ( sometimes referred to as User's Guide or User's Manual ) contains information on how to use Your device. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 36 (click to view)
Unfortunately, there is no way to eliminate the effects of standing waves completely. The best that can be done is to minimize their effect through a variety of strategies. STANDING WAVE SOLUTIONS: ROOM RATIOS In new construction, the best way to minimize the audibility of standing waves is to plan for an even distribution of them, so that their effects do not “pile up” on top of each other. In this regard, the ratios of room dimensions are the critical factor. Rooms having equal dimensions are the worst, since the standing waves in all directions reinforce one another. Room dimensions which are even multiples of one another are also to be avoided where possible. STANDING WAVE SOLUTIONS: SPEAKER PLACEMENT Speaker placement also has an effect on standing waves and their audibility. In particular, placement of any speaker (including subwoofers) where two walls and the floor meet will tend to stimulate all of the available standing waves, causing the most irregular response. The displacement required to minimize a particular standing wave depends on its frequency, with lower frequencies requiring more movement owing to their longer wavelengths. As a result, minimizing colorations due to standing waves often requires significant adjustment of subwoofer placement. Leave yourself some latitude with regard to subwoofer placement when planning your system—the final adjustment will probably have to be done on something of a trial-and-error basis. STANDING WAVE SOLUTIONS: ABSORPTION In theory, it is possible to damp standing waves with absorptive material. The difficulty is that the thickness of the absorptive material would have to be approximately one-half the wavelength of the lowest frequency requiring damping. This means a five-foot thickness of fiberglass would be required in order to damp everything down to 100 Hz—not very practical. Standing wave energy tends to be concentrated in the corners of rooms, which is why these are the worst places for subwoofers. Because of this fact, it may be possible to break them up somewhat by “breaking up” the corner. This can be accomplished by placing a column of thick, absorptive materials in the corners (covered by acoustically transparent cloth, of course). The column ought to be at least a foot on a side, and run from floor to ceiling. A variation on this theme is to run an absorptive panel diagonally across the corner, leaving open air space behind it. Neither of these techniques is more than a partial solution, at best, but they are easily tried and sometimes quite effective.

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