Manual Klipsch SWS (page 8 of 12) (English)

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More Fun with More Subs

Multiple subwoofers can be used to increase

sound pressure over a single unit, and efficient

use of room boundaries can additionally increase

sound pressure.

Like any other type of engineering, the art and

science of loudspeaker design often revolves

around overcoming obstacles thrown up by

nature. Every once in a while, however, physics

turns out to be our friend. Subwoofers are a case

in point.

At the frequencies where subwoofers operate, you

can get fairly astonishing increases in maximum bass

output by using multiple subwoofers, placing them

against room boundaries (walls, floor), or both. At

the very lowest frequencies, you even get some boost

just from having the subwoofer in a ro o m .

This last phenomenon is known as "room gain,"

and you actually get more of it in small rooms

than in large ones. Below a frequency determined

by the room volume, a speaker’s output will be

progressively reinforced at a rate close to that at

which its response naturally rolls off below its

lower limit. So a subwoofer that has flat response

to 30 Hz outdoors would hold up strongly to

below 20 Hz in a typical living room. In a typical

bedroom or small office, the boost might begin at

40 or 50 Hz, which dovetails nicely with the

capabilities of the smaller speakers and sub-

woofers that would tend to be used in such set-

tings. Make the room even smaller — well, if you

have been wondering how people get so much

bass out of their cars, here is your answer! A

freer lunch you will not find.

Controls all subs downstream 444444

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Klipsch SWS Manual

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