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Chapter 15: Subwoofer Crossovers > 15.10 Automotive Audio Subwoofers

15.10  Automotive Audio Subwoofers

The loudspeakers fitted as standard to cars have a very limited low-frequency capability because of their small size; they are installed in car doors or dashboards so very little space is available. If some serious bass is required, one or more subwoofers are installed in the boot or back seat space.

Getting decent sound in a car by any means is a serious challenge. The cabin volume is much smaller than the average listening room, and consequently the effects of resonances and reflections are much more severe. Vance Dickason [6] describes the listening space as a “lossy pressure field.” A true pressure field would have perfectly rigid walls, but the thin metal panels of a car are a long way from rigid and Vance points out that this leads to unpredictable variation in the low-frequency response of the space over a 3 to 6 dB range. Simply opening a window (more optional in these days of wide-spread air-conditioning) has a radical effect on the response of the space.


  

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