August 2012
Intermediate to advanced
608 pages
17h 15m
English
Content preview from The Design of Active CrossoversBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 6
Subtractive Crossovers
6.1 Subtractive Crossovers
What you might call the standard crossover architecture has a lowpass filter to generate the LF signal for the bass drive unit, and a corresponding highpass filter to create the HF signal for the tweeter/midrange driver. (Obviously that only describes a two-way crossover and a three-way crossover has more filters.) That is not, however, the only way to do it, and one of the alternatives is the subtractive crossover. In this you just have one filter, say the lowpass which gives the LF signal, and you make the HF signal by subtracting the LF signal from the original input, so that HF = 1 − LF. This process is illustrated in Figure 6.1, which shows a first-order subtractive crossover. ...
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