![]() ![]() A capacitor between the power amp and the tweeters is shown to protect the tweeter-optional but recommended unless you are certain that your amps are well-behaved enough and/or your tweeters are robust enough to withstand any turn-on or turn-off “thumps.”įigure 1. The DAC outputs are connected to stereo amplifiers for the woofers and tweeters, and to the subwoofer amp. The music computer is connected to a multi-channel DAC via USB or FireWire. I’ve also shown a “global EQ” Pro-Q block before the crossover, which will be used to provide overall response shaping. Internally to the computer, Pure Music is responsible for playback of the music file and for the crossover itself, while the FabFilter Pro-Q plugin is used to equalize each crossover output. System configurationįigure 1 shows the overall system configuration. I’ll assume that you’re already familiar with playing music on the Mac and have a library set up (if not, see my Getting Started guide), and have learned how to use Pure Music for regular two-channel playback. This configuration demonstrates all of the key points without being unnecessarily complex. In this tutorial, I’ll be setting up a two-way speaker with a single subwoofer. Pure Music does not have equalization built-in but it does support plugins, so I’ll use FabFilter Pro-Q. ![]() Few loudspeaker drivers are perfectly “flat,” so equalization (or response shaping, if you prefer) is essential if you want an accurate loudspeaker. The crossover fulfils one of two key processing functions in an active speaker, that of “splitting” the signal into frequency bands for the various loudspeaker drivers (tweeter, woofer, subwoofer, in this article). One of those features is its active crossover, which can be used to implement an active speaker system of up to four ways. Combining the music player and the active crossover in this way has some key advantages – it takes advantage of CPU power that’s already there on your music computer, and it’s able to use high-precision floating-point arithmetic for the filter calculations, ensuring minimal processing artifacts added to the signal. ![]() Of the music players available for the Mac, Pure Music stands out as the one with the most comprehensive feature set. ![]()
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