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Re: Inside modern crossovers/signal processors..Is there a digital "protocol" and other questions

193.253.27.66

Posted by pierre-henri on November 17, 2001 at 09:21:00

In Reply to: Inside modern crossovers/signal processors..Is there a digital "protocol" and other questions posted by topogon on November 16, 2001 at 02:08:27:

Hi,

The advantage of digital processing compare to analog when talking crossover is that whatever slope and EQ you use in the digital domain you won't have any phase shifts which are really a problem in the analog domain. Another interesting point is that digital crossovers allow you to introduce delay on some outputs of your filter which allows you perfect time aligning of your speakers whatever their physical position is. The ease of use and possibility of trying and storing many configuration is another advantage

There are standards in Digital audio. Differences are interface type, sample rate and bit depth. Mostly used interfaces are Spdif coax or optical ( that you can find on CD for example ) and AES EBU that is widely used on pro gear.

If you plan to plug digital directly your CD in a digital crossover, first you need a CD and a crossover with same digital interface, that can be SPDIF coax (available on many CD players) or AES/EBU available on some more expensive units. CD being 16bits 44,1kHz you will have no problem finding a digital crossover accepting that since most of the current units can accept even higher sample rates and bit depth up to 24 bits 96 kHz for some units ( Sony, BSS 366 ... ) and will sync to lower values of course.

Volume control is the problem you will have to face, in my opinion a good choice is to have a multichannel volume control after the output of your digital Crossover ( stereo two way would mean a quad volume control, stereo three way would mean a six channel etc... ) You can for example use a multichannel volume control from Dact http://www.dact.com

Hope that helps.

Pierre-Henri

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