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In the Forum: Horn-Loaded Speakers
In the Thread: Yamamura's 6 ways
Post Subject: 120db/oct without phase shiftPosted by cv on: 8/9/2013
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I bet Yamamura is using non-causal filtering... this is all running off a music server, so could process everything offline.
This makes it possible to do forward-backward filtering - you run the filtered signal "backwards" through the original filter (ie reverse the FIR coefficients) and get zero phase shift....and doubled up amplitude response...
Scale everything appropriately to make best use of 24bit dac range (easily done offline), add some proper dithering, and Romy's objections to digital filtering might well disappear...
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