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What are Allpass filters, what are they used for & etc.

3K views 16 replies 7 participants last post by  Bass Face 
how can one tell if their system has these employed? do you need to test & graph phase v.s. frequency plot for each speaker?
If you have a helix dsp with input analyser you can see these by playing left/right channels alone and then summing them and seeing if they sum with 6db or if you have areas with less summation… where there is less summation that’s where your all pass is 👍🏼
 
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