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In Reply to: Topping D90 filters? posted by Rod M on July 14, 2020 at 19:34:31:
Mode 1 and Mode 3 are both sharp roll-off, but they are not brick wall. They only differ in delay, so they should be indistinguishable.
Mode 2 and Mode 4 are both slow roll-off. Again, they only differ in delay, so they should be indistinguishable.
The difference in response between Mode 1/3 "sharp" and Mode 2/4 "slow" is relatively modest, so some people will hear a small difference and some people won't.
Mode 5 is called "super slow", and that's an understatement. It's nearly a straight pass-through. That will give you tons of aliasing and should sound different.
Mode 6 is "low dispersion". I'm not sure what the purpose of it is, AKM's documentation doesn't really say. But the frequency domain response is in between the "slow" and "super-slow" options.
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Follow Ups
- They are using the filters built into the AKM DAC - Dave_K 07/15/2007:11:00 07/15/20 (2)
- "low dispersion" - DrChaos 09:52:53 07/16/20 (1)
- They're all FIR filters - Dave_K 07:22:16 07/17/20 (0)
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