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Can Pro 9028 IIR Filters be Disabled?

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Magz

Magz

Member
Joined 2009
#1
Hello, my 9028 Pro sounds great with DSD512, IIR set to 70K and LL1676 transformer (1:1) summing the outputs to an 01A tube.
Question: since the LL1676 already low pass filters the output (53KHz corner frequency), is it possible to disable the internal IIR filter in the DAC chip? I have a 4-position rotary switch on the DAC to select the IIR and 70K clearly sounds better than a lower setting, so maybe it would sound even better without any IIR filtering. Just a thought...
 
#2
Quick answer: no, you can't turn the IIR filters off.

But most likely with the 70K setting the transformers are doing at least a good share of the HF elimination. See attachment.


73DF47B4-5CBA-49F4-A006-0E1A17036403_4_5005_c.jpeg
 
#3
Thanks, that's what I figured from reading the datasheet, but thought that maybe there was a workaround. I found it interesting that the FIR filters are bypassed in DSD and that DSD has its own IIR filters as well.
 
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