Thanks for this great script, it's really useful tool. I wondered if I could get some input on a measurement anomaly I've found with my setup?
I've got a Technics SL-7 and a couple of carts: a Technics EPC-310MC and an Ortofon OM-5 body with OM-30 stylus. I have an RME ADI-2/4 Pro SE, so I run the OM directly into the ADI-2/4's ADC using the RIAA mode. I have a Reisong 1:20 MC SUT which I use with the 310MC. I'm using the CBS STR-100 Mk3 disc.
The ADI-2/4 has a DSP feature called RIAA Mono Bass. According to the manual "For this purpose, only the bass frequencies below 150 Hz are summed to mono." When enabling the RIAA Mono Bass feature I am seeing a bass roll off in the script measurements starting at 300Hz. I don't see this roll off when I disable the Mono Bass feature.
Here are some plots to show what I'm seeing. I've included a measurement taken with a NAD phono pre that uses the ADI-2/4's ADC only with no RIAA functionality enabled.
Is it possible that the bass roll off when RIAA Mono Bass is enabled is a measurement artefact? Or is it a problem with the ADI-2/4's DSP? Or have I just messed up my measurements?
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Any help greatly appreciated.
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