--- In
AN1x-list@yahoogroups.com, "db00451" <db0451@...> wrote:
> Of course, before we investigate the electronics of the reconstruction LPF, I could probably run a sine sweep or such to get an idea of its inherent frequency response without physical inspection. I'll try that.
Done.
I have no idea what Don Solaris meant by claiming an attenuation of a whopping 20 dB at 12 kHz even with all modelled filters, etc. off.
My tests show the AN1x has a perfectly sane frequency response with an analogue reconstruction LPF whose -3 dB point is at 16 kHz. That figure matches my findings from studying previous synths by Yamaha.
In other words, there's nothing in the AN1x causing any intrinsic attenuation in the normal audible range with all modelled filters off.
I can only assume Don made some mistake - unless it's somehow possible he was talking about something else in very confusing terms, but then again, there's nothing in the AN1x that could do that.
Anyway, crisis averted! The AN1x is sanely designed. That's good news.
In case someone wonders how bad my hearing is not to notice that the reconstruction LPF was fine before... I presume that the last time I tested the AN1x after reading that claim, I used awful headphones or something, muffling the sound and thus making me think it could be true. On proper speakers, it sounds A-OK, and my testing proved that.
If anyone might be interested, I'm drafting a more detailed write-up of this in the works, including my methodology and whatnot, so I might get around to posting that in the relevant thread on GearSlutz.