So, Steve Brothers(fobstl) and I recorded a show together recently with his demo 744t. I transferred the files to my G4 PB at the venue after the show and took the files home with me. When I analyzed the combined signal(all 4 channels) I noticed a peculiar spike at around 41,560Hz. It's totally inaudible(at least to my ears on my current playback system) and doesn't seem to affect the recording, but i think it's an issue that should be addressed. It's my hope that one of you who is already registered at SD support forum will copy this post to that board so that the SD tech guys can look into it. After Nick Gregory and Charles Fox's recent 722 AD chipset problem I decided that the AD problem might not exactly be isolated to their specific units or the 722's in general. I believe this could be an AD chipset problem as well, but am not 100% sure at all. Here is all the pertinent info.
Source: [SBD>XLR's] + [CMC64's>AM Hyperlite XLR's>V2(hpf@50Hz, -6dB/oct)>custom SD XLR-to-miniXLR's}] > 744t
Bit Depth: 24
Sample Rate: 88.2kHz
Transfer: 744t > IEE1394 > G4 Powerbook > IEE1394 > PC
Mastering: Wavelab 5.0
Here is a picture of the spike zoomed all the way out(full spectrum):
Here is a picture of the spike zoomed pretty far in:
Notice in the closup that the spike appears to be a "plateau" instead of spiking a single frequency. What does everybody think? Could somebody please post this over to the SD forum and see what they say? I'm still waiting on my 722 and can't register yet. Thanks in advance for any and all opinions and thoughts.
edit: grammar and such
edit 2: BTW, for those interested in this, i'm going to be gone the rest of the night and won't be able to report back until tomorrow.