IVX
Major Contributor
actually, I believe it is possible to wipe out harmonics and noise with the passive BPF..
it is a tech as is supposed to be, 9039Q2M may give you all harmonics under -150db@1kHz@accurate implementation. The LPF is for complete geeks to wipe harmonics even under -160db.
Will it be available as a board or a device in a case?$50 LPF board.
I guess no but actually, APU's case is suitable.Will it be available as a board or a device in a case?
The scaler is convenient for dealing with the E1DA input impedance and correcting the roll off you might get when testing something capacitor preamp. For 1 kHz SINAD, may not matter since the 10V sensitivity mode is still really clean.Do I need both the APU and Scaler as well?
Well, for the AP, DAC / Dig.Gen and ADC do not run on the same clock, the clocks are completely independent. That did cause a lot of head scratching some time ago.The two advantages of an AP test set and even the QuantAsylum product are that they are in one box with less chance of these problems and that the ADC and DAC use a common clock, which can have some advantages sometimes.
Well, for the AP, DAC / Dig.Gen and ADC do not run on the same clock, the clocks are completely independent. That did cause a lot of head scratching some time ago.
I am about to order the Cosmos ADCiso. This will replace my EMU 0404 USB which died after serving my measurement needs for 16 years. Considered repairing it if possible but decided not to bother.
I used the 0404 USB mainly for DIY speaker measurements, DAC/amp testing, and occasional stereo music recording.
I wanted to check with advanced users here before hitting the order button. Do I need both the APU and Scaler as well? For acoustic measurements I need a mic pre (w/ two channels for occasional stereo recording). But I don't think I need extremely low noise floor or low-level HD measurement ability for speaker DIY (let alone two APUs for stereo recording). The EMU (which was the SOTA at the time) was more than sufficient. Not sure I will need the APU's notch filter, either. So, I think I can pass the APU and get a more practical two-channel mic preamp.
Now, about the Scaler. I think this is worth owning because I need an input buffer---and gain settings should add flexibility---to measure some audio gear with relatively high output impedance.
Am I on the right track? Is there anything I miss here?
Yep, the ADC for the analog analyzer is completely independent from any sample rate setting for digital outputs (internal if SPDIF/AES3/I2S etc, external for USB).Is that right, wow. I just assumed they would have a master clock, divided down to whatever D/A, A/D settings you selected. So you can have different clocks for the D/A and A/D?
I can only say that the high rates (624kHz and multiples) are not synced to 48kHz and multiples, even though the integer factor (13) would seem to suggest that.Is it that the effective clock sampling rates for the converters are independent or that there are separate physical clocks?