for 10k ohm, do you think it will affect output capacitor coupled source with 200ohm output impedance? it seems quite some dacs are spec like that, and that for passive preamps the 10k ohm input impedance seems quite common?
well, that makes it not much universal device.
2k for XLR, 10k for RCA.https://www.audiosciencereview.com/...reamplifier-extender.17635/page-3#post-572778
seems like 2kohm, so from common internet hifi principles those old high output impedance dacs would get FR strongly affected by that
Frequency response will not affected by high output impedance devices unless it's capacitor coupled or transformer coupled.