Hi all, I've been enjoying my 789 for a little while now and decided to do a few tests on my unit. One thing I found is a strange rise in crosstalk vs. frequency when the gain is set to its lowest position (1). Here's a screenshot of what I'm seeing:
For gains 2 and 3, crosstalk is practically identical to the soundcard's loopback as expected, but for gain 1, it rises steadily above ~100 Hz. Note that these tests were done
unloaded for the best possible results.
Here's my measurement setup:
- Lynx Studio E44 soundcard (balanced output/input) at 96 kHz, 24 bit
- THX AAA 789 (3.5mm SE output -> 3.5mm to RCA adapter -> RCA to XLR cables wired as per LynxTWO manual)
- Results are identical with the 1/4" SE output
- Volume set to maximum for all tests except for the test at gain 1 (volume set to ~4 o'clock to reach 6 dBV/2 Vrms)
- RightMark Audio Analyzer 6.4.5 software
Other than crosstalk, all other unloaded measurements (frequency response, noise, THD, IMD, etc.) match the soundcard's loopback at all gain settings.
@amirm /
@AndrewMason , can you see if you're able to replicate this? I find it interesting that this only happens at the lowest gain setting, and since I use that setting for normal listening I'm a tiny bit disappointed that it doesn't perform quite as well in this aspect, but of course with a single-ended headphone load this is probably inaudible. I don't have the connectors to build an XLR-4 to dual XLR-3 adapter right now, but it'd also be interesting to see if this rise in crosstalk at gain 1 also happens with the balanced output.