I can't tell if you're doing anything wrong. Maybe it works for you.
There were different problems that struck me.
- Frequencies not adjustable
- LPF and HPF did not match
- Bass present on the recording was attenuated too much
- Volume levels of satellites and subwoofer differed across the volume range
- Subwoofer had fixed volume
It can be due to immature firmware or different firmware versions. Wouldn't be the first time that a firmware is updated by these companies without it being recognizable or the update being published.
It was just a quick test of each amp in an existing 2.1 system. Actually, this should have worked immediately and without much coordination, as tested with many AVRs before.
I have never experienced anything like this in 30 years, neither with umpteen AVR/AVPre nor with active or passive 2.1 systems.
At this point, all buyers would be much better off with a separable preamplifier/power amp connection and a volume-controlled full-range output for the subwoofer.
This allows active crossovers, DSPs and equalizers to be looped in and active subwoofers to be operated. And well-functioning active 2.1 crossovers have been available in all quality classes from the automotive sector for umpteen years. These often only cost an apple and an egg and run on any 12v power supply.
This is so true. I just tried two cheap desktop USB amps (
SMSL A100 +
Fosi DA2120A) and both of them have the subwoofer volume issues. It's not a good solution if you have to separately adjust the subwoofer volume to match the speaker volume. Thank you for pointing this out Roland! (Now I can't be satisfied with those kinds of products anymore, lol.)
I wonder if it's the same for all cheap amps - and also if the more expensive ones have the same issue. I'm probably going to try the much more expensive
NAD D3045 soon to see if the subwoofer volume is synced with the speaker volume - or if it has the same issue.
Edit #1: I also just tested the
SMSL A300 and it has the same issue. After a certain volume level the subwoofer becomes too low and the speakers take over. On low volume however, the subwoofer is very prominent, even too much. I will be trying out the
AIYIMA D03 and the
LOXJIE A30 in a couple of days as well, but it wouldn't surprise me if the results are the same there.
Edit #2: To be fair the subwoofer volume
does adjust on the lower volume levels for all of my tested amps. However, as soon as one starts entering the ~30% volume and more, the subwoofer volume just doesn't go any higher, resulting in speakers that are playing in a way higher volume than the subwoofer. There is definitely some kind of async going on here.