The issue with the Douk Audio HiFi Pure Class A Power Amplifier Home Stereo Single-ended Amp 15W×2
Is it doesn't have a sub out.
Douk Audio has a aliexpress store
https://doukaudio.aliexpress.com/store/813423?spm=a2g0o.detail.0.0.367bB1yHB1yHsZ
I'm not sure if the link will be visible but from my earlier post, the link could then be used to the manufacture's page.
And I stumbled into their Vaccum tube page, long story short, I am now wondering how these guys will sound with the DX3 pro +
Douk Audio Vacuum Tube Amplifier Bluetooth 5.0 Receiver Coaxial / Optical Audio Power Amp Headphone Amp USB Player 35W+35W
https://www.aliexpress.com/item/1005004978995104.html?spm=a2g0o.store_pc_groupList.8148356.3.30954ad5lzeZ7c&pdp_npi=4%40dis%21SGD%21SG%24%20244.14%21SG%24%20170.90%21%21%21173.73%21121.61%21%40211b88f116990860691782594e033c%2112000031220990975%21sh%21SG%21176238292%21
Douk Audio HiFi Valve Tube Amplifier Bluetooth 5.0 Stereo Receiver COAX/OPT Integrated Amp Audio Processor USB Music Player
https://www.aliexpress.com/item/1005002010547736.html?spm=a2g0o.store_pc_groupList.8148356.35.30954ad5sFovLx&pdp_npi=4%40dis%21SGD%21SG%24%20387.76%21SG%24%20271.43%21%21%21275.93%21193.15%21%40211b88f116990860691782594e033c%2112000029450265327%21sh%21SG%21176238292%21
Then there is the Dayton HTA200 and HTA100 for considerations too.
If the Douk Audio HiFi Pure Class A Power Amplifier Home Stereo Single-ended Amp 15W×2 are some of their offerings
Even this guy looks interesting:
Douk Audio HiFi Vacuum Tube Power Amplifier Bluetooth 5.0 Stereo Receiver USB DAC COAX/OPT Digital Audio Amp VU Meter 100W+100W
https://www.aliexpress.com/item/1005003166879691.html?spm=a2g0o.store_pc_groupList.8148356.17.560f7b0bqEkCMo&pdp_npi=4%40dis%21SGD%21SG%24%20176.74%21SG%24%20114.88%21%21%21125.77%2181.75%21%40211b88f116990871212544871e033c%2112000029300028563%21sh%21SG%21176238292%21
Sorry if I know so little that my enthusiasm for ChiFi and cheap amps might offend some folks here.