How cheap? Discontinued AT-LP120 or new X version AT-LP120X? Does it need a new stylus?
What’s the difference between a TS cable and TRS cable?
The JBL or Nobsound should work.
More options:
Low cost Level Controller.
Monitor controllers with pro audio connections:
Or a Stereo Preamp with RCA inputs and output.
Or use a mixer.
What did you have the HS5 connected to before you acquired the turntable?
Or don't connect the turntable to the interface, bypass the interface.
Turntable > monitor controller, mixer or stereo preamp and all give you unified volume control > HS5
Nobsound Little Bear MC2 Balanced/Single-Ended Passive Preamp XLR/RCA Volume Controller for Active Monitor Speakers has both RCA and XLR inputs and outputs.
DYNASTY PROAUDIO PMC-2 Premium Passive 2 x 2 Studio Monitor Volume Controller has XLR, TRS, RCA, 3.5mm inputs and XLR, TRS, 3.5mm outputs.
Artesia EZA-MC2 Passive Stereo Monitor Controller has TRS, RCA and 3.5mm inputs and XLR, TRS and 3.5mm outputs.
Is there an alternative to Little Bear MC2? It has RCA and XLR input and output with a volume knob on the front, with the source switch button. Schitt Jotunheim and Focusrite interfaces are optimal, but way out of my budget.
Instead of digitizing the analog turntable audio signal try bypassing the digital interface and computer and connecting the turntable to the studio monitors with a level controller, a monitor controller, mixer or stereo preamp.
Monitor controllers to connect both the turntable and the interface so you can switch between them:
Stereo Preamp with RCA inputs and output.
Don't expect vinyl to sound as good as digital, it's just different with it's own sound and quirks.
Wet clean new and used records.
Turntable > Nobsound MC2 has both RCA and XLR inputs and outputs plus unified volume control > studio monitors.
Or Schiit Sys plus a pair of RCA to TRS cables or adapters.
What have you had the Kali connected to?
Turntable > phono preamp > level controller, monitor controller, mixer or stereo preamp > studio monitors.
Phono preamps:
Volume control, 2 input switch and phono preamp:
RCA volume control:
Volume control and switching with multiple connection formats:
Level Controller if you won't be using anything else besides the turntable with the studio monitors.
Schiit Sys has 2 RCA inputs switch with RCA output and volume control.
Nobsound MC2 has both RCA and XLR input and outputs if in addition to the turntable you want to also connect to an XLR audio source.
None of them.
Connect both the turntable and the Focusrite to a stereo preamp, a mixer or a monitor controller for unified volume control and to switch between the turntable and Focusrite or mix both together with the mixer.
Nobsound Little Bear MC2 Balanced/Single-Ended Passive Preamp XLR/RCA Volume Controller for Active Monitor Speakers has both RCA and XLR inputs and outputs.
DYNASTY PROAUDIO PMC-2 Premium Passive 2 x 2 Studio Monitor Volume Controller has XLR, TRS, RCA, 3.5mm inputs and XLR, TRS, 3.5mm outputs.
Artesia EZA-MC2 Passive Stereo Monitor Controller has TRS, RCA and 3.5mm inputs and XLR, TRS and 3.5mm outputs.
Or other options from Mackie or Behringer or other brands.
Nobsound MC2 to switch between turntable and interface has both RCA and XLR inputs and outputs.
Turntable and audio interface > stereo preamp, mixer or monitor controller > studio monitors.
Basic stereo preamp with both RCA and XLR inputs and outputs with volume control.