Yep, just a simple cap will do the job for you1st order roll-off, not good for much.
Get the Loki pebblesr2, you’ll love it like others do, and you’ll have other uses for it as well.
Like setting it flat and having a very good discrete buffer should you ever need one.
Frequency Response: 20Hz-20Khz, -0.1db, 2Hz-850KHz, -3dB, 75ohm output impedance and the other specs as good as the best pre’s around.
You can do contouring as well if you have bottom end standing wave at certain frequencies in your room.
There is also a bypass switch so you can instantly hear while playing what your setting effects are doing for you.
Cheers George