Corsair HS55 Stereo impedance: 32 or 32,000 ohms? The same line is on three product pages
Yes. The SHIO drives the HS55 Stereo to about 120.0 dB, 10.0 dB above a 110 dB peak. A separate headphone amp is not what this pair is missing.
The Truthear SHIO has enough voltage for the Corsair HS55 Stereo. Turn it up for the recording you are playing, not to make up a shortfall that is not there.
The HS55 Stereo is 32 Ω. Reaching a 110 dB peak — a loud moment in film or classical, not a casual average — takes about 0.63 V from the source. The SHIO gets to 120.0 dB on this load.
If the tone sounds wrong, look at output impedance before you look at another amplifier. An amp upgrade here buys headroom you will not use and, on a sensitive headphone, sometimes a higher noise floor. Leave the volume where the music is comfortable. The peaks in a normal file are already inside what this output can swing.