BTW, another equalization option is a very good sounding 6SN7 based line stage with useful equalization, especially in the bass region and fun spatial controls both of which can be bypassed. Black Ice Audio Fusion F360. They also offer these circuits in a stand alone device that can be inserted in your tape loop, Foz SS-X.
Just be aware that such things are not approved by the audio police.
Just be aware that such things are not approved by the audio police.