The 1058 was another one of Neve’s first germanium microphone preamp/equalizer designs.  It has some of the same basic circuitry as the 1057, with high and low fixed-frequency cut/boosts and a switchable mids.  What makes these unique is that they have no input transformers and the output transformers are Marinairs, which were designed for later modules like the 1073.  This weirdness gives them a completely different sonic character than the usual 1058 (which sound similar to the 1057). Due to their gritty, dark coloration and unusual midrange presence, they are perfect for bass and guitar.  Beinhorn, again, used these exclusively on the bass and guitars for Soundgarden’s “Superunknown” album.  There were several faceplate variations – these are the “Neve grey” versions.

Low EQ:  Shelf.  100Hz?
Mid EQ:  1.75/2.5/3.5/5/7k
Hi EQ:  Shelf 8k?

SECRET SAUCE

GUITARS:  These make guitars grind.  Note the weirdo mid frequencies. Try ‘em all.
BASS:  Growl and punch.  Dime the low and the 1.75k.  Watch your levels.
VOCAL:  Attitude and grain, and a really cool parallel option.
KEYS:  These make analog synths SING.

TECHSHIZZ

Vintage Neve Modules.
Tubes:  No
Transformers:  Yes
Character:  Forward, Brash, Grain, Wool