Universal Audio Ox Box

This is the main box I use to record/listen to my Plexi51. I don't use the attenuator feature, only the cabinet emulation, effects (sometimes), and then the direct out into my audio interface.

From there I use the headphone out of the Apollo, as well as the occasional plugins to recreate something like Olympic Studios in the late 60s/early 70.

I mainly use the 4×12 GB 25 THICK cabinet, which according to my research is supposed to be a capture of “Late 60s Marshall w/ vintage Celestion 25W Greenbacks” in a 4×12 cabinet. I assume this means G12H speakers, which are what Page is said to have used. UA describes them thusly:

This vintage closed-back cabinet with four 12-inch speakers is the sound of rock guitar. With original “green” 25-watt speakers, it breaks up on high notes around F#, G#, and C when SPEAKER DRIVE is pushed. This specific vintage cabinet has an extended low midrange and bass response.

I'll also occasionally use their 4×12 GB 25 PUNCH:

This vintage closed-back cabinet with four 12-inch speakers is the sound of rock guitar. With original “green” 25-watt speakers, it breaks up on high notes around F#, G#, and C when SPEAKER DRIVE is pushed. This specific vintage cabinet has a moderately scooped midrange delivering a tighter sound.

Then the mics I use with it are their RIB 160 (Beyerdynamic M160) and DYN 57 (Shure SM57), panned far left and right respectively. I know from pictures that Zeppelin tended to use SM57s, or their 70s precursor, the Shure 545 Unidyne III. The room/ambience mic is a stereo pair of (TODO, I forget offhand). They are mixed rather low, and are just there to give some natural room sound, in addition to the close mic'd sound of the M160 and SM57.