Vox AC15CH head attenuator details

[dsones]

Considering a Vox AC15CH head.  Does anyone know how the built in attenuator works?  I read the Vox description but it is very vague.  I saw a picture of the inside of the amp and it looks like there are just three cement resistors.  Is the description just for sales?  Thanks.

[kagliostro]

https://assets.yoreparo.com/attachments/aeFpEBIg0NXGanzPVC3HTWqTQX0nYwLgg7VoQR48.pdf

Page 9 of the pdf

Franco

[dsones]

Thanks that helps even though I don't fully understand the schematic.  So it looks like there is much more going on for attenuation than just resistors.  I have a weber minimass and bugera attenuator that work but color the tone to much.  I'm hoping the voc ac15ch head attenuates without changing the tone so much.  I've seen a couple you tube videos that touch on the attenuator sound and it seems the sound/tone stays the same regardless of the attenuation.  I don't have a local music store that carries the head.
Thanks again

[AlNewman]

Looks like it's just resistors and switching.  It's running imaginary speakers in parallel/series with the existing speaker to create a similar load to the power section.  Likely the loss of tone at certain frequencies is due to the speaker not being pushed as hard.

Rob Robinette has a similar mod on his website.  I think some of the more expensive attenuators are limited in part by inductance, which would better recreate the response of an actual speaker.

[dsones]

Thanks