Frequency Response of a Marshall 4x12 Cabinet

Following is a graph showing the frequency response of a late 70's slant Marshall 4x12 cabinet (checkerboard grille cloth, plastic handles) loaded with the original Celestion G12M25 "cream-back" speakers, miked with a Shure SM57 on the lower left hand speaker in the center of the cone, at a 45 degree angle towards the side of the cone.  Measurements were taken with a Hewlett-Packard 3580A spectrum analyzer.

Marshall4x12response 2

Copyright © 1999,  Randall Aiken.  May not be reproduced in any form without written approval from Aiken Amplification.

Revised 02/18/14