The Goodmans 18" Audiom 91 Bass Speaker - 50W and 100W power handling

In late 1964 / early 1965, Vox turned to Goodmans again for a speaker for its Foundation Bass speaker cabinets, taking up the new Audiom 91 in place of the Celestion T1074 and T1109.

With its heavy-duty ceramic magnet, the Audiom 91 is a fine speaker. It no doubt proved cost effective too, unlike its predecessor, the Audiom 90, which cost a small fortune in the early sixties. Large alnico speakers were always more expensive than ceramic.

There were two versions of the Audiom 91: 50W, 15-16 ohms (black label) - this came first (in 1964). Then 100W power handling, 8 ohms (blue label). The 50W version was the version normally used in the Foundation Bass speaker cabinets accompanying Vox AC50s.

Click as ever for larger images. In 1964, the Audiom 91 cost £27 10 shillings. This was the speaker's first appearance in a pricelist. In 1963 it was still the Audiom 90.

Above, an early Goodmans flyer for the 50 watt, 15ohm driver. There was a "Standard" version for bass guitar and public address applications, and a "Bass" for organs and cinemas.

The fundamental frequency of the "Bass" version was 30c/s and of the "Standard" version 55c/s.

Black label - 15/16 ohms (normally) - 50W

Used singly in Foundation bass cabs accompanying AC50s, and in pairs of cabs accompanying AC100s. If two cabs were plugged into an AC100, the amp's impedance would be set at 8ohms. This is the speaker most commonly used by JMI.

Blue label - 8 ohms (normally) - 100W

With power handling of 100W, these could be used singly with AC50s or AC100s. The die-cast frames are substantial.

8ohm Audiom 91 in a Foundation Bass cab. Probably designed to accompany an AC50

A Goodmans unit from 1967 with a new "...Manufactured for Jennings Musical Industries" label. Stocks of these passed to Vox Sound Equipment Ltd, the company that sprang from the ashes of JMI.