Very nice shape
from Mac text:The McIntosh MQ 104 is a dedicated equalizer to optimize low-frequency response of certain McIntosh loudspeaker systems, as well as programmable four-band per channel third or full octave equalizer. It came out around 1980. It is intended to be set-up with instruments, and then hidden away. The cover minimizes der fingerpoken.
Each channel has four selectable levels of low-frequency boost, or sets flat. These only boost below 100 cycles and boost strongly down to 20 cycles. A 14-cycle infrasonic filter rolls-off response below 20 cycles
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