> Does this mean that A-106-6, A-122 and A-109 sound ther same but
> have diffent feature sets
>
> Thanks,
> Jacob

Yes. The A-122 and A-109 sound the same (but the A-109 in addition offers
loudness and pan control). The 24dB low pass output of the A-106-6 (4L) is
identically to the A-122/A-109 filter.

Best wishes
Dieter Doepfer