I have always had problems with the 81. Too bassy and without enough musical mid frequences for my taste, so I always switched it with an 85 at the bridge position, which is much more mid focused and "recording friendly". The blackout ahb1 is designed with the aid of dino cazares, the same that for the first 7 string emg pickup asked for a 7 strings version of the 85 (the 707), instead of an 81. The result is that the ahb 1 is similiar to an emg85 in terms of tone, but probably has a bit more output and a little bit of low-mid muddiness added, anyway it's a very good pickup and in my opinin a great replacement for an emg81.