These early At mics were conceived by some ex Electrovoice engineers and salespeople.
Very well targeted and designed.
Regarding the AT813, AT831A and the ATM31 (same mic, different paint) had nearly identical on axis (cardioid) and especially off axis response to the U87. The U87 tended to get very omni at high frequencies so it sounded crisper off axis which is where some of the sound comes from in many cases, lending to it’s unique sound.
I sold many of them over the years and most people were very happy with the result. Remember this was long before cheap Chinese condensers. We also marketed a private label variation which was called a “C87”.
One reply on “AT813_U87_Ad_0380”
These early At mics were conceived by some ex Electrovoice engineers and salespeople.
Very well targeted and designed.
Regarding the AT813, AT831A and the ATM31 (same mic, different paint) had nearly identical on axis (cardioid) and especially off axis response to the U87. The U87 tended to get very omni at high frequencies so it sounded crisper off axis which is where some of the sound comes from in many cases, lending to it’s unique sound.
I sold many of them over the years and most people were very happy with the result. Remember this was long before cheap Chinese condensers. We also marketed a private label variation which was called a “C87”.