The HA-81A EQ Elite is a channel strip that combines an all discrete, Class A 73-style mic preamp with an extremely versatile and musical console style equalizer - arguably the trick for obtaining instant classic sound for all recording engineers.
The MPDI-4 is as musical as it is powerful and flexible, switchable -20 dB input pad and -10 dB output pad.
A variable-frequency low-cut filter and unique low and high detail equalization controls, a 20dB pad, polarity invert, +48V phantom power, a front panel instrument input, VU metering, and peak indicator.
Features, Class-A 8-channel Mic Preamps, Custom Rupert Neve Transformers, 24-bit/192kHz converters, Full Dante Integration, and Redundant Power Supplies, zero latency.
The Electrodyne 2501 is a dual mono pair of two stage discrete transistor, transformer coupled preamp with active DI, using classic early '70s design technology.