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Measurements

Frequency responce. EQ turned off.

Frequency responce. EQ tyrned on, all bands turned off.

High pass filter preformance

 

Low pass filter performance

Low shelf filter performance

High shelf filter performance

 

Presence filter performance, normal Q

Presence filter performance, high Q
THD for line input
THD for DI input

Now the promised transformer shielding comparison.

Here's the noise floor of the unshielded transformer, EQ turned off

The noise floor of the unshielded transformer, EQ turned on
The noise floor of the shielded transformer, EQ turned off

The noise floor of the shielded transformer, EQ turned off

To sum up, we can gain up to 6 dB in 50 Hz induced hum using a magnetic shielding. It's possible to do even better if you remove the PSU from the enclosure completely.

Anyway, even without shielding it's possible to achieve original claimed specs for the 1084 units.

We hope this Guide was helpful to you. Enjoy your new mic preamp!