FREQUENCY RESPONSE
RETRO IRON Engaged on Main Mix
±0.1dB (10Hz to 80kHz)
HARD-WIRE BYPASS
Relay Switched - No Loading Effects
THD + N
0dBu into 600Ω
< 0.016% @ 1kHz (2nd & 3rd)
+24dBu into 600Ω
< 0.033% @ 1kHz
NOISE
RETRO IRON On, EQ Off
< -92dBu (20Hz to 20kHz unweighted)
MAXIMUM OUTPUT LEVEL
Carnhill Line Driver
+28dBu into 600Ω
Insertion Loss
1dB into 600Ω (Transformer Loading)
Output Gain
±0.5dB Load Dependant
Output Impedance
600Ω
DYNAMIC RANGE
120dB
CROSSTALK
< -82dB 10Hz to 10kHz, typ. -88dB @ 1kHz
TONE SHAPING EQ
Low Bump
+2dB wide bell @ 60Hz, Baxandall Type
High Lift
+2dB wide bell @ 20kHz, Baxandall Type
Gain Adjust Jumper Positions
+0.5, +1, +2 (default) or +3dB Options
The Heritage Card was designed and built with world class LM4562 operational amplifiers (EQ
stages) and a discrete Class-AB RETRO IRON output stage based upon the best US & UK designs
from the early 1970’s. Taking influence from two consoles that David Dearden modified and
serviced at Advision Studios in London during his arrival as in-house technician, these consoles
became part of the sound of recording for clients such as David Bowie, Emerson Lake & Palmer,
Shirley Bassey, Fleetwood Mac and many others. The H.E Card offers glue, 3-dimensional detail
enhancement and lower midrange growl - designed by Tom Waterman and fine tuned by ear to
reflect these classic tones.
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RETRO IRON HERITAGE CARD