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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 ampliers (EQ
stages) and a discrete Class-AB RETRO IRON output stage based upon the best US & UK designs
from the early 1970’s. Taking inuence from two consoles that David Dearden modied 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 ne tuned by ear to
reect these classic tones.
58
RETRO IRON HERITAGE CARD
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