Hi all,
I have a few 90s Kenwood active crossovers meant for car use and they have an interesting IC(s) right at the input to cancel out common mode noise.
They are given different names in different models and googling the part numbers doesn’t turn anything up.
They can be found in the service manuals for these two:
https://ia902301.us.archive.org/20/items/manual_KEC300_SM_KENWOOD_EN/KEC300_SM_KENWOOD_EN.pdf
Page 9, given as IC1 “lNH-02080”
And for this model
https://ia902308.us.archive.org/32/items/manual_KEC301_SM_KENWOOD_EN/KEC301_SM_KENWOOD_EN.pdf
Page 6, given as IC2 “NH384”
Anyone heard of these, why these rather than the other types of op amp (upc4570) used in these crossovers?
I have a few 90s Kenwood active crossovers meant for car use and they have an interesting IC(s) right at the input to cancel out common mode noise.
They are given different names in different models and googling the part numbers doesn’t turn anything up.
They can be found in the service manuals for these two:
https://ia902301.us.archive.org/20/items/manual_KEC300_SM_KENWOOD_EN/KEC300_SM_KENWOOD_EN.pdf
Page 9, given as IC1 “lNH-02080”
And for this model
https://ia902308.us.archive.org/32/items/manual_KEC301_SM_KENWOOD_EN/KEC301_SM_KENWOOD_EN.pdf
Page 6, given as IC2 “NH384”
Anyone heard of these, why these rather than the other types of op amp (upc4570) used in these crossovers?