You tried these?
Coefficient Calculator For Digital Biquad Filters - COEFFICIENT-CALC - TI Software Folder
or
Biquad calculator v2 | EarLevel Engineering
fs = 44.1KHz,
fo =80Hz,
Peak gain =6db,
Q= 0.7071,
=>
a0 = 1.007957238938289
a1 = -1.9838808895496516
a2 = 0.9760525264901593
b1 = -1.9838808895496516
b2 = 0.9840097654284482
//
Coefficient Calculator For Digital Biquad Filters - COEFFICIENT-CALC - TI Software Folder
or
Biquad calculator v2 | EarLevel Engineering
fs = 44.1KHz,
fo =80Hz,
Peak gain =6db,
Q= 0.7071,
=>
a0 = 1.007957238938289
a1 = -1.9838808895496516
a2 = 0.9760525264901593
b1 = -1.9838808895496516
b2 = 0.9840097654284482
//
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