symmetrisk gain clone

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is it a BPA200 with inverting amplifiers?
Where are all the other components?
What values are R1, R2, R3 & R4?
How does the DC offset vary with temperature?
What happens to the amps when DC offset is not zero.

R1,R2,R3 & R4 i guess will be 10k
R9,R10,R11, & R12 is 221
R5,R6,R7 & R8 is 0.1

i plan to use opa541 chips, and i dont have a clue what will happen when det offset is not zero ..
 
R1,R2,R3 & R4 i guess will be 10k
you guess wrong.
If R1 =10k and R12=221r then gain is 221/10000 =0.0221 ~-33dB
Since you have a bridged load, the effective gain at the load is -27dB.

Swap these around and the gain becomes 10000/221 =45.2 ~+33dB and across the load +39dB. This is very high.
Swapping the resistor values causes an input impedance problem. The XLR sees an Rin=110R. What can drive 110r?
 
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