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OPA1671: OPA1671 drive a speaker

Part Number: OPA1671
Other Parts Discussed in Thread: LME49721, LM4818

Tool/software:

Hi!

I designed a circuit to drive a speaker(32Ω) using the OPA1671. The simulation result looks good, with a 150mV input signal and output about 1.8V. However, in actual testing, the output can only reach around 800mV (using a variable resistor to adjust the amplification factor with RF). But if I change the speaker to a 1k ohm load, the output can reach around 1.8V . Could this be due to the speaker impedance being too low?

best regards

DAVID