Table:
text: Grado Labs
Past production
Past production
Headphone_Model Headphone_Class Sensitivity_dB Impedance_Ohms Driver_matched_dB Construction Earpads Termination Succeeded_by
SR40 Unknown 100 32 Unknown Plastic Foam 1/8 (3.5 mm) plug with 1/4 adaptor iGrado
SR325 Prestige 98 32 0.05 Aluminum Alloy Bowls 1/4 (6.5 mm) plug SR325i
HP1000 Joseph Grado Signature Unknown 40 Unknown Aluminum Alloy Flats 1/4 (6.5 mm) plug No Successor
SR100 Prestige Unknown 32 Unknown Plastic Flats 1/4 (6.5 mm) plug SR125
SR200 Prestige Unknown 32 Unknown Plastic Flats 1/4 (6.5 mm) plug SR225
SR300 Prestige Unknown 32 Unknown Plastic Flats 1/4 (6.5 mm) plug SR325

Question: What is the headphone model with a plastic construction and a prestige headphone class under the previous Grado Labs production?

Question: Which ear pads from the previous production of Grado Labs does the headphone with plastic construction and successor to igrado have?

Question: What are the ear pads in the previous production of Grado Labs headphones with a plastic construction, an unknown sensitivity, and was superseded by sr325?

Question: What is the headphone model that was followed by the sr325 in Grado Labs earlier production?