Grado Labs
Past production
Columns: 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