Past Production
The Joseph Grado Signature Products HP-1000 series headphones were limited to 1000 units produced. The HP-1000 series consisted of the HP-1 (with phase/polarity switches), HP-2, and HP-3. They came in two varieties of cable. The Joseph Grado Signature Ultra-Wide Bandwidth Reference Cable and the Signature Laboratory Standard. Please note that the older, non "improved" models in Grado's lineup (such as SR-60 and RS1) are not contained within this table because the improvements were not significant and they directly replaced the older models in the lineup.
Below is a table of headphones no longer offered by the manufacturer:
| 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 |
Read more about this topic: Grado Labs
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