The RP-640D is the largest model in the Reference Premiere Designer On-Wall range, designed for rooms where floor space is at a premium but full-range performance is still required. It works as a left, centre, right or surround speaker.
A central LTS titanium Tractrix tweeter is flanked by two active Cerametallic woofers and four passive radiators, extending the low end to around 55 Hz from a slim cabinet. A tempered-glass base and keyhole mounts allow shelf or wall placement. Sold each, finished in black.
| Type | On-wall speaker |
| Low frequency extension | Down to 55 Hz |
| Sensitivity | 94 dB |
| Drivers | 1 inch LTS Tractrix tweeter, two active Cerametallic woofers, four passive radiators |
| Placement | Left, centre, right or surround |
| Mounting | Tempered-glass base and keyhole wall mount |
| Finish | Matte black |
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