Single 21″, Low Q band-pass subwoofer system that adds extension and weight for applications where you want to feel, as well as hear, very high definition audio Working down to 23Hz with an efficiency for two boxes of 102dB, it shares the same footprint as the other VHD subwoofers in a compact lightweight easily transported package. Alongside the VHD2.16, it forms part of a remarkable five way active system.
| Max SPL Long-term | 135dB (2x VHD1.21) |
| Max SPL Peak | 138dB (2x VHD1.21) |
| -3dB Response | 29Hz to 60Hz |
| -10dB Response | 23Hz to 60Hz |
| Impedance | 8Ω |
| Crossover Point | 60Hz |
| Acoustic Design | Large chamber low Q band pass |
| Low Frequency Amplifier Requirement | 800W /1x VHD1.21 (VHD 3200 amp.) |
| Woofer Size / Voice Coil Diameter / Design | 21″ / 4″ Inside Outside |
| Diaphragm Material | Epoxy Reinforced Cellulose |
| Magnet Type | Neodymium |
| Speaker Input | AP4 male |
| Speaker Output | AP4 female |
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