KV2 Audio » Products » VHD » VHD4.21
VHD4.21 Active Passive Bass Module
What is Power without Control. In developing one of the most powerful subwoofer solutions in the world today, our already successful VHD2.21 2x21" subwoofer has evolved to incorporate a revolutionary new Subwoofer Amplifier design, unique to KV2 and featuring Ultra High Current delivery, Immense Power, Exceptional Control, coupled with a class leading 'Green Efficiency' low consumption power supply. Housing two newly developed large format 21" Woofers the VHD4.21 Active can power an additional Passive VHD4.21 and deliver up to 14,000 Watts of peak power whilst being plugged in to a standard 16A wall socket. The VHD 4.21 is a truly Amazing product and demonstrates the Pinnacle of KV2's Pioneering Subwoofer technologies.
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Applications
The Ultimate seismic Subwoofer to add to any KV2 Audio or third party manufacturers system.
- Large scale live music and playback performance
- Dance Clubs and Nightclubs where Music comes first
- Hire and Production
- Large Concert venues
- Cinema
- Fixed installation
- Easily incorporated into multiple system projects with VHD, SL, ES and ESR
Product code
KVV 987 333 - VHD4.21 ACTIVE
KVV 987 336 - VHD4.21 PASSIVE
Features
The VHD4.21 Active Subwoofer Module consists of two purpose designed 'Low Loss-Band Pass' enclosures, one Active and one Passive, with each enclosure containing two specific custom designed large format 21" woofers.
The Low Q design has been applied to attain the optimum Loudspeaker loading, enabling a high sensitivity of 109dB 1w/1m. The design of our unique and innovative new power management system enables the Active Power Amplifier to deliver peak output levels of 14kW, whilst operating at a modest constant consumption of 3.6 kW from a 16A circuit.
An impressive maximum 320V supplied (limited) peak to peak at 100A from the VHD4.21 Active Module represents a bullet- proof technology that has been fully developed and refined over 12 years of active operation in real life applications, providing maximum control over movement of the large mass of the speaker.
Applications
The Ultimate seismic Subwoofer to add to any KV2 Audio or third party manufacturers system.
- Large scale live music and playback performance
- Dance Clubs and Nightclubs where Music comes first
- Hire and Production
- Large Concert venues
- Cinema
- Fixed installation
- Easily incorporated into multiple system projects with VHD, SL, ES and ESR
Product code
KVV 987 333 - VHD4.21 ACTIVE
KVV 987 336 - VHD4.21 PASSIVE
System Acoustic Performance
| Max SPL Long-term | 147dB |
| Max SPL Peak | 150dB |
| -3dB Response | 34Hz - 180Hz |
| -10dB Response | 28Hz - 240Hz |
| Crossover Point | 60Hz to 120Hz |
Low Frequency Section
| Acoustic Design | Bandpass with low port losses |
| Woofer Size / Voice Coil Diameter / Design | 4x 21" / 5.3" |
| Diaphragm Material | Epoxy Reinforced Cellulose with Carbon Fiber and Double Surround |
| Magnet Type | Neodymium Advanced Ventilated |
Low Frequency Amplifier Specification
| Type | Direct power switching amplifier |
| Rated Continuous Power | 3500W |
| Short Term Power | 14000W |
| Distortion | <0.05% |
Signal Input
| Input Sensitivity | 1.55V RMS |
| Input Impedance | 20 kΩ |
Power Requirements
| Power Connector | Neutrik PowerCon® 32A |
| Operating Voltage | 180V - 260V @ 50Hz | 60Hz |
| Recommended Amperage | 16A |
Cabinet
| Cabinet Material | Baltic Birch |
| Handles | 12 |
| Color | Black or any RAL |
Physical Dimensions
| Height | 700mm (27.55") |
| Width | 1080mm (42.52") |
| Depth | 1200mm (47.24") |
| Weight (Active) | 175kg (386lbs) |
| Weight (Passive) | 155kg (342lbs) |
Product code
KVV 987 333 - VHD4.21 ACTIVE
KVV 987 336 - VHD4.21 PASSIVE
VHD2.21/4.21 Cover
VHD4.21 Amplifier transport and fabric cover 
VHD4.21/2.21 FlybarVHD2.21/4.21 Cover
Product code
KVV 987 352
Description
Cover for VHD2.21/4.21
VHD4.21 Amplifier transport and fabric cover
Product code
KVV 987 390
Description
Transport and Fabric Cover for VHD4.21 Amplifier
VHD4.21/2.21 Flybar
Product code
KVV 987 398
Description
Flybar for VHD4.21 or VHD2.21. See VHD4.21 user manual for more instructions.
