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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 VHD4.21 is a truly Amazing product and demonstrates the Pinnacle of KV2's Pioneering Subwoofer technologies. There is also a flyable version available - VHD4.21R Active Passive Bass Module (KVV 987 480 / KVV 987 481) with additional fixings and requirements for the VHD4.21 Flybar (KVV 987 398). 

Watch the product video

Download Product’s Data Sheet

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

KVV 987 480 - VHD4.21R ACTIVE
KVV 987 481 - VHD4.21R PASSIVE 

 

Features

  • two purpose designed  'Low Loss-Band Pass' enclosures, one Active and one Passive, 
  • 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. 
  • 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
  • maximum 320V supplied (limited) peak to peak at 100A from the VHD4.21 Active Module 
  • a flyable version available - VHD4.21R Active Passive Bass Module (KVV 987 480 / KVV 987 481)
 

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

KVV 987 480 - VHD4.21R ACTIVE
KVV 987 481 - VHD4.21R PASSIVE 

 

System Acoustic Performance

Max SPL Long-term147dB
Max SPL Peak150dB
-3dB Response34Hz - 180Hz
-10dB Response28Hz - 240Hz
Crossover Point60Hz to 120Hz

Low Frequency Section

Acoustic DesignBandpass with low port losses
Woofer Size / Voice Coil Diameter / Design4x 21" / 5.3"
Diaphragm MaterialEpoxy Reinforced Cellulose with Carbon Fiber and Double Surround
Magnet TypeNeodymium Advanced Ventilated

Low Frequency Amplifier Specification

TypeDirect power switching amplifier
Rated Continuous Power3500W
Short Term Power14000W
Distortion<0.05%

Signal Input

Input Sensitivity1.55V RMS
Input Impedance20 kΩ

Power Requirements

Power ConnectorNeutrik PowerCon® 32A
Operating Voltage180V - 260V @ 50Hz | 60Hz
Recommended Amperage16A

Cabinet

Cabinet MaterialBaltic Birch
Handles12
ColorBlack (wear resistant polymer coating)

Physical Dimensions

Height700mm (27.55")
Width1080mm (42.52")
Depth1200mm (47.24")
Weight (Active)175kg (386lbs)
Weight (Passive)155kg (342lbs)
 

Product code

KVV 987 333 - VHD4.21 ACTIVE 
KVV 987 336 - VHD4.21 PASSIVE

KVV 987 480 - VHD4.21R ACTIVE
KVV 987 481 - VHD4.21R PASSIVE 

 
PDF

VHD4.21 User Guide

VHD4.21 Active Passive Bass Module - User Guide (EN)

 
 
PDF

VHD4.21 Active /Passive Data Sheet

VHD4.21 Active /Passive Data Sheet

 
 
SKP

VHD4.21/2.21 Flybar 3D SKP

VHD4.21/2.21 Flybar 3D SKP

 
 
DWG

VHD4.21/2.21 Flybar 2D DWG

VHD4.21/2.21 Flybar 2D DWG

 
 
DWG

VHD4.21/2.21 Flybar 3D DWG

VHD4.21/2.21 Flybar 3D DWG

 
 
PDF

VHD4.21/2.21 Flybar 2D drawing

VHD4.21/2.21 Flybar 2D drawing

 
 
SKP

VHD4.21 PASSIVE SKP

VHD4.21 PASSIVE SketchUp

 
 
DWG

VHD4.21 PASSIVE 3D DWG

VHD4.21 PASSIVE 3D DWG

 
 
SKP

VHD4.21 ACTIVE SKP

VHD4.21 ACTIVE SketchUp

 

 
 
DWG

VHD4.21 ACTIVE 3D DWG

VHD4.21 ACTIVE 3D DWG

 
 
DWG

VHD4.21 Active 2D DWG

VHD4.21 Active 2D DWG

 
 
DWG

VHD4.21 Passive 2D DWG

VHD4.21 Passive 2D DWG

 
 
PDF

VHD4.21 - 2D

VHD4.21 2D Drawings

 
 
DWG

VHD4.21 Passive - 3D

1:1 scale - clamping points - weight - dwg file

 
 
SKP

VHD Series Sketchup

VHD Series Sketchup - all boxes and accessories

 
 
SKP

VHD4.21, 2.21 Flybar 3D DWG

VHD4.21, 2.21 Flybar 3D DWG

 
 
GLL

VHD4.21 / VHD2.21 EASE Data

VHD4.21 / VHD2.21 EASE Data - .GLL - description

 
 
PDF

VHD5.0 Brochure

VHD5.0 Constant Power Source Array brochure - ENG

 
 
GLL

VHD4.21 / 2.21 EASE Focus

VHD4.21 / 2.21 EASE Focus

 
 
 

VHD2.21/4.21 Cover

Gallery

Product code

KVV 987 352

 

Description

Cover for VHD2.21/4.21

 

VHD4.21 Amplifier transport and fabric cover

Gallery

Product code

KVV 987 390

 

Description

Transport and Fabric Cover for VHD4.21 Amplifier

 

VHD4.21/2.21 Flybar

Gallery

Product code

KVV 987 398

 

Description

Flybar for VHD4.21 or VHD2.21. See VHD4.21 user manual for more instructions.

 

Downloads

SKP

VHD4.21, 2.21 Flybar 3D DWG

VHD4.21, 2.21 Flybar 3D DWG

 

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