NTR21-5010JD - Legacy

21-inch cast aluminium chassis, neodymium magnet LF driver

Rigid lightweight carbon fibre loaded cone
Vented magnet assembly for more efficient cooling
Compact high flux Dual Magnet Motor design
Optimised double suspension

Specifications

21in

Diameter

3200W

Continuous power rating

8Ω

Rated impedance

98dB

Sensitivity

Nominal diameter

530mm / 21in

Power rating

1600W

Continuous power rating

3200W

Rated impedance

8Ω

Sensitivity

98dB

Frequency range

30-3000Hz

Chassis type

Cast aluminium

Magnet type

Neodymium

Voice coil diameter

125mm / 5in

Voice coil material

Round copper

Former material

Glass fibre

Cone material

Carbon fibre loaded paper

Surround material

Cloth-sealed

Suspension

Double

Gap height (H_g)

12mm / 0.47in

VC winding height (H_vc)

30mm / 1.18in

Parameters

1661.90cm² / 257.59in²

32.20Hz

Mms

344.10g / 12.14oz

Qms

5.819

Qes

0.339

Qts

0.320

5.57Ω

Vas

276.70l / 9.77ft³

33.85Tm

Cms

0.07mm/N

Rms

11.98kg/s

Le (at 1kHz)

2.25mH

Xmax

9mm / 0.35in

Mounting Information

Overall diameter

550mm / 21.65in

Overall depth

254mm / 10in

Cut-out diameter

492mm / 19.37in

Mounting hole dimensions

12.5x8.5mm / 0.49x0.33in

Number of mounting holes

Mounting hole PCD

520-528mm / 20.5-20.8in

Unit weight

12.8kg / 28.2lb

Packed Dimensions & Weight

Single pack size W x D x H

575mm x 575mm x 280mm / 22.6in x 22.6in x 11.0in

Single pack weight

13.2kg / 29lb

Frequency Response and Impedance Curves

Topmost curve: Frequency response on axis | Secondary curve: Frequency response at 45° off axis

Power rating: Tested for two hours using a continuous, band-limited pink noise signal as per AES standard. Power calculated on minimum impedance. Loudspeaker tested in free air.

Continuous power rating: Defined as 3dB greater than the AES rating.

Sensitivity: Measured on axis at 1W, 1m in 2π anechoic environment.

Parameters: Measured after unit subjected to pre-conditioning signal.

Xmax: H_vc-H_g/2

Watch

NTR21-5010JD Features

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