B & C Speakers 8-NDL51 Speaker neodymium 8″ 400W

50 mm (2 in) copper voice coil
70 - 3000 Hz response
94 dB sensitivity
Neodymium magnet allows a very light yet powerful motor assembly
Shorting copper cap for extended HF response
400 W continuous program power capacity
Ventilated voice coil gap for reduced power compression

Compatible with NEXO PS8 

• Specifications
  • Nominal diameter200 mm (8.0 in)
  • Nominal impedance8 Ω
  • Minimum impedance6.6 Ω
  • Nominal power handling *200 W
  • Continuous power handling *400 W
  • Sensitivity (1W/1m) *94.0 dB
  • Frequency range65 - 3000 Hz
  • Voice coil diameter51 mm (2.0 in)
  • Winding materialCopper
  • Former materialGlass Fibre
  • Winding depth17 mm (0.65 in)
  • Magnetic gap depth8 mm (0.31 in)
  • Flux density1.05 T
• Design
  • Surround shapeDouble Roll
  • Cone shapeExponential
  • Magnet materialNeodymium Inside Slug
  • SpiderSingle
  • Pole designStraight Pole
  • Woofer cone treatmentTWP Waterproof Both Sides
  • Recommended enclosure14.0 dm3 (0.49 ft3)
  • Recommended tuning65 Hz
• Parameters *
  • Fs66 Hz
  • Re5.3 Ω
  • Qes0.41
  • Qms3.6
  • Qts0.37
  • Vas14.0 dm3 (0.5 ft3)
  • Sd220.0 cm2 (34.1 in2)
  • η₀1.0 %
  • Xmax7.0 mm
  • Xvar7.0 mm
  • Mms28 g
  • Bl12.4 Txm
  • Le0.5 mH
  • EBP160 Hz
• Mounting And Shipping Info
  • Overall diameter225 mm (8.8 in)
  • Bolt circle diameter210 mm (8.3 in)
  • Baffle cutout diameter187.0 mm (7.4 in)
  • Depth90 mm (3.5 in)
  • Flange and gasket thickness11 mm (0.4 in)
  • Air volume occupied by driver1.1 dm3 (0.04 ft3)
  • Net weight1.8 kg (4.0 lb)
  • Shipping units1
  • Shipping weight2.2 kg (4.8 lb)
  • Shipping box300x160x180 mm (11.8x6.3x7.1 in)

• 93 dB sensitivity 1 W / 1 m
• 200 W + 80 W Power Handling
• 2" + 1.75" Sandwich Voice Coil
• Single Point Source providig coherent Wave Front
• 90° conical Dispersion
• Optimal for compact 2- or 3-way Systems

Nom. Diameter     200 mm (8 in)
Overall Diameter     223.75/207.9 mm (8.81/8.19 in)
Bolt Circle Diameter     210 mm (8.27 in)
Baffle Cutout Diameter     183 mm (7.20 in)
Depth     110.7 mm (4.36 in)
Flange and Gasket Thickness     10.7 mm (0.42 in)
Net Weight     2.7 Kg (5.95 lb)
Shipping Box
(Single Carton Box)     246x246x150 mm (9.69x9.69x5.91 in)
Shipping Weight     3.4 Kg (7.50 lb)


Nom. Impedance     8 Ohm     8 Ohm
Minimum Impedance     6.6 Ohm     6.9 Ohm
Nom. Power Handling ***     250 W     30 W
Max Power Handling ****     500 W     60 W
Sensitivity (1W/1m) *****     95 dB     107 dB
Frequency Range     75÷4000 Hz     1500÷20000 Hz
Voice Coil Diameter     65 mm (2.50 in)     37 mm (1.46 in)
Winding Material     Al     Al
Former Material     Glass Fiber     Kapton
Winding Depth     12.5 mm (0.49 in)     2.1 mm (0.08 in)
Magnetic Gap Depth     8 mm (0.31 in)     2.6 mm (0.10 in)
Flux Density     1.2 T     1.85 T
Min. Cross. Freq. ******     -     1700 Hz
Dispersion Angle     -     90°
Diaphragm Material     -     Ketone Polymer
Diaphragm Shape     -     Annular


Fs     76 Hz
Re [LF]     5.5 Ohm
Re [HF]     5.5 Ohm
Qes     0.31
Qms     10.5
Qts     0.3
Vas     12.6 dm^3 (0.44 ft^3)
Sd     211 cm^2 (32.71 in^2)
Xmax *     4.92 mm
Xdamage **     10.2 mm
Mms     22 g
Bl     13.7 N/A
Le     0.51 mH
Mmd     20.3 g
Cms     0.2 mm/N
Rms     1 Kg/s
Eta Zero     1.74 %
EBP     245 Hz

Nominal Specifications

• Nominal Diameter 8“, 200 mm
• Overall Diameter 8.81/8.18“, 223.7/207.9 mm
• Bolt Circle Diameter 8.27“, 210 mm
• Baffle Cutout Diameter 7.20“, 183 mm
• Depth 3.88“, 98.5 mm
• Flange and Gasket Thickness 0.43“, 10.8 mm

• Minimum Impedance 7 Ohm
• Nominal Impedance 8 Ohm
• Nominal Power Handling*** 200 W
• Maximum Power Handling**** 400 W
• Sensitivity (1W/1m) 95 dB
• Frequency Range 70 - 5000 Hz
• Voice Coil Diameter 2“, 52 mm
• Winding Material Aluminium
• Former Material Glass Fiber
• Winding Depth 0.65“, 16.5 mm
• Magnetic Gap Depth 0.31“, 8 mm
• Flux Density 1.15 T

• Resonant Frequency (fs) 65 Hz
• DC Resistance (Re) 5.7 Ohm
• BL Product (BL) 13.5 N/A
• Diaphragm Mass inc. Airload (Mms) 25,3 grams
• Mechanical Compliance of Suspension (Cms) 0.24 mm/N
• Rms 3.38 Kg/s
• Electromagnetic Q (Qes) 0.32
• Mechanical Q (Qms) 3.1
• Total Q (Qts) 0.29
• Compliance Equivalent Volume (Vas) 0.46 ft³, 12.9 dm³
• Surface Area of Cone (Sd) 30.38“², 196 cm²
• Maximum Linear Excursion (Xmax)* 6.92 mm
• Xdamage** 15.7 mm
• Coil Inductance (Le) 0.46 mH
• Diaphragm mass (Mmd) 23.7 g
• Eta Zero 1.06 %

Notes

• *Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3)
• **Maximum excursion before permanent damage
• ***2 Hours Test According to AES 2-1984 Rev. 2003
• ****Maximum power is defined as 3dB greater than nominal power

• JBL Control 28 Factory Speaker Woofer Part # 124-58001-00
• This is a complete brand new JBL, Control 28 woofer
• Voice coil: 1-1/2" (25mm)
• Diameter: 8-1/4" (210mm) 9-1/4" (235mm) diagonally
• Impedance: 8 ohm, DCR: 6 ohm
• Poly cone with rubber edge
• Fits JBL Driver and Cabinet Models: JBL: Control 28, Control 28T, Control 28T60, Control 28WH, 123-10002-00, 1231000200124-58001-00, 1245800100

• 96 dB Sensitivity 1 W / 1 m
• 200 W Power Handling
• 2" Aluminium Sandwich Voice Coil for low Power Compression
• Double treated Cone for Water Protection
• Neodymium Magnet System
• Triple Aluminum demodulating Rings for ultra low Distortion
• Optimal for compact 2- or 3-way Systems