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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
Electrical Specifications - 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
THIELE & SMALL Parameters - 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
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Nominal Specifications
* Nominal Diameter 8“, 200 mm
* Overall Diameter 8.81/8.18“, 223.8/207.9 mm
* Bolt Circle Diameter 8.27“, 210 mm
* Baffle Cutout Diameter 7.24“, 184 mm
* Depth 4.59“, 116.7 mm
* Flange and Gasket Thickness 0.42“, 10.7 mm
Electrical Specifications
* Minimum Impedance 6.5 Ohm
* Nominal Impedance 8 Ohm
* Nominal Power Handling*** 150 W
* Maximum Power Handling**** 300 W
* Sensitivity (1W/1m) 94 dB
* Frequency Range 80 - 6300 Hz
* Voice Coil Diameter 2“, 52 mm
* Winding Material Aluminium
* Former Material Glass Fiber
* Winding Depth 0.53“, 13.5 mm
* Magnetic Gap Depth 0.31“, 8 mm
* Flux Density 1 T
THIELE & SMALL Parameters
* Resonant Frequency (fs) 76 Hz
* DC Resistance (Re) 5.8 Ohm
* BL Product (BL) 9.86 N/A
* Diaphragm Mass inc. Airload (Mms) 20.9 grams
* Mechanical Compliance of Suspension (Cms) 0.2 mm/N
* Rms 2.11 Kg/s
* Electromagnetic Q (Qes) 0.59
* Mechanical Q (Qms) 4.72
* Total Q (Qts) 0.53
* Compliance Equivalent Volume (Vas) 0.42 ft³, 11.9 dm³
* Surface Area of Cone (Sd) 31“², 200 cm²
* Maximum Linear Excursion (Xmax)* 5.42 mm
* Xdamage** 12 mm
* Coil Inductance (Le) 0.55 mH
* Diaphragm mass (Mmd) 19.4 g
* Eta Zero 0.85 %
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
| ALPHA- Serie 100W- 200W
Recommended for professional audio mid-range applications in a sealed cabinet, or as a mid-bass in a vented
satellite enclosure.
SPECIFICATION
- Nominal Basket Diameter 8“, 203.2 mm
- Nominal Impedance 8 ohms
- Power Rating Watts 125 W / Music Program 250 W
- Resonance 73 Hz
- Usable Frequency Range 58 Hz - 5 kHz
- Sensitivity 94
- Magnet Weight 20 oz.
- Gap Height 0.25“, 6.35 mm
- Voice Coil Diameter 1.5“, 38.1 mm
THIELE & Small Parameters
- Resonant Frequency (fs) 73 Hz
- DC Resistance (Re) 5.3
- Coil Inductance (Le) 0.44 mH
- Mechanical Q (Qms) 4.6
- Electromagnetic Q (Qes) 0.68
- Total Q (Qts) 0.59
- Compliance Equivalent Volume (Vas) 17.7 liters / 0.6 cu. ft.
- Peak Diaphragm Displacement Volume (Vd) 67 cc
- Mechanical Compliance of Suspension (Cms) 0.28 mm/N
- BL Product (BL) 7.8 T-M
- Diaphragm Mass inc. Airload (Mms) 17 grams
- Efficiency Bandwidth Product (EBP) 107
- Maximum Linear Excursion (Xmax) 3.2 mm
- Surface Area of Cone (Sd) 210.0 cm²
- Maximum Mechanical Limit (Xlim) 7.1 mm
MOUNTING Information
- Recommended Enclosure Volume
Sealed 5-7 liters / 0.18-0.25 cu. ft.
Vented 16.7-25.5 liters / 0.59-0.90 cu. ft.
- Overall Diameter 8.24“, 209.2 mm
- Baffle Hole Diameter 7.13“, 181 mm
- Front Sealing Gasket fitted as standard
- Rear Sealing Gasket fitted as standard
- Mounting Holes Diameter 0.22“, 5.5 mm
- Mounting Holes B.C.D. 7.75“, 196.9 mm
- Depth 3.25“, 83 mm
MATERIALS of Construction
- Copper voice coil
- Polyimide former
- Ferrite magnet
- Vented core
- Pressed steel basket
- Paper Cone
- Cloth cone edge
- Solid composition paper dust cap
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Product type
Loudspeaker Chassis
Type
PA
Nominal Diameter
8 "
Nominal Diameter
200 mm
Voice Coil
1.46 "
Voice Coil
37 mm
Overall diameter
209.2 mm
Pitch Circle Diameter
196.9 mm
Cut- out Measurement
178 mm
Mounting holes
8
Diameter of fixing holes
6 mm
Depth
89 mm
Nominal Impedance
8 Ohm(s)
Nominal Load Capacity
130 W
maximum rated load
260 W
Sensitivity (1 W / 1 m)
95 dB
Frequency response
60 - 5000 Hz
Voice Coil Material
Aluminum
Magnet
Ferrite
Depth of the magnetic gap
6 mm
Thiele & Small Parameter
Fs (Resonance Frequency)
80 Hz
Re (DC resistance)
5.9 Ohm(s)
Qms (mechanical quality)
13
Le (inductance of the voice coil)
0.44 mH
Qes (electrical quality)
0.66
Qts (overall quality)
0.63
Vas (equivalent volume)
13.6
Mms (moving mass)
15 g
BL (power factor)
8.2 T/m
Xmax (maximum displacement)
4.67 mm
Cms (elasticity of the suspension)
0.36 mm/N
Sd (membrane area)
191 cm²
Rms (mechanical loss resistance)
0.6 kg/s
Weight
2,2 kg
| The B&C Speakers 8NDL51-16 is an efficient and lightweight cast frame 8" neodymium driver. Its ventilated voice coil gap ensures long term power handling and reduced power compression, and a copper cap on the pole piece reduces inductance and extends high frequency response. The 8NDL51-16 is highly recommended for compact 2-way speaker systems or as the midbass/midrange element in high-output 3-way and 4-way designs.
- Great for line arrays and horn loading
- Neodymium magnet assembly
- Ventilated voice coil gap for reduced power compression
- Inductance-reducing copper cap on pole piece extends HF response
- 2" copper voice coil on polyimide former
- 400 watts continuous program power capacity
- 65 - 3,000 Hz response
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- 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
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