| Content | 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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Nominal Specifications
* Nominal Diameter 8“, 200 mm
* Overall Diameter 8.81/8.18“, 223.8/203.9 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 6.4 Ohm
* Nominal Impedance 8 Ohm
* Nominal Power Handling*** 200 W
* Maximum Power Handling**** 400 W
* Sensitivity (1W/1m) 95 dB
* Frequency Range 60 - 5000 Hz
* Voice Coil Diameter 2“, 52 mm
* Winding Material Aluminium
* Former Material Glass Fiber
* Winding Depth 0.76“, 19.3 mm
* Magnetic Gap Depth 0.35“, 9 mm
* Flux Density 1.15 T
THIELE & SMALL Parameters
* Resonant Frequency (fs) 58 Hz
* DC Resistance (Re) 5.1 Ohm
* BL Product (BL) 11.3 N/A
* Diaphragm Mass inc. Airload (Mms) 24 grams
* Mechanical Compliance of Suspension (Cms) 0.31 mm/N
* Rms 0.93 Kg/s
* Electromagnetic Q (Qes) 0.34
* Mechanical Q (Qms) 9.4
* Total Q (Qts) 0.35
* Compliance Equivalent Volume (Vas) 0.62 ft³, 17.6 dm³
* Surface Area of Cone (Sd) 30.8“², 199 cm²
* Maximum Linear Excursion (Xmax)* 8.15 mm
* Xdamage** 13.5 mm
* Coil Inductance (Le) 0.55 mH
* Diaphragm mass (Mmd) 22 g
* Eta Zero 1.02 %
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
| 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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- 8” neodymium magnet driver with 1.5” voice coil, providing 200Wrms (AES) continuous power handling
- Suitable for line array applications, utilizing a space-efficient octagonal chassis profile
- Optimized flux distribution in the magnet assembly provides low harmonic distortion
- M-roll surround provides progressive excursion control, generating a smooth frequency response
- Intelligent heat management in both chassis and magnet assembly design offers reduced thermal compression
General specifications
| Nominal diameter (mm/in) |
203/8 |
| Power Rating (AES, W rms) |
200 |
| Nominal impedance (Ω) |
8 |
| Voice coil diameter (mm/in) |
50.8/2.0 |
| Magnet type |
Neodymium |
| Chassis type |
Cast aluminium |
| Sensitivity (dB) |
92 |
| Frequency range (Hz) |
70-6000 |
| Coil material |
Round copper |
| Cone material |
Kevlar loaded paper |
| Surround material |
Cloth-sealed |
| Suspension |
Single |
| Xmax (mm/in) |
4/0.16 |
| Gap depth (mm/in) |
8.0/0.32 |
| Voice coil winding width (mm/in) |
15.0/0.63 |
Small Signal Parameters
| D (m/in) |
0.17 |
| Fs (Hz) |
80.3 |
| Mmd (g/oz) |
22.39 |
| Mair |
1.94 |
| Qms |
1.33 |
| Qes |
0.59 |
| Qts |
0.41 |
| Re (Ω) |
5.85 |
| Vas (lt/ft3) |
11.3/0.399 |
| BI (Tm) |
11.22 |
| Cms (mm/N) |
0.16 |
| Rms (kg/s) |
9.6 |
| Le (mH) |
|
Mounting Information
| Overall diameter (mm/in) |
225/8.8 |
| Overall depth (mm/in) |
100/4.16 |
| Cut-out diameter (mm/in) |
187/7.4 |
| Mounting slot dimensions (mm/in) |
6.5/0.26 |
| Number of mounting slots |
8 |
| Mounting slot PCD/ width accross flats |
210/8.3 |
| Unit weight (kg/lb) |
1.52/3.34 |
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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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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
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