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DELTA PRO- 8B Series Standard American
Recommended for professional audio in both sealed and vented enclosures. Ideal for full-range, mid/hi, and
monitor wedges.
SPECIFICATION - Nominal Basket Diameter 8“, 203mm
- Nominal Impedance 16 ohms
- Power Rating Watts 225 W / Music Program 450 W
- Resonance 69 Hz
- Usable Frequency Range 100 Hz - 3.0 kHz
- Sensitivity 97.8
- Magnet Weight 59 oz.
- Gap Height 0.31“, 7.95 mm
- Voice Coil Diameter 2.0“, 50.8 mm
THIELE & Small Parameters - Resonant Frequency (fs) 69 Hz
- DC Resistance (Re) 5.4
- Coil Inductance (Le) 0.82 mH
- Mechanical Q (Qms) 6.43
- Electromagnetic Q (Qes) 0.20
- Total Q (Qts) 0.22
- Compliance Equivalent Volume (Vas) 18.32 liters / 6.47 cu. ft.
- Peak Diaphragm Displacement Volume (Vd) 65.68 cc
- Mechanical Compliance of Suspension (Cms) 0.35 mm/N
- BL Product (BL) 14.1 T-M
- Diaphragm Mass inc. Airload (Mms) 19.3 grams
- Efficiency Bandwidth Product (EBP) 307
- Maximum Linear Excursion (Xmax) 3.0 mm
- Surface Area of Cone (Sd) 218.2 cm²
- Maximum Mechanical Limit (Xlim) 8.0 mm
MOUNTING Information - Recommended Enclosure Volume
Sealed 8-16 liters / 0.30-0.60 cu. ft.
Vented 10-16 liters / 0.40-0.60 cu. ft. - Overall Diameter 8.02“, 203.71mm
- Baffle Hole Diameter 7.36“, 186.94 mm
- Front Sealing Gasket fitted as standard
- Rear Sealing Gasket fitted as standard
- Mounting Holes Diameter 0.28“, 7.11 mm
- Mounting Holes B.C.D. 8.60“, 218.44 mm
- Depth 3.75“, 95.25 mm
MATERIALS of Construction - Copper voice coil
- Polyimide former
- Ferrite magnet
- Vented and extended core
- Die-cast aluminum basket
- Paper Cone
- Cloth cone edge
- Solid composition paper dust cap
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400 W continuous program power capacity |
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100° nominal coverage |
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75 – 20000 Hz response |
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94 dB sensitivity |
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XO-1 dedicated crossover network |
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- 94 dB sensitivity 1 W / 1 m
- 250 W Power handling
- 2" voice coil
- Double treated cone for water protection
- Neodymium magnet system
- Tripie aluminum demodulating rings for ultra low distortion
- Optimal for compact 2-way systems
- Light weight carbon fibre diaphragm
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- 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
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- 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
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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
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