Scanspeak D2905/970000 1” Dome Tweeter 6Ω 225 Watt

Scanspeak D2905/970000 Tweeter, a Classic Range Tweeter. Scanspeak D2905/970000 features a specially hand-coated 1" textile diaphragm, and uses the Symmetrical DRive SD-2 motor, which gives frequency extension above 30KHz, high power handling and low resonances. Very low Fs. Aluminum face plate.

Specification:

• Resonance frequency [fs] 500 Hz
• Mechanical Q factor [Qms] 3.45
• Electrical Q factor [Qes] 0.54
• Total Q factor [Qts] 0.47
• Force factor [Bl] 3.5 Tm
• Mechanical resistance [Rms] 0.41 kg/s
• Moving mass [Mms] 0.45 g
• Suspension compliance [Cms] 0.23 mm/N
• Effective diaph. diameter [D] 33 mm
• Effective piston area [Sd] 8.5 cm²
• Equivalent volume [Vas] 0.02 l
• Sensitivity (2.83V/1m) 89.5 dB
• Ratio Bl/√Re 1.61 N/√W
• Ratio fs/Qts 1068 Hz

Electrical Data:

• Nominal impedance [Zn] 6 Ω
• Minimum impedance [Zmin] 5.7 Ω
• Maximum impedance [Zo] 34.6 Ω
• DC resistance [Re] 4.7 Ω
• Voice coil inductance [Le] 0.01 mH
• Power Handling 100h RMS noise test (IEC 17.1)* 225 W

Voice Coil and Magnet Data

• Voice coil diameter 28 mm
• Voice coil height 3.3 mm
• Voice coil layers 2
• Height of gap 2.5 mm
• Linear excursion ± 0.4 mm
• Max mech. excursion ± 1.5 mm
• Unit weight 0.7 kg

Driver 2“, 110W, 107.5dB, 0.5-18kHz, διάφραγμα τιτανίου, 6.3kg 

The B&C Speakers DE750TN-8 2" titanium HF driver is a world-class high frequency transducer that is capable of extreme output levels combined with incredible fidelity and musicality. A powerful ceramic ferrite magnet structure provides the high magnetic flux density required for the DE750TN's high efficiency, accuracy, and extended high frequency response. A copper cap on the pole piece reduces inductive losses and extends HF capabilities.

Highlights

- 220 watt continuous program power capacity
- 3" (75mm)aluminum voice coil
- Titanium diaphragm
- Copper shorting cap for extended HF response
- 107.5 dB sensitivity
- 2" (horn throat diameter) bolt-on format (4-bolt)
- 500 – 18000 Hz response

Driver 2“, 110W, 108.5dB, 0.5-18kHz,
διάφραγμα τιτανίου, 2.6kg

70W AES compression driver, 1.75 διάφραγμα τιτανίου, 16Ω

The model 2426H is a professionalquality high frequency compressiondriver which incorporates JBL'stitanium diamond diaphragm. Thistitanium diamond structure combinesthe ruggedness of phenolic andcomposite-type diaphragms with theoutstanding frequency response offragile aluminum and exotic metaldiaphragms.

JBL's exclusive suspension, consistingof a three-dimensional diamondpattern, reduces bendingstresses in the diaphragm supportstructure. The depth of the diamondpattern is closely controlled toprovide predictable frequencies forthe 2nd and 3rd normal resonancemodes and for the basic suspensionresonance.

The mathematically determinedphasing plug consists of concentricexponential horns to minimize phasecancellations. Phasing plug, throat exittube and diaphragm assemblies areidentical to the previous model.

All cast parts and tolerances are held to the same levels traditionally associated with JBL designs. Additionally the press-fit assembly and interlocking parts assure greater resistance to the mechanical shock. Diaphragm assemblies are rim centered rather than pin mounted, for instant interchange ability and ease of field service.Mounting is provided for standard25 mm (1 in) three bolt pattern. The front snout may be removed(unscrewed) to allow standard 1 3/8" -18 screw mounting. Through holes for external attachment points are also provided. A machined ring of copper surrounds the pole piece to counteract the inductance of the voice coi1 at high frequencies. After manufacture, the frequency response of each driver is tested for conformity to rigid performance standards.

The 2426H is offered in an 8 ohm impedance, and the otherwise identical 2426J is offered in a 16 ohm impedance.

The 2426H features a removable flange to expose a 1 3/8“-18 snout for screw-on type horns.

• Throat Diameter: 25 mm (1 in)


• Nominal Impedance:2426H - 8 ohms2426J - 16 ohms


• Minimum Impedance: 5 ohms (H), 9 ohms (J) @ 5 kHz


• D.C. Resistance: 3.3 ohms (H), 6.5 ohms (J) +/- 10% @ 25C


• Power Capacity:70 W continuous program above 800 Hz100 W continuous Program above 1.2 kHz


• Sensitivity:107 dB SPL, 1 W @ 1 m, JBL 2344A horn110 dB SPL, 1 W @ 1 m, JBL 2370A horn117 dB SPL, 1 mW on plane wave tubes


• Nominal Efficiency: 25% (800 Hz to 2.5 kHz)


• Frequency Range: 500 Hz to 20 kHz


• Recommended Crossover4: 800 Hz or higher, 12 dB/octave slope minimun


• Diaphragm: 0.05 mm (0.002 in) pure titanium


• Voice Coil Diameter: 44 mm (1% in)


• Voice Coil Material: Edgewound aluminum ribbon


• Flux Density: 1.8 T (18,000 gauss)


• Bl Factor:6.3 N/A(H)9.3 N/A (J)


• Positive voltage to black terminal gives diaphragm motion toward phasing plug


• Mounting:Three 1/4-20 threaded holes, 120 apart on 57.2 mm

(2-1/4 in) diameterFront snout may be removed (unscrewed) to expose standard 1 3/8 in -18 screw threads

• Dimensions: 149 mm (5 7/8 in) diameter, 104 mm (4 1/8 in) depth


• Net Weight: 4.3 kg (9-1/2 lb)