ScanSpeak R2904/7000-00 Ring Radiator

The Revelator series has for years been celebrated for producing the best sounding electro dynamic transducers in the world. Since Scan-Speak was founded in 1970, the audio engineers and R&D experts working on the line have been on a quest to create drivers that reveal all the sound in recordings, hiding nothing from the listener. This quest has resulted in several revolutionary inventions that remove distortion in the magnet systems and in the moving parts of the speaker. The philosophy is that the sound has to be very dynamic, giving a perfect transient response and providing tonal balance.

In the Revelator tweeters, additional enhancements have been made to reduce distortion and power compression, and to optimize airflow in the chambers, producing several unique tweeter designs.

Driver Highlights: 1" ring radiator, SD-2 neodymium motor, non resonant aluminium chamber, multiple chamber low compression design, machined aluminium faceplate and phase plug.

The Scan-speak R2904/7000 tweeter is the new flagship tweeter in the Scan-speak line. This tweeter incorporates many innovative design concepts.

The first notable difference is the use of a phase plug. The dome is attached to the phase plug, so the radiating area is now concentrated around the voice coil. This offers more control and reduces distortion and loss that occur at the center of the dome on dome tweeters. The phase plug also acts as a wave guide, reducing high frequency cancellations. A specially designed venting system uses a needle to cut down on turbulence in the air cavity. Better dynamics are achieved by not using ferrofluid, voice coil cooling is performed by the venting system and conduction through copper rings. The new SD-2 neodymium magnet system improves transient response.

TECHNICAL DATA:
Sensitivity 2.83V/1M 94.5dB
Free air resonance Fs 520 Hz
DC resistance 3.0 ohm
V.C. inductance 0.01 mH
Power 12dB@Hz 150W@2.7K
Effective cone area 5.6 cm2
V.C. diameter 28 mm
Lin. & max. excursion ±0.2 / ±1.6mm
Force factor BL Product 2.8 Tm
Moving mass incl. air 0.3 g
Net weight 0.42 kg

Outside diameter: 104mm
Cut out: 70mm
Depth: 30.9mm
25.4mm = 1" = 2.54cm