Haut-parleur Coaxial Radian 508/2B
[5208C-8+8] Avis/Critiques Radian’s 508/2B coaxials are, quite simply, the best ceiling loudspeakers in
the world. First of all, they are true coaxial loudspeakers. This means much
more than a high frequency unit mounted coaxially with the LF unit. Radian uses
one of the best com-pression drivers ever developed, coupled directly to a LF
center pole with a 1” horn machined into the shape of an exponential horn, which
loads the compression driver at a taper rate at least two octaves below
crossover.
TRUE 1”
COMPRESSION DRIVER
90º CONICAL DISPERSION
ULTRA RELIABLE
HIGH POWER HANDLING CAPACITY
8” AND 12” SIZES
HIGH SENSITIVITY
This is a key element in preventing the coloration often associated with
compression drivers. In an effort to use the smallest horn possible, most driver
system designs use a taper rate which protects the driver from damage, but has
the highest cutoff which will accomplish this. Radian’s taper rates have much
lower cutoff frequencies. This combina-tion presents a coaxial loudspeaker which
is not only free from coloration, but is so musical that it goes far beyond the
previous bounds of what can be accomplished with distributed speaker designs.
The result is remarkably free of spurious resonances, offering greater gain
before feedback for voice. Moreover, it has a very linear response, for high
resolution of musical subtleties.
Radian coaxials can be afforded in most voice-only designs, but provide
foreground installations as an alternative to systems in conventional enclosures
which are bulky, unsightly and expensive to fly or hang. Radian ceiling
installa-tions permit enormous spl’s confined to specific areas like a dance
floor, while bar areas are foreground levels and dining areas are background
level, all in the same room. The Radian 508/2B coaxials redefine the ceiling
installation, and are installed in standard commercial ceiling enclosures.
| FREQUENCY
RESPONSE |
50 Hz – 20 kHz |
| MAXIMUM POWER
HANDLING* |
200 watts RMS |
| SENSITIVITY** |
95 dB |
| RECOMMENDED
CROSSOVER*** |
1800 Hz |
| NOMINAL IMPEDANCE
(LF/HF) |
8 ohms/8 ohms |
| VOICE COIL DIAMETER
(LF/HF) |
2.0”/1.75” (50.8mm/44.45mm) |
| NOMINAL
DISPERSION**** |
120º |
| WOOFER CONE
MATERIAL |
Reinforced Paper |
| DIAPHRAGM
MATERIAL |
0.002” Aluminum |
| BASKET MATERIAL |
Stamped Steel |
| OVERALL
DIAMETER |
8.25” (209.55mm) |
| MOUNTING BOLT
CIRCLE |
7.75” (196.85mm) |
| CUT-OUT
DIAMETER |
7.125” (180.975mm) |
| OVERALL DEPTH |
5.0” (127mm) |
| INPUT
CONNECTORS: |
|
| HF |
0.25” terminals (6.35mm) |
| LF |
0.205” terminals (4.75mm) |
| Weight |
8.02 lbs. (3.64 kg) |
| THIELE/SMALL
PARAMETERS: |
|
| QTS |
0.3961 |
| QMS |
4.97 |
| QES |
0.4304 |
| VAS (FT³) |
0.8 (23.5 liters) |
| FS (Hz) |
73 |
| XMAX (IN) |
0.03 |
| RE (ohms) |
6.3 |
| SD (IN²) |
34.13 | *EIA
Standard RS-426A
**One watt at one meter
***12 dB/octave
****-6 dB
|
