This system
is a highly developed and refined version of the Tannoy loudspeaker. It
utilises the dual concentric principle to provide an integrated sound source
which, over the past quarter of a century, has become an established quality
reference in recording, broadcasting and television studios.
The Tannoy
system combines a precision built high frequency compression horn driver with a
direct radiator bass unit embodying the unique Girdacoustic ( on HDP385A and
HDP315A only) reinforced cone.
These two
drivers are mounted concentrically on a single frame and magnet assembly. They
are driven through a sophisticated
separate crossover network creating a system covering the entire frequency
range from 20 Hz to 20 kHz.
Distortion
products are negligible, and the wide, smooth frequency range with excellent
transient response result in very natural reproduction and an almost total lack
of colouration.
Sensitivity
is high. A 20 Watt amplifier used with the smaller systems is more than
adequate for normal domestic purposes. This sensitivity combined with high
power handling capacity, makes the larger units ideal for the most
sophisticated professional or home installations.
ARDEN
The
outstanding performance characteristics of the HPD385A Integrated Loudspeaker
System are completely realised by the Arden, the largest model in the range. An
extended bass response is obtained through the use of a triple ducted port
system resulting in very low distortion products. The system is front recess
mounted to avoid tunnel and diffraction effects. With generous internal
strutting for high rigidity, the internal cavity is critically damped with
graded acoustic foam ensuring lack of colouration in the bass response.
A - Rolled
surround for stability in low bass response
B - Unique
ribbing virtually eliminates cone break-up ensuring smooth response and
extraordinarily high power capacity
C- High
temperature voice coil
D -
Dustproof, acoustically transparent sealing dome
E -
Concentric HF horn (completed by curved LF cone)
F - Phase
compensating multiple throat for extended and smooth HF response
G - Acoustic
balance cavity for reduced distortion
H -
Precision contoured high frequency diaphragm
I -
Aluminium voice coil conductor for superb HF response
J -
Exclusive magnetic shunt for increased LF flux
The
Crossover Network
The Tannoy
crossover network divides the electrical energy from the amplifier between the
high frequency compression driver and the low frequency direct radiator and
makes a vital contribution to the overall performance of the system.
It
incorporates two controls. One permits attenuation of the treble energy output
only in the range above 5 kHz. The other allows the output of the high
frequency unit to be increased or attenuated over its entire range from 1 kHz
to 20 kHz, compensating for roomacoustics and individual preference.
The
crossover is assembled to the very highest standards on a fibreglass printed
circuit board. Solid dielectric capacitors are used throughout and all
resistors and inductors are very generously rated.
The design
of the crossover ensures that the complete loudspeaker system has an excellent
impedance characteristic which provides the ideal load for any amplifier.
Components
Integrated
Drive System
The Tannoy
Integrated Drive System consists of a direct
radiator bass unit and a high frequency horn-loaded compression driver
both located concentrically within the same frame and magnet assembly, this is
why it is known as the dual concentric system.
Bass Unit
This is a
low resonance speaker with a 2" high temperature voice coil. The unique
Girdacoustic reinforced cone ensures true piston action and smooth performance
extending well into the midrange region.
Treble Unit
High
frequencies are reproduced by a horn-loaded compression driver utilizzing a
duralumin diaphragm and a 2" diameter aluminium voice coil.
Specifications
Low
Frequency Direct Radiator
Maximum
Diameter: 420 mm (16 ½")
Voice Coil
Diameter: 50 mm (2")
Bl Factor in
gauss/cm: 20 x 10⁶
Fundamental
Resonance: 20 Hz
High
Frequency Compression Driver
Duralumin
Diaphragm: 50 mm (2")
Voice
Coil Diameter: 50 mm (2")
Horn Cut-off
Frequency: 500 Hz
Drive
System: 3828
Power
Handling Capacity: 85 W
Nominal
Impedance: 8 ohms
Frequency
Response: 30 Hz - 20 kHz, ±4 dB
Sensitivity;
Input Watts produce 96 dB at 1 m: 3
Crossover
Frequency: 1 kHz
System
Dimensions (H x W x D): 990 x 660 x 370
mm (39" x 26" x 14 ½"
Weight: 56 kg (shipping)