Roksan Darius loudspeakers

 Originally designed to monitor the performance of the Xerxes record player, the principles learnt in its construction have been employed in other loudspeakers in the Roksan range.

Darius tackles the fundamental questions of what a loudspeaker is and what can be achieved from a stereo reproduction system.

A loudspeaker moves the air of the room with reference to some fixed point. With stereo, two fixed points are used. If the two reference points are in turn allowed to move, the intimate detail of the musicians performance is lost, the emotion reduced, and the picture or illusion of the sound stage is blurred and fore shortened. With a Darius loudspeaker system, the necessary steps are taken to ensure that the reference points are immutable.

 

The cabinet of the Darius is one inch thick and internally cross-braced to ensure rigidity, reducing the flexure of the panels. One of the braces has a dual function; it passes directly behind the bass driver and allows this unit to be clamped from both the front and back accurately fixing its position within the cabinet.

The cabinet is then located in an exoskeleton stand, that clamps the cabinet at eight carefully selected nodal points. The stand ensures that the Darius is rigidly held in position within the room. With the bass driver accurately located, the problem then becomes one of mounting the tweeter so that it is immune from the vibrations being produced by the bass unit.

 

The tweeter has its own dedicated mini-baffle which is suspended on four springs from the rest of the enclosure. This affords complete isolation from the rest of the cabinet. Vibrations from the bass driver cannot interfere with the tweeter's operation.

With both drive units now fixed, the reference points are well defined and the result is an exceptionally clear sound and realistic three dimensional sound stage.

The Darius loudspeaker system has the crossover external to the cabinets so that the system can be extended by adding Darius sub woofers and active amplification.

 

Cabinets are available in a wide choice of real wood; Black ash, walnut, teak, oak, rosewood and black piano lacquer finishes.

Dimensions

Darius :  470 x 265 x 405 mm

Stand ;  965 x 445 x 330 mm

Crossover :  280 x 275 x 60 mm

Roksan Caspian Integrated Amplifier mkI

Integrated Amplifier

Specifications

Line Inputs:  5 plus Tape

Input Impedance:  47 k Ω

Input Sesnitivity:  Line 240 mV

Line Outputs:  Tape; 2x Preamplifier

Output Voltage:

Tape Out :  240 mV

Pre Out :  700 mV

Damping Factor:  140 (8 Ω )

Frequency Response:  2,5 Hz - 80 kHz -3 dB

Gain: 

Pre & Power :  40 dB Overall

Preamplifier :  9,3 dB

Power Amp:  30,7 dB

Total Harmonic Distortion

At 8 Ω  :  less than 0,003% (1 kHz)

At $ Ω  :  less than 0,005% (1 kHz)

Signal-to-Noise Ratio

Line :  108 dBa (ref. 500 mV); 85 dBa (ref. 1 W, 8 Ω )

Power Outputs:  Loudspeaker, L & R

Outputs Power:

Better than 70 Watts continuous, into 8 Ω  both channel driven

Better than 100 Watts continuous, into 4 Ω  both channel driven

Current Output:  50 Amps Peak to Peak

Power Supply:  330 VA Ultra Noise Toroidal Transformer, 4 Regulated Supply Rails

Power Source:  100 - 120 V, 50/60 Hz; 220 - 140 V, 50/60 Hz

Power Consumption:  less than 230 W

Dimensions (W x H x D):  432 x 330 x 80 mm (including feet)

Weight:  12 kg

Roksan Caspian Integrated CD mkI

Integrated CD Player

Specifications

Operating System:  CD digital audio system

Frequency Response:  20 Hz - 20 kHz ±0,7 dB

Total Harmonic Distortion:  less than 0,0025% at 1 kHz

Signal-to-Noise Ratio (IHF-A weighted):  105 dB

Wow and Flutter:  Quartz precision

Channel Separation:  100 dB at 1 kHz

Output Voltage:  1 V RMS

Digital Output:  BNC 75 Ω  0,5 Vp-p

Error Correction:  CIRC

Sampling Frequency:  44,1 kHz

D/A Conversion:  Dedicated D/A PCB (TD 1305T BCC-DAC2) Bitstream continuous calibration DAC

Resolution:  18 bits

Oscillation:  3rd Overtone Oscillation

Power Supply:  High quality mains inlet filter. 2 High performance low noise toroidal transformers. One dedicated to the DAC analogue output stage, one dedicated to the Digital circuitry, 7 fully regulated power rails

Laser Environment Enhancer Light (LL):  Roksan patented green light technology

Power Source:  100 - 120 V 50/60 Hz; 220 - 240V 50/60 Hz

Power Consumption:  less than 15 W

Dimensions (W x H x D):  432 x 330 x 80 mm (including feet)

Weight:  10 kg

Roksan Xerxes 20 plus

The original Xerxes launched in 1985 was one of the most important turntables of the eighties. With advanced engineering techniques and radical solutions to address the inherent problems suffered by other turntables, the Xerxes offered a more enjoyable and accurate presentation of music.

Xerxes 20 Plus is the result of over 20 years of research and development and refinement of the Xerxes. 20 based on Roksan’s most advanced record player, the TMS 3.

Features:

Three level decoupling allows for accurate and smooth rotation with absolute minimal vibration

Can be used with both Roksan and other tonearm

Available finishes: White, Black, Rosewood

Specifications:

Main Bearing Spindle:  Hardened tool steel

Roundness & Concentricity:  less than 5 Microns

Length to Diameter ratio :  11:1

Main Bearing Ball:  Super precision Tungsten Carbide

Roundness:  less than 1 Micron

Diameter:  2 mm

Main Bearing Housing:  Solid Phosphor Bronze

Clearance :  2/1,0000”

Inner Platter:  2 Piece Solid Aluminium alloy (Interference fitted non-resonant)

Outer Platter:  2 Piece Solid Aluminium alloy (Interference fitted non-resonant)

Structure:  3 Plinth Design

Isolation:  3 Level De-coupling

Motor:  Custom made 24 pole synchronous

Pulley:  Solid Aluminium alloy

Roundness & Concentricity:   less than 1 Micron

Drive Belt:  Precision ground Neoprene

Motor Mount:  Unique synchronizing bearing

Motor Drive:  External speed controller

Wow & Flutter:  less than 0.02%

Rumble:  less than -80dB

Dimensions (W x H x D):  450 x 370 x 115 mm

Weight:  12 Kg

Roksan Shiraz

One of the most important aspects of Record Player cartridge design is the diamond tip of the stylus.

It is this jewel which has to retrieve information often represented by variations that measure millionths of an inch.

If the profile of this diamond is cut to the wrong shape it will damage records and reduce the amount of retrievable information.

The moving coil Shiraz cartridge has a stylus which we believe is the world's best diamond profile design.

The Swiss made Gyger II has a super fine line profile offering excellent tracking ability with stunning detail retrieval and low surface noise.

The body is made from solid aluminium alloy and fitted with a robust broadcast standard generator uniquely fixed to the body with three spikes giving it precise alignment and coupling without using distortion inducing adhesives. Excessive cantilever movements at certain frequencies are damped by the capacitors mounted directly to the generator over the coil where they accurately preserve the minute signal. The Shiraz produces relatively high output for a moving coil design, which is important for a good signal to noise ratio and channel separation, but requires careful matching to preamplifier phono stage.

Roksan have employed complex engineering techniques in the Shiraz cartridge in order to extract the most information from the groove of your records whilst never damaging the groove itself.

There are several main areas where the Shiraz distinguishes itself from other cartridges:

Astonishing level of detail.

Ease of tracking highly modulated grooves.

Uncompressed dynamic range.

Flat frequency response to beyond 30 kHz allowing harmonics to be naturally reproduced.

These qualities are directly related to sound mechanical and electrical engineering principles.

The Shiraz utilises a broadcast standard moving coil generator rigidly mounted, with 3 spikes, into a solid machined aluminium alloy body.

The Shiraz is fitted with a super fine line stylus profile.

The Shiraz is critically damped balanced cartridge, with ultra low noise surface mount capacitors fitted directly next to the generator's coils.

The Shiraz cartridge is particularly sensitive to precise alignment. The fine line stylus requires fine Vertical Tracking Angle adjustment.

SPECIFICATION

Type: Moving coil

Output:

0.21 mV/cm/sec (RMS)

1.05 mV @ 5cm/sec recorded velocity

Stylus: Super fineline - Gyger II

Cantilever: Aluminium Tube

Tracking weight: 2,2 - 2,5 (2,4 grams recommended)

Cartridge body: 5 axis machined solid aluminium alloy

Generator fixing: Unique 3- point rigid fixing, spiked to body (without adhesive)

Cartridge fixing: Standard 0,5 inch centres (12,7mm)

Recommended load: 30 - 100Ω (100Ω recommended)

Coil impedance: 24Ω

Frequency response: 15 Hz - 30 kHz

Channel balance: Within 1dB

Channel separation: 30 dB

F I M: < 0.5%, 19μ

Cartridge weight: 8,2 g