Roksan Audio Platinum STI308 User manual

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ROKSAN AUDIO LIMITED
6 NORTHFIELD INDUSTRIAL ESTATE
BERESFORD AVENUE ALPERTON
MIDDLESEX HA0 1NW ENGLAND
TEL. [phone]
[phone]
FAX. [phone]
ST1308
Dual Mono Stereo Power Amplifier
USER MANUAL

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 2ENGLISH
Congratulations on your purchase of the ROKSAN Platinum ST1308 Stereo Power Amplifier. This power
amplifier is designed and manufactured to the highest specification and rigorously tested to offer you
unsurpassed performance for many years of trouble-free pleasure.
Your Platinum power amplifier is at the heart of your hi-fi system. Correct installation, set-up and operation of
this power amplifier and its partnering equipment will have a profound influence on the sonic performance of the
entire system.
Please read the contents of this manual thoroughly. It will help you to understand your hi-fi equipment better and
enhance your listening pleasure.
This manual is divided into the following sections:
•Safety Instructions (accompanying card)
•Introduction
•Cautions
•Installation
•Setup
•Operation
•Troubleshooting
•Guarantee
•Specifications
•Notes
U
UN NP PA AC CK KI IN NG G
Included in the packing of your Platinum power amplifier you will find:
•One mains lead fitted with the correct mains power plug for your country
•One information pack and warranty card
After removing these items please retain all packing materials. Correct packing is necessary for transportation of
your Platinum power amplifier.
M
MA AI IN NT TE EN NA AN NC CE E
After disconnecting the power amplifier from the mains supply, the cabinet and front panel may be cleaned with a
lightly dampened soft cloth. A Av vo oi id d u us si in ng g a ab br ra as si iv ve es s o or r s so ol lv ve en nt ts s. .
E
EU U D DI IR RE EC CT TI IV VE ES S
This product is designed to comply with the legal provisions of EU Directives 89/3336/EC and 72/23/EC. The
standards which have been applied are those which were in force at the time of the introduction of this product.
This product bears the CE mark.
This product is compliant to EN 60065.
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Th hi is s p pr ro od du uc ct t m mu us st t b be e e ea ar rt th he ed d. .Please ensure that other equipment connected to it is earthed according to the
manufacturer’s instructions.
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Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 3ENGLISH
A
AC C M MA AI IN NS S S SU UP PP PL LY Y
Your Platinum power amplifier is set to operate from a fixed supply voltage which is marked on a label next to
the mains input plug. Before connecting the mains lead please check that your mains supply corresponds to this
label as below:
230V Products Voltage Range: 220V – 240V
115V Products Voltage Range: 100V – 120V
100V Products Voltage Range: 90V – 110V
The mains lead supplied with this product has an IEC mains socket which plugs into the IEC connector on the
unit’s rear panel. The other end is normally attached to the appropriate mains plug for your country. In the UK
this is the standard UK13A plug.
This plug should ordinarily not be removed from the lead. If you do remove it, please dispose of it safely so that it
cannot be plugged into a mains socket whilst in a potentially dangerous condition. We suggest that you obtain
from your dealer a complete replacement lead.
Should you move to another area where either the mains voltage or the mains plugs are different from those as
supplied with your power amplifier, please contact the appointed ROKSAN distributor for assistance.
P
Pl le ea as se e o ob bs se er rv ve e c co or rr re ec ct t m ma ai in ns s p po ol la ar ri it ty y a at t a al ll l t ti im me es s. .
The power amplifier mains fuses are located on the rear panel next to the IEC mains connector. These must only
be replaced by the fuse type and rating as described on the fuse rating label on the rear panel of the unit.
If the equipment is likely to be unused for some time, unplug it from the mains supply.
G
GE EN NE ER RA AL L C CA AU UT TI IO ON NS S
F
FC CC C W WA AR RN NI IN NG G
This equipment may generate or use Radio Frequency energy. The user may lose the right to operate this
equipment if unauthorised modifications are made.
I
IN NT TE ER RF FE ER RE EN NC CE E
Properly installed, this unit should not cause harmful interference to radio communications, There is, however, no
guarantee that such interference will not occur in a specific installation. If interference arises (which you can
determine by switching the unit off and on) you could try to remedy this problem by the following:
•Re-orient or re-locate the receiving antenna
•Increase the distance between the power amplifier and receiver
•Connect the unit to a different mains circuit from that of the receiver
•Consult your ROKSAN appointed dealer or an experienced Radio/TV technician for help and advice
L
LO OC CA AT TI IO ON N
Your Platinum power amplifier should be located in a well ventilated area and kept away from sources of
heat, dust, humidity and direct sunlight.
The power amplifier may be positioned either as a free standing unit or alongside another audio/video product.
Never place the preamplifier on carpet or any surface likely to hinder normal ventilation.
Never allow liquids or other objects to fall into the unit.
This unit contains no user serviceable parts.
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Do o N No ot t r re em mo ov ve e a an ny y p pa an ne el ls s o or r a at tt te em mp pt t t to o s se er rv vi ic ce e i it t y yo ou ur rs se el lf f. . U Un na au ut th ho or ri is se ed d s se er rv vi ic ci in ng g w wi il ll l v vo oi id d t th he e
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wa ar rr ra an nt ty y. .
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Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 4ENGLISH
R
RO OK KS SA AN N S St te er re eo o P Po ow we er r A Am mp pl li if fi ie er r- - F Fr ro on nt t P Pa an ne el l V Vi ie ew w
1LHC Mode Indicator 2Power Button 3RHC Mode Indicator
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Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 5ENGLISH
R
RO OK KS SA AN N S St te er re eo o P Po ow we er r A Am mp pl li if fi ie er r - - R Re ea ar r P Pa an ne el l V Vi ie ew w
1LHC RCA Input
1ALHC Balanced XLR Input
2RHC RCA Input
2ARHC
Balanced XLR Input
3RHC Input RCA/MUTE/XLR Switch
4LHC Input RCA/MUTE/XLR Switch
5LHC Speaker Output (1)
6 LHC Speaker Output (2)
7 RHC Speaker Output (1)
8 RHC Speaker Output (2)
9 IEC Mains Input
10 Voltage/Fuse Label
11 Mains Fuse Holder
1A
1 3 4 6 8 9
2A2 7
5 11
10

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 6ENGLISH
C
CO ON NN NE EC CT TI IN NG G M MA AI IN NS S P PO OW WE ER R
Please refer to front & rear panel view on Pages 4 & 5.
The moulded IEC connector of the supplied mains lead should be plugged into the socket (9) on the rear of the
unit first and then plugged into the mains supply. The Mains power switch (2) is on the front panel of the power
amplifier. This switch is normally left on. I If f t th he e u un ni it t i is s l li ik ke el ly y t to o b be e u un na at tt te en nd de ed d f fo or r a a p pe er ri io od d o of f t ti im me e ( (W We ee ek k- -e en nd d, ,
H
Ho ol li id da ay ys s e et tc c. .) ) s sw wi it tc ch h i it t o of ff f a an nd d f fo or r a ab bs so ol lu ut te e s sa af fe et ty y u un np pl lu ug g t th he e m ma ai in ns s l le ea ad d f fr ro om m t th he e w wa al ll l. .
Choose a non-resonant, rigid shelf/structure to place your power amplifier on
(e.g. dedicated High quality equipment stand with adequate ventilation).
The Platinum power amplifier utilises specially designed decoupling feet
which reduce mechanical vibrations reaching the internals. This feature
enhances performance of the power amplifier. *** See opposite:
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SI IG GN NA AL L C CO ON NN NE EC CT TI IO ON NS S
Signal Input connections:
There are 2pairs of Inputs on your Platinum power amplifier – x2 RCA (1 & 2) for LHC & RHC.
x2 Balanced XLR (1A& 2A)for LHC & RHC.
Single-ended inputs accept RCA Phono Connectors and should be connected according to the standard
convention Right Channel – Red ; Left Channel – White
Balanced inputs accommodate XLR connectors. These two inputs are provided with a selector switch at the back
and can be set to single-ended (RCA) or Balanced (XLR) or be Disconnected (Mute).
*** See below:
Single ended RCA Input
NOTE:
Only one channel shown; repeat
for the other channel.
Connect to Preamplifier Output.
Balanced XLR Input
NOTE:
Only one channel shown; repeat
for the other channel.
Connect to Preamplifier Output.
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RCA
RCA
XLR
XLR

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 7ENGLISH
IMPORTANT NOTE: For optimum performance it is recommended to use high quality inter-connect cables
such as ROKSAN HDC-02A high definition analogue Cable.
L
LO OU UD DS SP PE EA AK KE ER R C CO ON NN NE EC CT TI IO ON NS S
The Platinum power amplifier utilises very high quality speaker binding post terminals; (5 and/or 6) for the
Left Channel and (7 and/or 8) for the Right Channel. The loudspeakers are connected to the amplifier via these
terminals.
Suitable spade connectors or bare speaker wire can be fitted through the cross-holes of the Platinum power
amplifier speaker terminals.
Suitable 4mm plugs can also fit through the end holes. Note: 4mm plugs must be EU approoved.
There are two basic types of cable –
•Figure 8 cable has two insulated conductors which lie parallel, either side by side, or spaced by insulation.
•Overall sheathed cable has both conductors insulated and enclosed in an overall plastic sheath.
Carefully remove any overal sheath or split the figure 8 cable to a depth of about 75mm (3”).
Carefully strip the insulation on each wire to a depth of about 12mm (1/2”) exposing the bare core. If the
conductor is stranded, twist the strands together on each conductor.
Unscrew the binding post. There is a cross-hole about 10mm from the panel end of the binding post. Insert the
bared conductor through the hole and tighten the binding post securely making sure that there are no loose
strands or bare ends protruding through the post.
Carefully observe polarity ensuring that the RED (+) speaker terminal is connected to the RED (+) amplifier
terminal and the BLACK/WHITE (-) speaker terminal to the WHITE (-) amplifier terminal.
When both left and right channels are connected to their respective speakers the amplifiers are ready for use.
IMPORTANT NOTE: For optimum performance it is recommended to use high quality cables such as ROKSAN
HDC-02S high definition Loudspeaker Cable. Many speaker cables such as the ROKSAN HDC-02S are
directional. Please observe this directionality. DO NOT use speaker cable with conductor size less than 16 AWG
(1.6mm Diameter). The Binding posts accept conductor sizes up to 12 AWG.
*** See below:
Standard Single Wired configuration
NOTE:
On both channels, No. (2) Outputs are used.
You can use either No. (1) or No. (2) Outputs.
LHC
RHC

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 8ENGLISH
Multi-Amping & Multi-Wiring The Loudspeakers Operation
If the Loudspeakers utilise more than one drive unit with individual input terminals, for example a Tweeter and a
Woofer, then Bi-Amping could improve the overall performance. Dedicating one amplifier to the Tweeter and
another amplifier to the Woofer isolates them from each other thus reduces ‘distortion’ and increases reserved
power and dynamics. Speakers generally work far better with most amplifiers when Multi-Amped.
Note: Bi-Wiring connects the Woofer and the Tweeter directly and independently to the amplifier’s low
impedance output and is the a first step towards Bi-Amping.
Bi- Wired configuration
NOTE:
Only right channel shown. For example:
No. (1) connected to the Tweeter (HF) &
No. (2) connected to the Woofer (LF).
Repeat for the other channel.
* Note in Bi-wired mode, any Terminal Links
on the speakers must be removed.
Bi- Wired configuration (Cross-hole)
NOTE:
Only left channel shown; Both No. (1 &2)
Cross-hole Outputs are used.
* No bare wire strands are exposed.
* Repeat for the other channel.
LHC HF
LHC LF
RHC HF
RHC LF

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 9ENGLISH
Standard Single Wired configuration
NOTE:
Speaker terminal Links are in place and only one set
of speaker cables used to connect the amplifier
outputs to the speaker input terminals.
* Repeat for the other channel.
Bi- Wired configuration
NOTE:
Speaker terminal Links are removed and two sets of
speaker cables are required to connect the amplifier’s
output (1) to the speaker’s Tweeter input terminal and
amplifier’s output (2) to the speaker’s Woofer input
terminal.
* Repeat for the other channel.
ONE SET
OF
CABLES
LINKS
IN PLACE
TWEETER
‘HF’
WOOFER
‘LF’
LINKS
REMOVED
TWEETER
‘HF’
WOOFER
‘LF’
TWO
SETS OF
CABLES
‘HF’
‘LF’
TWEETER
WOOFER
TWEETER
WOOFER

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 10 ENGLISH
Please refer to front & rear panel view on Pages 4 & 5.
S
SW WI IT TC CH HI IN NG G O ON N
The Mains power switch (2) is on the front panel of the power amplifier. This switch is normally left on. I If f t th he e u un ni it t
i
is s l li ik ke el ly y t to o b be e u un na at tt te en nd de ed d f fo or r a a p pe er ri io od d o of f t ti im me e ( (W We ee ek k- -e en nd d, , H Ho ol li id da ay ys s e et tc c. .) ) s sw wi it tc ch h i it t o of ff f a an nd d f fo or r a ab bs so ol lu ut te e
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sa af fe et ty y u un np pl lu ug g t th he e m ma ai in ns s l le ea ad d f fr ro om m t th he e w wa al ll l. .
When switched ON, after running a quick self-test, your Platinum Power Amplifier enters operational mode.
The MODE Indicator Lights (1 & 3) will glow RED.
AUTOMATIC OPERATION
The Platinum Power Amplifier auto senses the audio signal and remains operational while there is a signal
present with the MODE indicators RED. It will prepare itself for standby after approximately 2 minutes of no
signal and the MODE indicators will change colour to ORANGE. If there is still no signal for about 20 minutes, it
will go into stand by and the MODE indicators will glow GREEN. As soon as a signal is detected, it will come out
of standby and revert to operational mode and the MODE indicators will glow RED again.
With this facility the Platinum Stereo Power Amplifier is ideal for Multi-amping, high-end A/V installations or in
any application, (e.g. multi-room), where the amplifier is required to switch ON and OFF with the rest of the
system with no loss of functionality.
K
KN NO OW W Y YO OU UR R S ST TE ER RE EO O P PO OW WE ER R A AM MP PL LI IF FI IE ER R
•When you first power up from the Power Switch on the front panel, the amplifier runs a quick self-test and
then enters operational mode with the Mode Indicators glowing RED.
•During Standby, the power consumption of the amplifier is reduced thus reducing generated heat.
•If the amplifier detects a fault, such as power rail failure, over current etc. it will go into protection mode and
the indicator(s) will flash. You can bring the amplifier out of this mode by simply switching it Off and On; but
only when the fault is cured (for example after over heating or after over current detection).
•The amplifier overheats through overload or lack of ventilation. Frequent occurrence of this requires
relocating the unit where there is ample ventilation and/or bi-amping to ensure plenty of ‘drive’.
•In the unlikely event of an internal fault such as a power supply fault, the amplifier will go to permanent
Standby.
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Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 11 ENGLISH
If you suspect that your ROKSAN Platinum power amplifier is not operating properly, you should check all
the connections carefully. Phono plugs and XLR connectors should be fully inserted- a frequent cause of
problems is that connectors do not make proper contact. Below are some commonly encountered problems with
suggestions for possible cure. The list is not exhaustive: If you have any unresolved problems, please consult
your appointed ROKSAN dealer or distributor.
SYMPTOM LIKELY CAUSE SUGGESTED REMEDY
No power AC Mains lead not inserted properly
Unit not switched on on the front panel
IEC mains inlet fuses blown
Ensure AC Mains lead is fully inserted
Switch unit on from the power button
Replace with identical fuse type and
rating and try again (only once)
No output on one or both
channels
Very low sound output
Amplifier in stand-by mode (MODE
lights GREEN)
Missing or bad input signal connection
Input switch incorrectly set
Missing or bad speaker connection
Preamplifier set in MUTE position
Check music is playing
Check all input connections
Check & set Input switch (RCA or XLR)
Check all speaker connections
Deselect MUTE (check volume setting
first) on Preamplifier
Hum from speakers Incorrect Grounding
Poor choice of interconnect cables
Check Mains polarity and grounding on
all connected equipment
Change the interconnect cables
There are no user-serviceable parts inside your Platinum power amplifier. If a fault should develop, refer any
servicing to your appointed ROKSAN dealer, distributor or approved service agent.
Your ROKSAN Platinum power amplifier is guaranteed against any defect in materials and workmanship for
a period of two years from the date of purchase.
This guarantee only becomes effective if the warranty card is validated by the ROKSAN retailer from whom the
equipment was purchased and returned to ROKSAN within 28 days of purchase.
This guarantee excludes:
1. Damage caused due to accident, missuse, neglect and incorrect installation, adjustment or repair.
2. Liability for damage or loss during transit from the retailer or purchaser to ROKSAN or its authorised
distributor for the purposes of repair or inspection.
Carriage costs to ROKSAN shall be borne by the consignor.
All claims under this guarantee must be made through an authorised ROKSAN retailer.
If equipment returned for repair to ROKSAN is found on inspection to comply with the product specification
ROKSAN reserves the right to make a charge for examination and return carriage.
Unauthorised servicing will void this guarantee.
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Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 12 ENGLISH
Inputs L& R(Switch-able RCA, MUTE, XLR Balanced)
Input Impedance 38 kΩ
Input Sensitivity 700mV RMS
Power Outputs L& RLoudspeaker Binding Posts x2/Channel
Output Power 130 Watts, into 8Ω
260 Watts, into 4Ω
420 Watts, into 2Ω
Power Supply 1kVA Ultra Low Noise Power Toroidal Transformer
x3 Toroidal Transformers for Logic, Relay and Balanced inputs
Current Output >80 Amps Peak to Peak Transient
Damping Factor >440 (8Ω) Up to 30kHz
Frequency response -3dB, <2Hz – >100kHz
Gain 30.7dB
Harmonic Distortion <0.001% 1kHz, 0.008% 20kHz 10W - 8Ω
0.002% 1kHz, 0.02% 20kHz 100W - 8Ω
Signal to Noise Ratio >116dB (ref 100W, 8Ω)
Power Source 100V – 120V 50Hz / 60Hz
220V – 240V 50Hz / 60Hz
(via 10A Mains inlet filter)
Power Consumption < 1300 W
Dimension 432 x 400 x 190 (W x D x H) mm
432 x 330 x 210 (including feet)
Weigth 30 Kg
Platinum Stereo Power Amplifier
Purchase Date
ROKSAN Retailer
Please keep a record for future reference
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Serial Number
Year Month Day
Name
Location

Roksan Audio ltd Platinum Stereo Power Amplifier User Manual
CLASSIFICATION: General Use Version 1.03
All specifications are liable to change without notice. E&OE Page 13 ENGLISH
www.roksan.co.uk