Astin Trew AT2-2100 User manual

Astin Trew AT2-2100 integrated amplier
YOUR PERSONAL USER GUIDE

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AT2-2100 V1.0/17.01.2018
Your Product Serial No
Date Purchased
Dealership Purchased From
Contents Section
1. Introduction to the Astin Trew AT2-2100 Integrated Amplier 3
2. Brief product overview 3
3. Getting started, Unpacking, location and power/signal connections 5
4. Front fascia and rear panel illustrations 7
5. Remote control Illustration 7
6. Product Specications 8
7. Troubleshooting 8
8. Guarantee 9
9. CE, RoHS and WEEE 10
10. Contact 10
11. Customer Notes 11
Description Page No
All specications are liable to change without notice. E&OE

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1. Introduction to the Astin Trew
AT2-2100 Integrated Amplier
Thank you for purchasing the Astin Trew AT2-2100, a multi-input home audio
integrated amplier. The AT2-2100 is a world class audio product, designed to oer
very high quality audio amplication from analogue line level inputs (RCA and XLR
type), to your loudspeakers.
It has been designed to oer you musical enjoyment, our design philosophy at Astin
Trew is and will always be ‘true to the source’ and by that we mean that our audio
products oer a faithful and musically engaging insight into the music, will oer you
a musical performance – not a ‘hi-’ sound.
Please read this manual carefully and you will gain an understanding of the potential
of this amplier, which will reward you with a lifetime of listening pleasure Trew
philosophy, summed up in our tag line ‘true to the source’.
2. Brief product overview
It is relatively easy to design an amplier with very impressive specications, but our
listening tests over the years show us that, important as they are, there is so much
more to an amplier design than specications for true musicality.
Here are some of the ways we have achieved this:
Electronic Components in the signal path: All chosen for their inherent sound
performance qualities.
Power supplies: One of the critical areas of any quality audio equipment.
The AT2-2100 has dual mono power supplies from two audio quality 160VA
transformers, each supplying 16,000uf capacitance storage on each channel, and
separate dual mono power supplies for the pre-amplier. Individual stages ensure a
clean supply, lowest noise and isolation between circuits and incoming power supply.
The design incorporates excellent EMI/RFI (Electromagnetic and radio frequency
interference) rejection to prevent this now ever present form of audible ‘noise’ from
entering the amplied signal path.
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Input switching: Is through high quality sealed gold plated relays, reducing signal
pathways and oering the best long term switching solution.
Pre-amplier circuit(s): A hybrid design, the active circuit is run substantially
in ‘class A’ to eliminate crossover distortion at low levels, and a front end audio
transformer stage ensures galvanic isolation for very low noise and EMI/RFI isolation.
• There are two pre-amplier settings, when powered up, the ‘normal’
setting is activated and this oers a neutral balance. A fascia
mounted switch AT-1 oers a slightly warmer sound quality that
improves some musical material, and can also help ‘correct’ overly
bright or analytical loudspeakers. Do try both and see which you
prefer in your home system or with particular source materials.
Volume control: A ladder resistor network specially developed for high end
audio products is employed. Extensive audio comparisons between the ‘usual’
potentiometer and resistor networks used in high quality audio products against
our solution proved to us that this is a critical element in amplier design and often
overlooked.
Power amplier circuit: Based on our own MOSFET design (patent applied for),
an all discrete complimentary circuit oering 90W/8 Ohms. Running partly in class
A to remove crossover distortion that tends to mask the musical micro-details that
make music replay convincing. The heatsinks do get very warm in use. Please refer to
section 3 ‘getting started’ regarding correct placement of this amplier when in use.
Mechanical design: The fascia is manufactured from aluminium and milled to form
the unique design. The aluminium fascia is then shot blasted, deep etched and
anodised for a high quality durable nish. The casework and chassis are formed from
mild steel and wet painted. The supporting feet are designed to oer isolation from
vibration.
Packaging for transit: The AT2-2100 is boxed with a foam inner to protect it from
all but the worst abuse during third party transit. Your local Dealer will ensure your
amplier arrives in perfect condition.
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3. Getting started, Unpacking, location
and power/signal connections
Be careful when unpacking, do not use a long-bladed knife to cut through the box
sealing tape, and keep the packing for any future transportation. In the box, you
will nd a mains cable to suit your country, a remote control unit and batteries, the
operation manual; and the AT2-2100 in its protective bag.
Position for use: The AT2-2100 casework does become warm to the touch in
normal operation. It is therefore essential that the unit has adequate ventilation
around it, a minimum of 50mm open ventilation all round. Do not place on a carpet
or any surface that will reduce ventilation through slots in the base chassis. Do not
place in direct sunlight or directly above or near other hot equipment or heaters, or
place in an enclosed air space such as a cupboard. If it does overheat, it will turn o
automatically. Once cooled down, it will re-set and start again.
Do not site near or below any liquids that could spill onto your AT2-2100. If any
liquids do come in contact with the unit, turn the mains power o at the wall switch
immediately and pull plug out of the wall socket, as there is serious potential for
electric shock or re hazard. In the unfortunate event of liquid ingress, take the AT2-
2100 to your Dealer for inspection and he can advise on any further action required.
Position the AT2-2100 for use on a smooth and at surface. Placing on a specialist
audio isolation stand or shelf may well bring further benets to the sound qualities
achievable, some experimentation is recommended.
Connecting your AT2-2100: Before connecting any inputs/outputs, it is good
practice to switch o all associated equipment that will be connected to the unit.
There are 6 input (L/R pair) connections – all six can be connected at the same time,
but only one will be selected at any time from the six selection switches on the left-
hand side of the front fascia or your remote control, shown as inputs 1,2,3,4,5 and 6.
Inputs 1-5 are RCA input connections; input 6 is an XLR balanced signal input.
Outputs: There is one RCA (L/R pair) pre-amplier output, it is volume controlled.
A ‘mono-summed’ RCA active sub output, oering the correct impedance to optimise
any active sub-bass input.
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A ¼” jack-plug headphone output on the front fascia. Inserting this jack plug will
automatically mute the loudspeaker outputs.
The Loudspeaker output terminals (L/R pairs) will accept banana plugs, spade end
connectors or bare wires.
Power / signal connections and use: Position your AT2-2100 where it will be used,
ensuring you have adequate room to make connections at the rear, or move the
amplier and/or stand so you have access.
Power supply: Plug in the mains cable supplied but do not switch on at the wall or
the AT-2100 just yet.
Inputs and outputs: Connect the RCA/XLR input cables from your source
components and loudspeaker cables.
Turn mains power on: Push in the central power on/o switch and the switch will
illuminate. After a 10 second time-delay switch has gone live your AT2-2100 amplier
will be operational.
Switch to the input-option required: From the left-hand side push switches or
remote control, the option button chosen will be illuminated.
Volume setting: from the rotary control knob on the right side of the front fascia, or
remote controller. The LED indicator around the know oers you a visual indication of
volume setting.
Assuming you have switched on all other associated equipment, you can now play
music through your AT2-2100 amplier.
‘Warm’ option setting: switch AT-1 can be switched ‘on the y’ to assess whether it
is required or not. This is entirely subjective.
Fault condition warning light: The mute switch illumination will ash on and o
if the amplier has identied a fault condition or too low a voltage supplied to the
unit, and the loudspeaker protection circuit will be activated (see section ‘Trouble
shooting’ also).
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4. Front fascia and rear panel illustrations
Front fascia Rear panel
1 5 x RCA input switches 1 Loudspeaker connection, Right channel
2 Mute switch + fault condition indicator 2 1 pair XLR input connections
3 XLR input switch 3 5 pairs RCA input connections
4 Headphone output socket 4 1 pair RCA pre-amplier output
5 ON/OFF mains power switch 5 1 x RCA mono sub bass output
6 ‘Warm’ output pre-amplier 6 IEC mains power input socket
7 LED visual volume level indication 7 Mains fuse holder.
8 Volume control knob 8 Loudspeaker connection, Left channel
5. Remote control Illustration
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1 2 3 4 5 6 7 8

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6. Product Specications
Make and Model Astin Trew AT2-2100
General Description Two channel integrated amplier
Mains voltage input 230VAC (50 ~ 60Hz) / Voltage range: 220--240VAC
Inputs, line level 5 x RCA, 1 x XLR
Input impedance 47K ohm
Outputs Speakers x 1, pre-amplier x 1, sub-bass x 1, headphone jack x 1
Output power 90W (8 ohm) / 135W (4 ohm)
Damping factor 60 (8 ohm)
Frequency response +0.1 / - 3dB @ <10Hz - >140KHz (10W/8ohms output)
Distortion (1W) 0.002 @ 1W/8ohms 20Hz...20KHz
volume control @ 20dB overall gain
Distortion (80W) <0.01% @ 80W/8ohms 20Hz...20KHz
volume control @20dB overall gain
Hum + noise >104dB below full output, volume control
@20dB overall gain
Power source 220V – 240V 50Hz / 60Hz
Power source standby – 50W
Dimension (W x D x Ht. o/a) 430mm x 102mm x 410mm
Colour options Silver and Black (special colours to order)
Weight (unboxed) 11.6Kg
Boxed dimensions (W x D x Ht.) 550mm x 500mm x 200mm
Gross weight (boxed) 13Kg (inc. accessory items)
7. Troubleshooting
Your Astin Trew AT2-2100 should give you many years of trouble free musical
pleasure. However, if it does not seem to be working properly, please ensure you
have tried these ‘simple’ tests before you contact your Dealer for further advice. 99%
of problems tend to be simple to rectify.
Check the power chord is connected and the power switch is illuminated when you
switch on.
1. Check all input and output signal cables are fully inserted at both ends.
2. Ensure the input selection is switched to your desired input.
3. Ensure your ancillary equipment is working correctly.
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More specically:
No power to the amplier: Check the power cord fuse (UK) and AT2-2100 Mains input fuse.
Poor speaker imaging, low bass output: Check the loudspeaker wiring is not connected
out of phase.
No sound output. Check the mute is not switched on.
Remote control not working: Check the remote control batteries.
Hum from speakers: Incorrect grounding, check Mains polarity and grounding on all
connected equipment.
Illuminated mute switch is ashing on and o – turn o the amplier, count 10 and switch
on again. If the mute switch illumination is still ashing, this may indicate there is either:
(A) too low a mains voltage input, check to see if it is above 200VAC
(B) a fault with one of the loudspeakers or loudspeaker
cable, shorting the +- outputs.
(C) a fault occurrence within the amplier.
If in doubt, talk to the Dealer who sold you the amplier for advice.
8. Guarantee
A two-year guarantee is given and is valid from the purchase date of your new Astin
Trew AT2-2100.
This is in respect of any defect in materials or workmanship and you will need to
retain your receipt as proof of purchase. Each Astin Trew product has its own unique
serial number and this is held both at the Dealer who has sold you the goods and at
Astin Trew. All claims should be made through the Dealer who sold you the goods
who will inspect them rst to assess the problem.
The two year guarantee excludes:
A. All damage caused by accident, misuse, neglect, incorrect installation or
adjustment, non-authorised repairs, servicing or component replacements.
B. Liability for damage or loss in transit from the Dealer or the
purchaser back to Astin Trew or their authorised local service
agent for the purposes of inspection, repair or replacement.
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Carriage costs to Astin Trew or their authorised repair Agent shall be borne by the
consignor.
If the returned equipment is found not to be faulty in respect of any defect in
materials or workmanship, Astin Trew and their Agents reserve the right to make a
charge for both the examination of the goods and return carriage.
In the event of a product failure, neither Astin Trew Ltd. or its Distributor or Dealer/
re-seller shall be liable for any injury, loss or damage caused to property or products
other than the product under guarantee.
This guarantee does not aect your consumer rights under English law.
9. CE, RoHS and WEEE
All Astin Trew products comply with CE regulations, the RoHS Directive (EU) and is
designed to comply with the legal provisions of EU directives 89/3336/EC and 72/23/EC.
All Astin Trew products should be disposed of after use in accordance with the WEEE
Directive (EU).
10. Contact
Please refer to your Dealer for all after sales, and accessories, we only sell through
Dealers who are competent and understand our products.
Astin Trew can be contacted via our web site on www.astintrew.co.uk. If you wish
to tell us about your user experience with the AT2-2100 or about the Dealer service
you experienced, we would like to hear from you. Email: [e-mail]
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11. Customer Notes
AT2-2100 V1.0/17.01.2018

E-mail: [email protected] | Website: www.astintrew.co.uk
Astin Trew, Bills Park, Wallis, Haverfordwest, SA62 5RA, UK