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TX-8255_EU.qxd 08.7.30 11:56 AM Page 1
TX-8255
Stereo Receiver
SILVER BLACK
Honouring the Fundamentals of Pure Stereo Sound
If you want your receiver to focus purely on two-channel audio, the TX-8255 could be just the answer. It’s perfect for your living room, or anywhere else you like to sit back and soak up your music.The TX-8255’s rock-solid construction incorporates a heavy-duty extruded aluminum heat sink to ensure cooler operation.The whole unit is housed in a rigid, reinforced chassis—finished off with a hairline-brushed aluminum front panel—to help eliminate vibrations. Add compatibility with RI dock for the iPod, and you have a superb stereo solution that brings out the power and dynamism of your audio sources.
WRAT (Wide Range Amplifier Technology)
The TX-8255 incorporates WRAT, an amalgam of proprietary Onkyo technologies that ensure optimal audio performance. WRAT delivers three main audio benefits:
(1) Low Negative-Feedback Design to Handle Program Peaks
Negative feedback (NFB) is a cheap way of reducing noise at lower frequencies, but it comes with a couple of drawbacks. For a start, NFB inhibits the amplifier’s ability to respond to large signal gains, such as orchestral crescendos. And secondly, NFB interferes with the reproduction of high frequencies.To counter these problems, the
TX-8255 uses minimal negative feedback and incorporates audiophilegrade, close-tolerance components at critical points in the signal path.
This helps it to achieve a frequency response out to 100 kHz for highresolution audio and standard-definition music sources.
(2) Closed Ground-Loop Circuits to Minimise Distortion at High Volumes
Noise results when an amplifier’s ground potential (i.e. voltage) fluctuates during playback. In an open-loop circuit design, where all circuits are connected to the power supply via a single loop (as on many amplifiers), noise increases cumulatively.The TX-8255 deals with this issue by using a closed-circuit design in which each circuit has its own separate loop connecting it to the power supply.This prevents the compounding of circuit noise, thus keeping the ground potential free of distortion.
(3) High Instantaneous-Current Capability for More Dynamic Audio
When an amplifier outputs an audio signal, the speaker absorbs energy, reflexes, and sends energy back to the amplifier, which must then, in turn, cancel this energy and be ready to instantaneously send out the next signal.To perform this successfully, an amplifier requires a high instantaneous-current capability.The same capability is needed to handle speaker impedance fluctuations, which can force an amplifier to provide four to six times its usual current load. With this in mind, the
TX-8255 has been designed to ensure audio output remains unaffected by power limitations.
High-Current, Low-Impedance Drive
A receiver’s ability to deliver increased power output into low impedances is a vital element in its overall performance. If the current flow to your loudspeakers is inconsistent, audio output will be compromised. When compounded by inferior parts and design, the sound can distort on musical peaks; the bass can lose impact; the dynamic range can become cramped; the musical timbre can harden; or the soundstage can collapse.Thanks to its discrete output stage and highly capable power transformer, the TX-8255 can drive any number of speakers.
Speaker Playback and Remote Control* for Another
Room
With speaker A/B selectors and dedicated speaker terminals, the
TX-8255 can be set up to send audio to a second room.The TX-8255 also features IR connectivity, so you can still control it even if it is concealed inside a cabinet or if you’re in the adjoining room (where the second set of speakers are placed).
*This operation requires purchase of a multi-room distribution and control system, such as one provided by Niles or Xantech.
iPod Compatibility via Onkyo’s RI (Remote Interactive)
System
RI capability enables you to connect other Onkyo components to the
TX-8255 and operate them all via a single remote controller. It also makes it possible to integrate an iPod with the TX-8255 through one of Onkyo’s specially designed RI docks for the iPod*.These docks deliver a more full-bodied and detailed sound than can be achieved by a direct connection. While ensuring that your personal iTunes collection is delivered to the stereo system with as much fidelity as possible, the
RI dock also serves to recharge your iPod’s battery.
*RI dock not included.
TX-8255_EU.qxd 08.7.30 11:56 AM Page 2
TX-8255
Stereo Receiver
AMPLIFIER AND CONNECTIVITY
FEATURES
• 90 W/Ch, 4
Ω
, 1 kHz, IEC (1 Channel Driven)
• WRAT (Wide Range Amplifier Technology)
• High-Current, Low-Impedance Drive
• Discrete Output Stage Circuitry
• 5 Audio Inputs (CD,Tape 1,Tape 2, Line 1/DVD, Line
2) and 2 Outputs
• Phono Input
• Massive Power Transformer
• Heavy-Duty Extruded Heat Sink for Maximum Heat
Dissipation
• Speaker A/B Drive
• IR Input/Output
• Independent Treble, Bass, and Balance Control
TUNER FEATURES
• 40 FM/AM Random Presets
• Direct Access Tuning with 10 Key Buttons
• RDS (PS/PTY/RT/TP)
OTHER FEATURES
• Newly Designed Brushed Hairline Aluminum Front
Panel
• Headphone Jack
• Audio Mute (via Remote)
• 3-Mode Display Dimmer (Dim/Dark/Normal)
• Sleep Timer (via Remote)
• Battery-Free Memory Back-up
• Non-Resonant Feet
• Compatible with RI Dock for the iPod
• Banana Plug-Compatible Speaker Posts
• RI (Remote Interactive) Remote Control
SPECIFICATIONS
A MPLIFIER S ECTION
Power Output
Dynamic Power
90 W + 90 W (4
Ω
, 1 kHz, 1 channel driven,
IEC)
110 W + 110 W (2
Ω
)
90 W + 90 W (4
Ω
)
55 W + 55 W (8
Ω
)
THD (Total Harmonic Distortion)
Damping Factor
0.08% (Rated power)
60 (1 kHz, 8
Ω
)
Input Sensitivity and Impedance
Line 150 mV/50 k
Ω
Phono MM 2.5 mV/50 k
Ω
Output Level and Impedance
Rec out 150 mV/2.2 k
Ω
Phono Overload 120 mV (MM, 1 kHz, 0.5%)
Frequency Response
Tone Control
10 Hz–100 kHz (+1 dB, -3 dB)
±10 dB, 100 Hz (Bass)
±10 dB, 10 kHz (Treble)
Signal-to-Noise Ratio
Line
Phono MM
Speaker Impedance
100 dB (IHF-A)
80 dB (IHF-A)
4
Ω
–16
Ω
, 8
Ω
–16
Ω
T
UNER
S
ECTION
[FM]
Tuning Frequency Range 87.5 MHz–108 MHz
[AM]
Tuning Frequency Range 522 kHz–1611 kHz
G ENERAL
Power Supply
Power Consumption
AC 230–240 V
∼
, 50 Hz
180 W
Standby Power Consumption
0.3 W
Dimensions (W x H x D) 435 x 149 x 340 mm
Weight 7.5 kg
■ CARTON
Dimensions (W x H x D) 560 x 250 x 419 mm
Weight 9.5 kg
Due to a policy of continuous product improvement, Onkyo reserves the right to change specifications and appearance without notice. iPod is a trademark of Apple Computer, Inc., registered in the U.S. and other countries. All other trademarks and registered trademarks are the property of their respective holders.
Onkyo Corporation 2-1 Nisshin-cho, Neyagawa-shi, Osaka 572-8540, JAPAN Tel: +81-72-831-8136 Fax: +81-72-833-5222 http://www.onkyo.com/
Onkyo Europe Electronics GmbH Liegnitzerstrasse 6, 82194 Grobenzell, GERMANY Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/
Onkyo UK Office Suite 1 Gregories Court, Gregories Road, Beaconsfield, Buckinghamshire HP9 1HQ, UNITED KINGDOM Tel: +44(0)1494-681515 Fax: +44(0)1494-680452 http://www.onkyo.co.uk
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