PIONEER A-20-K 50W Stereo Amplifier with Direct Energy Design and Aluminium Panels (Black) 3 Years waranty

Main Features

Output Power per Channel50W
Impedance at Output Level• 4 Ω - 16 Ω (A / B)
• 8 Ω - 32 Ω (A + B)
• 4 Ω - 16 Ω (Bi-wiring)
Number of Channels2
Input Connections• SACD/CD
• Phono (MM)
• Aux
• Network
• Recorder
• Tuner
Output Connections• Recorder
• Phones
Remote ControlYes
Input & Output connections
HeadphoneYes
Large speaker terminalsYes
Phono InputYes
Speaker A/BYes
Audio Features
Bass/Treble Tone ControlsYes
'DIRECT' SwitchYes
Loudness (+)Yes
MutingYes
Source DirectYes
Power Output
Power output per channel50 W
Condition20 Hz - 20 kHz, 4Ω, 0.1 % КНИ
Rated Power Output50 W per channel
Power RequirementsAC 220 - 230 В / 50 Гц
Power Consumption (in use / standby)135 W / 0.30 W
Auto Power DownYes

Construction
Direct Construction (+)Yes
Design- Direct Energy Design Amp
- Symmetrical Power Amp
- Clean Ground Construction
- Isolated Power Supply
- Source Direct Mode
- Trans-Stabiliser
- Speaker A, B, A+B Selector
- Aluminium Panels
- Auto Power Down
Amplifier Specifications
Dimensions (W x H x D)435 x 128 x 360  mm
Weight7.2 kg

Τi 60 tube
Integrated tube amp.Four line inputs.
2X12AU7, 4x EL34, 1x12AX7
35 Wrms per chan.4-8 ohm.
Class AB push-pull
Remote control included.

Choosing the DAC

Both our CXA60 and CXA80 amplifiers employ the same Wolfson WM8740 DAC, and thereʼs a very good reason for that: it sounds superb! There are more recent Wolfson DACs in circulation, however none sound quite as great as the WM8740 in our view. Which is why, time and again, we choose them.

The CXA80 utilises two separate windings on the oversize toroidal transformer. In effect, this is like having two toroidal transformers wound onto one chassis, providing separate windings for each amplification module. If you get a huge transient in the right channel, it wonʼt unsettle whatʼs going on in the left. The current is being drawn from a different path, rather than a common path, so the output is stable and remains unflustered, whether your liking is for Little Richard or Lamb of God.

The transistors used by the CXA80 are not your usual common or garden offerings. They come with an integrated Dynamic Thermal Tracking System. So what does this mean? Normally a Power Output transistor utilises a thermo-coupler attached directly to the heat sink of the amp; this informs the system so that it can rebias when key temperatures are reached. However, using Integrated Dynamic Thermal tracking provides a far more accurate reading of the real temperature of a transistor, and relays it faster too because itʼs not a delayed heating effect. This enables us to bias the amplifier more accurately and in almost real time. Which means your CXA80 is always running at optimum performance.

If you want to use a subwoofer as part of your speaker complement, the CXA80 doesnʼt penalise you for it. Because we want to ensure thereʼs no unnecessary high frequency noise affecting the subwoofer, weʼve put the output filter at 3KHz. This is high enough to prevent any phase shift associated with the low pass filter affecting what happens below 200Hz. The result is a phase linear subwoofer output signal which is clean and musical.

The CX range represents a step change in the way our engineers have approached signal path design, and the result is one of our most musical and entertaining amplifiers yet.

Previously, we went to almost surgical lengths to minimise distortion in order to get the best results. This invariably meant 46 components sat in the signal path. For the CX Series, we wanted to dramatically reduce that component count. The CXA80 now has only 24 components in the signal path. The big difference is that there are now 500 support components as well. Their job is to guarantee those 24 key components are absolutely optimal all the time, regardless of mains fluctuations and other influences.

This has made a big difference when it comes to tuning. Previously, tweaking one of the 46 components only made a small difference and it was sometimes difficult to quantify exactly what difference any change made. With the CX series, those 24 components have now actually become quite critical. Changing just one affects the character of the amplifier.We can hear very clearly what each of those components is doing.

This revision has fundamentally changed the character of the amplifier. Listening to a CX series amplifier is fun, engaging and exciting.

In order to offer 24-bit 192kHz resolution via asynchronous USB we use a specialist XMOS device dedicated to the USB input. Weʼve also written a custom driver to allow PC users to access the higher sample rates available in USB Audio 2 mode. This bespoke code allows us to stream audio files at the highest possible resolution.

If you want to use your CXA80 with a Bluetooth source, we offer an optional BT100 audio receiver. To ensure that this does not interfere with other components in the amplifier, itʼs isolated internally on the digital input board. From the ground up, this is an audiophile Bluetooth device. All the coding for the BT100, including the aptX implementation, is done in-house. We even include an extension cable which enables you get the best Bluetooth range.

Sometimes thereʼs a good reason to keep things uncomplicated. The CXA80 features a high-quality damped metal chassis, designed to ensure that nothing rattles or interferes with the electronics. Weʼve also kept volume control simple. The CXA80 uses a logarithmic ALPS pot. And when it comes to switching inputs, the CXA80 uses relay switching with silver plated contacts. This classic approach is still the best way to move signals around, rather than with transistors or electronic switches.

• Power output:80W RMS into 8 Ohms, 120W RMS into 4 Ohms
• DAC:Wolfson WM8740
• Frequency Response:

• Yamaha high sound quality, created by rich experience and tradition, and high technological expertise
• Pure Direct Mode for greater sound purity
• Simple and sophisticated design
• Phono MM terminal for vinyl playback
• Screw-type speaker terminals
• Speaker selector and speaker terminals for two systems
• Simple design remote control
• Head phone terminal

 MANUAL/ΕΓΧΕΙΡΙΔΙΟ

Equipped with wireless technologies WiFi and Bluetooth, the Network AV Receiver 7.2ch AVR-X3100W lets you listen to your favorite tracks from your portable audio player, smartphone and tablet, as though from your home network. Choose from a variety of internet radio stations and listen to your favorite tracks from music streaming services like Spotify. You can also listen to songs from DLNA PC or Mac. The AVR-X3100W is equipped with two RF antennas for optimal quality receiving Bluetooth and WiFi.

The advanced video processor AVR-X3100W can treat future 4K Ultra HD 60 Hz full rate content and features 4: 4: 4 Pure Color 4K sub-sampling pass-through, features the specifications of the latest HDMI. The AVR-X3100Weinai also certified by the Imaging Science Foundation for video quality and is equipped with a full suite of advanced video ISFccc calibration checks.

The part of the powerful 7-channel amp has a final design support multiple high-power output devices on all channels. With 180 watts per channel, the AVR-X3100W can also lead loads of low impedance, up to 4 ohms. Our new Eco Mode allows reducing the overall energy consumption and has Eco Meter on the screen, allowing you to see graphically the reduction of energy consumption in real time.

With the Gold suite of Audyssey audio processing DSP algorithms, the AVR-X3100W features Audyssey MultEQ XT automatic metering and correction of room acoustics, along with Audyssey Dynamic Volume and Audyssey Dynamic EQ. The Audyssey DSX (Dynamic Surround Expansion) gives you the option of adding more front speakers or front wide-angle speaker.


8 Inputs HDMI, 2 HDMI Outputs
Equipped with not fewer than 8 inputs HDMI, the AVR-X3100W has 7 HDMI inputs on the back panel, along with another HDMI input on the front panel, allowing you to easily connect your favorite gaming console, HDTV camcorder or other HDMI device. The 2 HDMI outputs support various program sources, so you can enjoy surround movie in the main room and a separate stereo program with video from a different source in a second room.

Built-in Bluetooth, Built-in Wi-Fi and AirPlay, DLNA
Many portable devices are equipped with Bluetooth wireless connectivity, and integrated Bluetooth wireless connectivity AVR-X3100W allows you to make streaming of your favorite audio tracks from up to 8 Bluetooth devices such as smartphones, portable audio players and tablets. With integrated Wi-Fi wireless technology, your AVR-X3100W connected to the Internet through your home network, opening a world of music from Internet radio stations, as well as in streaming Spotify subscription service through the last scene Association Spotify. With AirPlay, you can enjoy listening to your favorite tracks wirelessly from your portable iOS device, including iPhone, iPod touch and iPad. Certification DLNA 1.5 allows you to connect to a PC or Mac via your home wireless network for additional features streaming. Our Denon Remote App lets you easily check the AVR-X3100W with your favorite portable device and is available for Apple and Android devices and the Kindle Fire.

Easy to Install, Easy to Use
Exclusive Installation Guide Denon, together with our Introductory Handbook, ensures proper connection of your system easy and quick configuration, so you can enjoy perfect surround sound home theater system with minimum disruption and difficulty. The Installation Guide has sharp graphics and text, guiding you quickly and easily in the installation process, optimizing critical system settings for the best possible sound quality.

Powerful Amplifier 7-Channel Discrete Reinforcement Layout with Eco Mode
With maximum power channels of 180 watts each, the AVR-X3100W final design features support multiple high-current output devices with identical circuit topology for all seven channels. Our new Eco Mode allows reducing the overall energy consumption and has Eco Meter on the screen, allowing you to see graphically the reduction of energy consumption. The Auto Eco mode automatically switches between normal energy consumption and Eco modes, depending on the selected volume level. The final portion of aid may lead loads low-impedance until the 4 ohms, for compatibility and stability with almost any speaker model.

Built Audyssey MultEQ XT
The AVR-X3100W has the Silver family of DSP technologies Audyssey, including MultEQ room acoustic measurement and correction. Through the supplied measurement microphone, the MultEQ system first measures the actual response inside the room from all the speakers including the subwoofer, and then create multiple high precision digital filters that ensure smoothest response. The AVR-X3100W also has the option of Audyssey MultEQ Pro.

Top audio formats
The advanced audio decoding section includes recent high-resolution non-losses decoders, including Dolby TrueHD and DTS-HD Master Audio. There are also three additional audio decoding options to extend the front or on the sound stage, termed Dolby Pro Logic IIz, DTS Neo: X and Audyssey DSX.

2 Outputs Subwoofer
Depending on the position the subwoofer in the listening room at the listening position, the quality of deep bass can be adversely affected by reverberations inside the room, with sharp peaks and wells which, together, produce muffled bass and fuzzy bass details . Equipped with 2 subwoofer outputs, the AVR-X3100W lets you use 2 subwoofers, arranged in different positions in the listening room. Having subsse two different positions in the room, the quality of bass can often be significantly better thanks to the resultant response with smoother, deeper bass free from annoying steep peaks and dips.