The Onkyo Icon A-50 arrives at an interesting moment for the integrated amplifier category. The traditional integrated amp has long been the pragmatic heart of a two channel system, but the modern listener increasingly wants that heart to also speak the language of streaming, network audio, and legacy digital sources without a rack full of outboard boxes. The A-50, part of the revived Onkyo Icon series, is a streaming integrated amplifier built around exactly that convergence. It combines a conventional analog preamp and power amp stage with a built-in digital-to-analog converter and a full network streaming platform.
For the experienced enthusiast, the interesting questions are not whether it streams, but how the signal path is arranged, how sources are handled, and how it fits into an existing system. Let us work through the architecture and, importantly, the exact connectivity, because system integration lives and dies on which connectors are actually present.
Core Amplifier Topology and Power
What kind of amplifier is the Icon A-50 at its core?
The Icon A-50 is a streaming integrated amplifier, meaning it houses a preamplifier stage, a power amplifier stage, and a network streaming engine within a single chassis. An integrated design consolidates the input selection, volume control, and gain stages that would otherwise be split between a separate preamp and power amp. The advantage for the enthusiast is a shorter, controlled signal path with a single, coherent power supply feeding the whole audio chain, and the elimination of an extra set of interconnects between preamp and power amp. The tradeoff, historically, is the sharing of one chassis and one power supply across noisy digital circuitry and sensitive analog stages, which is why the internal layout and power supply design matter so much in a device like this.
How does the built-in DAC fit into the signal path?
The Icon A-50 includes a built-in digital-to-analog converter that handles every digital source before it reaches the analog preamp and power stages. Any signal arriving over the network, over Bluetooth, or through one of the physical digital inputs is decoded and converted to analog inside the unit, then handed to the same volume control and amplification path used by the analog inputs. This is significant because it means the DAC is not an afterthought bolted onto an analog amp; it is a first class citizen of the design. For the listener, it means you can run a purely digital system, a purely analog system, or a hybrid, and everything is ultimately reconciled to one internal reference point before amplification.
Network Streaming and Wireless Integration
Which streaming services are supported natively?
The Icon A-50 supports Spotify, TIDAL, and Amazon Music natively. Native support means these services are integrated at the platform level rather than being merely cast from a phone, so the amplifier itself becomes the endpoint pulling the stream. In practice this reduces reliance on a phone staying awake and connected, and it generally allows for gapless playback and better metadata handling than a simple relayed connection.
What streaming platforms and control methods does it use?
The A-50 uses the Onkyo Controller app, Chromecast built-in, AirPlay 2, and DTS Play-Fi as its streaming platforms. Each of these represents a different ecosystem for getting audio into the amplifier. The Onkyo Controller app acts as the central hub for setup and browsing supported services. Chromecast built-in lets Android and Chrome based apps cast directly to the unit. AirPlay 2 provides the equivalent for the Apple ecosystem and allows the A-50 to participate in a multiroom AirPlay setup. DTS Play-Fi adds another multiroom and casting framework with wide app support. The practical benefit of carrying all four is that almost any device in a mixed household can find a route to the amplifier without a compatibility argument.
How does the A-50 connect to a network?
The Icon A-50 connects using both Wi-Fi and Ethernet. Wi-Fi offers placement flexibility for systems where running a cable is impractical, while the Ethernet port provides a wired connection that many enthusiasts prefer for high resolution streaming because it removes wireless congestion and jitter concerns from the equation. Having both means you can start on Wi-Fi during setup and move to a hardwired link later, or use Ethernet as the primary path and keep Wi-Fi available as a fallback.
Does the Icon A-50 support Bluetooth?
Yes, the A-50 includes Bluetooth. Bluetooth is the lowest friction way to get audio from a phone, tablet, or laptop into the system, useful for guests or for casual listening from apps that do not support the higher quality streaming platforms. While it does not carry the same fidelity ceiling as a networked stream, its universality makes it a valuable convenience input that requires no shared network and no app login.
Analog Inputs and the Phono Stage
What analog inputs does the A-50 provide?
The Icon A-50 offers three RCA line level inputs plus a switchable moving magnet and moving coil phono input. The three line level RCA inputs accommodate the usual stable of analog sources such as a CD player, a tuner, or a tape or auxiliary device. Each of these expects a standard line level signal and is routed directly into the preamp stage. Three inputs is a sensible count for an amplifier that also carries a full suite of digital and network sources, since much of the source switching burden shifts to the digital domain.
How does the switchable MM/MC phono stage work?
The A-50 has a dedicated phono input that can be switched between moving magnet and moving coil cartridge types. A phono stage does two jobs: it applies a large amount of gain to the very low output of a turntable cartridge, and it applies the RIAA equalization curve that reverses the frequency shaping baked into vinyl records. Moving magnet cartridges produce a relatively higher output and need less gain, while moving coil cartridges produce a much smaller signal and require considerably more gain and different loading. Because the A-50 lets you switch between the two modes, it can properly serve both cartridge families rather than restricting you to one, which spares the enthusiast from buying an outboard phono preamp when upgrading to a low output moving coil cartridge.
Digital Inputs and HDMI
What digital inputs are available?
The Icon A-50 provides one coaxial digital input, one optical digital input, and HDMI ARC. The coaxial and optical inputs are the two classic S/PDIF interfaces. Coaxial uses a single RCA style connector and an electrical connection, while optical uses a TOSLINK connector and light, which electrically isolates the source from the amplifier and can be useful in eliminating ground loop issues. Both feed the internal DAC. Having one of each covers the common cases where a source device offers only one type.
What does HDMI ARC add to the system?
HDMI ARC, the Audio Return Channel, lets a television send its audio back to the Icon A-50 over a single HDMI cable. This is the feature that turns the amplifier into a credible hub for a television based setup, since the TV can pass through the audio from its own apps and from connected devices to the amplifier. It also typically enables basic volume linkage with the television remote, which is a meaningful convenience when the A-50 is anchoring both music and TV sound in the same room.
What is the USB-C port for?
The A-50 includes a USB-C connector. USB-C is the modern universal connector, and on an amplifier of this type it serves as a digital input path for connecting a computer or compatible source directly to the internal DAC. This gives a wired, direct digital route that bypasses the network entirely, which some listeners prefer for local library playback.
Outputs and System Expansion
What analog output does the A-50 offer?
The Icon A-50 provides an RCA preamp output. A preamp out taps the signal after the volume control but before the power amplifier stage, allowing you to send a variable level analog signal to an external device. In practice this lets you feed a separate power amplifier, a powered subwoofer, or an additional zone from the same source selection and volume control. It is the key expansion point for anyone who wants to grow beyond the internal power stage while keeping the A-50 as the system brain.
What speaker outputs are provided?
The A-50 has one pair of binding post speaker outputs. Binding posts are the more robust and flexible speaker terminal type, accepting bare wire, spades, and banana plugs, which suits the heavier gauge cabling many enthusiasts use. The single pair means the amplifier is designed to drive one stereo speaker set directly, with any additional zones or amplification handled through the preamp output rather than a second set of speaker terminals.
Is there a headphone output?
Yes, the Icon A-50 includes a headphone output. This routes the amplified or buffered signal to a headphone jack for private listening and typically mutes the speaker outputs when engaged. For an integrated amplifier that also serves as a digital hub, a headphone output extends the same source selection and DAC to a personal listening session without needing a separate headphone amplifier.
Interpreting the Design as a Whole
What does the connectivity set tell us about the intended system?
Taken together, the connectivity reveals an amplifier meant to be the single anchor of a modern two channel system that still respects legacy sources. The presence of a switchable MM/MC phono stage alongside three line inputs signals genuine analog intent, while the coaxial, optical, HDMI ARC, and USB-C inputs feeding a built-in DAC show equal seriousness about digital. The four streaming platforms and dual network connections mean the A-50 rarely leaves a source stranded, and the RCA preamp out plus single speaker binding post pair define a clear growth path: start with the internal amplification driving one speaker pair, then expand outward through the preamp out as your ambitions grow. It is a design that asks you to consolidate rather than accumulate boxes, and the exact input and output roster is arranged to make that consolidation genuinely practical.
