Marantz Grand Horizon Wireless Speaker: Features and Performance

One speaker can make a surprisingly big difference in a room; provided it has the power, drivers and connectivity to do more than background music. The Marantz Grand Horizon is built for listeners who want a statement-piece wireless speaker without filling the room with separate components.

It combines serious amplification, deep bass capability, high-resolution streaming and TV-friendly HDMI eARC in one beautifully finished enclosure. Here’s what that means in everyday listening, and who it makes the most sense for.

Built-in amplification: 

An active speaker has its amplifier inside, so there’s no separate receiver or stereo amplifier to buy and match. The Grand Horizon has 370 watts of FTC-rated amplification, meaning its power rating is measured using a standardized U.S. Federal Trade Commission test method. Its Marantz Rise amplifier uses GaN FET technology—gallium nitride transistors designed for efficient amplification—and is matched specifically to its driver array.

Driver layout and bass reach: 

Bigger bass drivers generally move more air, which matters for the weight of kick drums, bass guitar and cinematic effects. This model uses one 8-inch Marantz Gravity woofer, four 3-inch wideband drivers and three 1-inch high-frequency drivers.

Frequency response: 

This tells you how low and high a speaker can play. The Grand Horizon is rated from 28Hz to 20kHz within ±3dB, reaching well into the bass range without requiring a separate subwoofer for many music-focused rooms.

Streaming flexibility: 

Wi-Fi streaming is the best fit for whole-home audio and high-resolution listening. HEOS lets you control music and compatible speakers in multiple rooms from one app, while AirPlay 2, Bluetooth and Spotify Connect add easy options for guests and everyday playback.

TV connectivity:

HDMI eARC or ARC lets a compatible TV send its audio to the speaker through the HDMI cable. It’s the cleanest way to make a one-speaker TV setup feel more engaging, while keeping the remote routine simple.

Dolby Atmos support: 

Dolby Atmos content carries sound-placement information for a more spacious, immersive presentation. The Grand Horizon can decode Dolby Atmos, Dolby TrueHD, Dolby Digital+ and other formats; learn more about how Dolby Atmos creates a more immersive sound experience.

Room size and placement: 

More output is useful in an open-concept main floor or large living room, but placement still matters. Give the speaker a stable surface, avoid tightly enclosing it in cabinetry, and leave some breathing room around it for the best bass balance and broad soundstage.

The Marantz Grand Horizon is a flagship wireless speaker for people who want high-end sound with a much simpler setup than a traditional separates system. It combines 370 watts of FTC-rated amplification with an 8-inch bass driver, four wideband drivers and three tweeters. Marantz Mirage DSP—DSP means digital sound processing—helps create a presentation that feels larger than the cabinet itself, while the 360-degree seamless fabric finish gives it the polished look expected in a living room, not just a listening room.

It is equally at home as a dedicated music system or as the audio upgrade for a TV. Along with dual-band Wi-Fi, Ethernet, Bluetooth 5.4, AirPlay 2 and Spotify Connect, it includes RCA, optical, USB-C mass-storage playback and HDMI eARC/ARC. HEOS adds multi-room control and access to supported music services, network music libraries and high-resolution files up to 24-bit/192kHz PCM—a common digital audio format—plus DSD up to 5.6MHz, a high-resolution audio format used by some music files.

Best For: A design-conscious listener who wants bold, refined music playback and straightforward TV sound in a medium-to-large room, without adding a separate amplifier and multiple speaker cabinets.

Trade-offs: At 46.9 lb, it is a substantial single speaker that needs a permanent, sturdy spot. It can decode Dolby Atmos content, but one enclosure cannot deliver the discrete rear and overhead speaker placement of a full multi-speaker surround system.

If your TV room is also where you listen to music, the Grand Horizon makes a lot of sense. Connect it to a compatible television with HDMI eARC or ARC, then use HEOS, AirPlay 2 or Spotify Connect when it’s time for music. It’s a far more elegant route than building a component system around a TV stand when you prefer a clean, uncluttered room.

For an open-concept space

Open kitchens, great rooms and loft-style spaces can swallow up small wireless speakers. The Grand Horizon’s large woofer, maximum loudness rating of 111dB measured at one metre and 28Hz low-frequency extension give it the scale to keep music sounding full when the room gets busy. It is a much better fit for this job than a compact portable speaker.

For a dedicated music corner

Place it in a reading room, office, bedroom or lounge where you want a purposeful music system but don’t want equipment racks, speaker wire or a separate amplifier. Connect a turntable with its own phono preamp through the stereo RCA input, use optical for a digital source, or play a library from USB-C or a network-attached storage device (NAS) or other UPnP-compatible network share. UPnP is a common network standard that helps compatible devices find and play shared media.

For multi-room listening

HEOS is especially useful when you want the same playlist moving with you from room to room. The Grand Horizon can be grouped with other compatible HEOS products in the app, and two matching Grand Horizon speakers can be paired for stereo. For the most convincing left-right imaging, use two speakers of the same model rather than mixing it with a different Horizon model.

Set It Up for Better Results

• Use HDMI eARC when the TV is the main source: It gives you a simple audio path from the television and lets the speaker handle compatible TV audio formats.
• Choose Wi-Fi or Ethernet for regular streaming: Bluetooth is handy, but a network connection is the better choice for dependable multi-room playback and high-resolution music streaming.
• Give the bass room to breathe: Avoid placing the speaker deep inside a cabinet or directly against a corner. A little clearance can help keep low frequencies from becoming overly heavy.
• Match expectations to the setup: The Grand Horizon is an exceptionally capable all-in-one solution. If your priority is pinpoint effects behind and above the sofa for movies, a dedicated Dolby Atmos surround system with multiple speakers remains the better route.

Quick Comparison

The detailed specifications below are useful for comparing inputs and file support. In plain language, the Grand Horizon is a powerful all-in-one speaker with wired TV connectivity, flexible wireless streaming and support for high-resolution digital music. SPL means sound pressure level, which is the measurement used for loudness; PCM is a standard digital audio format; and DSD is a high-resolution audio format.

Feature Marantz Grand HorizonSpeaker type Flagship all-in-one wireless speakerAmplification 370W FTC-rated Marantz Rise GaN FET amplification; FTC-rated power is measured under a standardized U.S. test method, while GaN FET refers to the amplifier’s gallium nitride transistor designDriver array 1 x 8-inch bass driver, 4 x 3-inch wideband drivers, 3 x 1-inch high-frequency driversFrequency response 28Hz–20kHz (±3dB); 18Hz at -10dBMaximum output 111dB maximum SPL at 1 metre; this is its maximum loudness measurement at one metre. Peak SPL is 122dB at 1 metre.TV connection HDMI eARC / ARCOther wired inputs Stereo RCA, optical (TOSLINK, a common digital optical connection) and USB-C mass storageWireless and streaming HEOS, Wi-Fi, Ethernet, Bluetooth 5.4, AirPlay 2 and Spotify ConnectHigh-resolution support PCM, a standard digital audio format, up to 24-bit/192kHz; DSD, a high-resolution audio format, up to 5.6MHzDimensions 19.41 x 10.04 x 20.83 inches (H x W x D)Weight 46.9 lb

Who Should Buy It?

The Marantz Grand Horizon is a strong choice if you want a premium, music-first system with the convenience of wireless streaming and a single-speaker footprint. Its combination of substantial amplification, a large multi-driver array, HDMI eARC/ARC and HEOS multi-room capability makes it especially well suited to refined living spaces where a traditional receiver-and-speaker system would feel too involved or visually intrusive.

It is best for listeners who value scale, design and easy everyday access to music and TV sound, while accepting that a one-speaker system cannot replace the separate channels of a full surround setup. Learn more about the Marantz Grand Horizon at Gibbys Electronic Supermarket.

Not sure whether a single premium speaker, a stereo pair, a soundbar or a full home theatre system is the right fit for your room? Talk to the experts at Gibbys Electronic Supermarket. We’ll help you match the setup to how you actually listen, watch and live.