Polk Audio MagniFi Mini AX vs LG SLM4R

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Rating 5 5

MagniFi Mini AX vs SLM4R comparison chart

Polk Audio MagniFi Mini AX
Multichannel surround

Polk Audio MagniFi Mini AX vs LG SLM4R review

Polk Audio MagniFi Mini AX

Comparison of Polk Audio MagniFi Mini AX and LG SLM4R will reveal the best features offered by the devices. MagniFi Mini AX is a better soundbar than the SLM4R. Its sound profile is well-balanced and stereo performance is better. According to the results of our comparison, MagniFi Mini AX received 7.6 points out of 10 possible, and SLM4R was rated 5.2 points.

Advantages Polk Audio MagniFi Mini AX over LG SLM4R

  • Available the Apple Music service
  • Available the Amazon Music service
  • Stream music with Spotify
  • Supports object-oriented sound with Dolby Atmos technology
  • Surround sound with DTS:X support
  • Wireless connection via Wi-Fi
  • HDMI ARC supports
  • Voice control supports
  • Built-in microphone

Advantages LG SLM4R over Polk Audio MagniFi Mini AX

  • Comes with 2 separate speakers

Audio features

The MagniFi Mini AX is rated 4 of 10 against 7 for the SLM4R according to the audio features rating.

MagniFi Mini AX

It worth understanding the difference between the two types of amplification: a passive soundbar does not have its own amplifier and receives amplification from the signal source, while an active soundbar has a built-in amplifier. The same active type of amplification is used in the MagniFi Mini AX and the SLM4R.

There are stereo soundbars and multichannel ones. It is with the help of multichannel devices that you can get volumetric sound. It is worth noting one of the main differences, the MagniFi Mini AX has 3.1 channels, while the SLM4R has 4.1 channels. Also, the output power of the soundbars under consideration is different, Polk Audio MagniFi Mini AX has 10 (overall) W, and 420 (overall) W has the competitor.

MagniFi Mini AX SLM4R
Built-in channels3.14.1
Amplification typeactiveactive
Output power, W10 (overall)420 (overall)
Separate speaker (in package)02
Separate speaker connectionswirelesswireless


Soundbars can have a built-in or external subwoofer. The first type is inseparable from the soundbar body, but for the second, you can choose a good location for deep bass. Both reviewed devices are equipped with an external subwoofer. Competitors support wireless connection to a separate external subwoofer.

MagniFi Mini AX SLM4R
Built-in subwoofer
Separate subwoofer (in package)
Separate subwoofer connectionswirelesswireless

Multichannel surround

Unlike stereo, when reproducing multichannel sound, each specific direction of sound corresponds to its dedicated channel with a separate independent loudspeaker, which creates a three-dimensional sound stage. The MagniFi Mini AX received rating 10 out of 10 for multichannel audio processing, but the SLM4R, in the same category, earned 5 out of 10 points.

MagniFi Mini AX

The peculiarity of Dolby Atmos is that this format is object-oriented, that is, each object of the audio signal is sounded separately and linked to its spatial location. Dolby Atmos surround sound support is implemented only in Polk Audio MagniFi Mini AX.

DTS:X is an algorithm for processing sound scenes by the processor, linking directly to objects, rather than channels, and calculating the optimal distribution of sound output in a room. The manufacturer has implemented DTS:X technology only in MagniFi Mini AX.

MagniFi Mini AX SLM4R
Dolby Atmos
Dolby (other)Dolby Mono, Dolby Digital, Dolby Digital Plus, Dolby Atmos True HDDolby Digital
DTS (other)DTS Digital Surround,DTS-HD, DTS-HD Master Audio, DTS Virtual XDTS Digital Surround

Streaming services

The possibility to listen online to millions of songs from one device has become a reality thanks to streaming services.

MagniFi Mini AX

The popular Spotify service is available on the MagniFi Mini AX.

MagniFi Mini AX SLM4R
Apple Music (AirPlay)
Amazon Music
Other streaming servicesPandora, SoundCloudhas not


The existence of a sufficient number of current connectors significantly expands the functionality of the device. For example, only through HDMI is it possible to implement the transfer of object-oriented formats, and the presence of a Bluetooth connection will allow remote control, etc. The devices received different ratings for connectivity: Polk Audio MagniFi Mini AX was rated 5 out of 10, and LG SLM4R was rated 6 out of 10.

MagniFi Mini AX

The presence of Wi-Fi in the soundbar allows you to get rid of wires when connected to a sound source and get minimal audio latency when playing content from streaming services. Wireless connection via Wi-Fi is possible on the MagniFi Mini AX.

Bluetooth connection is now one of the main communication protocols for speaker systems, which provides excellent quality and minimal audio latency. The availability of Bluetooth protocol, we can see in both models.

HDMI ARC is a very usefull technology that creates a two-way communication channel between a TV and another device. This is convenient since there is no need to use optical and other cables in the system. HDMI ARC is a feature unique to Polk Audio MagniFi Mini AX. Connecting external devices via USB can be done on both models.

MagniFi Mini AX SLM4R
Ethernet (RJ45)00
HDMI input/output1/00/0
Optical digital input/output1/01/0
USB1 (USB 2.0)1 (USB 2.0)
Coaxial digital input/output0/00/0
Analog audio input/output (RCA)0/00/0
Headphone output00
Subwoofer output00


Voice control is designed to make operating the device more convenient. This allows you to control basic soundbar functions from anywhere in the room.

Proprietary applications allow you to control your soundbars remotely. This is possible both via Bluetooth and Wi-Fi. The ability to control the soundbar using the application is implemented in each of the competitors. Only Polk Audio MagniFi Mini AX has a built-in microphone.

Some soundbars can be part of a multi-room system and it is an affordable solution for sounding the whole house. However, it is impossible to create a multiroom system based on each of these soundbars.

MagniFi Mini AX SLM4R
Voice control
App control
Remote control


MagniFi Mini AX SLM4R
Size (Wx H x D), cm/in36.6x10.4x7.9/14.4x4.1x3.189 x 5 x 7.6/35.1 x 2.3 x 3.4
Weight, kg/pounds6.3/142.2/5.2
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