Here is a summary comparing the sound quality between 5.1 and 7.1 surround sound systems:
Sound Quality
- 5.1 provides a basic surround sound experience with left, right, center, surround left, surround right, and a subwoofer. Suitable for most rooms.
- 7.1 adds left and right rear surround speakers for greater sense of immersion and envelopment. Better for larger rooms.
- With proper setup, 7.1 offers more precise localization of effects and atmosphere. The extra speakers add depth and dimensionality.
- 7.1 only provides significant benefit if the room is large enough to properly disperse the rear channels. Otherwise it can sound cluttered.
- 5.1 may lack the sense of envelopment in very large or open rooms. 7.1 helps fill the space better.
- 7.1 requires source material specifically mixed for 7.1 to fully utilize the extra channels. Much content is still 5.1.
- Upmixing can expand 5.1 content to 7.1 with varying results. Discrete 7.1 mixes integrate the extra channels better.
Setup and Cost
- 5.1 systems are simpler to set up, more affordable, and have wider compatibility.
- 7.1 systems are more complex, require more amp channels, and cost more. Not all receivers support 7.1.
- Proper placement especially for the rear speakers is important for 7.1. Poor placement diminishes the benefit.
In summary, 7.1 offers clearer localization and greater immersion given proper room size, setup and source material. But 5.1 still provides an excellent surround experience at a lower cost and complexity.
Citations:
[1] https://www.diffen.com/difference/5.1_Surround_Sound_vs_7.1_Surround_Sound
[2] https://thehometheaterdiy.com/5-1-vs-7-1-surround-sound/
[3] https://blog.teufelaudio.com/5-1-7-1-surround-home-audio-system/
[4] https://www.avsforum.com/threads/is-there-a-huge-difference-between-5-1-and-7-1.2843178/
[5] https://www.zeglins.com/blog/which-surround-system-is-best
[6] https://producerhive.com/buyer-guides/hi-fi-speakers/5-1-vs-7-1-surround-sound/