Ci3160RLM-THX vs Ci3160RLb-THX: In-Ceiling Speaker Comparison
By Official KEF US Website | HiFi Speakers, Subwoofers | Published: 2026-10-27
Category: Comparisons
Compare the KEF Ci3160RLM-THX full-range in-ceiling speaker and the Ci3160RLb-THX in-ceiling subwoofer. Understand their strengths, trade-offs, and which fits your home theater.
Quick answer
Choose the Ci3160RLM-THX if you need a full-range in-ceiling speaker with the latest Uni-Q driver and MAT technology. Choose the Ci3160RLb-THX if you need a dedicated in-ceiling subwoofer for deep bass in a THX-certified home theater.
Full-range vs. subwoofer: different roles
The Ci3160RLM-THX is a complete in-ceiling speaker designed to cover the full frequency range. It features the 12th generation Uni-Q driver array with Metamaterial Absorption Technology (MAT) and two 6.5" hybrid aluminum bass drivers, making it suitable for main channels in a home theater or stereo system.
The Ci3160RLb-THX, on the other hand, is a dedicated in-ceiling subwoofer. It is certified to THX ULTRA2 and THX SELECT2 standards and is built to deliver deep, impactful bass. It is not designed to reproduce midrange or treble frequencies; it works best when paired with full-range speakers.
THX certification: what it means
Both models carry THX certification, but the specific designations differ. The Ci3160RLM-THX is THX Certified Ultra, indicating it can deliver reference-level performance in larger rooms. The Ci3160RLb-THX is certified to THX ULTRA2 and THX SELECT2 standards, which ensures it can produce the deep bass and output needed for extreme home theater setups.
Installation and system integration
Because the Ci3160RLb-THX is a subwoofer, it requires a separate amplifier or receiver with a subwoofer output and appropriate crossover settings. The Ci3160RLM-THX can be driven directly by an AV receiver or amplifier's speaker channels. Plan your system architecture accordingly: the Ci3160RLb-THX adds bass extension, while the Ci3160RLM-THX handles the full range.
Trade-offs at a glance
- Ci3160RLM-THX: full-range coverage: Covers the entire audio spectrum from bass to treble. Use as a main left/right or surround speaker. Requires no separate subwoofer for basic use, though a subwoofer can still enhance low end.
- Ci3160RLb-THX: dedicated deep bass: Provides powerful, deep bass specifically for home theater LFE (low-frequency effects). Must be paired with full-range speakers for mid and high frequencies. Requires a separate amplifier channel or subwoofer output. Plan for an amplifier with a dedicated subwoofer channel or a separate subwoofer amplifier.
- THX certification level: Ci3160RLM-THX is THX Certified Ultra (larger rooms). Ci3160RLb-THX is THX ULTRA2 and THX SELECT2 certified (extreme home theater). Both ensure reference-level performance in their respective roles. Match the certification to your room size and system ambition.
Product facts
- Ci3160RLM-THX: The Ci3160RLM-THX features the 12th generation Uni-Q driver array with Metamaterial Absorption Technology (MAT) and two 6.5" hybrid aluminum bass drivers, and is THX Certified Ultra. This means it delivers clear, detailed sound across the full frequency range and can handle the dynamics of a large home theater room.
Ci3160RLM-THX - Ci3160RLb-THX: The Ci3160RLb-THX is an in-wall subwoofer certified to THX ULTRA2 and THX SELECT2 standards, designed for deep bass and theatre-thumping output. It provides the low-frequency foundation needed for an immersive home theater experience, but must be paired with full-range speakers for complete sound.
Ci3160RLb-THX
Which one should you choose?
Best for
- Home theater builders who want a single in-ceiling speaker for full-range sound in a THX Ultra system (Ci3160RLM-THX).
- Home theater enthusiasts who need a dedicated in-ceiling subwoofer to add deep, powerful bass to an existing speaker system (Ci3160RLb-THX).
Not for
- Those looking for a single speaker that handles both full-range and deep sub-bass; the Ci3160RLb-THX requires a separate full-range speaker.
- Those on a tight budget; both are premium THX-certified models with corresponding price points.
