SpeakerDecision
  • SPEAKERS by TYPE
    • Passive Bookshelf Speakers
    • Passive Floor-standing Speakers
    • Passive Center Channel Speakers
    • Passive In-wall Speakers
    • All Passive Speakers
    • Powered Subwoofers
    • Powered Stereo Speakers
  • AMPLIFIERS
  • SMART FIND
  1. Home
  2. Definitive-Technology Speakers
  3. Passive In-wall Speakers
Definitive Technology UIW RLS III Review
Definitive Technology UIW RLS III

Main Features

  • 1" Hard-Dome Tweeter
  • 2 x 5.25" Polypropylene Woofer
  • 2 x 5.25-inch Passive Radiators
  • 24-30kHz Frequency Response
  • 92 dB Sensitivity
  • Impedance: 8ohms
  • Power Range: 10-325watts
  • Dimensions(HxWxD): 23.7500"x5.8750"x3.8750" / 604.0 x 150.0 x 99.0mm
CHECK PRICE

Compare To

x
Add a Speaker for comparison
Definitive UIW RLS III Review
Definitive UIW RLS III Definitive UIW RLS I...
See at AMAZON

Definitive Technology UIW RLS III is a 2-way Passive In-wall In-wall speaker by Definitive Technology. It features a 1" Hard-Dome Tweeter and 2 x 5.25" Polypropylene Woofer. UIW RLS III also employs 2 x 5.25-inch passive radiators. The speaker has a frequency range of 24-30kHz and a sensitivity of 92 dB. Definitive UIW RLS III has an MSRP of 1398$ per pair.

Room Size Suitability

The size of the room where you plan to use the Definitive UIW RLS III is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:

Listening Environment* Suitability
Near-fieldAre you nuts?
Small RoomBad
Mid-size RoomPoor
Large RoomGood
Very Large RoomGood

(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2. Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)


**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Frequency Response of the Definitive UIW RLS III Speaker

Definitive UIW RLS III has a Frequency response range of 24-30kHz at ±3dB and Power Range of 10-325 watts. With a minimum frequency of 24 Hz, UIW RLS III delivers deep bass that will likely satisfy most listeners, especially those who enjoy music. However, movie enthusiasts and music fans who prefer a full range of sound may still benefit from adding a subwoofer.

To focus on the subwoofers that are in a similar price range with Definitive UIW RLS III, check out the Powered Subwoofers under $1500. Alternatively, find the Full list of Powered Subwoofers regardless of the price.
Here we have a comparison of how UIW RLS III's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
In-wall Speakers
Definitive UIW RLS III
Min
Average
Max
High Frequency
In-wall Speakers
Definitive UIW RLS III
Min
Average
Max

Impedance and Sensitivity

Definitive UIW RLS III's nominal impedance level is 8 ohms and has a sensitivity of 92 dB.

Sensitivity
In-wall Speakers
Definitive UIW RLS III
Min
Average
Max

8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Definitive Technology UIW RLS III is not considered a difficult to drive speaker from nominal Impedance perspective.

Sensitivity

92dB of the Definitive Technology UIW RLS III is considered a high sensitivity compared to average stereo speaker which makes UIW RLS III an easy to drive from Sensitivity perspective. If you are planning to power your speaker with a Tube amp which are generally very low power, the Definitive UIW RLS III will be a good choice.

Check the amplifiers that are in a similar price range to the Definitive UIW RLS III:

  • Integrated Amps under 1000 USD
  • Integrated Amps under 1500 USD
  • Integrated Amps under 2000 USD
  • All Integrated Amplifiers

Input Type

UIW RLS III features Spring post type connectors. Bi-amping and Bi-wiring are not possible.

Definitive UIW RLS III External Dimensions and Weight

Definitive UIW RLS III has external dimensions of (Height x Width x Depth) 23.7500-inch x 5.8750-inch x 3.8750-inch (604.0 x 150.0 x 99.0mm ).

Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base area of Definitive UIW RLS III is approximately 148.5cm2 / 23.0inch2.

How does the Definitive UIW RLS III compare to the Definitive Technology UIW RLS II?

One of the natural alternative to the Definitive UIW RLS III is the UIW RLS II which is located one step higher in Definitive Technology's Passive In-wall selection.

Check the Detailed Comparison of Definitive UIW RLS III vs UIW RLS II for more details.

Cabinet type and Materials

Definitive UIW RLS III has a In-wall type cabinet.

What's in the Box of Definitive UIW RLS III?

Here are the items that are included inside the box of UIW RLS III:
  • In-wall loudspeaker
  • Grille
  • Self-adhesive foam gasket
  • Paint mask
  • Wall-Mount Template
  • Owners Manual
  • Online Product Registration Card
  • Recommended Accessories

    Here is a list of accessories that we think you may need for the Definitive Technology UIW RLS III.

    • Speaker Cable and Connectors
      • Speaker Cables with Banana Plugs: If you know the lenght of the cable you need, this is the easier option to connect your speakers with your amp.
      • Speaker Cables without Connectors: If you are not sure about the lenght or need longer than standard cables with plugs, choose this option.
      • Banana Connectors and Plugs: If you chose the cables without connectors option or already have some cable around, pick the banana plugs separately.
    • Vibration Isolators: IsoAcoustics isolators more affordable options too.
    • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.

    Warranty

    5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.

    Definitive Technology UIW RLS III Alternatives in Passive In-wall Speakers
    Model Type Sensitivity Impedance Frequency
    Definitive UIW RLS II
    Compare
    2-way 92 dB 8 ohms 22-30kHz
    Polk Audio 265-LS
    Compare
    3-way 91 dB 8 ohms 28-33kHz
    Definitive DI 6.5LCR
    Compare
    2-way 90 dB 8 ohms 26-30kHz
    B&W CWM663
    Compare
    2-way 88 dB 8 ohms 45-50kHz
    JBL Studio 6 88LCR
    Compare
    2-way 96 dB 6 ohms 43-20kHz
    Focal 300 IW 6
    Compare
    2-way 90 dB 8 ohms 55-28kHz
    Definitive UIW RSS III
    Compare
    2-way 90 dB 8 ohms 40-30kHz
    MartinLogan Motion CI MW6
    Compare
    2-way 90 dB 5 ohms 62-25kHz
    Frequently Asked Questions about Definitive Technology UIW RLS III
    What is the External Dimensions of Definitive Technology UIW RLS III
    What is the Speaker Sensitivity of Definitive Technology UIW RLS III
    is the Definitive Technology UIW RLS III an easy to drive speaker?

    Definitive UIW RLS III Detailed Specifications

    General
    BrandDefinitive Technology
    Full Model NameDefinitive Technology UIW RLS III
    Speaker Type2-way In-wall
    Power Range10-325 watts
    Sensitivity92 dB
    Impedance8 ohms
    Frequency Response24-30kHz
    DRIVERS
    Woofer Size5.25-inch
    Woofer CompositionPolypropylene
    Woofer SurroundButyl Rubber
    Tweeter Size1-inch
    Tweeter TypeHard-Dome
    Aimable TweeterNo
    Midrange SizeN/A-inch

    CONNECTIONS
    Connector TypeSpring post
    Biamp InputsNo
    PHYSICAL SPECS
    Height604.0mm ( 23.7500-inch)
    Width150.0mm ( 5.8750-inch)
    Depth99.0mm ( 3.8750-inch)
    Height604.0mm ( 23.7500-inch)
    Weightkg ( lbs)
    EnclosureIn-wall
    Moisture ResistanceYes
    OTHER
    Handheld RemoteNo
    Parts Warranty5 Years
    Labor Warranty5 Years
    LATEST BLOG POSTS

    Klipsch La Scala AL6 and Klipschorn AK7 Speakers are Unveiled
    New Audiolab 6000A MkII with upgraded DAC and new HDMI ARC connection
    Q Acoustics 3000c Series Loudspeakers added to the database
    WiiM VibeLink Amp: A Game-Changer for Budget Hi-Fi in 2025
    KEF Meta and Reference Meta Floorstanding Speaker Size and Specs Comparison
    Triangle Borea Bookshelf and Floorstanding Speaker Size and Specs Comparison


    Latest Passive In-wall Speakers
    Sonos In-wall Speakers
    Sonos In-wall Speakers
    2-way In-wall | 89 dB | 8 ohms
    MartinLogan Installer Series IW5-LCR
    MartinLogan Installer Series IW5-LCR
    2-way In-wall | 89 dB | 8 ohms
    MartinLogan Installer Series IW6
    MartinLogan Installer Series IW6
    2-way In-wall | 89 dB | 8 ohms
    Bowers & Wilkins Flexible Series CWM362
    B&W CWM362
    2-way In-wall | 89 dB | 8 ohms
    Monitor Audio CP-WT240LCR
    Monitor Audio CP-WT240LCR
    2-way In-wall | 88 dB | 6 ohms
    ELAC IW-DC51-W
    ELAC IW-DC51-W
    2-way In-wall | 87 dB | 6 ohms
    JBL Studio 6 88LCR
    JBL Studio 6 88LCR
    2-way In-wall | 96 dB | 6 ohms
    MartinLogan Axis
    MartinLogan Axis
    2-way In-wall | 94 dB | 4 ohms
    Monitor Audio W165
    Monitor Audio W165
    2-way In-wall | 88.5 dB | 6 ohms
    Monitor Audio CP-WT150
    Monitor Audio CP-WT150
    2-way In-wall | 85 dB | 6 ohms


    Copyright © 2025 by SpeakerDecision
    About Privacy Contact US Camera Decision
    Compare List

      Add a speaker to the List