In this review, we will be comparing UIW RLS II and UIW RLS III, two Passive In-wall speakers by Definitive Technology Let's have a brief look at the main features
of Definitive UIW RLS II and Definitive UIW RLS III first before getting into our more
detailed comparison.
Definitive UIW RLS II Key Specs
- 2-way Design
- 1" Hard-Dome Tweeter
- 2 x 6.5" Polypropylene Woofer
- 22-30kHz Frequency Response
- 92 dB Sensitivity
- Impedance: 8ohms
- Power Range:10-350watts
- Dimensions (H x W x D): 724.0" x 7.0000" x 3.8750"( 724.0 x 178.0 x 99.0mm )
Definitive UIW RLS III Key Specs
- 2-way Design
- 1" Hard-Dome Tweeter
- 2 x 5.25" Polypropylene Woofer
- 24-30kHz Frequency Response
- 92 dB Sensitivity
- Impedance: 8ohms
- Power Range:10-325watts
- Dimensions (H x W x D): 604.0" x 5.8750" x 3.8750"( 604.0 x 150.0 x 99.0mm )
What size room are the Definitive UIW RLS II and Definitive UIW RLS III speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision factor. Here we have compared their suitability to various sizes of environments considering their size and max power parameters:
| Listening Environment* |
Definitive UIW RLS II |
Definitive UIW RLS III |
| Near-field |
Are you nuts? |
Are you nuts? |
| Small Room |
Bad |
Bad |
| Mid-size Room |
Poor |
Poor |
| Large Room |
Good |
Good |
| Very Large Room |
Good |
Good |
(* 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.)
In the following sections, we will get into more detail in order to better understand how the Definitive UIW RLS II and Definitive UIW RLS III compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**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.
Drivers
Both UIW RLS II and UIW RLS III are 2-way speakers.
| Driver |
Definitive UIW RLS II |
Definitive UIW RLS III |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
2 x 6.5-inch
|
2 x 5.25-inch
|
UIW RLS II features a 1" Hard-Dome Tweeter and 2 x 6.5" Polypropylene Woofer . On the other hand, the UIW RLS III features a 1" Hard-Dome Tweeter and 2 x 5.25" Polypropylene Woofer .
Frequency Response
UIW RLS II has a frequency range of 22-30kHz whereas UIW RLS III has a frequency range of 24-30kHz. With a minimum frequency of 22Hz, the UIW RLS II can go slightly deeper then the UIW RLS III's min frequency of 24Hz.
Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the In-wall class in our database.
Low Frequency
In-wall Speakers
High Frequency
In-wall Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
UIW RLS II and UIW RLS III have the same Impedance of 8 ohms and their sensitivity is also same at 92 dB.
Sensitivity
In-wall Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. While using an amplifier within this range ensures the nominal performance , inputting a power that is higher than the max wattage can result in a damaged speaker.
UIW RLS II can handle a max power of 350 watts RMS from the amp the whereas UIW RLS III has a max power handling value of 325 watts RMS, 25 watts less than the UIW RLS II.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
UIW RLS II features Spring post type posts and UIW RLS III has a Spring post type posts. None of these speakers feature bi-amping/bi-wiring.
Physical Specs
Size of a speaker can sometimes become an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare Definitive UIW RLS II's and Definitive UIW RLS III's external dimensions. Definitive UIW RLS II has external dimensions of 724.0 x 178.0 x 99.0mm ( 28.5000-inch x 7.0000-inch x 3.8750-inch) whereas Definitive UIW RLS III has external dimensions of 604.0 x 150.0 x 99.0mm ( 23.7500-inch x 5.8750-inch x 3.8750-inch) .
Definitive UIW RLS III is 28mm narrower and 120mm shorter than Definitive UIW RLS II but they have the same thickness of 99.0mm.
What's in the Box of Definitive UIW RLS II?
Here are the items that are included inside the box of UIW RLS II:
In-wall loudspeakerGrilleSelf-adhesive foam gasketPaint maskWall-Mount TemplateOwners ManualOnline Product Registration Card
What's in the Box of Definitive UIW RLS III?
Here are the items that come with the UIW RLS III:
In-wall loudspeakerGrilleSelf-adhesive foam gasketPaint maskWall-Mount TemplateOwners ManualOnline Product Registration Card
Max Input Power 
Woofer Size 
Height 
Base Surface Area 
Price per pair*