In this review, we will be comparing CP-WT150 and UIW RSS II, two Passive In-wall speakers from Monitor Audio and Definitive Technology. Let's have a brief look at the main features
of Monitor Audio CP-WT150 and Definitive UIW RSS II first before getting into our more
detailed comparison.
Monitor Audio CP-WT150 Key Specs
- 2-way Design
- 1" Hard-Dome Tweeter
- 5" Poly Woofer
- 75-25kHz Frequency Response
- 85 dB Sensitivity
- Impedance: 6ohms
- Power Range:20-50watts
- Dimensions (H x W x D): 326.0" x 8.1250" x 3.7500"( 326.0 x 207.0 x 96.0mm )
Definitive UIW RSS II Key Specs
- 2-way Design
- 1" Hard-Dome Tweeter
- 2 x 4.5" Polypropylene Woofer
- 26-30kHz Frequency Response
- 90 dB Sensitivity
- Impedance: 8ohms
- Power Range:10-250watts
- Dimensions (H x W x D): 296.0" x 9.8750" x 3.8750"( 296.0 x 251.0 x 99.0mm )
What size room are the Monitor Audio CP-WT150 and Definitive UIW RSS II 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* |
Monitor Audio CP-WT150 |
Definitive UIW RSS II |
| Near-field |
Good |
Poor |
| Small Room |
Good |
Poor |
| Mid-size Room |
Average |
Good |
| Large Room |
Poor |
Good |
| Very Large Room |
No way |
Average |
(* 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 Monitor Audio CP-WT150 and Definitive UIW RSS II 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 CP-WT150 and UIW RSS II are 2-way speakers.
| Driver |
Monitor Audio CP-WT150 |
Definitive UIW RSS II |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5-inch
|
2 x 4.5-inch
|
CP-WT150 features a 1" Hard-Dome Tweeter and 1 x 5" Poly Woofer . On the other hand, the UIW RSS II features a 1" Hard-Dome Tweeter and 2 x 4.5" Polypropylene Woofer .
Frequency Response
CP-WT150 has a frequency range of 75-25kHz whereas UIW RSS II has a frequency range of 26-30kHz. With a minimum frequency of 26Hz, the UIW RSS II can go significantly deeper on the low side and provide stronger bass compared to the CP-WT150's min frequency of 75Hz.
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
CP-WT150 is a 6 ohms speaker compared to the UIW RSS II which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. CP-WT150 sensitivity is rated at 85 dB and the UIW RSS II's is rated at 90 dB. This 5 dB difference makes the Definitive UIW RSS II a more sensitive speaker compared to Monitor Audio CP-WT150, hence will play louder with the same amount of watts.
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.
CP-WT150 can handle a max power of 250 watts RMS from the amp the whereas CP-WT150 has a max power handling value of 50 watts RMS , 200 watts less than the UIW RSS 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
CP-WT150 features Spring pst type posts and UIW RSS II has a Spring pst 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 Monitor Audio CP-WT150's and Definitive UIW RSS II's external dimensions. Monitor Audio CP-WT150 has external dimensions of 326.0 x 207.0 x 96.0mm ( 12.8125-inch x 8.1250-inch x 3.7500-inch) whereas Definitive UIW RSS II has external dimensions of 296.0 x 251.0 x 99.0mm ( 11.6250-inch x 9.8750-inch x 3.8750-inch) .
Monitor Audio CP-WT150 is 44mm narrower and 3mm less deeper than Definitive UIW RSS II but it is also 30mm taller.
What's in the Box of Monitor Audio CP-WT150?
Here are the items that are included inside the box of CP-WT150:
In-wall speakerMagnetic grilleCosmetic scrimInstallation GuideImportant Safety InstructionsLimited Warranty/Registration CardMountingTemplate
What's in the Box of Definitive UIW RSS II?
Here are the items that come with the UIW RSS II:
In-wall/In-cieling bipolar speakerGrille7 Foam strips2 ScrewsPaint maskWall templateOwners ManualOnline Product Registration Card
Woofer Size 
Base Surface Area 
Price per pair* 
Max Input Power 
Sensitivity 
Nominal Impedance 
High Frequency Response 
Passive Radiator 
Height