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Definitive Technology UIW RCS III In-ceiling multi-purpose speaker with built-in back-box

Item # 735UIWRCS3

A built-in enclosure helps this versatile in-ceiling speaker deliver focused, dynamic sound for music and home theater.

A built-in enclosure helps this versatile in-ceiling speaker deliver focused, dynamic sound for music and home theater.

5 questions - 6 answers

Item # 735UIWRCS3

In stock
$649.00 each

Other options

About the Definitive Technology UIW RCS III

Kramer Crane

Excellent overhead sound from Def Tech

Designing a custom-installed home theater? Definitive Technology's UIW RCS (Reference Line Source) III in-ceiling speaker uses an angled-baffle design to bring sound down and toward you, making it a great choice for the front left, center, or right channel in your surround system.

Excellent overhead sound from Def Tech

Designing a custom-installed home theater? Definitive Technology's UIW RCS (Reference Line Source) III in-ceiling speaker uses an angled-baffle design to bring sound down and toward you, making it a great choice for the front left, center, or right channel in your surround system.

Pair the UIW RCS III with Reference Line Source in-wall speakers for seamless, voice-matched sound throughout your room. 

Definitive Technology UIW RCS III In-ceiling multi-purpose speaker with built-in back-box

The integrated sealed enclosure helps deliver excellent sound while keeping dust and dirt away.

Dual passive radiators help deliver extra punch

The UIW RCS III pairs two 4-1/2" polypropylene midrange/bass drivers with a 1" aluminum dome tweeter to produce the natural, revealing sound Def Tech is known for.

Dual 5-1/4" x 4-1/8" pressure-coupled passive radiators help reinforce this in-ceiling speaker's impressive bass output. 

A built-in enclosure elevates performance

One of my favorite features of the UIW RCS III is the back-box that's built onto the speaker.

This carefully designed enclosure helps the speaker deliver consistently focused, well-balanced sound no matter what kind of space is behind it in your ceiling. It also keeps dust and dirt out. 

DIY installation

You can paint the included grille to have your speaker blend in with your room's décor.

If this is a do-it-yourself install, check out our guide to installing in-ceiling speakers, along with our selection of in-wall speaker wire.

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Product highlights:

  • ideal for an in-ceiling music system, or as part of a custom-installed home theater system
  • built-in back-box ensures well-balanced sound and protects against dust and dirt
  • angled-baffle design for directing sound toward your listening position
  • 1" aluminum dome tweeter
  • dual 4-1/2" polypropylene cone midrange/bass drivers with cast baskets
  • dual 5-1/4" x 4-1/8" pressure-coupled passive radiators for extended bass response
  • frequency response: 30-30,000 Hz
  • nominal impedance: 8 ohms
  • sensitivity: 92 dB
  • magnetic grille is paintable to match your décor
  • cutout dimensions: 10-3/8"W x 10-3/8"H
  • overall dimensions: 11-1/2"W x 11-1/2"H
  • mounting depth: 5-7/8"
  • weight: 13 lbs.
  • warranty: 5 years
  • MFR # UEOA

What's in the box:

  • In-ceiling loudspeaker
  • Grille
  • 6 Foam strips
  • 4 Screws
  • Paint mask
  • Wall template
  • Owner's Manual
  • Online Product Registration Card

Customer reviews for Definitive Technology UIW RCS III

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More details on the Definitive Technology UIW RCS III

Stacey B.

Features & specs

Features
Quantity in Package Single
Tweeter Hard-Dome
Aimable Tweeter No
Woofer Composition Polypropylene
Woofer Surround Butyl Rubber
Connector Type Spring post
Bi-Amp Inputs No
Built-in Back-box Yes
Moisture Resistance
Indoor (Moisture-resistant) Yes
Outdoor (Partial Exposure) No
Outdoor (Full Exposure) No
Specs
Tweeter Size 1
Midrange Size N/A
Speaker Shape Square
Woofer Size 4.5
Cutout Width 10.375
Cutout Height 10.375
Mounting Depth 5.875
Power Range (Watts) 10-250
Sensitivity 92 dB
Impedance (Ohms) 8
Frequency Response 30-30kHz
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Features

D'Appolito Driver Array: The UIW RCS III in-ceiling speaker features a D'Appolito driver array angled down and aimed at the listening area . The D'Appolito driver array consists of two 4.5" cast-basket midbass/midrange drivers and a 1" pure aluminum tweeter, as well as two 5.25" x 4.125" pressure-coupled planar low bass radiators. Because of  its active driver/bass radiator combination the RCS III achieves an extended low-frequency response, which is deep and dynamic with a smooth and controlled roll-off that allows it to seamlessly blend with a subwoofer such as Definitive Technology's in-wall IWSub 10/10 or the UIW Sub Reference (sold separately).

Proprietary Wave Launch Technology: Proprietary Wave Launch (patent pending) baffle geometry and acoustic treatment materials serve to create the illusion that the speakers are directly in front of the listener rather than up in the ceiling. The precisely configured dual angled baffles incorporate a uniquely effective acoustic treatment which combines a computer-optimized ribbed surface with special dampening panels in order to achieve a linear uncolored sound combined with three-dimensional imaging in which acoustic events seem to effortlessly float in space.

Non-Resonant Sealed Enclosure: The RCS III features a non-resonant sealed medite (a dense wood product) enclosure to deliver the tight, detailed bass and uncolored midrange of audiophile free-standing speakers in every installation. The performance of open back built-in speakers will vary depending on the nature of the ceiling cavity behind the speaker. But Definitive Reference series speakers with integrated enclosures sound superb every time.

Paintable: The UIW RCS III in-ceiling loudspeaker's grille and frame can be spray painted to match the color of your wall without any loss of sound quality. Simply remove the grille from the speaker and place it on a drop cloth, newspaper, or plastic sheet and spray paint it with canned spray paint that closely matches the desired finish/color (available at home improvement stores). A paint mask is supplied to protect the drivers when painting the frame.

Spring-Loaded Speaker Terminals: The UIW RCS III in-ceiling loudspeaker features a pair of heavy-duty, gold-plated, spring-loaded posts designed to accept up to 10 gauge wire, banana plugs (single only), or pin-connectors.

Applications: The UIW RCS III is intended for use as an in-ceiling front main left, center or right channel speaker, as well as a rear or side surround speaker in custom installed home theater systems of the highest quality. In addition, it can be used as a superb left or right speaker in a high quality stereo music system.

In-Ceiling Installation: Eight rotating dogleg clamps and four 3.5" wood screws make the RCS III easy to install in either new or existing construction and provide secure, non-resonant mounting for ultimate audiophile performance free of vibrations and buzzes.  In-ceiling installation requires a cutout of 10.375" (w) x 10.375" (h). The interior size of the cavity must be at least between 10.5" (w) x 12.75" (h) x 5.875" (d). A 1" of clearance is required around the cutout, on the outside mounting surface, to clear the in-ceiling speaker's bezel.

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Customer Q&A

5 questions already asked

Q
Would these speakers work for back speakers?They would sit approximately 2 feet behind the couch in the ceiling.
haybri  Jan 13, 2024
1 answer
A
This Definitive Technology UIW RCS III would work well for in-ceiling rear surrounds, Brian.
bo  Jan 13, 2024 (Staff)
Q
Do you need two of these speakers in order to get stereo sound?
michael  Dec 06, 2023
1 answer
A
Greetings Michael. Thank you for your question. Yes. One speaker can only be a left, or a right speaker. To play stereo, you will need two.
hogan  Dec 09, 2023 (Staff)
Q
Do you need two of these speakers to get stereo sound for Sonos hookup?
michael  Dec 06, 2023
1 answer
A
In order to have proper stereo sound, it would be necessary to have two of these speakers.
zachary  Dec 06, 2023 (Staff)
Q
Do these speakers perform well as mains in a HT setup?
jeff  Mar 14, 2023
1 answer
A
Yes. These are designed specifically for use as home theater speakers including use as main speakers.
zachary  Mar 15, 2023 (Staff)
Q
Can these speakers be simply mounted in the ceiling cutout, or do they have to be screwed into joists?
bill  May 14, 2022
2 answers
A
According to the manaul, it states that it does need to be attached to joists: *VERY IMPORTANT* Please note that the pivoting lock arms are not designed to support the weight of the speaker. They are only designed to pull the speaker tight to the ceiling and prevent it from rattling. Do not use them for supporting the speaker. The screws going through the speaker and into the joists are there for support and must be properly used.
thomas  Oct 09, 2022
A
That's correct! These speakers absolutely can be mounted into a ceiling cutout, without mounting to joists.
bo  May 17, 2022 (Staff)
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Definitive Technology UIW RCS II

Definitive Technology UIW RCS II

In-ceiling multi-purpose speaker with built-in back-box
$849.00 each
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Get fuller sound from larger drivers

The Definitive Technology UIW RCS II offers these features:
  • dual 5-1/4" polypropylene cone midrange/bass drivers with cast baskets
  • dual 6-1/2" pressure-coupled passive radiators for extended bass response
  • frequency response: 22-30,000 Hz
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