Definitive Technology DI 5.5LCR

In-wall multi-purpose home theater speaker

Item #: 735DI55LCR

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Definitive Technology designed this unobtrusive in-wall speaker specifically for premium sound quality in home theater environments. Install a pair on either side of your TV and use one below or above your TV as a center channel. Each speaker installs flush in your wall. With its paintable, low-profile grille and hidden flange, it practically disappears in your room.

The DI 5.5LCR pairs a pivoting 1" aluminum tweeter with two 5-1/4" drivers for precise highs, full-bodied bass, and impressive dynamic range. The pivoting tweeter allows you to aim the sound directly toward your listening area, so you can fine-tune your system's sound.

Building a system
You can use the DI 5.5LCR in a home theater system, or as part of a multi-room music system. It's voice-matched with Definitive Technology's Mythos and Bipolar speaker lines, so you can mix and match.

An optional Definitive Technology Di 5.5LCR rough-in bracket is recommended for installing this speaker in new construction (brackets sold in pairs).

Got wire?
Most speakers don't include any. Learn more about in-wall wiring at the Crutchfield Learning Center.
Shop our selection of in-wall speaker wire.

Did you know?
Your new speakers will probably sound better after several weeks of use than they do right out of the box. That's because the material surrounding the woofers will loosen up, allowing the drivers to move more fully. Definitive Technology estimates a break-in period of 24 to 48 hours of playback before the speakers will deliver optimum sound quality. For more information and helpful tips, check out this article from Definitive's website about conditioning your speakers.

Priced each

Product Highlights:

  • frequency response 28-30,000 Hz
  • 1" pivoting pure aluminum dome tweeter
  • two 5-1/4" woofers
  • Disappearing™ In-wall speaker design, including hidden flange and low-profile grille
  • 3-position EQ switch helps tailor the sound to your room
  • handles up to 250 watts
  • sensitivity 89 dB
  • 8-ohm impedance
  • paintable white matte grille
  • magnetic grille for easy installation
  • cutout dimensions: 6-7/16" x 14-3/8"
  • mounting depth: 3-1/8"
  • warranty: 5 years
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • Dual 5.25" in-wall L/C/R speaker
  • White grille (paintable)
  • 6 Mounting screws (installed)
  • Cut-out template
  • Owner's Manual
  • Online Product Registration card

Product Research

Overview: The Definitive Technology Disappearing In-Wall loudspeaker (DI Series) offers high-quality sound from a speaker that is barely visible when installed in a wall or ceiling. The Definitive DI Series incorporates BDSS drivers, a pivoting tweeter, and integrated flanges behind an unobtrusive grille to provide audiophile-grade sound quality with an almost invisible appearance.

Features
Mounting Options

Features

Disappearing In-Wall Design: The DI 5.5LCR features Definitive Technology's Disappearing In-Wall Design. The mounting flange thickness of the in-wall loudspeaker is no more than 2.5mm (0.099") and is completely covered by the grille that stands a mere 3.5mm (approx 0.145") from the wall surface. The grille is "micro-perf", that while presenting an opaque appearance, actually has more open area than typical perforated metal grilles allowing the sound to pass through with less interference and better fidelity. Behind the metal grille is an acoustically transparent proprietary cloth scrim that effectively blacks the dark "shadow" of the black speaker parts from showing through the grille.

Pivoting Aluminum Dome Tweeter with Waveguide: The DI Series in-wall loudspeaker uses Definitive Technology's proprietary ceramic-coated annealed aluminum 1" dome tweeter. The DI 5.5LCR tweeter is post mounted, and the tweeter housing is specially smoothed and shaped to use it as an extremely effective low-diffraction waveguide. The aluminum dome tweeter features a pivoting design which allows you to focus the sound toward or away from your listening area depending on the application.

BDSS Drivers: The DI 5.5LCR uses two 5.25" BDSS drivers for wide-bandwidth accurate frequency response, broad dispersion, low distortion, and maximum detail retrieval. Each 5.25" BDSS driver cone is supported by specially tuned soft rubber surrounds at both the outer and inner edges. The double surrounds allow the cone to have longer excursion without distortion. As bass output is a function of both a cone's diameter and excursion, the higher excursion BDSS system brings the benefit of higher bass output from smaller drivers. The DI 5.5LCR's dual 5.25" BDSS drivers have the bass output and dynamic range of a typical 8.0" driver.

Linkwitz-Riley Crossover Network: The Definitive Technology DI 5.5LCR's second order (12dB/octave) Linkwitz-Riley crossover offers a smooth frequency and phase transition from driver to tweeter for natural midrange response and excellent off-axis performance. A Zobel network flattens the impedance curve of the speaker making it easier for today's digital amplifiers to drive the speakers. Custom tight-tolerance (+/- 5%) components are used throughout the crossover for superb unit-to-unit performance consistency. Superior metal film capacitors are used in the high-pass section and the Zobel network for extended high frequency response. Oversize inductors (coils) avoid saturation thereby maintaining the wide dynamic range capabilities of the driver.

Environmental EQ: The Environmental EQ switch (on top-frame of speaker) provides a 1dB broad bandwidth tweeter output lift or cut to compensate for highly absorptive or reflective acoustic environments.

AeroRing: The dimpled AeroRings around the 5.25" drivers are soft Sanoprene rubber and serves several important functions. First, it damps the basket/flange assembly nearest its thinnest part (the flange) to prevent resonance. Second it prevents the grille from rattling in the unlikely event that it makes contact with the speaker frame. It also provides a smooth transition for the waveform coming off the cone. Similar to the dimples on a golf ball that reduce turbulence to aid in longer flight, the dimples on the AeroRing promote smooth "laminar" air flow over the surface thereby reducing diffraction effects. The DI Series in-wall loudspeakers sound clear, natural, and disperse their sound over a wide area.

PolyStone Basket: The driver basket, mounting flange, and mounting system of the DI 5.5LCR is one piece of cast PolyStone; Definitive's exclusive formulation of polymers and minerals that combine the rigidity and strength of metal with the resonance damping properties of plastics. As a result of the one-piece mounting system, the DI 5.5LCR offers increased strength, a compact size, and maximized cone area. Besides being more space efficient than multi-piece construction, it also contributes to the superior sound quality of the DI Series speakers.

Connections: The DI 5.5LCR features a pair of heavy-duty, gold-plated, spring-loaded wire terminals that have oversized holes to accept up to 10 gauge wire.

Definitive's GaussGrip System: Definitive's GaussGrip system securely holds the grille of the in-wall loudspeaker in place with powerful magnets. Simply lay the grille over the speaker and its secure. Taking off the grille is just as easy and fast; no special tools that can chip the grille paint are required. All you need to remove the grille is your fingers.

Paintable Grille: The DI Series in-wall loudspeaker's white "micro-perf" cloth grille can be spray painted to match the color of your wall or ceiling 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; or with indoor latex paint using an airbrush or spray gun (available at home improvement stores). The paint must be diluted to a 6:1 ratio of latex paint to water. Do not remove the backing cloth (scrim). Apply the paint in a series of thin coats sprayed at 45-60 degrees from the grille surface, allowing each coat to fully cure before applying additional coats. To ensure that the paint distribution is evenly applied, each coat should be applied from 4 different directions (N,S,E, & W) to ensure an even coverage on the grille.

Note: The grille must be spray painted detached from the speaker. Do not paint the grille with a brush or roller.

Mounting Options

Applications: The DI 5.5LCR can be used as stereo speakers for music or as front, center, and/or surround speakers in your home theater system.

Mounting: The DI 5.5LCR can be mounted in-wall using the integrated rotating clamps and six mounting screws. A cutout template is supplied to help you cut a 6-7/16" wide x 14-3/8" tall hole. You will need to allow at least 1/2" of space around the cutout and have at least 3-1/8" of clearance for mounting depth (using 1/2" thick mounting surface). You should allow at least 7/8" from the edge of the cutout to nearest obstruction inside the mounting surface.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Definitive Technology DI 5.5LCR Reviews

Average Customer Review:

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Killer Value

Written By DaveG, SLC, UT on Wednesday, November 26, 2014

Crutchfield Customer Review (What's this?)

Easy to install and a great look. It sounds great but it seems like I have to turn up the volume to 3/4 power in order to hear the vocals on movies. This is not a big deal as it sounds great when I reach that level. I would definitely purchase this product again but I think I would pay an extra $100 to get the 6.5" woofer. I was not told of this option at purchase but that may have been because I told the sales rep that I was on a budget but still would have liked to know about the option.

Pros: East to install and great look.

Cons: Have to turn up to 3/4 power to hear voice on movies

Awesome

Written By KW, NYC on Monday, May 26, 2014

Crutchfield Customer Review (What's this?)

Purchased three to use as Left, Center and Right. The sound quality is amazing. Using with 5.5R back channels and 800 Sub. Could not be any happier. Reasonably priced. Voice clarity is stunning. We use most;ly for TV/Movies. They look fantastic when mounted giving a very clean look. Could not be happier and highly recommend to anyone. Definitive makes amazing products which do not disappoint.

Pros: Great sound Clear voices Looks great mounted

Cons: None

Ceiling Speakers

Written By Philly H, Newport Beach CA on Monday, March 25, 2013

Crutchfield Customer Review (What's this?)

High quality and great appearance...........very clean and tusy.

I put these in my very modern, minimalist living room and they fill the room with quality sound. I am jsut using them for sound...not in a home theatre application, but woul be fine for that

Pros: Appearance, ease of installation.....grills are very nice.. sound is quality for the price I recommend

Cons: A little weak on the low end, but what do you expect from a smaller speaker?

Get everything you’ll need to enjoy your new Definitive Technology DI 5.5LCR

Set the volume level in your remote location without going back and forth from room to room.
UL-listed speaker wire is designed to be run through walls and is building code compliant. Most speakers don't include speaker wire.
Install these before your drywall goes up to mark your speaker locations for your builder, so you won't need to cut holes later.
A speaker selector will let multiple pairs of speakers act like just one to your receiver.
Have your speakers installed by qualified professionals.
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Definitive DI 5.5LCR Rough-in Brackets

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