a sonic point of view. Speakers may be angled in toward the listening position or left parallel with each other. Angling the speakers in (pointed directly at the listener) will result in a somewhat brighter, clearer sound with a sharper focus and a more solid central image (generally, we recommend this), while leaving the speakers parallel with each other will result in a less bright, warmer sound.

Positioning Mythos ST as Rear/Side Surrounds

When used as rear or side surround speakers, Mythos ST may be located on the side or behind the listeners. When used on the sides, take care never to locate the speakers forward of the listeners. If the speakers are placed on the rear wall, it is suggested that they be positioned fairly wide apart if possible. (For instance, if there is a couch in the center of the rear wall on which the listeners will sit, try to position the speakers wider apart than the couch.)

“Spiking” Your Loudspeakers

An optional “spiking” kit has been provided should you desire to “spike” your loudspeakers. “Spiking” your loudspeakers will provide much greater stability when placing your loudspeakers on carpeting. It will also, according to many experts, result in an overall improvement in sonic performance. Care should be taken when using spikes as they may cause damage to wooden or other floors which are susceptible to being scratched. Definitive Technology is specifically not responsible for damage which may result from the use of spikes.

The spike kit contains five spikes. To install, unscrew the non-marking tips

from the centers of the five leveling feet and screw the five spikes in their places. Then, with the help of another person, lift the speaker upright and lower it to

Speaker Break-In

Your Mythos STs should sound good right out of the box; however, an extended break-in period of 40-60 hours or more of normal playing is required to reach full performance capability. Break-in allows the suspensions to work in and results in fuller bass, a more open “blossoming” midrange and smoother high frequency reproduction.

Connecting Your Loudspeakers

Your Mythos STs have a set of speaker level (high level) 5-way binding posts and in addition, each speaker has an LFE input. This input can be used with Dolby Digital* and DTS* 5.1 (6.1, 7.1) decoders to separately feed the discrete “Low Frequency Effects” channel into each subwoofer (which then combines with

the low bass present separately in the left or right channel signals). Unlike a conventional system, where the subwoofer is driven only by an LFE subwoofer signal, the Mythos STs are much more sophisticated and are driven by the left or

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Definitive Technology DI55R owner manual Spiking Your Loudspeakers, Speaker Break-In, Connecting Your Loudspeakers
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DI55R specifications

The Definitive Technology DI55R is an innovative architectural speaker that combines high-performance audio quality with sleek design, making it an excellent choice for home theater systems and multi-room audio setups. This in-wall model is engineered to deliver superior sound reproduction, ensuring that users experience their favorite music, movies, and shows in a way that is both immersive and engaging.

One of the standout features of the DI55R is its advanced driver technology. The speaker is equipped with a 5.25-inch bass driver and a 1-inch aluminum dome tweeter. This combination allows the DI55R to deliver a full range of frequencies, from deep bass to crisp highs, creating a balanced sound that is both rich and detailed. The bass driver utilizes a poly graphite cone for enhanced rigidity and minimal distortion, allowing for accurate sound reproduction even at higher volume levels.

To further enhance the listening experience, the DI55R employs Definitive Technology's patented BDSS (Balanced Double Surround System) technology. This unique design offers improved midrange response and wider dispersion of sound, ensuring that every listener in the room can enjoy consistent audio performance, no matter where they are seated. The result is a speaker that can fill a room with sound, making it ideal for larger spaces.

Installation of the DI55R is designed to be as straightforward as possible. The speaker features a convenient, paintable grille that can be customized to match the décor of any room. Additionally, its low-profile design ensures that it blends seamlessly into walls, providing an unobtrusive audio solution without sacrificing performance. The speaker's rear enclosure is engineered to minimize sound leakage, further enhancing the clarity and integrity of the audio.

In terms of connectivity, the DI55R is compatible with a variety of audio systems, enabling effortless integration into existing setups. Its robust construction and quality components make it a dependable choice for both casual listeners and audiophiles alike.

Overall, the Definitive Technology DI55R stands out as a premium architectural speaker that brings together advanced technology, exceptional sound quality, and aesthetic appeal. Its combination of features makes it a versatile addition to any audio system, allowing users to transform their spaces into immersive sound environments.
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