Usually if distortion is heard when the speakers are being driven

at loud levels, it is caused by driving (turning up) the amplifier too loud and not driving the speakers with more power than they can handle. Remember, most amplifiers put out their full-rated power well before the volume control is turned all the way up! If your speakers distort when you play them loud, turn down the amplifier or get a bigger one.

Setting Bass and Treble Controls on

Your Receiver or Amplifier

Normally we recommend that you set the “Bass” and “Treble” controls on flat or 0 dB. This will give you the most linear and natural sound. If you want more bass, raise the subwoofer’s “Level” control on your Mythos ST, keeping in mind that even a little turn of the knob can make a big difference in the sound. Also, if your amplifier or receiver has a graphic equalizer, we recommend that you leave it flat. The reason for this is that we have spoken with many consumers about what they thought were improperly sounding speakers when, in fact the problem was misadjusted tone controls. When in doubt, leave them flat; this almost always sounds the best.

Powering Up the Active Subwoofer Section

Your Mythos STs contain a built-in, active powered subwoofer section as well as an electronic crossover and so each Mythos ST must be plugged into an electrical socket of the appropriate voltage (as indicated on the back of your unit) using the plug on the end of the electrical cord which you have attached to the speaker through the hole at the bottom of the base. The Mythos ST has a special circuit which automatically turns the powered subwoofer section on when a signal is fed to the loudspeaker and does not require an on-off switch. Please note that if you hear a pop from the speaker when the amp powers up, this is normal. The LED on the back panel will light up when a signal is sensed and the amplifier turns on. Please note that after the cessation of a signal, it may take up to an hour for the amplifier to actually turn off. In some instances, because of RF presence in your area, the LEDs may not turn off. However, this is nothing to be concerned about as the amplifiers draw almost no power when they are idling.

To prevent accidental damage to the subwoofers built into your Mythos STs from overdriving the system, the subwoofers feature an internal overload protection circuit, which will turn the subwoofers off or down when overdriven or overheated and will then resume normal operation after a few minutes.

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Definitive Technology DI55R owner manual Powering Up the Active Subwoofer Section
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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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