RBH Sound SI-663 - Dreamedia AV
RBH Sound SI-663 - Dreamedia AV
RBH Sound SI-663 - Dreamedia AV
Vendor: RBH Sound

RBH Sound SI-663

In-Wall Speaker with Dual Tweeters, Triple Woofers

RBH Sound Authorized Dealer

Need Help?

We're here to help. Call or chat with a Dreamedia specialist.

Free Shipping

Free nationwide shipping available!*

Free Returns

30 day guarantee.
RBH Sound SI-663

Experience the Pinnacle of Sound with RBH Sound SI-663

Imagine enveloping yourself in an auditory experience so rich and clear that it transcends the ordinary—where every note, every whisper, and every beat is conveyed with a precision that breathes life into your favorite melodies and movie soundtracks. The RBH Sound SI-663 from the Signature Reference Series is not just a speaker; it is a gateway to a world where the line between reality and sound is beautifully blurred.

The Signature Reference Series – A Testament to Audio Excellence

Crafted with over 45 years of RBH Sound's expertise, the SI-663 stands proudly as a part of their esteemed Signature Reference Series. This series represents the zenith of audio craftsmanship, where only the most premium materials meet cutting-edge technology to create a listening experience that is nothing short of extraordinary.

Unparalleled Sound Quality

  • Dual-Channel LCR System: The SI-663's versatility shines through its ability to function as a left, center, or right channel, offering a seamless audio experience across the soundstage.
  • Drive Units: With three 6-1/2" aluminum cone woofers and two AMT tweeters, the SI-663 delivers a powerful and nuanced sound profile that captures every detail.
  • Frequency Response: A wide frequency range of 50Hz-40kHz ensures that from the deepest bass to the highest treble, every frequency is rendered with astonishing clarity.

Design and Installation – A Harmonious Blend of Form and Function

  • In-Wall Speaker: Engineered to blend into your space, the in-wall design provides a clutter-free look without compromising on sound quality.
  • Thoughtful Installation: Features like the metal ring around the baffle and foam pieces for enclosure stability exemplify the meticulous attention to detail that makes installation a breeze.
  • Enclosure: Made of High Density Fiberboard (HDF), the enclosure is engineered for acoustic excellence and durability.

A Closer Look at the RBH Sound SI-663's Advanced Features

Superior Audio Components

  • Aluminum Cone Woofers: The woofers are designed with aluminum cones and solid aluminum phase plugs, providing tight and responsive bass with minimal distortion.
  • AMT Tweeters: The Air Motion Tweeter design allows for higher dynamics and a rich, smooth sound that captures the nuances of each note.
  • Crossover Network: A sophisticated crossover network with premium components ensures seamless integration of the drivers for a cohesive audio experience.

Thoughtfully Engineered for Optimal Performance

  • Sensitivity and Power Handling: With a sensitivity of up to 93dB and recommended power ranging from 75 to 450 Watts, the SI-663 is capable of filling any room with dynamic and lifelike sound.
  • Impedance Matching: The varied impedance levels for different configurations offer flexibility for integration with a wide range of amplifiers and receivers.
  • Dampening Fill: The enclosure's dampening fill minimizes unwanted resonances, resulting in a cleaner and more focused sound.

Aesthetic Integration into Your Living Space

  • Grille Options: Choose between black or white fabric grilles to match the speaker to your room's decor.
  • Seamless In-Wall Design: The slim profile and raised baffle allow for flush mounting, ensuring the speaker complements your space without intrusion.

The Dreamedia Advantage

At Dreamedia, we believe that a home theater system is more than just a collection of gadgets—it's an immersive experience that should be tailored to your unique tastes and space. That's why we're here to help you design a system that incorporates the RBH Sound SI-663, ensuring you get the most out of its exceptional performance capabilities.

Benefits at a Glance

  • Natural and dynamic sound reproduction that brings your audio to life
  • Enhanced piano and music playback for a close-to-real experience
  • Superior imaging and soundstage quality, setting a new standard for in-wall speakers
  • Easy and thoughtful installation process
  • Proudly made in America, supporting local craftsmanship and jobs

Frequently Asked Questions

Q: Can the SI-663 be used as a standalone speaker? A: Absolutely! The SI-663 is versatile enough to be used as a standalone speaker or as part of a larger system, depending on your audio needs.

Q: Is the installation process complicated? A: Not at all. The SI-663 is designed with the installer in mind, featuring elements that simplify the process. Plus, the team at Dreamedia is always ready to assist you with any installation needs.

Q: How does the SI-663 compare to floor-standing speakers? A: The SI-663 offers comparable, if not superior, audio quality to many floor-standing speakers, with the added benefit of a space-saving in-wall design.

In Summary

The RBH Sound SI-663 is more than a speaker—it's an investment in unparalleled audio quality that transforms your home into a sanctuary of sound. Its combination of advanced technology, premium materials, and thoughtful design make it a standout choice for the discerning audiophile.

Take the first step towards the ultimate home theater experience. Let Dreamedia guide you in integrating the RBH Sound SI-663 into your home, and prepare to be enveloped in a soundscape that you have to hear to believe.

For installations where a center channel is intentionally removed from a surround system to allow for design requirements or otherwise cannot be used, the SI-663 is the perfect high-performance solution. A pair of these in-wall speakers can eliminate the need for a dedicated center channel when wired for dual channel operation. For situations where a third SI-663 can be used as a dedicated center channel, the trio can be wired in standard configuration, allowing each to discretely provide left, center or right channels for a seamless front sound stage.

Our Review


RBH Sound has established itself as a reputable manufacturer of high-performance audio products, with over 45 years of experience in the industry. Their Reference Series represents the pinnacle of their speaker lineup, and the RBH Sound SI-663 is a standout product within this range. In this review, we will delve into the design, audio performance, installation options, and overall pros and cons of the SI-663.

Design and Build Quality

The RBH Sound SI-663 boasts a solid construction with its MDF enclosure, providing stability and optimizing sound reproduction. The use of dampening fill inside the enclosure further enhances the audio quality by minimizing unwanted resonance. Additionally, the SI-663 features thoughtful design elements that facilitate installation, such as a metal ring around the baffle, foam pieces for securing the enclosure, and a raised baffle for flush mounting with drywall.

Audio Performance

One of the standout features of the SI-663 is its configuration of two tweeters and three woofers. This arrangement contributes to the speaker's excellent audio performance, delivering natural and dynamic sound reproduction. The 6 ½-inch woofer with a rubber surround and black aluminum cone, along with a phase plug, ensures accurate and controlled bass response. The inclusion of an air motion tweeter (AMT) adds to the speaker's capabilities, providing higher dynamics and a rich, smooth sound.

The SI-663's crossover network is also worth noting, as it features high-quality internal components and gold-plated push connectors. This attention to detail in the crossover design ensures seamless integration between the tweeters and woofers, resulting in a cohesive and balanced soundstage.

Installation and Configuration Options

The RBH Sound SI-663 offers various installation options to suit different room sizes and needs. It can be used as a center channel speaker by pairing two SI-663R speakers, with the top woofer and tweeter of each serving as the center channel. This flexibility allows for versatile setup configurations and ensures optimal performance in home theater systems.

When it comes to installation, the SI-663 excels with its install-friendly design. The metal ring around the baffle adds rigidity and durability, while the foam pieces included with the speaker ensure a secure fit within the wall. The raised baffle allows for flush mounting with drywall, creating a seamless and aesthetically pleasing look.


The RBH Sound SI-663 offers a range of strengths that make it a compelling choice for audio enthusiasts. Its audio performance is exceptional, with natural and dynamic sound reproduction that brings music and movies to life. The speaker particularly excels in piano and music playback, providing a close-to-real experience that is sure to impress even discerning listeners. The SI-663 also surprises with its imaging and soundstage capabilities, exceeding expectations for in-wall speakers and creating an immersive listening experience.

In terms of installation, the SI-663's thoughtful design features make the process easier and more convenient. The inclusion of the metal ring, foam pieces, and the raised baffle demonstrates RBH Sound's attention to detail and commitment to user-friendly installation.

Furthermore, the RBH Sound SI-663 is proudly made in America, supporting local jobs and ensuring high-quality craftsmanship.


While the RBH Sound SI-663 has numerous strengths, it does have a few areas where it falls short. One notable drawback is the lack of tweeter attenuation and boundary compensation features. These features are commonly found in high-end speakers and can help optimize sound performance in different room environments. Their absence in the SI-663 may limit its adaptability and performance in certain setups.

Another minor concern is the use of a cloth grill instead of a magnetic metal grill. While this does not impact the audio quality, a magnetic grill offers easier removal and attachment, providing a more seamless aesthetic when the speaker is being used without the grill.

Lastly, availability may be a limitation for some potential buyers, as RBH Sound only sells their products through authorized dealers. This restricted distribution channel can make it more challenging to find and purchase the SI-663 compared to brands with wider retail availability.


The RBH Sound SI-663 from their Reference Series line is a top-of-the-line in-wall speaker that delivers excellent audio performance, thoughtful design features, and versatile installation options. With its natural and dynamic sound reproduction, impressive piano and music playback capabilities, and good imaging and soundstage performance, the SI-663 is a standout choice for home theater setups and audiophile needs.

While the lack of tweeter attenuation and boundary compensation features, the use of a cloth grill, and limited availability through authorized dealers can be considered minor drawbacks, they do not overshadow the overall strengths and performance of the SI-663. If you can find access to this remarkable speaker, it is sure to elevate your home theater experience and satisfy even the most discerning audio enthusiasts.


General Specifications

  • Type: In-wall speaker
  • Series: Signature Reference Series
  • System Type: Sealed / LCR Dual Channel Speaker

Audio Specifications

  • Frequency Response: 50Hz to 20kHz ±3dB
  • Impedance: 4 ohms
  • Sensitivity: 89dB
  • Recommended Power: 50-250 watts
  • Crossover Frequency: 2,500Hz

Driver Specifications

  • Woofer: (3) 6½-inch aluminum cone woofers
  • Tweeter: (3) 1-inch silk dome tweeters

Physical Specifications

  • Finish: Black or white paintable frame and grille
  • Dimensions (H x W x D): 27 3/4" x 8 1/4" x 3 3/4" (704mm x 210mm x 95mm)
  • Weight: 16 lbs (7.3 kg) each

Design and Installation

  • Installation: In-wall
  • Enclosure Material: High-Density Fiberboard (HDF)
  • Internally Braced: Yes
  • Damping: Well damped


  • Reference Design: Yes
  • Dual-Channel Operation: Yes
  • Seamless Front Sound Stage: Yes when used with three SI-663/Rs wired in single-channel configuration

Trusted by over
5,500+ customers

Product Comparisons

Vendor: Vendor
Example product title
Vendor: Vendor
Example product title
Vendor: Vendor
Example product title

Related Videos & Articles

Educational and Inspirational Posts From Our Team at Dreamedia

Exploring Video Wall Systems: Dive Deep with Us!

Exploring Video Wall Systems: Dive Deep with Us!

Are Focal The Best Outdoor Speakers? Our Full Build Review!

Are Focal The Best Outdoor Speakers? Our Full Build Review!

Exploring the Best of Hi-Fi: Florida Audio Expo Highlights

Exploring the Best of Hi-Fi: Florida Audio Expo Highlights

Enhancing Your Audio Experience with ISO Acoustics

Enhancing Your Audio Experience with ISO Acoustics

Revolutionizing Visual Displays: Our Review of Micro LED Video Walls

Revolutionizing Visual Displays: Our Review of Micro LED Video Walls

The Power of MicroLED: Bringing the Outdoors to Life

The Power of MicroLED: Bringing the Outdoors to Life

Exploring the Future of Home Displays with MicroLED Technology

Exploring the Future of Home Displays with MicroLED Technology

Exploring the Art of Vinyl with Michell Turntables

Exploring the Art of Vinyl with Michell Turntables

Transforming Spaces: The Ultimate Kids' Bunk Room!

Transforming Spaces: The Ultimate Kids' Bunk Room!