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RBH Sound SI-615 In-Ceiling Atmos Speakers Review
The RBH Sound SI-615 Signature Series in-ceiling speakers, accompanied by their backboxes, are presented as a transformative solution for updating home reference systems to immersive surround sound, specifically a 7.5.4 configuration. These speakers are part of RBH Sound's Signature in-wall line, designed to deliver high-quality audio performance without the physical footprint of traditional floorstanding speakers. The SI-615 features a 6-1/2 inch aluminum cone woofer and a ¾-inch pivoting ring-radiator tweeter, boasting a sensitivity rating of 88dB (2.83V @ 1 meter) and a bass extension down to 50Hz (-3dB, free air).
The article highlights that the SI-615 is primarily intended for in-ceiling channels in object-based surround sound systems, like Dolby Atmos, but can also serve in high-end stereo listening or whole-house audio setups. The review focuses on installing two pairs of SI-615s with matching BC-6R insulated backcans as height channels, emphasizing RBH Sound's commitment to acoustic science over marketing by not producing 'bouncy house speakers.' The installation process is described as straightforward, involving attaching the SI-615 to the BC-6R backcan. Alternative shallower backcans (BC-6S) or foam backboxes (FB-6C) are mentioned for installations with limited space, with a strong recommendation to use one of these options to provide a controlled acoustical environment, which is crucial for optimal performance and may also be a safety requirement in some areas. Installation tips include using the provided cardboard template for cutting the ceiling hole, connecting speaker wires before mounting, and being careful not to overtighten the clamps.
A notable feature is the magnetic grilles, which can be painted to match the ceiling, offering a visually discreet integration. It is advised to remove the cloth lining inside the grille for optimal high-frequency performance. Speaker placement and setup are discussed in detail, with the reviewer aiming for optimal coverage for two rows of seating, aligning with Dolby's recommendations for height channel angles and spacing. The article also touches upon the pivoting tweeter, noting that in the reviewer's setup, it was left in the default position as broader coverage was preferred for height channels. However, for installations with more extreme angles, the VA-615 model with a fixed 15-degree offset woofer is suggested.
The review includes a technical measurement section, where the SI-615's impedance is analyzed, revealing it to be rated at 8 ohms but measuring slightly lower at very high frequencies, indicating the use of a 4-ohm tweeter to enhance system sensitivity. The phase angle is deemed benign, and the speakers are considered an easy load for most receivers. The impact of the backcan on system resonance is also discussed, showing a shift from 45Hz to just under 100Hz, a trade-off for improved isolation. A smoothed frequency response measurement indicates the speaker's performance in an in-room setting. Listening tests, conducted with a Yamaha CX-A5100 Atmos processor and MX-A5000 amplifier, involved evaluating the speakers with the Dolby Atmos August 2014 Demo disc and various movies. The reviewer initially found the elevation effect subtle but observed a significant improvement in immersion and directional cues after switching side channels from bi-poles to monopoles, confirming Dolby's recommendation for immersive surround sound setups. The SI-615s are praised for their tonal consistency with other RBH Signature series products and their ability to create a seamless, enveloping soundstage, even with upmixed 5.1 content through the Dolby Surround Upmixer. The article concludes by highlighting the SI-615s as a capable in-ceiling speaker choice for Atmos, praising their sonics, ease of installation, and magnetic grilles. The primary drawback noted is the price of $525 per speaker, which positions them as a premium option for height effects compared to Atmos-enabled reflection speakers, but justifies the cost for those seeking a significant upgrade in sound quality within a discrete immersive surround system.
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