Description
The Ultimate Expression of Audiophile Precision.
The RBH Reference 661-SFM represents the absolute pinnacle of modular loudspeaker engineering. By combining a world-class LCR monitor with a dedicated low-frequency bass pedestal, this full-range system delivers a jaw-dropping, three-dimensional soundstage with a remarkably compact footprint. Hand-assembled in the USA from heavy-duty High-Density Fiberboard (HDF), the Reference 661-SFM is designed for discerning listeners who refuse to compromise on transient speed, transparency, and dynamic weight.
Elite Driver Technology & Configuration
The “Reference” moniker isn’t just a label—it represents a complete structural upgrade to the finest proprietary transducer technologies RBH has ever developed:
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RBH Reference AMT Tweeter: Replacing traditional dome designs, this elite Air Motion Transformer (AMT) ribbon tweeter moves air with lightning-fast transient response. It delivers an incredibly airy, effortless, and sweet high-frequency presentation extending all the way up to 40kHz with near-zero distortion.
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Reference Aluminum Mid-Woofers: The upper monitor features dual 6.5-inch reference aluminum cone mid-woofers flanking the AMT tweeter in a classic, highly focused Mid-Tweeter-Mid (MTM) layout. These reference drivers are upgraded with machined solid-metal phase plugs in place of traditional dust caps. These phase plugs dramatically improve heat dissipation under heavy loads, eliminate cone-resonance coloration, and vastly improve off-axis performance for an incredibly wide sweet spot.
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Dual 8-Inch Aluminum Subwoofers: Anchoring the system is a bottom-mounted, slot-ported bass module loaded with dual 8-inch proprietary aluminum cone woofers. By physically isolating the heavy bass duties to its own dedicated HDF cabinet, the 661-SFM delivers a chest-thumping, visceral low-end extension down to 30Hz with immaculate timing.
Key Features
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Modular Pedestal Design: Perfect for high-fidelity 2-channel stereo mains or the front left and right foundation of a reference home theater.
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Inert Cabinet Construction: Built using heavy $\frac{3}{4}$-inch High-Density Fiberboard (HDF) with massive internal bracing. This ensures the enclosure remains acoustically dead, preventing cabinet coloration so you only hear pure, unadulterated sound.
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Timbre-Matched Perfection: Seamlessly integrates with all freestanding, on-wall, and in-wall speakers within RBH’s SF, SV, or SI series for a perfectly cohesive multi-channel theater.
