Primacoustic RX7-HF Standard Recoil Stabilizer

The Primacoustic RX7-HF Recoil Stabilizer is a unique speaker-mounting device that eliminates disruptive resonant coupling from the loudspeaker to the stand while providing a stable base that reduces the recoil caused by the forward energy of the loudspeaker motion.The RX7-HF model has a level top surface and fits many monitor models (listed below) with a 2.6" height x 13" width x 10.3" depth.Made from three basic components, the Recoil Stabilizer is essentially a platform for the loudspeaker that features a high-density urethane base that isolates the speaker from the shelf, monitor-bridge or stand. This effectively decouples the loudspeaker to eliminate vibration-borne resonance to the substructure. A heavy laser-cut steel plate is added and sandwiched between the isolation layer and a no-slip neoprene top. The steel plate introduces significant mass to the structure and serves to stabilize the speaker.By reducing the backward recoil energy as the speaker coil pushes energy forward, initial waveform transients no longer suffer lag and the sharpness of the resulting pulse is more defined. The result is significantly greater detail at all frequencies, with tighter bottom end and improved depth of field.The Recoil Stabilizer is available in various sizes and weights to address different speaker designs and may be ordered in both standard and custom angles to precisely aim the loudspeakers for critical listening environments.How It WorksBefore getting into how the Recoil works, it is worth understanding some of the scientific principles involved and what problems they are actually solving.Sound travels through air and other media in waves. These waves compress at various frequencies called wavelengths. Longer wavelengths tend to travel further while shorter ones travel in a more direct line. Longer wavelengths require more energy to generate and, once in motion, are very difficult to contain. With sufficient energy, long wavelengths will cause walls and floors to vibrate. Thunder shaking house is a very good example of lots of energy applied to a low frequency.Okay, so what does this mean in human-speak? Simply put, bass travels through just about anything while high frequencies are fairly simple to control. And has all of this got to do with near field monitors or reference loudspeakers? Those speakers produce bass and bass will transmit through the speaker stand to the floor, the walls and whatever is connected. This is called acoustic coupling. When sound vibrates in the speaker stands, they resonate and produce unwanted sound. To sum up, coupling causes a frequency bump at the resonant frequency that, in turn, changes the speaker's performance.To solve the problem, engineers often employ urethane foam pads or other insulating materials under their nearfield reference monitors as a means to eliminate the resonance that occurs when the speaker and the speaker stand, (shelf or monitor bridge) couple. Good news: this does, in fact, effectively decouple the two devices. Bad news: it introduces a new problem that is best described as recoil.Think of a rifle firing a bullet. The hammer strikes the firing pin which in turn causes the shell to explode, propelling the bullet forward. As the bullet pushes forward the rifle recoils backwards to absorb the energy. This is exactly what is happening when place speakers on a soft, spongy material; during a transient such as a sharp kick drum thump, the forward momentum of the speaker is dulled by foam as the soft malleable substance allows the speaker to tilt backwards and recoil. This recoil may be desirable when firing a rifle, but with a loudspeaker, the movement dulls the initial transient at the start of the wave, and the result is predictable: lose clarity and detail.So what really need is to both decouple the source and provide a stable platform