S4X™ 4th-Order Crossovers  |  Wide Angle® Technology  |  3-Way/4-Way Switch  | Subwoofer Processing
Industry Leading Quality Control  |  Anti-Resonance Wall Mounting Systems  |  Patents


S4X™ Super 4th-Order Crossovers

The name, Induction Dynamics, is derived from the patented S4X Super 4th-Order Crossover network. The S4X inductively stacked crossover coils not only take up half the space of traditional 4th order crossovers, but also produce the industry’s steepest crossover slopes. The unique design produces slopes in excess of 30 decibels per octave, optimizing each driver’s performance both individually and when interacting with the other drivers. The unique technologies increase control over range, frequency response, phase, and impedance.

The S4X’s reduced space requirements allows complex, oversized circuitry to fit inside low-profile wall-mounted designs. Only Induction Dynamics’ wall-mounted speakers truly offer low-profile designs with performance that matches their full-sized, freestanding counterparts.

The S4X crossovers are overbuilt with the highest quality electrical components. Low saturation coils and low dissipation capacitors are designed to handle high power levels without heat buildup, ensuring consistent and reliable performance at any volume. Prior to installation, each crossover is quality control tested to within a 0.3% tolerance to ensure uniformity between individual speakers.

This innovative design also reduces space requirements which allows complex circuitry to fit inside on- and in-wall speakers. Experience Audio Perfection Realized™ from any combination of Induction Dynamics speakers.


Wide Angle® Technology

Crossover frequencies are inherently problematic because sound from two very different drivers must be added together harmoniously, on and off axis. Typical crossovers are optimized on-axis, but allow phase mis-alignment in the vertical off-axis response. Vertical phase mis-alignment results in a loss of sound quality when standing up or reclining.

The patented Wide Angle® Technology in the unique S4X™ crossover has the capability to completely align phase between drivers. By utilizing steep S4X slopes and Wide Angle Technology, the crossover limits driver interaction and optimizes phase in the off-axis region, generously widening the listening “sweet spot.” Experience consistent audio perfection – regardless of whether you’re sitting, lying down, or moving around the room.

Wide Angle Technology Induction Dyamics



3-Way/4-Way Defeatable Crossover Switch

iddFor extended bass response and greater sound pressure levels, the ID1 can be bi-amplified with a dedicated subwoofer amplifier. Although many loudspeakers feature simple bi-amp terminals for this purpose, the ID1 provides further control, which is what makes it so equally suited for both music and cinema.

For maximum versatility, the ID1 series features a defeatable low-end crossover switch that turns the subwoofer crossover on and off. The sealed high-current, 4-pole, cadmium plated switch gives the user three possible configurations:


1) 4-Way Passive
Looking to simplify things? Attach the provided terminal straps and plug in your full-range amplifier to the bottom set of terminals.
Induction Dynamics ID1 4 Way Passive

2) Passive Bi-Wire
This configuration leaves the internal crossover engaged, while giving you independent subwoofer control for better bass and transients… No external processing needed. Important: Make sure to remove the terminal straps in bi-wire mode!
Induction Dynamics ID1 Passive Bi Wire

3) Active Bi-Wire (Advanced)
To take full advantage of bi-amplification, the “3-way + subwoofer” configuration defeats the internal 80 Hz crossover completely. Remember – you will need to apply an active high-pass filter to your main amp, and an active low-pass filter to your subwoofer amp.
Induction Dynamics ID1 Active Bi Wire


Patented Subwoofer Processing

Non-realistic, “boomy” bass frequencies are so prevalent in the home theater world that some listeners have never heard a well-tuned subwoofer. The “boom” occurs because every subwoofer has a natural resonance peak-that is, every subwoofer will naturally produce a narrow range of low frequencies at a higher volume than the rest. This “boom” drowns out higher frequencies your subwoofer produces, resulting in diminished performance and muddy, poor-quality bass.

Induction Dynamics® engineers its subwoofers with high-performance drivers and specialized filter circuits to eliminate resonance peaks and produce a fuller sound expressing all bass frequencies.

Most subwoofers do not attempt to reproduce ultra-low frequencies because of the distortion created by excess excursion. Induction Dynamics® eliminates this distortion with a patented frequency-selective excursion limiter.

The excursion limiter allows the subwoofer to produce ultra-low frequency sound but prevents the driver from overexerting and causing distortion that could ruin your listening experience; the limiter itself is transparent, operating only at specific frequencies without audibly switching on and off.

See The Difference

You’ll hear the difference when the Induction Dynamics® subwoofer filter circuit removes the resonance peak and produces an even, smooth bass. Leave the BOOM behind and enjoy the true deep bass you were meant to hear.

Your Choice of Amplifier

Induction Dynamics® subwoofers have several amplification options. By using the external A2, you’ll be free to place our subs in tight areas with little ventilation (just make sure the A2 has room to breathe). The SW1, SW2, SW3, and SW4 models are also available with built-in A3 amplifiers, saving space for other equipment.

Industry-Leading Assembly & Quality Control Facilities

Induction Dynamics® owns and operates a state-of-the-art woodworking, painting and finishing plant in Lenexa, Kansas; keeping the facility close by assures the highest level of quality control throughout the numerous cabinet manufacturing and assembly processes. All raw materials used in constructing the speaker cabinets are the finest available and supplied by carefully chosen vendors. The cabinet fabricating process begins in the woodworking area where a highly sophisticated CNC machine cuts the many complicated composite and wood components with precision and repeatability (our larger speakers are made with a special lightweight material to keep down the overall weight). In the assembly area, skilled artisans hand assemble the hundreds of individual pieces and detail the cabinet for the next phase in the building process.

To build a rosewood cabinet, we hand select materials for the best, most consistent grain patterns. We then apply as many as twelve coats of finish and hand sand between each application. After polishing the outer surfaces to a rich, glossy finish, the rosewood cabinet is sent to the electronics installation facility.

To finish black gloss and black satin speakers, unfinished cabinets are sent to the painting area. There, artisans spray multiple coats on the cabinet. Black gloss speakers receive extra coats, and are polished to a glossy mirror finish.

Testing And Adjusting the Components

Induction Dynamics® owns its own cutting-edge electronics engineering, assembly and testing facility, operated under stringent quality control protocols. The electronics manufacturing process begins with the careful testing of all custom-built audio components; these components are hand-adjusted to a tolerance of 0.3% (typical industry tolerance is 5-10%). Extremely close tolerance of all electronic components assures high accuracy in the frequency response of the crossover, assuring audiophile-quality sound reproduction throughout the spectrum. During this process we also weed out any drivers that don’t perform within a narrow optimal range.

Final Assembly and Testing

The last assembly phase takes place at the electronics installation facility where skilled technicians install the electronics and drivers into the cabinet. After the final wiring is done, comprehensive performance testing is carried out under rigorous quality control conditions. After a final cleaning the speaker is carefully packaged and ready for shipping.

The level of dedication, skill and attention to every detail throughout the entire manufacturing, assembly and testing process results in a creation that is an elegant merger of aesthetics and technology-a beautiful and reliable speaker that is ready to entertain by delivering audiophile-quality sound for the ultimate home theater system. That’s why Induction Dynamics® is-Audio Perfection Realized™.


Patented Wall-Mounting Systems



By attaching directly to studs, our patented Stud-Grabber™ mounting system ensures that our in-wall speakers eliminate noisy vibrations while providing easy leveling and depth adjustment. Since the weight is carried by studs, your walls are protected from undue stress. Induction Dynamics®’ in-walls can be installed before or after drywall in new construction and existing homes.



Heavy-duty, one-piece aluminum boxes with patented rubber gasket suspension provide rigid enclosures with ideal air volume for audiophile quality sound. Boxes are made with 8 gauge aluminum, combining high strength with low weight.




The movement of heavy in-wall subwoofer drivers can cause vibrations that will ultimately damage drywall. To prevent this, Induction Dynamics® developed and patented a spring suspension that incorporates special springs, supplementing the rubber gasket and enabling it to handle the strong motion of heavy subwoofer drivers.



List of MSE Audio Patents

Balanced cantilever spring bracket

Designed to hold a Solid Drive against a vertical surface such as dry wall, so there is no stress on the glue joint. The drive is cantilevered to keep it balanced on the center line of the bracket, thus eliminating any twisting force on the glue joint.

Sound transducer for solid surfaces

Powerful transducer with two opposed motors turns solid surfaces into high-quality sound radiators. The transducer has very low distortion due to its axial shaft suspension, which includes spider bearing at each end of the shaft.

Excursion limiter

This limiter operates around a selected frequency of maximum excursion in a subwoofer, and does not affect other frequencies. The limiter responds faster than the rise time of a subwoofer driver, so there is effectively no delay. Amplitude is reduced smoothly, so the operation of limiter does not create audible distortion.

Speaker grille frame

A special manufacturing process is used create openings in a wood grille frame. The openings allow some of the sound running along the face of a speaker to go through the frame, thus reducing undesirable reflections.

Coaxial speaker with step-down ledge to eliminate sound wave distortions and time delay

Used on a coaxial speaker having a large circular baffle around the tweeter that is attached to the frame or magnet structure of the speaker. A step down ledge is created on the circular baffle, forcing a diffraction of some of the high frequencies, which are then reflected away from the woofer cone, thus reducing undesirable reflections, delays and Doppler distortion coming off of the woofer cone.

Speaker enclosure and mounting method for isolating and insulating faceplate and heavy speakers from surrounding mounting surface

This is an enhancement to patent number 6,415,886 below, ”In-wall speaker mounting apparatus”. Steel springs are placed around the stand offs in the back box to beef up the suspension for face plates containing heavy speakers, such as subwoofer drivers.

Speaker mounting device

Corner mounting bracket for box speakers that has mounting holes aligned to facilitate screwing into typical corner stud configurations at the proper location and angle. The speaker can be installed or removed without removing the bracket.

In-wall speaker mounting apparatus

Metal back boxes can be attached directly to studs using special fasteners called “stud grabbers” that can be adjusted and attached from inside the box. The speaker faceplate is then attached to stand offs in the back box and suspended on a large rubber gasket that is attached to the front of the back box. Neither the back box nor the face plate are in contact with the dry wall.

Attachment fixture for the front panel and grill of a speaker assembly

Dual purpose fasteners are used to 1) attach removable face plates to speakers, and 2) attach grilles to the same face plates.

Audio crossover circuit

Coils in a 3-pole or 4-pole low-pass circuit are coupled together to produce an extra-steep slope. This is especially useful with many drivers that have either a frequency response curve or impedance curve that works against achieving the desired slope and phase. The circuit is more compact than a normal 3-pole or 4-pole low pass because two coils share the same location on the circuit board.