Shaker & Sound

Shaker motors and sound systems change the gaming experience in different ways

A shaker motor for pinball machines does not produce music and does not replace a speaker. Its purpose is to transmit selected game situations as mechanical vibrations to the cabinet. To do this, an electric motor with an eccentrically mounted weight is activated inside the pinball cabinet. As soon as the game software sends a corresponding signal, the motor causes the cabinet to vibrate in a controlled manner.

This haptic feedback can make explosions, engine noises, earthquakes, monster movements, rocket launches, or particularly important hits physically perceptible. The result is not constant shaking, but a targeted effect synchronized with the respective game situation. Well-tuned shaker effects enhance a pinball machine’s theme without altering the actual gameplay.

A pinball sound system, on the other hand, operates on an acoustic level. High-quality speakers, midrange drivers, tweeters, and woofers can reproduce voices more clearly, make music sound more spatial, and give low frequencies significantly more presence. Pinball machines with extensive music tracks, movie samples, or detailed voice announcements benefit particularly from a well-balanced speaker upgrade.

The shaker motor and sound system thus fulfill two independent functions. The shaker makes certain events physically felt, while the sound system improves the acoustic reproduction. Both upgrades can be used individually. However, when combined, they create a particularly intense gaming experience, as sound effects and vibration are perceived simultaneously.

The PU parts category includes compatible shaker motor kits for Stern SAM and Stern SPIKE systems, as well as for machines from Jersey Jack Pinball. In the sound category, options include Flipper Fidelity systems for Stern WhiteStar, SAM, SPIKE 1, and SPIKE 2, as well as for several generations of Williams WPC machines, System 11, and Data East pinball machines. This allows for targeted acoustic upgrades to both modern machines and numerous classics.

Workshop Tip:

Before purchasing a shaker motor, check whether your pinball model supports the shaker effect via software and which cable set or connector is required for the installed system. A mechanically compatible motor alone does not guarantee proper control.

Selecting the Right Sound System for Your Pinball Machine

When upgrading speakers, you shouldn’t focus solely on maximum power output. It’s crucial that the speakers, frequency response, impedance, and installation position are compatible with the pinball machine’s existing audio system. Therefore, just any speaker with the right dimensions isn’t automatically a suitable upgrade.

Many pinball machines use multiple speakers in different frequency ranges. The backbox often contains speakers for mid and high frequencies, while a larger woofer in the cabinet handles the low-frequency range. Only the interaction of these components produces a balanced sound. If just a single speaker is replaced with an unsuitable model, voices may sound unnatural, high frequencies may become too sharp, or low frequencies may lose precision.

Complete sound systems for pinball machines are therefore usually tailored to a specific platform. The PU parts lineup, for example, includes various Pinball Fidelity systems for Williams WPC Alpha Numeric, WPC-93/DCS, WPC-95, and System 11B/C. In addition, there are solutions for Data East as well as for Stern WhiteStar, SAM, SPIKE 1, and SPIKE 2. Depending on the system, variants with 8-inch or 10-inch woofers and various multi-way configurations are available.

The system generation is particularly important when making a selection. Williams WPC machines have different installation specifications and audio configurations than Stern SPIKE pinball machines. Furthermore, a Stern SAM sound system is not automatically compatible with SPIKE 1 or SPIKE 2. Filters by system, model, and machine variant therefore help narrow down the selection.

A high-quality sound upgrade can address several common shortcomings. These include unclear voice output, weak bass, little distinction between music and sound effects, or an overall flat soundstage. Especially with machines featuring sophisticated sound design, this makes details audible that are barely noticeable through the stock speaker system.

However, more bass isn’t automatically better. An excessively powerful or poorly decoupled woofer can cause the cabinet, back box, window, or loose components to vibrate along with it. This results in rumbling, rattling, or annoying resonances. That’s why checking the mountings and ensuring proper mechanical decoupling are always part of a professional sound upgrade.

Workshop Tip:

Test a new sound system not only with music, but also with voice announcements, short sound effects, and low frequencies. Rattling noises often occur only at certain pitches or volume levels and go unnoticed during a quick functional test.

Properly Distinguishing Between Annoying Vibrations, Rumbling, and Rattling Noises

Vibrations are expressly desired in a shaker motor. Noises caused by loose components, resonating speaker grilles, or poorly decoupled woofers, on the other hand, are undesirable side effects. These two phenomena are often confused with one another in everyday use, even though their causes and solutions differ.

A properly mounted shaker motor produces controlled movement of the cabinet. The motor must not come into contact with cables, wooden surfaces, or other components. The mounting must be secure, as loose screws can transform the intended vibration into irregular thumping or metallic rattling. It is therefore recommended to recheck the mounting after the first few hours of operation.

Disturbing noises during sound operation often originate from speaker grilles, backbox components, bezels, cables, or components that are not sufficiently secured. Low frequencies cause these components to resonate. The problem is not necessarily the speaker itself, but rather a resonance point within the unit.

Anti-rattle tape, foam pads, or suitable anti-vibration rings can decouple such contact points. The product range includes, among other items, anti-rattle tape for pinball machines, an anti-vibration ring for Stern standard speakers, and foam for Stern SPIKE-2 speaker grilles. These parts are not intended to increase the volume, but rather to ensure proper mechanical mounting and prevent disruptive background noise.

Before replacing a speaker, you should therefore first check the cause. A rattling noise can be caused by a damaged speaker cone, but also by a loose grille, a vibrating cable, or an insufficiently secured backbox panel. A systematic diagnosis prevents an intact speaker from being replaced unnecessarily.

To troubleshoot, slowly increase the volume while playing various music tracks, voices, and sound effects. If the noise occurs only at certain low frequencies, carefully check the cabinet and backbox for resonances. Applying light manual pressure to suspicious components can reveal whether the rattling changes as a result. Before working on the interior, the pinball machine must, of course, be turned off and unplugged from the power source.

Workshop Tip:

A rumbling noise cannot be reliably assessed by further increasing the volume. Begin the diagnosis at a medium volume and check fasteners, grilles, cables, and cabinet contacts one by one. This usually allows you to quickly narrow down the actual source of the resonance.

Properly Checking Compatibility of Shaker Kits and Sound Systems

Before purchasing a shaker motor for pinball machines or a new sound system, you should always check which electronic system your pinball machine is equipped with. While many replacement parts can be used across different manufacturers, shaker kits and audio upgrades are often tailored precisely to specific platforms. Differences exist not only between manufacturers but often even between individual generations of machines from the same manufacturer.

Stern Pinball, for example, uses various hardware platforms such as WhiteStar, SAM, SPIKE, SPIKE 2, or the current SPIKE 3 generation. Although many machines look similar on the outside, their control boards, connectivity options, and software functions can differ significantly in some cases. A shaker kit for a SPIKE 2 machine is therefore not automatically compatible with an older SAM pinball machine.

Classic Williams pinball machines also differ significantly from one another. Machines with System 11, WPC Alpha Numeric, WPC-89, WPC-95, or DCS feature different audio architectures and speaker configurations. Anyone looking to modernize their sound system should therefore always ensure that the speakers, woofers, and, if applicable, crossovers have been specifically designed for the respective system.

Jersey Jack Pinball, on the other hand, relies on a completely different platform with its own audio and control technology. Here, too, special shaker kits and accessories are required that are precisely tailored to these machines. The same applies to many older pinball machines from Data East, Sega, or Gottlieb, whose speaker sizes, mounting points, and connections sometimes differ significantly from one another.

In addition to the electronic system, the machine’s model also plays a role. Many current Stern pinball machines are released as Pro, Premium, or Limited Edition models. Depending on the model, speaker grilles, speaker sizes, or standard components may differ. A quick glance at the model name, year of manufacture, and system will save you a lot of time later when selecting the right accessories.

🔧 Workshop Tip:

Always note down the manufacturer, model, year of manufacture, and system generation of your pinball machine before making a purchase. In most cases, these four pieces of information are sufficient to unambiguously select the right Shaker kit or sound system.

More Than Just Sound—Accessories for Comfort and Customization

A modern sound upgrade is no longer limited to just new speakers or a more powerful woofer. Many owners enhance their pinball machines with practical components that make daily use more comfortable while also giving the machine a unique look. This creates a complete package that goes far beyond mere sound improvement.

External volume controls are a frequently added accessory. Especially in private game rooms or apartment buildings, they allow you to conveniently adjust the volume without having to open the coin door or access the service menu every time. This significantly increases ease of use, particularly during changing gameplay situations or at different times of day.

Headphone jacks for pinball machines are equally popular. They enable an immersive gaming experience without disturbing roommates or neighbors. At the same time, all music tracks, voice prompts, and sound effects are preserved in full quality. For many owners, this is an ideal solution for longer gaming sessions in the evening.

Speaker lighting and themed speaker acrylics are also very popular. They visually integrate the front speakers with the design of the respective pinball machine and create impressive lighting accents during gameplay. Modern Stern pinball machines, in particular, benefit from these subtle yet effective enhancements, which blend harmoniously into the overall look.

In addition to visual enhancements, small technical additions can also make a big difference. Anti-vibration rings, foam inserts, or anti-rattle solutions reduce resonance and prevent distracting background noise. This not only improves the sound but also makes the overall experience of the machine feel higher-quality and more precise.

🔧 Workshop Tip:

If you’re installing multiple sound upgrades at the same time, test each component individually. This way, you can clearly determine later which change had what effect on sound, vibrations, or lighting.

Shaker & Sound – Small Changes with a Big Impact

Hardly any other category changes the pinball machine’s gameplay experience as significantly as a high-quality shaker or sound upgrade. While the shaker motor makes key game situations physically palpable, high-performance speakers and woofers ensure clearer music playback, more precise voice announcements, and powerful bass. Complementary components such as speaker lighting, external volume controls, headphone jacks, or anti-vibration solutions effectively round out the overall concept.

Whether you’re restoring a classic Williams pinball machine, modernizing a Data-East classic, or further enhancing a current Stern pinball machine with the SPIKE system—with the right components, you can specifically improve the sound and gameplay experience without altering the machine’s original character. The key is always to select high-quality, precisely fitting products that are perfectly tailored to the specific system.

At PU parts, you’ll find a wide selection of shaker kits, sound systems, speakers, woofers, speaker lights, external volume controls, headphone jacks, and other accessories for numerous pinball machines from various manufacturers. This allows you not only to enhance your pinball machine visually and acoustically but also to take the entire gaming experience to a whole new level.

Frequently Asked Questions About Pinball Shaker Kits & Sound Upgrades