AudioLineOut Recalls Studio Six Headphone Amplifiers Due to Risk of Serious Injury or Death from Electrocution Hazard

What was recalled

The hazard, explained

At the heart of this recall is a specific interaction between the AudioLineOut Studio Six headphone amplifier and aftermarket metal base tubes that some users choose to install for aesthetic or structural reasons. While the amplifier itself is designed with internal safety standards, the introduction of these third-party metal components changes the electrical landscape of the device in a dangerous way. The core issue is that the bare metal of these aftermarket bases can become electrified when the unit is powered on. In normal operation, the metal chassis of electronic devices is often grounded to prevent current from flowing through unintended paths. However, when an ungrounded or improperly grounded metal base tube is used, it can inadvertently bridge internal electrical connections to the exterior surface of the equipment.

This creates what engineers call an "electrocution hazard." Essentially, the outer shell of your amplifier, which you touch regularly while adjusting knobs or placing headphones, becomes live with electricity. If you are touching this electrified metal surface and are also in contact with a grounded object—such as a water pipe, a metal appliance, or even a damp floor—a circuit can be completed through your body. This allows electrical current to flow through you rather than staying within the device’s intended pathways. The result is not just a minor static shock, but a potentially severe electric shock that can cause serious injury or death depending on the voltage and duration of contact.

It is important to understand why this happens specifically with aftermarket tubes. The original design of the Studio Six amplifier relies on specific materials and clearances to keep electrical components safely isolated from surfaces you might touch. Aftermarket metal base tubes are not manufactured to the same specifications as the original equipment manufacturer (OEM) parts. They may lack proper insulation, grounding wires, or the correct physical spacing required to prevent arcing or leakage current. Because these tubes are made by third parties who do not adhere to the same rigorous safety testing protocols as AudioLineOut, they introduce a vulnerability that simply does not exist when using the factory-supplied vacuum tubes.

You might wonder if this is a common issue with audio equipment. While many high-end amplifiers allow for tube rolling or customization, adding conductive metal parts to the exterior without proper grounding is a known risk in electronics safety. The danger is particularly insidious because the hazard is not always visible or audible. There may be no warning signs before contact is made. For users who frequently adjust their headphone setups or handle the unit with bare hands, the risk of accidental contact with an electrified surface is real and immediate. This is why the Consumer Product Safety Commission (CPSC) has deemed this a Class I recall, indicating the highest level of urgency due to the potential for serious injury or death.

Who is most at risk

The primary group at risk for this recall consists of audiophiles, home theater enthusiasts, and professional audio engineers who own the AudioLineOut Studio Six Headphone Amplifier (Model ST6). These are typically individuals who have invested in high-fidelity audio equipment to enhance their listening experience. The specific danger arises not from the amplifier itself under normal conditions, but from a particular modification: the use of aftermarket metal base tubes with the vacuum tubes installed in the unit. If you have replaced the original glass vacuum tubes with metal ones that rest on or interact with the metal base of the amplifier, you are in the affected group. The risk is not limited to professional studios; it extends to any home user who has customized their device with these specific aftermarket components.

While the CPSC reports no incidents to date, the potential for serious injury or death from electrocution means that anyone using this modified setup is in a high-stakes safety zone. The vulnerability here is primarily physical rather than demographic in the traditional sense of age or health status. However, we can look at who might be less likely to detect the hazard or more susceptible to its consequences. For instance, individuals who are deeply immersed in their hobby may become accustomed to the normal hum and warmth of tube amplifiers, potentially overlooking subtle changes in behavior or safety indicators. The "bystander" risk is also present; family members or guests who might touch the amplifier while it is plugged in and operating could be unaware that the metal base has become electrified due to the aftermarket modification.

Elderly individuals or those with certain medical conditions, such as those relying on pacemakers or other implanted electronic devices, face heightened risks if they come into contact with the energized chassis. Although the recall does not specify age-based vulnerabilities, the general principle of electrical safety dictates that any person who is barefoot, standing on a conductive surface like tile or concrete, or touching grounded appliances (like a refrigerator or sink) while handling the recalled amplifier faces a significantly increased chance of severe electric shock. The hazard is immediate and unpredictable; it does not require a malfunction to activate, only the presence of the specific aftermarket metal base tubes. Therefore, the "most at risk" group is anyone who has physically altered their ST6 unit with these parts, regardless of their technical expertise or location. It is crucial to recognize that this is a latent hazard—it exists as long as the incorrect tubes are installed and the device is powered on.

Additionally, households with children should exercise extreme caution. While children are unlikely to be modifying vacuum tubes themselves, they may approach an unattended amplifier in a living room or studio space. If the amplifier has been modified with the hazardous aftermarket parts, it becomes an unpredictable electrical danger point. Parents and guardians must ensure that any high-end audio equipment in their home is inspected immediately if modifications have been made. The risk here is accidental contact rather than intentional use, making parental vigilance a critical factor in preventing injury.

Ultimately, the scope of risk is defined by ownership and modification status. If you possess a black or silver AudioLineOut Studio Six Headphone Amplifier (Model ST6) measuring 15-3/4 inches high by 12 inches wide, and you have installed aftermarket metal base tubes, you are directly in the path of this hazard. The absence of reported incidents is reassuring but not definitive proof of safety; it simply means no one has been hurt yet. Do not wait for an incident to occur. Recognize that your specific configuration places you at risk, and take immediate steps to disconnect the device from power until you can arrange for a free repair or revert to the original glass vacuum tubes.

How to tell if you have the recalled item

If you own an AudioLineOut headphone amplifier, taking a few minutes to verify whether your specific unit is part of this recall is the most important step you can take to ensure your safety. Because the hazard involves a potential electrocution risk when using aftermarket metal base tubes, it is critical that you confirm exactly which model you possess before making any changes to its setup or continuing regular use. The Consumer Product Safety Commission (CPSC) has identified only one specific product line under this notice: the AudioLineOut Studio Six Headphone Amplifier. If your device bears a different brand name or belongs to a different series, it is not included in this recall, though you should always consult official safety notices for any electronic equipment.

To begin your identification process, look at the physical characteristics of your amplifier. The recalled units are available in two distinct finish options: black or silver. These are desktop amplifiers with a substantial footprint and height, designed to accommodate multiple headphone connections. You can identify the correct model by measuring the unit. The full height of the device is 15-3/4 inches, while its width measures 12 inches. It features a two-tiered design. For the lower level, measure from top to bottom; this section should be exactly 5-3/4 inches high. If you measure from the very top of the upper level down to the bottom of the entire unit, the total height is 20-3/4 inches. These dimensions are specific to the Studio Six design and will help distinguish it from other AudioLineOut products.

Next, examine the connectivity ports on the front and back of the device to confirm its function and model. On the front panel, you should see four audio connectors designated for headphones. This multi-headphone capability is a key feature of the Studio Six. Turn the unit around to inspect the rear panel. You will find three sets of RCA inputs labeled for Left (L) and Right (R) channels. Additionally, there must be a connector port designed for an auxiliary power device. If your amplifier lacks any of these specific input configurations or has a different number of headphone jacks, it is likely not the recalled model.

The most definitive way to confirm if your unit is affected is to check the model number printed on the device itself. Look for the label "ST6" on the chassis. This model designation applies to all recalled Studio Six Headphone Amplifiers regardless of whether they are black or silver. If you cannot find the model number easily, or if you have modified the unit with third-party accessories such as metal base tubes, do not attempt to guess its status. Instead, contact AudioLineOut directly for assistance in verification.

If you determine that your amplifier matches these descriptions—specifically the ST6 model—you should treat it as potentially hazardous until the free repair is completed. Do not rely solely on appearance if you are unsure; when in doubt, reach out to the manufacturer’s safety team. They can help you confirm whether your serial number or specific configuration falls within the recall scope. Remember, the risk arises specifically from the interaction between the amplifier and aftermarket metal base tubes, so even if you do not currently have such a tube installed, it is safer to pause use and seek the official remedy provided.

What to do — step by step

If you own a Studio Six Headphone Amplifier that matches the description below, your immediate priority is to ensure safety. The Consumer Product Safety Commission (CPSC) has identified a serious risk of electrocution when these specific units are paired with aftermarket metal base tubes. Because bare metal can become electrified in this configuration, the danger is real and potentially fatal. Therefore, the first and most critical step you must take is to stop using the recalled amplifier immediately. Do not plug it in, do not use it for listening, and do not attempt to troubleshoot the issue yourself. Your safety depends on removing the power source from the equation entirely until the official remedy is completed.

Once you have safely disconnected the unit, you need to initiate the repair process through AudioLineOut. The company has established a dedicated channel for handling this recall, offering free repairs for all affected devices. To begin, you should contact AudioLineOut directly. You can reach their support team by email at support@aloaudio.com or by phone at 971-279-4357. Their customer service representatives are available from 8 a.m. to 5 p.m. Pacific Time, Monday through Friday. When you contact them, clearly state that you own a Studio Six Headphone Amplifier (Model ST6) and wish to participate in the safety recall. They will assist you in verifying your unit’s eligibility and providing the necessary instructions for the next steps.

After you have made initial contact, AudioLineOut will provide you with a prepaid shipping label. This is a crucial part of the process because it ensures that you do not incur any costs for returning the defective product. You should pack your amplifier securely in its original box if possible, or use sturdy packaging to protect the unit during transit. Once packed, attach the provided shipping label and send the device back to AudioLineOut for repair. They will handle the technical fixes required to resolve the electrification hazard at no charge to you.

In the meantime, while you are waiting for your repaired unit to return, there is an alternative way to use your amplifier safely. The recall notice indicates that consumers can utilize the originally supplied vacuum tubes. If you still have these original components and they are compatible with your setup, using them may allow you to continue using the device without the risk associated with aftermarket metal base tubes. However, this is a temporary workaround, not a permanent solution. The official remedy remains the free repair provided by the manufacturer. Avoid purchasing or installing any new aftermarket metal bases until the recall process is fully resolved.

If you prefer to handle your request online, you can visit AudioLineOut’s dedicated safety notice page. Here, you will find a contact form specifically designed for this recall. This digital option is often the fastest way to get your prepaid shipping label and confirmation of your repair status. Whether you choose to call, email, or fill out the online form, keep a record of your communication dates and any case numbers provided by AudioLineOut.

Remember, this process is designed to be straightforward and cost-free for you. The manufacturer recognizes the severity of the electrocution risk and has taken full responsibility for correcting it. By following these steps—stopping use, contacting support, shipping the unit via the prepaid label, and awaiting the free repair—you are taking all the necessary actions to protect yourself and your household from harm.

Your refund, repair, or replacement options

If you own a Studio Six Headphone Amplifier that matches the details of this recall, your first priority is to stop using the device immediately. The good news is that AudioLineOut has established a straightforward and cost-free remedy to resolve the safety issue. They are not asking you to buy a new unit or pay for shipping; instead, they have committed to repairing your specific amplifier at no charge. This approach ensures that you do not lose the use of your equipment while maintaining your safety.

To begin the process, you need to reach out to AudioLineOut directly. You can contact their support team via email at support@aloaudio.com or by calling 971-279-4357. When making contact, please note that their phone lines are open from 8 a.m. to 5 p.m. Pacific Time, Monday through Friday. It is helpful to have your model number (ST6) and the color of your unit (black or silver) ready when you speak with them, as this will help them locate your purchase record quickly.

Once you have contacted AudioLineOut, they will provide you with a prepaid shipping label. This is a crucial detail because it means you do not have to pay for the return shipment of the potentially hazardous item. You should place the amplifier in its original packaging if possible, or ensure it is well-padded in a sturdy box to prevent further damage during transit. Attach the provided label clearly to the outside of the package and drop it off at the designated carrier location.

In addition to waiting for the professional repair, AudioLineOut offers an immediate alternative that you can try right now. If you still have the originally supplied vacuum tubes that came with your amplifier, you can install those in place of any aftermarket metal base tubes. The recall specifically notes that the danger arises when amplifiers are used with aftermarket metal base tubes, which can become electrified. By reverting to the original, non-metal components, you may be able to use the device safely while you wait for your repaired unit to return. However, if you do not have the original tubes or are unsure about their condition, it is best to rely on the official repair service.

For those who prefer to handle everything online, AudioLineOut has set up a dedicated safety notice page. You can visit https://aloaudio.com/ and click on “Safety Notice,” or go directly to https://aloaudio.com/pages/studio-six-headphone-amplifier-safety-recall to fill out a contact form. This digital option is often the fastest way to initiate the repair process, as it creates an immediate record of your request. Remember, the goal here is safety first, and the company has made the logistics as simple as possible so you can focus on what matters most: keeping yourself and your household safe from electrocution risks.

What can happen if you ignore it

When you see a recall notice for an electrical device, it is easy to feel like the warning is just bureaucratic red tape, especially if the product has been sitting quietly in your home or studio for months without issue. However, with the AudioLineOut Studio Six Headphone Amplifiers, ignoring this alert carries a risk that is fundamentally different from a simple malfunction or a degraded audio quality. The core issue here is not about sound fidelity; it is about basic electrical insulation and the integrity of the chassis grounding. If you continue to use these amplifiers with aftermarket metal base tubes, you are essentially leaving a live electrical connection exposed to touch.

The specific danger lies in the interaction between the amplifier’s internal components and the conductive nature of the unauthorized metal bases. These aftermarket tubes can create a path for electricity to travel from the internal circuitry to the outer shell of the device. Under normal circumstances, the chassis is designed to be safe to touch because it is properly grounded. However, when the bare metal of these specific aftermarket bases comes into contact with energized parts, that entire external surface can become electrified. This means that any part of your body that touches the amplifier—your hands while adjusting knobs, your arms resting on the unit, or even your legs if you are seated close by—could complete a circuit to the ground.

The consequence of this completed circuit is electrocution. The CPSC has classified this hazard as posing a risk of serious injury or death. This is not an exaggeration based on theoretical physics; it is a recognition that household voltage, when uncontrolled and directed through a human body, can disrupt the heart’s electrical rhythm (ventricular fibrillation) or cause severe thermal burns to tissue. While the agency notes that no incidents have been reported as of the recall date in August 2026, the absence of reported injuries does not mean the risk is absent. It simply means that luck has held so far. Electricity does not discriminate; it will exploit any gap in insulation or grounding protocol.

Furthermore, continuing to use the device creates a secondary risk of fire. An electrical arc between the bare metal base and a grounded object can generate significant heat. In a home environment, where the amplifier might be placed near curtains, wooden furniture, or other flammable materials, this heat buildup could potentially ignite a fire, expanding the danger from personal injury to property damage and broader household safety threats. The silence of the device while it is plugged in does not indicate safety; it often indicates that the fault is dormant until the moment of contact. By ignoring the recall, you are gambling with your physical safety on a mechanism that is known to be flawed.

It is also worth noting that using the originally supplied vacuum tubes mitigates this specific risk because they do not create the same conductive bridge as the metal bases. If you have switched back to the original tubes, the immediate electrocution hazard described above is removed. However, if you are still using the aftermarket metal bases, the device remains a latent danger. The only way to fully resolve this uncertainty and ensure your equipment is safe for long-term use is to follow the manufacturer’s remedy. Ignoring the recall leaves you in a state of unverified risk, where a simple touch could have catastrophic results.

Staying safe: broader tips

While this specific recall addresses a unique interaction between headphone amplifiers and aftermarket metal components, the underlying principle applies to many high-end audio and electronic devices found in our homes. The core lesson here is vigilance regarding modifications. Manufacturers design equipment with precise electrical clearances and grounding protocols in mind. When you introduce third-party parts—especially conductive materials like metal—that were not vetted by the original engineering team, you risk bypassing safety features or creating unintended pathways for electricity. Always prioritize components that are certified by the original manufacturer or come from reputable suppliers who specialize in compatible accessories. If a modification seems too good to be true, or if it voids your warranty, it is often worth pausing to consider whether the potential safety compromise is worth the aesthetic or functional gain.

Beyond avoiding unauthorized modifications, regular maintenance of your power infrastructure is essential for preventing electrical hazards. Ensure that all power cords connected to your audio equipment are in good condition, free from fraying, cracking, or exposed wires. Use surge protectors that have been recently tested and certified by a recognized laboratory. It is also wise to periodically check the grounding pins on your plugs; if a plug feels loose in the outlet, the connection may be unstable, leading to arcing or overheating. Never force a plug into an outlet that does not accept it naturally, and avoid using extension cords as permanent solutions for high-draw devices, as this can lead to overheating at the connection points.

Finally, stay informed about product safety through official channels. The Consumer Product Safety Commission (CPSC) maintains a robust database of recalls that affects millions of households annually. Subscribing to their email alerts or visiting their website regularly can help you identify issues before they result in injury. Additionally, register your new electronics with the manufacturers whenever possible. This not only helps you receive warranty support but also ensures that if a safety defect is discovered later, you will be contacted directly so you can take action promptly. Being proactive about these small steps creates a much safer living environment for you and your family.