ReSound Key 398 SP BTE: High-Output Power and Reliable Clarity

The ReSound Key 398 Super Power (SP) is a high-gain, Behind-the-Ear (BTE) hearing aid designed for individuals with severe-to-profound hearing loss. When your hearing loss requires significant amplification, you need a device that provides volume without distortion. The Key 398 delivers exactly that—powerful, clear audio built on ReSound’s proven C5 processing chip.

As part of the Key 3-series, this model offers “Essential Plus” technology. It provides the necessary tools to navigate both quiet and moderately noisy environments with ease, all while keeping you connected to your favorite digital devices.

1. Engineered for Severe Hearing Challenges

For users with profound hearing loss, standard hearing aids often fall short. The Key 398 SP is built with a larger, more robust speaker and a dedicated amplifier to ensure sounds are audible and speech is intelligible.

• 10-Channel Tuning: With 10 digital channels, your hearing professional can precisely adjust the device to your unique audiogram. This ensures that you get the most amplification where you need it most.

• Size 675 Battery: Powering a high-gain device requires a large energy source. The 398 uses the Size 675 battery, ensuring long-lasting performance even with heavy daily use and Bluetooth streaming.

• DFS Ultra II: Feedback (whistling) is a common problem in high-power aids. ReSound’s advanced suppression system eliminates whistling before it reaches your ear, providing a smooth listening experience.

2. Modern Connectivity and App Control

Despite being a “Super Power” workhorse, the Key 398 is highly intelligent. It features 2.4 GHz Bluetooth connectivity, allowing you to live a fully connected life.

• Direct Streaming: Enjoy phone calls, music, and podcasts streamed directly from your iPhone or compatible Android (ASHA) device.

• ReSound Smart 3D App: No more struggling with tiny buttons. You can change volume, adjust treble/bass, and switch programs directly from your smartphone screen.

• Built-in Telecoil: The 398 includes a Telecoil as standard, allowing you to connect to loop systems in theaters, churches, and community centers for crystal-clear audio.

3. Built for Everyday Durability

The ReSound Key 398 is designed to be as tough as it is powerful. It features an IP68 rating, meaning it is dust-tight and highly resistant to water. Every component is coated with iSolate nanotech, a microscopic shield that repels moisture, sweat, and earwax, extending the life of your investment.

ReSound Key 398 SP BTE: Technical Specifications

The ReSound Key 398 (Model: KE398-DW) is the mid-tier “Super Power” Behind-the-Ear hearing aid. It uses the Size 675 battery to provide the massive amplification needed for severe to profound hearing loss while offering the smart connectivity of the C5 processing platform.

1. Power & Output Levels

• Fitting Range: 60 dB – 120 dB (Designed for Severe to Profound loss).

• Peak Gain: 86 dB (Ear Simulator) / 83 dB (2cc Coupler).

• Maximum Output (OSPL90): 144 dB SPL (Ear Simulator) / 141 dB SPL (2cc Coupler).

• Frequency Range: 100 Hz – 5200 Hz.

2. Digital Signal Processing (Level 3 – Essential Plus)

• Channels: 10 Warp Processing Channels / 10 Gain Bands.

• Processing Chip: C5 Chip (High-speed sound processing).

• Feedback Management: DFS Ultra II (Eliminates whistling and squealing).

• Noise Reduction: NoiseTracker II (Reduces background noise for speech comfort).

• Directional System: Adaptive Directionality (Helps you focus on speech in front of you).

• Wind Guard: Protects against annoying wind noise during outdoor activities.

• Expansion: Quiets very soft environmental sounds (like a humming fridge).

3. Connectivity & Wireless Features

• Bluetooth Technology: 2.4 GHz Bluetooth Low Energy.

• Direct Streaming: Made for iPhone (MFi) and Android (ASHA) compatible.

• App Control: Fully compatible with the ReSound Smart 3D App.

• Wireless Accessories: Works with ReSound TV Streamer 2, Multi Mic, Micro Mic, and Remote Control 2.

Frequently Asked Questions (FAQ)

Who is the ReSound Key 398 best for?

The Key 398 is specifically for individuals with severe-to-profound hearing loss who need a “Super Power” BTE device. It is ideal for those who want smartphone connectivity and great sound quality at an affordable price.

Does the Key 398 support Android streaming?

Yes. The ReSound Key 398 supports the ASHA (Audio Streaming for Hearing Aids) protocol, allowing direct streaming from compatible Android smartphones as well as Apple iOS devices.

How long does the battery last?

Since the Key 398 uses the large Size 675 battery, you can expect approximately 9 to 12 days of use, depending on how many hours you spend streaming audio via Bluetooth.

Is the ReSound Key 398 waterproof?

It has an IP68 rating, which is the highest water-resistance rating for hearing aids. While it can handle rain, sweat, and accidental splashes, it should not be worn while swimming or showering.

What is the difference between the 398 and 498?

The Key 498 offers 12 channels and more advanced noise reduction. The Key 398 offers 10 channels, making it a more budget-friendly option while still providing excellent power and connectivity.