Product Overview

The L4-IF is a 4 channel digital hearing aid developed for hearing aid distributors, audiology clinics, hearing centers, medical device importers and professional hearing care organizations that need a clearly defined baseline model for technical evaluation and portfolio planning.

Built on the ACOD2101 intelligent multi-core DSP platform, the model provides 4 independently adjustable compression and amplification channels, 8 independently adjustable bands and 16 DSP channels. ERAC 1.0 Context Analysis Based Intelligent Multi-Compression Technology with a Dual-Knee structure provides the compression foundation.

Feedback management is provided by AFC 2.0 Adaptive Feedback Cancellation with 2 levels together with SIW technology. ENDR 1.0 Environment Detection and Noise Reduction is specified at up to 15 dB. Environment Recognition, Transient Noise Management and Wind Noise Management are not included at this configuration level.

For B2B buyers, L4-IF serves as the reference point for the L-IF family. Its value is based on a concise specification that makes it straightforward to compare fitting capacity, electroacoustic data and operating functions against the higher models.

Electroacoustic Benchmark for Product Evaluation

The L4-IF provides a documented electroacoustic profile that can be used as a baseline during sample assessment and procurement review.

Maximum OSPL90 is 110 dB and HFA OSPL90 is 105 dB. Maximum FOG50 is 35 dB, while HFA FOG50 is 29 dB. RTG Target and RTG Measured are both specified at 29 dB.

Additional values include a frequency range of 200–5000 Hz, battery current of 1.2 mA and EQ of 25 dB. THD at 500 Hz, 800 Hz and 1600 Hz is specified at 3%.

For distributors, these figures provide concrete data for specification sheets, quotations and sample comparison. For clinics and hearing centers, the same values can be reviewed alongside fitting-channel and DSP capacity.

For buyers evaluating a 4 channel digital hearing aid, this electroacoustic benchmark helps establish a consistent starting point before considering the larger fitting structures and additional processing functions available in L8-IF, L12-IF and L16-IF.

4 / 8 / 16 Fitting Baseline

The model uses a straightforward three-part configuration:

• 4 independently adjustable compression and amplification channels
• 8 independently adjustable bands
• 16 DSP channels

This 4 / 8 / 16 structure gives professional fitting teams defined adjustment points while keeping the product easy to position within a multi-model portfolio.

The ACOD2101 DSP platform supports the fitting architecture, while ERAC 1.0 Multi-Compression Technology with a Dual-Knee structure provides the compression framework.

For distributors, the numerical structure is particularly useful in product training. L8-IF expands the architecture to 8 / 16 / 32, L12-IF moves to 12 / 24 / 48 together with Standard Environment Recognition, and L16-IF reaches 16 / 32 / 64.

This makes the 4 channel digital hearing aid a practical baseline SKU for buyers that want a clear specification ladder rather than overlapping models with unclear roles.

Basic Feedback and Noise-Reduction Platform

L4-IF uses AFC 2.0 Adaptive Feedback Cancellation with 2 levels. SIW technology is included.

ENDR 1.0 is specified at up to 15 dB. The model does not include Environment Recognition, Transient Noise Management or Wind Noise Management.

This gives distributors a clear technical basis for positioning L4-IF within the L-IF range. The next model adds Standard Transient Noise Management, while the 12-channel and 16-channel configurations introduce the broader Standard environmental-processing platform.

The processing structure is therefore easy to explain in a B2B comparison: L4-IF establishes the baseline, L8-IF adds a defined transient-noise function, and the upper models introduce Standard environmental management.

Professional Operating Functions

L4-IF provides 1 selectable program and includes an Internal Sound Field Assessment System and Internal Audiometer System.

Additional functions include:

• Adjustable Turn-on Delay
• Occlusion Effect Management
• Low Battery Power Notification
• Adjustable Notification Volume
• Volume Control
• FM Interface Compatibility
• Auto Phone Function
• Memory After Power-off

Personalized Data Storage is specified as Standard. Nano Coating Technology is included.

These functions give hearing care organizations a practical operating specification for assessment, fitting and routine device management, while distributors gain additional technical content for catalog and procurement documentation.

B2B Portfolio Role

As a 4 channel digital hearing aid, L4-IF is suitable for distributors, importers, audiology clinics and hearing centers that need the first configuration in a structured L-IF range.

Its product identity is centered on 4 fitting channels, 8 adjustable bands, 16 DSP channels, AFC 2.0 with 2 levels, ENDR 1.0 up to 15 dB, Standard Personalized Data Storage and the 110 / 105 dB OSPL90 profile.

The model can serve as the reference SKU for B2B portfolio planning, allowing higher configurations to be positioned through measurable increases in fitting capacity and environmental-processing functions.

Technical Specifications

FAQ

How many fitting channels does L4-IF provide?

It provides 4 independently adjustable compression and amplification channels, 8 adjustable bands and 16 DSP channels.

Which feedback technology is included?

AFC 2.0 Adaptive Feedback Cancellation with 2 levels is included together with SIW technology.

What is the ENDR specification?

ENDR 1.0 is specified at up to 15 dB.

How many selectable programs are included?

L4-IF provides 1 selectable program.

What data storage level is specified?

Personalized Data Storage is specified as Standard.

Contact AcoSound

Looking for a 4 channel digital hearing aid for your professional product portfolio? Contact AcoSound for L4-IF specifications, sample information and B2B project support.