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Dual In-Line module
Dual In-Line ports
Dual In-Line headphone port
Dual In-Line top down
Dual In-Line cables
  • Dual In-Line module
  • Dual In-Line ports
  • Dual In-Line headphone port
  • Dual In-Line top down
  • Dual In-Line cables

Dual In-Line DSP Noise Cancelling Module

Price: £189.95
(£158.29 excl VAT)
The bhi Dual In-Line is a dual-channel, DSP noise cancelling in-line module that removes unwanted noise and interference from audio signals, delivering crystal-clear speech for radio communications and audio equipment.
  • Fits between your radio and extension speaker
  • Advanced DSP noise cancellation technology providing up to 40dB of noise reduction across 8 adjustable filter levels
  • Multiple connectivity options, including dual mono/stereo inputs and three output types: 7W mono speaker, stereo line-level, and headphone outputs
  • Built-in amplification system with 7W mono speaker output and dedicated 0.5W + 0.5W headphone amplifier
  • Simple control interface featuring rotary knobs for input/output levels and filter adjustment
  • Durable construction using impact-resistant ABS plastic housing, measuring 165mm x 78mm x 50mm
  • Powered by 12V DC with low power consumption (800mA nominal, 2.5A max)
  • Ultra-low latency of 38ms for real-time audio processing
The Dual In-Line module is a direct replacement for the obsolete bhi NEIM1031MKII, but with the latest bhi DSP noise cancelling technology and more features.
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Remove background noise and hear speech clearly with this fully featured DSP noise cancelling in-line unit

The Dual In-Line module uses our unique DSP (Digital Signal Processing) technology to effectively distinguish between speech signals and background noise, dramatically improving speech intelligibility even under challenging conditions. Whether you're working with weak signals or operating in noisy environments, this unit ensures your communications remain clear and comprehensible.

This versatile device seamlessly integrates into any audio setup, fitting between your radio and extension speaker. It accepts speaker-level and line-level inputs through standard 3.5mm connections. The ability to process either stereo signals or two separate mono channels makes it ideal for a wide range of applications. The unit's flexibility is further enhanced by its multiple output options, allowing simultaneous use of headphones, passive speakers, and powered speakers.

The unit is supplied with:

  • 1 x ALD-007 stereo plug-to-plug lead
  • 1 x ALD-001 3.5mm mono plug-to-plug lead
  • User manual
  • Rubber feet
  • A fused DC power lead.
You may want to consider a separate mains plug-in 12V DC power supply like the worldwide PSU-12-2A-WW.

Who is the Dual In-Line module for? 

Not sure which of our in-line modules to choose? Read our guide to the different in-line module options.

Read our in-line module guide

Boost your audio

Why not boost your receive audio further and use one of our EQ20 10W parametric equaliser units with your Dual In-Line unit?  Simply connect the "Line Out" signal to the input of the EQ20 and connect your passive speaker or headphones to the EQ20 output. You will be able to fine-tune your audio to suit your hearing. This is especially useful if you suffer from hearing loss.

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Specification

Operating voltage: 10 to 16v d.c. (800mA nom, 2.5A max)

Dimensions: L165mm x W78mm x D50mm, weight 0.38Kg

Audio Input

  • Input – Stereo (Audio 1 – Plug Tip, Audio 2 – Plug Ring)
  • 8 Ohms at 2Watts
  • 10K Ohm at 600mV p-p

Audio Outputs

  • Headphones/small speakers – 0.5 + 0.5 Watts into 8 Ohms
  • Speaker – Greater than 6 Watts into 8 Ohms
  • Line - Stereo 600 Ohms at up to 0dBV
  • Ultra-low latency of 38mS

Connections

  • Audio Inputs - 3.5mm Stereo Jack Socket
  • Line and Headphone Outputs – 3.5mm Stereo Jack socket
  • Mono Speaker output – 3.5mm Mono Jack socket
  • Power 2.1mm Coaxial Power Jack centre Pin = +Ve

Controls

  • Audio Input Level
  • Combine/Separate signal switch
  • DSP Filter Levels 1 – 8
  • Noise suppression: 8 to 40dB
  • Tone suppression: Up to 65dB
  • 3 positions - Off/On/DSP Noise Cancelling On
  • Audio Out Level (Mono speaker and headphones - 3.5mm Mono connection only )
  • Line Out Level

Indicators

  • Power ON
  • Noise Cancellation ON
  • Channel 1 Overload
  • Channel 2 Overload

Testimonials

"Highly impressed, worth the cost, very effective at removing noise but leaving signals, excellent performance, surpassed my expectations" - Dan AB5VJ

"Reduced noise and made more clear and more pleasant" - Steve Gibbs, using it for scanner and HF listening

"I bought the Dual Inline from DX, and I can now hear all the call signs clearly the first time, despite the thunder crashes on the air. I usually have the filter level at 4, occasionally 5, and never need it higher even in bad conditions. It's working great for me. Thank you!" - Paul AE5JU

Read the excellent review in QRPer.com by Thoma Witherspoon K4SWL

FAQs

What audio connections are supported?

The Dual In-Line supports speaker level stereo/mono and line-level via 3.5mm jacks, plus a 7W amplified mono speaker out socket and 3.5 mm stereo headphone output. It's compatible with both stereo speakers and mono rigs.

What is the audio output power?

The audio output power is 7W from a standard 4 or 8 ohm mono loudspeaker and “line level” audio for connecting powered speakers or an amplifier stage.

How is it powered, and what voltage is required?

It operates from 10–16 V DC at 800 mA nominal (up to 2.5 A peak). Includes fused DC lead; a 12 V DC desktop supply is recommended.

Does it introduce a noticeable audio delay?

No, you won’t notice latency. DSP latency is very low.

Does the loudspeaker mute when stereo headphones are plugged in?

No, on this unit, you can listen through headphones and a mono loudspeaker at the same time.

Can you connect two radios to this unit?

Yes, you can do it using one of our ALD-YO1 splitter cables. This cable enables you to connect two separate mono inputs to the left and right channels when the “separate/combined” switch is set to “separate”. You can then listen to both radios using stereo headphones or by connecting a pair of powered speakers to the “line out” socket.

What are the DSP levels and max noise suppression?

The Dual In-Line features 8 selectable filter levels providing 8–40 dB noise cancellation, with tone suppression up to 65 dB.

Can I switch between stereo and mono inputs?

Yes—there’s a switch to combine or separate input channels, making it great for dual-mono or stereo setups.

Is this a replacement for older models?

Yes, this module is a replacement for the discontinued NEIM1031MKII, featuring enhanced DSP noise cancelling and functionality.

What’s included in the box?

It comes with mono and stereo 3.5 mm cables, a user manual, rubber feet, and a fused DC power cable with bare ends.

We endeavour to dispatch all orders received before 2:00 pm the same day. 

We kindly advise that orders placed on Fridays may be processed the next working day, with dispatch most likely taking place on Monday.

Standard shipping method worldwide is Royal Mail up to 2kg.  For orders over 2kg we use a parcel courier service for the UK, and a European road service for Europe. See our shipping rates & table for more information on our shipping rates. 

EU customers: You are no longer charged the 20% UK VAT on your orders as a result of Brexit. Be aware that you are likely to be charged import taxes and/or duties by your own tax authorities and an administration fee by the parcel delivery company on any goods you purchase from us in the UK. But remember, you didn’t pay the 20% UK VAT on your order. 

Additional charges are the responsibility of the recipient because we have no control over these government-imposed charges and cannot determine what they may be. Customs policies vary greatly among countries. Please contact your local customs office for information. 

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