BHI desktop MKII DSP speaker

Experience crystal clear communications with the BHI Desktop MKII , a 10W  DSP-enhanced noise-canceling speaker specifically designed for base stations. This advanced speaker eliminates noise and interference, making voice sound clear and distinct. Suitable for all types of radios, transceivers, receivers, and SDR radios, the Desktop MKII offers an unparalleled listening experience.

Excellent sound quality

The Desktop MKII is equipped with a 4" bass and a 1" tweeter , supported by BHI's advanced DSP noise reduction technology . This system can produce a peak audio output of 10 watts , resulting in powerful and clear sound reproduction.

User-friendly operation

The Desktop MKII is easy to operate thanks to the intuitive rotary controls on the side of the speaker. Volume and filter level controls allow you to effortlessly adjust the settings to your preferences.

Versatile connections

The Desktop MKII is equipped with two 4mm screw terminals on the rear panel for mono speaker-level signals (4 or 8 ohms) , and a stereo 3.5mm "Line Level" input , ideal for SDR radios, Elecraft, and FlexRadio products. In addition, the speaker has a 3.5mm headphone jack on the side for mono or stereo headphones. Power is supplied via a 12V DC connection with a 2.1mm jack (center + front).

Adjustable filter level control

Noise reduction can be easily switched on and off by pressing the filter level control. The dial allows you to adjust the filter level in real time to suit your listening conditions, with noise reduction ranging from 9 to 40 dB (8 levels).

Easy to use

Using the Desktop MKII speaker is simple: connect the power cord and audio cable to the speaker and your radio, turn on the power, and you're ready to go. Adjust the volume and filter level controls to your liking for an optimal listening experience.

Features of the BHI desktop MKII speaker

• Quality 10 Watt amplified DSP noise canceling speaker
  
• Advanced BHI DSP noise reduction technology
  
• 4" bass and 1" tweeter speakers for superior audio
  
• Compatible with most radios and receivers, including SDR radios
  
• Easy to operate with intuitive rotary knobs
  
• Separate audio inputs for speaker level and line level
  
• Overload protection for audio input level
  
• Noise reduction ranging from 9 to 40 dB (8 levels)
  
• 3.5mm headphone jack for mono or stereo headphones
  
• With the BHI Desktop MKII, you're bringing a top-of-the-line speaker into your home that will elevate your listening experience. Order today and enjoy interference-free communication!

Direct current

• Connector Type: 2.1mm DC Power Jack (Center Positive)
• Input voltage: 12 to 18 Volt DC
• Input current: 10mA standby, 125mA active (no signal), 2.5A peak

Line level audio input

• Connector type 3.5mm mono or stereo line level
• Input voltage range 160mV to 1.6V pk-pk
• Input impedance 10kΩ (±2kΩ) nominal

Audio input speaker level

• Connector type 2 x 4 mm banana plug/screw terminals (mono)
• Input voltage range 350mV to 3.5V pk-pk
• Input impedance 8Ω (±2Ω) nominal
• Nominal input power 1.5 W max

Audio output

• Speaker output power 10W peak (supply voltage 18V)
• Bandwidth 50 Hz to 4.3 kHz
• Volume levels 16 levels (3 dB steps)
• Headphone output 3.5 mm mono or stereo (8 to 64 Ohm)

DSP Noise canceling

• Filter levels 8 levels + off
• Noise reduction 9dB to 40dB
• Tone reduction 4dB to 65dB

Indications

• Status LED Multi-colored LED (red, orange, green)
• Audio Tones Power On, Power Off, DSP Filter Level, Volume, and Memory Storage / Input Overload Indication.

Operation

• Power/Volume Digital Rotary Encoder with Push Function
• DSP Level Digital Rotary Encoder with Push Function  

**NOTE for Elecraft K3 users: To connect to the K3 using the included speaker cable, you will either need to run an audio cable with a 3.5mm stereo plug (tip connected only) into a 3.5mm mono jack, or one of our ALD-009 cables, or you can use a 3.5mm stereo plug to connect the cable and plug it from your K3 into the Line-In jack on the desktop MKII speaker (ALD-007).

Available BHI accessories

• PSU12-2A-WW : 12V DC 2A 24W Power Supply for Worldwide Use (Europe, Australia, UK, USA) 2.1mm center positive
• Mini-Switch: BHI mini-switch is a 2-way switch that allows you to connect 2 radios to a BHI DSP noise canceling device.
• 1042 Six-Way Switch Box: This switch box allows you to connect up to six devices (radios, transceivers, and receivers) to a BHI noise-cancelling product.
• Desktop Feet: Set of 3 protective rubber feet for the BHI desktop DSP MKII speaker. Includes two 16mm feet and one 6mm foot. The 16mm feet fit next to the front standard plastic foot, and the 6mm foot fits on the metal bracket.
• 1030-FPL: Power cord with fuse power - 2.1mm connector
• ALD-007 - Cable with a 3.5mm stereo jack and a 3.5mm stereo jack. Cable length: 120 cm.
• HP-1 Wired Stereo Headphones - Comfortable dynamic stereo headphones for listening to radio communications.
• Desktop ACBL: 120cm cable with a high-quality 3.5mm mono connector and red and black banana plugs.

Common problems and solutions when using the BHI desktop MKII

The BHI Desktop MKII is a powerful noise-canceling speaker, but sometimes problems can occur. These can include little or no sound, unwanted noise, or a speaker that doesn't function properly in DSP mode. Below are the most important considerations and troubleshooting tips.

Little or no sound:

• Check the input signal: Make sure the source volume is not too high to avoid clipping and distortion.
• Check the connections: Check that all cables and connectors are properly connected.
• Volume settings: Increase the volume on both the audio source and the desktop MKII. Make sure the source volume isn't set too high to avoid clipping.
• Use the correct input: Preferably use the 3.5 mm mono or stereo plug on the line input, instead of the red/black speaker terminals.

Noise or interference:

• Filter settings: Check that the filter is turned on (LED should be green or orange) and adjust the filter strength.
  
• Use ferrite cores: If you experience interference, try using ferrite cores on the audio cable or place the speaker further away from other devices.
  
• Grounding: Ensure your installation is properly grounded to minimise noise.
  
• Power supply noise: Some switching power supplies can produce noise. Try a different power supply if necessary.
  

Speaker not working in DSP mode:

• Check the power: Does the power LED turn on?
  
• DSP Switch: Make sure the speaker is actually set to "DSP" and not "Off" (which will bypass DSP).

General tips:

• Audio Presets: Disable any sound enhancements in your operating system.
  
• Default Device: Make sure the correct audio output is set as the default.
  
• Windows Updates: Make sure your system is fully updated.
  
• Windows Troubleshooter: Run the built-in audio troubleshooter to analyze your audio.

Explanation:
"Clipping" occurs when the audio signal is too strong for the device to process correctly. The sound then becomes distorted, often with audible crackling or tearing. In Dutch, this is commonly referred to as signal overdrive, or simply overload.