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KABT-250 User Guide
The KABT-250 is a versatile amplifier package that enables an incredible breadth of projects.
The standout feature of the KABT-250 is support for TWS multi-point pairing. This enables
many amplifiers to communicate with each other and play in sync for wireless audio systems.
Creative projects such as a 2.1 system with a wireless sub, party speakers that wirelessly play in
unison, or even a wireless stereo system are now within reach for professionals and hobbyists
alike. In addition to the TWS feature, the KABT-250 features highly efficient 2x50 Watts or
1x100 Watts of class D power, a DSP engine configurable with a PC app, and convenient wiring
harnesses for quick installation. The KABT-250 features the same form factor as previous KAB
amplifiers, making it a compelling upgrade for many existing projects.
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Summary of Contents for DaytonAudio KABT-250
- Page 1 In addition to the TWS feature, the KABT-250 features highly efficient 2x50 Watts or 1x100 Watts of class D power, a DSP engine configurable with a PC app, and convenient wiring harnesses for quick installation.
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Page 2: Table Of Contents
Required Items for Programming ......................14 Quick Start ............................... 15 Detailed Steps ............................15 Example Projects / Use Cases for KABT-250 ....................17 1. Wireless Bookshelf Speakers ......................17 2. Bluetooth Party Speakers........................18 3. 2.1 System with Wireless Subwoofer ....................19 KABT-250 Specifications.......................... -
Page 3: What Is New With The Kabt-250
KAB amplifiers, it is NOT compatible with the KAB-BE battery board. You must charge your batteries with the battery board if using the KABT-250 The KABT-250 Bluetooth chip is Bluetooth 5.0 and now supports TWS, but it does not support AptX HD like some other KAB amplifiers. - Page 4 They are the same port that is used on the KABD-430. The KABT-250 Bluetooth chip is Bluetooth 5.0 and now supports TWS, but it does not support AptX HD. Because of the need to indicate more Bluetooth statuses due to TWS, there is an additional external BT status LED needed.
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Page 5: Kabt-250 Visual Tour
KABT-250 Visual Tour... -
Page 6: Quick Start And Wiring Guide
Quick Start and Wiring Guide Before You Start Switches There are two switches on the top of the KABT-250. It is important to set these switches for proper operation. Note: Only change these switches if the device is powered off. -
Page 7: Power Supplies
KABT-250. Input Devices The KABT-250 offers a variety of inputs to suit different needs. Even in true wireless stereo (TWS) mode, the device supports streaming either an incoming Bluetooth signal, or an analog signal wirelessly to other paired KABT-250 amplifiers. -
Page 8: Speaker Output
Speaker Output • Supports speaker impedances of 4Ω or higher in stereo mode, and 2Ω or higher in bridged mode. • Delivers 2 x 50W at 4Ω in stereo mode and 1 x 100W at 2Ω in bridged mono mode with a 24V, 5A power supply. -
Page 9: Quick Start Steps
Power supplies out of this range can damage the amplifier. b. The KABT-250 does not have a built- in battery charging circuit, so a battery board such as LBB-3v2 (12V) or LBB-5Sv2 (21V) that has a... - Page 10 Bluetooth source. Additional amplifiers communicate as TWS Slaves to the TWS Master amplifier. External Bluetooth and TWS status LEDs can be added to your KABT-250. These LEDs External mimic the onboard LEDs found next to the Bluetooth onboard pairing button.
- Page 11 AUX sources can be connected directly to the 3.5mm jack built onto the board. An external Audio Input 3.5mm jack comes included in the optional Jacks functional cable pack, which can be plugged (Optional) into J2 to function as a line input for external audio sources.
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Page 12: Tws, Multi-Room, Party Mode
Follow the simple steps below to pair your amplifiers together. LED Status Description There are two status LEDs on the KABT-250. The Blue LED indicates Bluetooth Master status, and the yellow (on board) and green (external) display TWS status. Blue LEDs (on board and external) –... - Page 13 Slave(s) LEDs On Board LED Blue LED - Solid or Blinking Yellow - Off External LEDs Blue LED - Blinking Green LED - Off 2. Prepare the Master Amplifier for TWS pairing: Double-tap the master’s pairing button. The yellow LED on the board will become solid, indicating it is ready for slave devices to be paired to it.
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Page 14: Dsp Programming Via Kpx Programmer
DSP Programming via KPX Programmer The KABT-250 can be programmed with a Windows PC and the KABX/KPX software to activate various DSP features such as filters, PEQ, bass enhancement and more. This requires the optional Dayton Audio KPX Programmer, which acts as the bridge between your computer and the DSP chip that is on each KABT-250. -
Page 15: Quick Start
1) Download and install the latest version of the KABX/KPX software from the KPX programmer product page or the KABT-250 product page. The link to the software should be found in the exact same spot as this guide was found. Follow the instructions in the installer. - Page 16 – The software has a stereo/mono switch that allows different settings to be employed for the stereo output vs. the mono output. On the KABT-250, you will need to modify your EQ differently depending on how you wired your speakers.
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Page 17: Example Projects / Use Cases For Kabt-250
Example Projects / Use Cases for KABT-250 1. Wireless Bookshelf Speakers The KABT-250 amplifier board can be used to create a pair of wireless bookshelf speakers, offering a true stereo listening experience without the need for speaker wires—only power connections are required. -
Page 18: Bluetooth Party Speakers
Speakers in the system can be designed differently, and do not require a similar design to be paired together. Each KABT-250 can be configured to output Left (L), Right (R), or Mixed (MIX) audio, allowing versatility in the setup. Benefits 1. -
Page 19: System With Wireless Subwoofer
3. 2.1 System with Wireless Subwoofer The KABT-250 amplifier boards can be paired wirelessly to create a 2.1 audio system with a wireless subwoofer, utilizing True Wireless Stereo (TWS) functionality. How It Works • Master Amplifier: Connects to stereo speakers and manages the input source (Bluetooth or analog). -
Page 20: Kabt-250 Specifications
KABT-250 Specifications Electrical Specifications Audio Specifications... -
Page 21: Troubleshooting
Troubleshooting 1. No Audio Output, but LEDs are lit This indicates that the board is getting power, but something is wrong with the audio output. Possible Causes: • Input mode switch set incorrectly. • Bad input source or connection • Your mute pin is shorted to GND on J5 •... - Page 22 3. DSP Software Connection Issue (via KPX Programmer) Carefully reread the section about DSP programming above. Follow all instructions closely. Possible Causes: • Faulty KPX programmer or USB cable. Make sure your USB cable is not a ‘power only’ cable. Some cables included with devices for charging do not have data lines.
- Page 23 6. Bluetooth Not Broadcasting / Not Connectable Possible Causes: • Jumper not inserted into audio input connector • Board in slave mode (hold pairing button until the LED blinks blue). • Already connected to another device. • Bluetooth interference 7. Poor Bass Response Possible Causes •...
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Page 24: Version History
Version History • V1.0 Released March 12, 2025...
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