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KSD Audio

C5 Reference & B88 Subwoofer - 2.1 bundle

C5 Reference & B88 Subwoofer - 2.1 bundle

Regular price €2.799,00 EUR
Regular price Sale price €2.799,00 EUR
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C5 Reference - Coaxial Monitor (Farbe)
B88 Reference - Subwoofer (Farbe)
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Bundle includes 2x C5 Reference Monitors & 1x B88 Subwoofer

C5 Reference - 6" Coaxial Monitor

The recently developed steel housing has been designed to maximize the internal volume of the device, while still maintaining compact external dimensions. This clever design ensures that the device remains stable and steady, providing an optimal listening experience. The result is a sound image that is calm and well-balanced.

One of the standout features of this device is the unique shape of the rear-to-back bass reflex port. This innovative design effectively eliminates any audible air turbulence, further enhancing the overall sound quality. You can enjoy your music without any unwanted disturbances or distortions.

The C5 reference also boasts a new 6″ coaxial chassis, which delivers exceptional sound performance. With maximum tonal neutrality and minimal distortion, you can immerse yourself in high-quality audio. Every note and every beat will be reproduced with precision and accuracy.

To further enhance the listening experience, the C5 reference comes with an included table stand. This stand serves a dual purpose – not only does it provide a stable base for the device, but it also decouples the C5 reference from the installation surface. This decoupling allows for precise angle and alignment adjustments, ensuring that you can customize the device to suit your specific workplace setup.

Overall, the C5 reference offers a combination of innovative design elements and high-performance components. With its maximized internal volume, compact external dimensions, and exceptional sound quality, this device is sure to impress even the most discerning audiophile.


Technical Specs of the C5 Reference

  • 2-way coaxial point sound source,
  • Signal processing:
  • in FPGA in 24 Bit ADC/DAC FIRTEC(™) patent:19823110 
  • FIR-Xover, Limiter, 6User-EQ, High-&Lowshelving, Delay, Gain
  • 1″ neodymium tweeter
  • 6″ Kevlar woofer/midrange driver 
  • Power amplifiers 80 W / 175 W
  • SPL (max) 108 dB peak/pair
  • Frequency response 48 – 22000 Hz
  • Weight 8kg incl. packaging 10 Kg
  • Dimensions 200 x 245 x 220 mm
  • Accessories table stand / wall mount included
  • Remote Control (optional) KSD-RC controls 6 user EQs, volume, delay, etc.


C5 Reference at Musotalk:



C5 Reference in Motion:



Reviews of the C5 Reference:

Delamar - C5 im Test: Königsklasse

Amazona - Koaxial made in Germany

Sound & Recording - KSdigital C5-Reference Nearfield-Monitor mit FIRTEC im Test

FairAudio - Kompakt, kantig, koaxial

It's a match:

Check out the optional KSD- RC. 


B88 Reference Subwoofer


The B88-Reference is a compact mono subwoofer designed to enhance the bass performance of the Reference series and third-party monitors.

The acoustic advantages of the B88 Reference

  • Universally applicable with high-pass outputs for active satellite speakers
  • Subwoofer in a flow-optimized steel case
  • DSP (digital signal processor) for exact crossover and equalization and delay
  • High sound power in the bottom octave (from 28 Hz)
  • Satellite outputs with suitably softened signal
  • Delay and level on the subwoofer adjustable
  • Volume and filter adjustable via KSD-RC

With its integrated digital signal processing and two power amplifiers, this subwoofer takes your existing audio system to the next level. The two 250W PWM power amplifiers work in conjunction with two high-performance eight-inch chassis, providing a controlled and powerful reproduction of deep bass frequencies. Say goodbye to unwanted roar or pumping and enjoy stress-free, detailed sound.

The B88-Reference features two XLR outputs for connecting satellite monitors, delivering a suitably softened signal above 80Hz. The built-in digital signal processor ensures a linear frequency response, while internal filters allow for fine-tuning to match your room and application. You can even adjust the delay directly on the amplifier to compensate for any spatial offset between the B88-Reference and the satellites.

Thanks to its specially designed high-performance chassis housed in a flow-optimized steel enclosure, the B88-Reference produces an extremely controlled and „dry“ bass signal, free from typical ventilation noises.

Whether you need a mono subbass extension or a third way for your stereo sound setup, the B88-Reference has got you covered. It also excels in transmitting the LFE channel in 5.1 or other 3D audio configurations. Plus, with the optional KSD remote, you can easily make adjustments to gain, phase/delay, and six parametric EQs, giving you complete control over your audio experience.


Technical Data of the B88 Reference:

  • Stereo/mono subwoofer
  • Signal processing:
  • in FPGA in 24 Bit ADC/DAC FIRTEC(™) patent:19823110
  • Limiter, 6User-EQ, Lowshelving, Delay, Gain
  • 2 x 8″ high-performance woofer 
  • Power amplifiers 2 x 250W 
  • Frequency response 28 – 80 Hz
  • Weight 28kg, incl. packaging 29kg
  • Dimensions 480 x 240 x 310 mm 
  • Remote Control (optional) KSD-RC controls 6 user EQs, volume, delay, etc.

It's a match!

Check out the matching A100 2-way-speaker. 

Check out the optional KSD- RC. 


All Bundle Deals:

A100 & B88 2.1 Bundle. 

More questions? Get in touch!