FTX 1225 Monitor   Shelf speaker as in K+T 3/2018

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 96 dB
  • size (HxWxD): 245 x 570 x 364 mm
  • frequency range (-8dB): 60 - 20000 Hz
  • crossover frequency(s): 1800 Hz
  • speaker type: closed box
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FTX 1225 Monitor is a two way compact speaker with a coaxial driver.

FTX 1225 Monitor is a closed-cabinet loudspeaker with driver of Celestion .

The kit is delivered with a Celestion FTX 1225 coaxial driver

The loudspeaker has been developed by Dennis Frank and Daniel Gattig.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter of the coaxial driver.
- a 3rd order low-pass filter (18 dB per octave slope) for the woofer of the coaxial driver.

The frequency response of this speaker is mostly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 2% above 300 Hz and doesn't exceed 2% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Celestion FTX-1225 (Coaxial), 8 Ohm
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • 2x Neutrik Speakon NL4MPR, connector round, 4 pin
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 8x Allen screws M6 x 25, DIN 912, 8.8, zinc plated,1 piece
  • 8x 1 pieces drive-in nuts M6, DIN 6930 g zinc-plated
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.

  • Jantzen Cross Cap MKP capacitor 1.2 uF / 400V
  • Audaphon MKP CAP Superior 1.8 uF / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 uF / 400 Vdc
  • Audaphon MKP CAP Superior 22 uF / 400 Vdc
  • Mundorf air core coil L140, 0.33 mH/0.15 Ohm
  • Mundorf air core coil L140, 0.47 mH/0.19 Ohm
  • Mundorf Aronit core coil a140 0.47mH/0.11Ohm
  • Mundorf bs140 core coil 1.5mH/0.12Ohm
  • 4x ceramic resistor 18 Ohm/20 Watt

Kit without cabinet, price per speaker   EUR 367,00 excl. VAT: € 308.40 / $ 354.66

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils on important parts of the crossover for minimizing microphonic effects. - The current flow through the coil creates a magnetic field which sets the reel of wire in motion. This motion induces a voltage in the coil which adds itself to the signal. The stiffer the reel of wire is, the less the signal will be altered. The capacitors for the fullrange driver are of type polypropylen (MKP) Clarity-Cap SA 630 and Clarity Cap PWA.

Kit with high-end-crossover without cabinet, price per speaker   EUR 388,00 excl. VAT: € 326.05 / $ 374.96

Impedance correction

If you want to use a valve amplifier with this speaker an impedance correction should be employed. In this case the component quality is less important; therefore, we offer only one kit (upon request higher quality components are available).


Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 8,72 excl. VAT: € 7.33 / $ 8.43

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.54
We recommend one board per kit (2 boards per speaker pair)


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