CT 308 (Empor SL)   Floorstanding as in K+T 2/2020

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 914 x 218 x 345 mm
  • frequency range (-8dB): 34 - 26000 Hz
  • crossover frequency(s): Hz
  • speaker type:

CT 308 (Empor SL) is a two way floorstanding speaker.

CT 308 (Empor SL) is a TQWT-loudspeaker with drivers of Omnes Audio .

The kit is delivered with the following drivers:
- a Omnes Audio T25 H tweeter
- a Omnes Audio LoCo 6.1 woofer

The loudspeaker has been developed by BaurAkustik.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,3% above 400 Hz and doesn't exceed 0,7% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Omnes Audio T25 H
  • Omnes Audio LoCo 6.1
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 1,5x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 100x50x4 cm, black
  • Terminal T105 Au, with brass, gold plated
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, torx, 8 pieces
  • Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 400 Vdc
  • Audaphon MKT CAP 160 Vdc
  • 0.7 mm air core coil
  • Mundorf H core coil H100
  • Metal-oxide resistor, 10W
  • Metal-oxide resistor, 10W

Kit without cabinet, price per speaker   EUR 98,90 excl. VAT: € 85.26 / $ 100.61

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 Omnes Audio T25 H are of type polypropylen (MKP) Clarity-Cap SA 630 V.

  • ClarityCap SA capacitor 630 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • Mundorf baked varnish air core coil BL71
  • Mundorf H core baked varnish coil BH100
  • Metal-oxide resistor, 10W
  • Metal-oxide resistor, 10W

Kit with high-end-crossover without cabinet, price per speaker   EUR 122,82 excl. VAT: € 105.88 / $ 124.94

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).

  • JB, electrolytic capacitor, bipolar advanced, 22μF / 100 Vdc
  • Mundorf H core coil H71, 2.7 mH/0.42 0hm
  • ceramic resistor 12 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 11,89 excl. VAT: € 10.25 / $ 12.10

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 4,58 excl. VAT: € 3.95 / $ 4.66
We recommend one board per kit (2 boards per speaker pair)


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