CT 309 is a compact loudspeaker with a full range driver.
CT 309 is a loudspeaker with drivers of Mark Audio .
The kit is delivered with a Mark Audio CHN 50 full range driver
The loudspeaker has been developed by Thomas Schmidt.
The crossover consists of:
- a blocking circuit in series with the full range driver.
The frequency response of this speaker is nearly linear.
The decay spectrum (waterfall spectrum) shows a decelerated swing-out behaviour in the mid-range.
At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,7% above 500 Hz and doesn't exceed 1,3% at 95 dB at 1 m between 300 and 15000 Hz.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 54,20 excl. VAT: € 45.55 / $ 55.11
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 Mark Audio CHN 50 are of type polypropylen (MKP) Clarity-Cap ESA 250 V.
Kit with high-end-crossover without cabinet, price per speaker EUR 70,50 excl. VAT: € 59.24 / $ 71.68
The LowCost kit is delivered with:
Kit with LowCost-crossover without cabinet, price per speaker EUR 45,20 excl. VAT: € 37.98 / $ 45.96
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 9,00 excl. VAT: € 7.56 / $ 9.15
If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. str-RA140, price per unit: EUR 4,20 excl. VAT: € 3.53 / $ 4.27
We recommend one board per kit (two boards for a speaker pair)