Loudspeaker Kit CT 240 by Klang+Ton

Cheap Trick CT 240/230 revised retro speaker with additional bass driver as in Klang+Ton 1/2009

Technical data:
- size (HxWxD): 102.9 x 53.8 x 33.8 cm
with base
- impedance: 4 Ohm
- sensitivity (2.83V/1m): 92 dB
- crossover frequencies: 320 / 3,6 kHz
- frequency range (-8dB): 24- >20 000 Hz
- speaker type: bass reflex

The Cheap Trick CT 230 was a retro speaker with Visaton drivers published in Klang+Ton 3/2007. For those of you who prefer more bass we strongly recommend the CT 240 (CT 230 revised) with an additional Visaton W 300 S4 for bass.

The CT 240 (CT230 revised) is a bass reflex shelf speaker with Visaton W 300 S4 bass driver, a Visaton TW 6 NG cone tweeter and a Visaton BG 20 full range driver that needs to be modified.

Excerpt from the review in Klang+Ton 1/2009

... "The synthesis between enthusiastic drive and fat bass is simply perfect. Those of you who thought that the CT230 was a hint too reserved around the bottom end, will get kicked in the belly by the CT240. And if that's not enough then hard suspended, active 18 inch PA drivers will do the trick, but they won't get as low. But what's even more interesting than the endurance of the speaker is the fact that there is a tremendous attention to detail: the BG20 relieved from all lower frequencies is a detail detector and it is quite astonishing how meticulously this speaker reproduces even the finest nuances like xxxxx and for how long the decay of vibrating strings is audible. What's particularly noticeable is how well the CT240 differentiates between genuine and artificial reverberation and how this reverb is reproduced in the first place. Apart from the bass the tonal balance of the CT240 is as close as possible to its ancestor, as close as we could manage. And this tremendous openness, the guttural and earthy sound that's exactly what the visual examples like Infinity or JBL are suggesting: pure and unbridled joy excitement. With volume, charm and punch - but not only, this speaker can also be civilised." ...

Our kit consists of

The kit contains per speaker:

Visaton TW 6 NG
Visaton BG20 full range driver
to be modified
Visaton W300 S4
2 mats Tyrotex N30
2 gold plated brass
binding posts
2 metres loudspeaker cable 2x 2.5 mm2
2 metres loudspeaker cable 2x 1.5 mm2
an HP 100 bass reflex tube, to be shortened to 14 cm
8 PAN screws 3.5x17 mm
8 PAN screws 4 x 20 mm
the crossover components to be mounted on wood
(see right)
Klang+Ton building instruction

3.9 mH i-core coil / 0.24 Ohm
15 mH core coil / 4.4 Ohm
4.7 mH core coil / <0.5 Ohm
1.5 mH air core coil / 1.4 mm wire
0.18 mH air core coil / 1 mm wire
0.47 mH air core coil / 1 mm wire
2.2 mH core coil / 1.09 Ohm
150 uF ELCO, etched
330 uF ELCO, etched
33 uF MKP Q4 capacitor
8.2 uF MKP Q4 capacitor
3.9 uF MKP Q4 capacitor
2x 4.7 uF MKP Q4 capacitors
2x 3.3 Ohm MOX10 resistors (orange-orange-gold)
1.5 Ohm MOX10 resistor (brown-green-gold)
33 Ohm MOX10 resistor (orange-orange-black)
12 Ohm MOX10 resistor (brown-red-black)

Price for CT 240/230 kit retro without cabinet per unit: EUR 279,00

If you prefer to mount the crossover components on a PCB instead on wood:
PCB 220x155 mm, Order No. I-8805002, Price EUR 8,80

CT 240 with high-end crossover

Our kit with high-end crossover remains the same for lower frequencies, with the exception of the coil in parallel. Due to the reduced resistance of the coil L2 the value of resistor R1 has to be increased. As a result, 4 resistors 22 OHM MOX10 in parallel have to be employed.

In the signal path to the BG 20 midrange driver a copper foil coil cfc 16 with 1.5 mH is used; an audiophile Mundorf MCAP is fitted for both mid and high frequencies.

3.9 mH i-core coil / 0.24 Ohm
15 mH H100 core coil / 0.8 Ohm
4.7 mH core coil / <0.5 Ohm
1.5 mH cfc14 copper foil coil
0.18 mH air core coil / 1 mm wire
0.47 mH air core coil / 1 mm wire
2.2 mH core coil / 1.09 Ohm
150 uF ELCO, etched
330 uF ELCO, etched
33 uF Mundorf MCAP capacitor/400 V
8.2 uF Mundorf MCAP capacitor/400 V
3.9 uF Mundorf MCAP capacitor/400 V
2x 4.7 uF Mundorf MCAP capacitor/400 V
4x 22 Ohm MOX10 resistor (orange-orange-gold)

1.5 Ohm MOX10 resistor (brown-green-gold)
33 Ohm MOX10 resistor (orange-orange-black)
12 Ohm MOX10 resistor (brown-red-black)

Price for CT 240 high-end without cabinet per unit: EUR 332,00

If you prefer to mount the crossover components on a PCB instead on wood:
PCB 220x155 mm, Order No. I-8805002, Price EUR 8,80

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