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CT327 - once across the forest of ideas

Admittedly, I was fooled by the CT327 project. After publication in Klang und Ton 6/2023, it took some time until I was able to build one myself. The waveguide on it that fits the FRS5X has apparently found many friends, but more on that later.

I have a machine park (hobby segment) myself to be able to carry out woodworking in any form. However, the motto of this site is not to do exactly that.

So I thought about how I could realize a project like this without a router, circular saw or jigsaw. What's left in the end is a soldering iron and a cordless screwdriver. The only activity that causes dirt is the subsequent sanding of the wooden parts. Since the creation of the case comes from the "classic" If the housing construction differs, I would like to describe it here.

The construction begins with the 3-part rear wall. In order to get this installed afterwards, the later Terminal, as well as the use for the bass reflex tube necessary. These 5 parts should be secured with masking tape; nothing has to be glued together yet. The rear wall is initially only used to position the side parts and the later connection points for the BR pipe and terminal.

Then the side walls, lid, base and cross struts are inserted and glued together. If you don't have screw clamps at hand, you can use masking tape. The strut for the front panel is also positioned. The parts are not yet glued to the back wall!

We can then glue the back wall. The BR pipe and the terminal are used again as spacers as they are removed again after the wooden parts have been glued

Before we can continue building the housing, we have to take a quick look at the crossovers to apply. The position of the individual parts is indicated on the top of the supports. According to this specification, the components are now inserted into the switch carrier and secured with cable ties.

The wiring diagram can be found on the bottom. Wires and cables can be connected to each other according to this specification.

We repeat this step with the crossover for the FRS5X

At this point I looped the cable connection for the amp through the switches. Of course you can lay a separate cable, but then you will later have 2 pairs of cables that are soldered to the terminal. In addition, the cables for the FRS5X and the W130S should be of sufficient length.

After the switches have been soldered, they are installed in the housing. Alternatively, the switch for the W130S can also be mounted on the side wall in the lower housing compartment. Then it is slightly out of the field of fire of the magnet of the W130S.

Now let's take care of the front. We position the front and the baffle on the housing . However, only the wooden part of the front is glued.

The baffle is then removed again. Now the openings can be closed with masking tape to sand the housing. The surface of the housing can then also be finalized. Please note that the later contact surfaces of the plastic parts are not oiled otherwise the adhesive will no longer hold.

The connection terminal can then be inserted into the plastic carrier. The crossover cables are soldered to the terminal. The BR tube and terminal are then glued into the housing.

Before the front is inserted into the housing, the insulation should be installed.

Then the mounting holes for the waveguide and the cable entry are marked and then drilled. The cables for the FRS5x are then routed through the holes. We then solder the W130S to the crossover and screw it into the housing.

Now the Waveguide assembled and the FRS5X soldered.

Suitable feet should then be mounted under the housing.

I hope you have a lot of fun replicating this great KuT project. If you have any questions about this project, please use the contact form on this page or write to me directly at

Björn Kempf


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