Anyway, I found 2 problems with them:
- too tall
- very directional
So, very easily, since those things are all pipes, I slightly changed the design. Have a look!
|modified PVC Voigt pipe design|
To reduce the length, I changed the position of the speaker in the T-piece and added an elbow to bend the resonator parallel to the the horn. The above image shows the 2 different designs I posted earlier.
Also, I inverted the orientation of the full range drivers. There are some advantages:
- the drivers breathe directly into the resonator (similar to the folded TQWT)
- the direct audio of the driver is less directional
- the drivers are better protected
As a first observation I would like to mention that treble and bass seem prominently present in the horn, while the mids are emitted by the driver directly.
As a consequence, that could mean that the horn should be above the driver, since the stereo field is determined by high frequencies.
The next step would be to put a wooden box around the T-piece driver part of the design. This way, the contraption can be held upright and all the ugly part would be hidden away nicely.
If it all seems rubbish what I write about PVC plumbing, give it a try yourself. All parts are readily available in your local hardware store.
Concerning the inverted speakers, I am not yet sure myself. However, for the time being they appear to create a pleasant listening experience.