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THE PYB BASS REFLECT TUBES ARE HERE




Ok, you have to deal with that first. I too have previously reached for a shelf when a bass reflex tube was required. After I had dealt with the piece of pipe a little, I noticed a few points that bothered me about it. I'll just list it clumsily:


  1. It is almost impossible to get a flow-optimized pipe of the right length.

  2. It is also almost impossible to get a bass reflex tube of the right length.

  3. Many pipes cannot be installed flush with the baffle.

  4. They are only available in black and made from inferior materials. There is therefore no freedom of design.

  5. The installation is usually done by pressing it into the baffle. Expansion can be difficult or even impossible.


Somehow I couldn't understand why it was the way it was. These parts are a very important acoustic component. After all, it is the connection between the inside of the case and the room in which you listen to music. In addition to the sound waves, air is also pumped through the bass reflex tube. If there are too many sharp edges in the pipe used, they punish our hearing with unwanted hissing and puffing noises that we don't want.


Let's start with the topic of "flow".

The sound energy from the chassis compresses the air inside the speaker housing. To put it simply, sound energy is ultimately generated through these fluctuations in pressure and density. So our pipe struggles with constantly changing situations. In order to reduce the turbulence of the air and the associated background noise, the inlet and outlet of the pipe can be rounded.



That's what I did then. Since the air moves back and forth within the bass reflex tube, the inflow and outflow have the same radius. This meant that the topic of “flow” could be addressed. a checkmark must be placed.


How much can it be please?

It's always very easy in CAD. Anything can be drawn. The pretty piece of pipe is now drawn and can be made into any length. The green areas each measure approx. 15mm. Contrary to the classic methods for producing 3D printed parts, this tube is “spiralized”. The body is not produced in individual layers as usual; instead, the printer's nozzle performs a spiral movement. This creates a body without the usual seam.


The eye listens along


In order to be able to create flush installation, a flange was inserted into the construction (blue). Installation is then carried out using a cutout that fits the pipe.


How is it attached

There are 2 options

  1. The blue flange is screwed on using a screw. However, this is only possible if the location where the pipe is located is still accessible. Since this is not always the case, there is an option.....

  2. ....screw the screw to the back of the baffle using a clamping ring. After the housing has been completed, the tube is then screwed from the front into the thread attached to the rear.




The pipes are now available in the following dimensions:

Pipe cross section

Inside diameter

Installation diameter

Flange diameter

Flange thickness

706,858 mm²

30mm

50mm

66mm

3mm

1256,637 mm²

40mm

60mm

76mm

3mm

1963,495 mm²

50mm

70mm

86mm

3mm

2827,433 mm²

60mm

80mm

96mm

3mm

3848,451 mm²

70mm

90mm

106mm

3mm

5026,548 mm²

80mm

100mm

116mm

3mm

6361,725 mm²

90mm

110mm

126mm

3mm

7853,982 mm²

100mm

120mm

136mm

3mm

The minimum length is 45mm, the maximum length is 230mm. Up to this length the pipe is made from one piece. In addition, it is made of 2 parts.












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