Flex hose as port in vented cabinet ?

[Jan Dupont]

I won't argue with you regarding your calc of air speed

However I know that this driver in a 125 liter (cf ???) cabinet with a single 10 cm flared port (correction from one of my first posts 10 cm = 3.9") plays down to 25 Hz at high power without any port noise...... The guy who calculated this for me has uses such speakers.

However I will of course describe the listining result here soon

[Puggie]

A better option may be the reinforced plastic hose used for water and 'trash' pumps. its available in sizes from 2" to about 6" dia and is a thicker harder version of what you showed originally. a PVC flexible (quite stiff though) hose with a spiral wire reinforcement. I have considered using it before, but never had a need to. Try Hardware and industrial pump equipment sales.

http://www.machinemart.co.uk/shop/ra...valves-filters

click on the non existant image in the upper left corner of the main window to see what I'm talking about, I'm sure you can get larger than 3".

[Jan Dupont]

Thnks for the input, Puggie
I will also look for this kind of hose.

[Ron E]

On second thought, I would just use a PR...or two.

[AKN]

Hi ACD,

Although not your thread subject, i must agree that one 4" port is very little for your box size, tuning and power.
Simulation with one 15" JBL 2235H in 125L box, 25Hz tuning, one 4" port and 150W input.

[Jan Dupont]

I promissed to return

Got the complete speaker sets up and running (though at the moment using a passive crossover). So fare no problems with the ports using my AMCRON's DC300 Series II in bridge configuration, however I can imagine using higher power than 300W you just put your face in front of the ports and you don't have to shave

More information on www.audio-circuit.dk under my projects

[mikee55]

....I've used a mitre saw to cut an angle through a pipe to mike a 90 deg turn. Or you could use elbow pieces. I just wanted to put this here to give others ideas.

Cheers mikee55

[Jan Dupont]

On this first test run I did use 90 deg. elbow pieces

[OzMikeH]

Don't forget you can get 45 degree PVC bends.

There are some Wide radius bends available, these are for electrical conduit to make it easy to pull cables into buildings.. I have seen these in 100mm with a bend radius of about 400mm

These are usually very thick PVC becasue they are designed to be cast into concrete slabs

[Jan Dupont]

Thanks OzMikeH