Frankstein full-range drivers speakers - what have I created? Why does it seem to work?

[Asterix2k10]

Are those the outside measurements?

jeff

yes

 

[Galu]

I know this may make no sense but seems to sound better than without the small plastic tube?

I misread that at first. So the tube is better than no tube.

The longer the tube, the lower the tuning frequency, so you may be hearing a touch more bass.

 

[zman01]

If those are external dimension and the wall thickness of the cabinets is 15mm, then the internal volume would be around ~16.75 liters, and maybe a little less than 16.5 liters are taking into account the driver magnet, port etc.

 

[vinylkid58]

Ok, I'm going to call it 16.5 liters, tuned to 50Hz, a 3" dia. vent is going to be 10.8" long, so obviously that's not going to work.

Dropping the vent dia. to 2", we get a length of ~4.3", so pretty close to Dave's calc.

 

[planet10]

It’s easier to use a 3” diameter tube because that’s the size of the hole.

8’ long,long enuff you might get some vent resonances, but the recomended damping in the vent will largely tame that.

dave

 

[planet10]

If those are external dimension and the wall thickness of the cabinets is 15mm, then the internal volume would be around ~16.75 liters, and maybe a little less than 16.5 liters are taking into account the driver magnet, port etc.

3” D x 8.5” long, add some dampinmg.

dave

 

[chrisb]

There are also plumbing pipe reduction fittings that could reduce the functional diameter closer to the 2” that Jeff suggested above. I doubt they’d even need to be glued in place?