Gross volume vs. Net volume

[presscot]

I read the datasheet of Braun LS200, or ADS L1590/2, speakers. It states two values of cabinet volume: Gross and Net volumes, as depicted in the red circle.

Translated from German, the one with 125 liters is Gross volume, while the other with 94 liters is Net volume. The enclosure of these speakers is sealed type.

What is the difference between these two values?

 

[Galu]

The external dimensions of the sealed enclosure are given.

The net volume is the internal volume, while the gross volume is the overall volume.

 

[Galu]

It would be more accurate to say that the net volume is the volume of free air inside the enclosure.

 

[Galu]

I believe the presence of a large internal chamber for the midrange driver and massive cast aluminium frames and magnets on the woofers may go some way to explain the large difference between the net and gross volumes.

https://www.audioasylum.com/reviews/Speakers/ADS/L1590-2/speakers/32/322122.html

 

[GM]

Hmm, historically, gross is the box internal volume and net is after the driver, any bracing, etc., is subtracted from it.

 

[Galu]

historically, gross is the box internal volume

However, I mentioned the external dimensions of the enclosure, which are 290 mm x 1200 mm x 360 mm.

This gives an external enclosure volume of 125 litres, which is quoted in the specs as the gross volume.

 

[GM]

OK, then TTBOMK they misuse(d) it.

 

[mdpaudio]

Gross volume has usually been the internal volume of the cabinet with nothing in it. Net is after the bracing, damping, sub enclosures, and driver displacement (frame, cone, and magnet volume) are subtracted. Some spec sheets have displacement listed for ease of calculation. Don’t forget to subtract the port area as well!