Hi, I've two Tempest-X, DCX2496 and an EP2500 at my disposal. I have no idea if I'm going sealed or ported. Many people say "just build two sealed boxes, 8^3 each". I don't know. First, they'll be huge. Second, if I go ported, I'll get more output. I can add a subsonic (highpass) filter with the DCX2496 to protect the drivers from bottoming out, which probably is necessary in a ported enclosure. Application is 50/50 music/film.
Which simulation program gives the most accurate results? I'm currently using WinISD and Bassbox 6 Pro.
Here comes some graphs using WinISD. I'm aware that the Tempest-X likes BIG boxes, but I'm trying to cheat it.
In a 250L sealed box the Tempest-X reaches 33mm excursion at 10Hz, using 600 watts.
In a 200L sealed box it never goes up to 30mm excursion, using 600 watts.
Excursion:
SPL:
Transfer function magnitude: 
There is no xmax left for raising the bottom end with EQ. Just to clarify, I would probably be very happy with two sealed boxes but I'm just trying to get the best that I can get, even if I don't "need" it
. Building ported boxes would require a slot port otherwise the length of the tubes would be way too long, so slot port is not a problem for me. (it would be a first time building them though)
So, how about some ported simulation...
250L ported, tuned to 15Hz, slot port (mm) 500x50x1200, versus 250L sealed. 600 watts @ both. The ported box has a 4th order Linkwitz-Riley highpass filter at 10Hz.
Airspeed:
Excursion:
SPL @ 600W:
Transfer function magnitude: 
And some final graphs comparing 250L ported, 250L sealed and 200L sealed:
Excursion:
Group Delay:
Impendance:
Impendance phase:
Maximum SPL:
SPL:
Transfer function magnitude: 
Any comments, ideas? Did I miss something? Will the long slot port become a problem (noise, resonanse)?
Thanks,
Mathias
Which simulation program gives the most accurate results? I'm currently using WinISD and Bassbox 6 Pro.
Here comes some graphs using WinISD. I'm aware that the Tempest-X likes BIG boxes, but I'm trying to cheat it.
In a 250L sealed box the Tempest-X reaches 33mm excursion at 10Hz, using 600 watts.
In a 200L sealed box it never goes up to 30mm excursion, using 600 watts.
Excursion:
There is no xmax left for raising the bottom end with EQ. Just to clarify, I would probably be very happy with two sealed boxes but I'm just trying to get the best that I can get, even if I don't "need" it
So, how about some ported simulation...
250L ported, tuned to 15Hz, slot port (mm) 500x50x1200, versus 250L sealed. 600 watts @ both. The ported box has a 4th order Linkwitz-Riley highpass filter at 10Hz.
Airspeed:
And some final graphs comparing 250L ported, 250L sealed and 200L sealed:
Excursion:
Any comments, ideas? Did I miss something? Will the long slot port become a problem (noise, resonanse)?
Thanks,
Mathias