JBL 2226H 30 hz "horn" i built

[Brian Steele]

Pretty soon I will post new CAD drawings by request from Robert in Canada. Until then, here is a Hornresp record for a cabinet 1200 mm high, 900 mm deep and 600 mm wide.

I ran this design through my new BOXPLAN-PARAH sim and mostly it's a pretty good match. Well, except for one parameter.

The S2, S3 and S4 points are different because they seem to be sampled at different points along the path length, but the overall lengths of the horns are decent matches (if you used the centerline rather than the advanced centerline approach to measure the path length, the result will be a horn length that's slightly too long).

Vrc seems to be off by a decent amount though.... 10%. I'm curious about that, as it's pretty simple to calculate (internal LxWxH of the chamber, minus any space taken up by the driver, bracing, etc. In the BOXPLAN workbook, the volume of the driver is 8.5 liters. Leaving that out of the calculations brings the workbook's value for Vrc quite a bit closer to the stated 171L.

 

[more10]

There was a flaw in the old calculated hornresp record. Use the latest v4 zip in the other thread Brian

 

[more10]

Vrc seems to be off by a decent amount though.... 10%. I'm curious about that, as it's pretty simple to calculate (internal LxWxH of the chamber, minus any space taken up by the driver, bracing, etc. In the BOXPLAN workbook, the volume of the driver is 8.5 liters. Leaving that out of the calculations brings the workbook's value for Vrc quite a bit closer to the stated 171L.

You are right. This flaw is still there in my generated record. Thanks for pointing this out.