Building with E-V SP8B

[ARRAY]

Anyone build a cabinet using this driver?

[Hoerninger]

Many years ago I build a horn around it:
http://www.speaker-online.de/bauen/naumann/
http://www.speaker-online.de/bauen/naumann/geh.htm
I rearranged the folding , so it was a w-horn. It worked great for a theater group.
___________
Peter

PS: http://www.geocities.com/tadgesualdo/12trxbwebsite.html

[speakerdave]

I have a chart for the SP8C. What the difference would be from the B I don't know. For a 45 Hz 3 dB down point, they specifiy 1.47 cu ft, a port of 8.7 sq in with a duct 4.4" long. You can go deeper than that, but it would tend to throw the midrange and bass out of balance on peaks.

For optimum midrange you would want to go a little smaller, with a 60 Hz down point: .738 cu ft, a port of 7.7 sq in, with a duct of 5.4"

If you want to use it as a full range and want deepest practicable bass, 31 Hz 3 dB down point, they suggest 3.69 cu ft, 10.3 sq in and 3.8 length, but I believe you would be sacrificing midrange quality for that, and it would be out of balance on orchestral peaks and such (the bass would seem to disappear).

For use as a midrange in a closed subenclosure, you would need to experiment, balancing your planned crossover frequency against the driver's behavior in a small sealed box, which I cannot predict.

I don't know if the Thiele/Small parameters exist anywhere for these drivers.

These would likely be good sizes for the B. Just cut your ducts long and do your own tuning.

David