12 Shivas Dancing FR plots......

[ThomasW]

There were questions on AVS about my big IB having cavity issues at 50Hz due to the length of the box. AVS software didn't want to upload my attachments so I put them in this thread.

Both plots were done with the original version of DOS CLIO, it's lower measurement limit was 20Hz

Top plot is nearfield no EQ, bottom plot is nearfield with EQ.

Measurements were made with a calibrated B&K 4133

Attachments:

[jeffl]

Are the 12's the only drivers in your IB, and do you have pics on here of the setup. Good looking plot for sure

[ThomasW]

Hi

Here's a link to the complete write up

web.archive.org/web/20151002182057/http://home.comcast.net/~klone-audio/page13-12Shiva1.html

Somewhat crude compared to what we're building today. But in 1999 there were limited driver sources and limited funds for the build. This was the first high output compact IB manifold ever built and the second IB manifold built in the entire world..

[brady]

I have seen and heard Thomas IB in action.

Even though the displacement is equivalent

to 4 15inch drivers, I think there is an

advantage to more motors for low

distortion. His system has extremely low distortion.