Any thoughts about adapting the 4 pi to the D'appolito configuration?

Some of the benefits are:

-increased effieciency to better match the HF horn's effieciency (and SE tube amp's power)

-ability to use 16 ohm drivers in parallel with existing crossovers (there were many threads here about the use of 16 ohm tent sale drivers)

The JBL driver version of the 4 pi has such a small cabinet size that even doubling it will still make it smaller than some of the alternative driver 4 pis.

On a JBL history website, they showed a few JBL models (the Everest?) that had a woofer above and below the horn midrange. So the approach was validated in a flagship JBL commercial product.

Do you think this is a worthwhile project? Are there any downsides to this approach (other than cost and increased cabinet size)?

Thanks,

Brian

The JBL model that uses a woofer above and below the midrange horn is the K2, not the Everest. Information about it is available at:

http://www.audioheritage.org/html/profiles/jbl/k2.htm

It was built prior to D'appolito naming this configuration and describing its benefits.

The D'appolito configuration uses a woofer above and below the midrange/tweeter. It uses geometry to partly solve crossover, efficiency, and maximum output issues. Mr. D'appolito has published his designs in the Audio Amateur (now AudioXpress) and theory papers in the Journal of the Audio Engineering Society.

Brian