Perhaps he means High Energy Density capacitors.
I did a little web search and found the following ...

http://www.llnl.gov/IPandC/op96/07/7k-hig.html


At 04:43 PM 6/2/99 EDT, Jim Mathis wrote:
>My boss has heard from our primary customer that there is a new capacitor
>technology called High Density Capacitors.  Has anyone heard of this and
>knows which manufacturers are producing these?  I suspect that this is merely
>a reduced case size for larger values made by someone, but I need to check it
>out because we're in the same boat as everyone else by needing to put "12
>pounds in a 6-pound bag"!
>
>Thanks in advance to everyone for any help or guidance you may provide.
>Jim Mathis,
>Radio Sound Engineer

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