Hi arivel,
RE Is the design patent freely accessible?
Generally, a patent should be available to the public at the patent office in the country where it was filed.
You might even be able to search for JBL patents with the internet, if the USA patent office offers connected services online?
In order for you and others to get an idea of what a patent looks like, i'm attaching the following, its an actual one granted in 1982 i'm using for example, and this being for the GOLLEHON loudspeaker horn patent.
Please don't repost or copy elsewhere.
Richard