It's available here for $159.
From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Thomas Stern
Sent: Tuesday, September 08, 2015 10:02 AM
To: [log in to unmask]
Subject: [ARSCLIST] Encyclopedia of Recorded Sound - Hoffman Routledge, 2005 2nd edition, 2 vols.
I've seen bits of this in google books when searching. There is a library
discard available, and am wondering if anyone has opinions on the
value of this publication.