AMENDMENT NO. 4
SERIES B CONVERTIBLE PREFERRED STOCK PURCHASE AGREEMENT
AMENDMENT NO. 4 to the SERIES B CONVERTIBLE PREFERRED STOCK PURCHASE
AGREEMENT, dated July 29, 2010 (“ Amendment ”), among Echo Metrix, Inc., a Delaware corporation (the “
Company ”) and Rock Island Capital, LLC, and or assigns, a Florida limited liability company (“ Rock Island” or
the “ Buyer ”).
Pursuant to that certain Series B Convertible Preferred Stock Purchase Agreement, dated July 29, 2009,
and entered into by and among the Company and Rock Island, as amended by that certain Amendment No. 1,
Amendment No. 2 and Amendment No. 3 to the Series B Convertible Preferred Stock Purchase Agreement,
dated September 4, 2009, March 4, 2010 and May 28, 2010, respectively, in addition to any and all other
addenda thereto (collectively the “ Agreement ”), the Company has agreed to sell to Rock Island or its designees,
and Rock Island has agreed to purchase from the Company, an aggregate of 550,055 shares of the Company’s
Series B Preferred Stock for an aggregate price of $5,000,000. The parties now desire to enter into this
Amendment to modify the terms of the Agreement as more specifically set forth herein.
All capitalized terms used but not defined herein shall have the meanings assigned them in the Agreement.
NOW, THEREFORE, in consideration of the mutual promises of the parties and the terms and
conditions hereof, the parties hereby agree to amend the Agreement as follows:
1. Amendment to Section 8.1. Section 8.1 of the Agreement shall be deleted in its entirety and, in
lieu thereof, the following new Section 8.1 is inserted:
8.1 By Buyer . In the event that the Buyer shall fail to timely pay any tranche
payment and does not notify the Company in writing at least five (5) days prior to such payment due date
(upon which notice Rock Island shall be granted a 7-day extension), Company may, from and after the