Sparton (SPA) 8-K/A Index to Consolidated Financial Statements

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Sparton Corporation

Schaumburg, Illinois

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-82380, 333-156388 and 333-164057) of Sparton Corporation of our report dated January 31, 2013, relating to the consolidated financial statements of Onyx EMS, LLC, which appears in this Form 8-K/A.

/s/ BDO USA, LLP

Grand Rapids, Michigan

January 31, 2013