Document:

Exhibit 10.5 

     FOURTH AMENDMENT (the “Amendment”) dated as of November 30, 2009 (the
“Amendment Effective Date”) by and between ADVANCED PHOTONIX, INC., a Delaware
corporation (the “Company”) and STEVEN
WILLIAMSON, an individual (“Holder”), to that
certain SECURED PROMISSORY
NOTE (the “Note”) dated as of May 2, 2005, as
amended by the Amendment dated May 1, 2008, the Second Amendment dated November
26, 2008 and the Third Amendment dated April 1, 2009. 

     The Company
and Holder have agreed to amend and modify the Note in accordance with the terms
and conditions hereinafter set forth. Unless otherwise defined herein,
capitalized terms shall have the respective meanings assigned to them in the
Note. 

     NOW,
THEREFORE, in consideration of the foregoing, the parties, intending to be
legally bound, hereby agree to replace in its entirety Section 1 of the Note as
follows: 

(1) PAYMENT OF
PRINCIPAL. The Principal shall be payable in
annual installments of THREE HUNDRED THIRTY THREE THOUSAND THREE HUNDRED THIRTY THREE DOLLARS ($333,333) on the first
anniversary of the Issuance Date, THREE HUNDRED SIXTY SIX THOUSAND SIX HUNDRED
SIXTY SEVEN DOLLARS ($366,667) on the second anniversary of the Issuance Date,
THREE HUNDRED THOUSAND DOLLARS ($300,000)
on December 1, 2008, THREE HUNDRED THOUSAND
DOLLARS ($300,000) on December 1, 2010, and a final installment of SIX HUNDRED THIRTY THREE
THOUSAND SIX HUNDRED SIXTY SEVEN DOLLARS ($633,667) on March 1, 2011 (the
“Maturity Date”). 

Except to the extent amended hereby, the
Note remains in full force and effect in accordance with its terms and the
Interest Rate (as defined in the Note) will continue to be paid at the rate
prescribed in Section 2 of the Note. The terms and conditions of this Amendment
shall be construed together with the terms of the Note as a single agreement,
provided that, to the extent any terms and conditions of the Amendment are
inconsistent with the terms and conditions of the Note, the terms and conditions
of this Amendment shall govern.

     IN WITNESS
WHEREOF, this Amendment has been executed by the Parties as of the Amendment
Effective Date. 

	 	ADVANCED PHOTONIX, INC.  
  
		 	 	  
				  
		By: 	/s/ 	Richard D. Kurtz  	 
				Richard D.
      Kurtz, 
				Chief
      Executive Officer  
				  
				  
				  
			/s/ 	Steven Williamson  	 
				STEVEN
      WILLIAMSONex10_1.htm

    Exhibit
10.1

     

    LETTER AMENDMENT TO
FORBEARANCE AGREEMENT

     

     

    Dated as of September 14, 2009

     

    
      	
              To:

            	
               the
      Agent and Lenders party to

            

    

    
      	
               
      

            	
               the
      Forbearance Agreement

            

    

    
      	
               
      

            	
               referred
      to below

            

    

    

     

    
      Ladies and
Gentlemen:

    

     

    We
refer to the Forbearance Agreement dated as of September 3, 2009 (the “Forbearance
Agreement”; capitalized terms used herein and not defined herein shall
have the meanings ascribed thereto in the Forbearance Agreement) among BANK OF
AMERICA, N.A., as Administrative Agent and Collateral Agent for the Lenders
under the Credit Agreement referred to therein (in such capacities, the “Agent”), the Lenders
party thereto, NORTEK, INC. (the “Specified U.S.
Borrower”), VENTROL AIR HANDLING SYSTEMS INC. (the “Canadian Borrower”
and, together with the Specified U.S. Borrower and each other Borrower from time
to time party to the Credit Agreement referred to therein, the “Borrowers”), and the
other Loan Parties (as defined in the Credit Agreement referred to
therein).

     

    We
hereby request, and the Required Lenders hereby agree, that the Forbearance
Agreement be hereby amended as follows:

     

    (a) Section 2(g) of the
Forbearance Agreement is hereby amended by replacing “September 15, 2009”
therein with “September 18, 2009”.

    (b) The definition of
“Nortek Plan” contained the Forbearance Agreement is hereby amended by replacing
“September 15, 2009” therein with “September 18, 2009”.

    This Letter
Amendment shall become effective as of the date first above written when, and
only when, the Agent shall have received counterparts of this Letter Amendment
executed by the Loan Parties and the Required Lenders or, as to any of the
Required Lenders, advice satisfactory to the Agent that such Lender has executed
this Letter Amendment.

     

    On and after the
effectiveness of this Letter Amendment, each reference in the Forbearance
Agreement to “this Agreement”, “hereunder”, “hereof” or words of like import
referring to the Forbearance Agreement, and each reference in the Loan Documents
to the “Forbearance Agreement”, shall mean and be a reference to the Forbearance
Agreement, as modified hereby.  The forbearance agreements contained
in the Forbearance Agreement, as modified hereby, shall be binding on all
Lenders in accordance with Section 11.01 of the Credit Agreement.

     

    The Forbearance
Agreement and each of the other Loan Documents, as specifically amended or
otherwise modified by this Letter Amendment, are and shall continue to be in
full force and effect and are hereby in all respects ratified and
confirmed.  The execution, delivery and effectiveness of this Letter
Amendment shall not, except as expressly provided herein, operate as a waiver of
any right, power or remedy of any Secured Party or the Agent under any of the
Loan Documents, nor constitute a waiver of any provision of any of the Loan
Documents.  Nothing contained in this Letter Amendment and no action
by, or inaction on the part of, any Secured Party or the Agent shall, or shall
be deemed to, directly or indirectly (i) constitute a consent to or waiver of
any past, present or future violation of any provision of the Credit Agreement
or any other Loan Document, (ii) except as expressly set forth herein, amend,
modify or operate as a waiver of any provision of the Credit Agreement or any
other Loan Document or of any right, power, or remedy of the Agent or any
Secured Party thereunder or (iii) constitute a course of dealing or other basis
for altering any obligation of the Loan Parties under the Loan Documents or any
other contract or instrument. The Loan Parties and the Required Lenders hereby
agree that this Letter Amendment shall be a Loan Document for all purposes of
the Credit Agreement and the other Loan Documents.

     

    Each Loan Party
ratifies and reaffirms the validity and enforceability (without defense,
counterclaim or offset of any kind and not subject to any avoidance, reduction,
recharacterization, subordination (whether equitable, contractual or otherwise
but subject to the Intercreditor Amendment), counterclaim, cross-claim, defense,
disallowance, impairment, objection or any challenges under any applicable Law
or by any Person) of the Liens and security interests granted to secure any of
the Obligations to and for the benefit of the Secured Parties, pursuant to the
Loan Documents.  Each Loan Party acknowledges and agrees that all such
Liens and security interests granted by it secure, and shall continue to secure,
the Obligations and the Guaranties from and after the date hereof.

     

    This Letter
Amendment may be executed by one or more of the parties to this Letter Amendment
on any number of separate counterparts, and all of said counterparts taken
together shall be deemed to constitute one and the same
instrument.  Any party hereto may execute and deliver a counterpart of
this Letter Amendment by delivering by facsimile transmission or electronic mail
in portable document format a signature page of this Letter Amendment signed by
such party, and such signature shall be treated in all respects as having the
same effect as an original signature.

     

    This Letter
Amendment shall be governed by, and construed in accordance with, the laws of
the State of New York.

     

     

    
      	 
    	
              Very truly
      yours,

               

              NORTEK, INC.,
      as the Specified U.S.

              Borrower and
      as a Guarantor

               

               

              By:  /s/Edward J.
      Cooney

              Name:  Edward
      J. Cooney

              Title:    Vice
      President and Treasurer

            
	 
    	 
    
	 
    	
              VENTROL AIR
      HANDLING SYSTEMS INC.,

              As the
      Canadian Borrower

               

              By:  /s/Edward J.
      Cooney

              Name:  Edward
      J. Cooney

              Title:    Vice
      President and Treasurer

            

    

    

    

    
      	 
    	
              AIGIS
      MECHTRONICS, INC.

              BROAN-MEXICO
      HOLDINGS, INC.

              BROAN-NUTONE
      LLC

              BROAN-NUTONE
      STORAGE SOLUTIONS LP

              CES GROUP,
      INC.

              CES
      INTERNATIONAL LTD.

              CLEANPAK
      INTERNATIONAL, INC.

              ELAN HOME
      SYSTEMS, L.L.C.

              GEFEN,
      INC.

              GOVERNAIR
      CORPORATION

              GTO,
      INC.

              HC
      INSTALLATIONS, INC.

              HOMELOGIC
      LLC

              HUNTAIR,
      INC.

              INTERNATIONAL
      ELECTRONICS, INC.

              LINEAR H.K.
      LLC

              LINEAR
      LLC

              LITE TOUCH,
      INC.

              MAGENTA
      RESEARCH LTD.

              MAMMOTH-WEBCO,
      INC.

              NILES AUDIO
      CORPORATION

              NORDYNE
      INC.

              NORDYNE
      INTERNATIONAL, INC.

              NORTEK
      INTERNATIONAL, INC.

              NUTONE
      LLC

              OMNIMOUNT
      SYSTEMS, INC.

              OPERATOR
      SPECIALTY COMPANY, INC.

              PACIFIC
      ZEPHYR RANGE HOOD, INC.

              PANAMAX
      INC.

              RANGAIRE GP,
      INC.

              RANGAIRE LP,
      INC.

              SECURE
      WIRELESS, INC.

              SPEAKERCRAFT,
      INC.

              TEMTROL,
      INC.

              WDS
      LLC

              XANTECH
      CORPORATION

              ZEPHYR
      CORPORATION

               

            
	 
    	
              as a Borrower
      and Guarantor

               

               

              By:        /s/ Edward J.
      Cooney             

              Name:  Edward
      J. Cooney

              Title:    
      Vice President and Treasurer

               

              (of entity
      listed or as an officer of the managing member, sole member or general
      partner)

            

    

    

    

    

    

    

    
      	 
    	
              BROAN-NUTONE
      CANADA INC.

              INNERGY TECH
      INC.

              VENMAR CES,
      INC.

              VENMAR
      VENTILATION INC.

              VENMAR
      VENTILATION (H.D.H.) INC.

            
	 
    	
              as a
      Guarantor

               

               

              By:   /s/ Edward J.
      Cooney                      

              Name:  Edward
      J. Cooney

              Title:    
      Vice President and Treasurer

            

    

    

    

     

    
      	
               
      

            	
              Acknowledged
      and Agreed:

            

    

    

    
      	
               
      

            	
              BANK OF
      AMERICA, N.A.,

            

    

    
      	
               
      

            	
              as
      Agent

            

    

    

    

    
      	
              By:

            	
              /s/ Richard
      Levenson

            

    

    
      	
               
      

            	
              Name:  Richard
      Levenson

            

    

    
      	
               
      

            	
              Title:    Senior
      Vice President

            

    

    

    
      	
               
      

            	
              BANK OF
      AMERICA, N.A.,

            

    

    
      	
               
      

            	
              as U.S. L/C
      Issuer and Canadian L/C Issuer

            

    

    

    

    
      	
              By:

            	
              /s/ Richard
      Levenson

            

    

    
      	
               
      

            	
              Name:  Richard
      Levenson

            

    

    
      	
               
      

            	
              Title:    Senior
      Vice President

            

    

    

    

    

    Acknowledged and
Agreed:

    

    
      	
              WELLS FARGO
      FOOTHILL, LLC

            
	
               

              By:        /s/ Ilene
      Silberman

              Name:  Ilene
      Silberman

              Title:    
      Vice President

            

    

    

    Acknowledged and
Agreed:

    

    
      	
              WELLS FARGO
      FOOTHILL CANADA ULC

            
	
               

              By:        /s/ Sanat
      Amladi

              Name:  Kurt
      Duerfeldt

              Title:    Vice
      President

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