UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934


                             SOMANETICS CORPORATION
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                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
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                         (Title of Class of Securities)

                                    834445405
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                                 (CUSIP Number)

                                February 16, 2007
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             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this
Schedule 13G is filed:

      [ ] Rule 13d-1(b)
      [X] Rule 13d-1(c)
      [ ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



CUSIP NO. 834445405
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(1)     Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
        (entities only): Merrion Investment Management Company, L.L.C.
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(2)     Check the Appropriate Box if a Member of a Group (See Instructions)
                                                                         (a) __
                                                                         (b) __
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(3)     SEC Use Only

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(4)     Citizenship or Place of Organization:  New Jersey

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                    (5) Sole Voting Power:                              286,550*
Number of Shares    ------------------------------------------------------------
   Beneficially     (6) Shared Voting Power:                            433,264*
 Owned  by  Each    ------------------------------------------------------------
    Reporting       (7) Sole Dispositive Power:                         286,550*
   Person With      ------------------------------------------------------------
                    (8) Shared Dispositive Power:                       433,264*
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(9)     Aggregate Amount Beneficially Owned by Each Reporting Person:   719,814*

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(10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
        (See Instructions):                                                 |X|*

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(11)    Percent of Class Represented by Amount in Row (9):                 5.5%*

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(12)    Type of Reporting Person (See Instructions): IA

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* As of February 16, 2007, (i) certain affiliates (the "Affiliated Entities") of
Merrion Investment Management Company, L.L.C. ("MIM"), held 185,000 shares of
the common stock, par value $0.01 per share (the "Shares"), of SOMANETICS
CORPORATION, a Michigan corporation (the "Company"), (ii) William B. Wigton,
chairman of MIM, held 417,389 Shares, (iii) an immediate family member of Mr.
Wigton held 1,000 Shares, (iv) certain managed accounts of MIM (the "Managed
Accounts") held 101,550 Shares, (v) certain discretionary brokerage accounts
held at an affiliate of MIM (the "Brokerage Accounts") held an aggregate of
14,875 Shares and (vi) certain nondiscretionary accounts held at an affiliate of
MIM (the "Nondiscretionary Accounts") held an aggregate of 27,610 Shares. MIM, a
New Jersey limited liability company and an investment adviser registered with
the Securities and Exchange Commission, serves as the investment manager of the
Affiliated Entities and the Managed Accounts and possesses sole power to vote
and direct the disposition of all Shares held by the Affiliated Entities and the
Managed Accounts. MIM may also be deemed to share the power to vote and direct
the disposition of Shares held by or for the benefit of Mr. Wigton and his
immediate family. Mr. Wigton serves as the investment representative with
respect to the Brokerage Accounts and may be deemed to share the power to vote
and direct the disposition of Shares held in the Brokerage Accounts. Neither of
MIM nor Mr. Wigton possess the power to vote or to direct the disposition of
Shares held by the Nondiscretionary Accounts. Thus, as of February 16, 2007, for
the purposes of Reg. Section 240.13d-3, MIM may be deemed to beneficially own
719,814 Shares, or 5.5% of the Shares deemed issued and outstanding as of that
date. MIM expressly disclaims beneficial ownership of the Shares beneficially
owned and held by, or for the benefit of, Mr. Wigton, his immediate family, the
Brokerage Accounts and the Nondiscretionary Accounts.

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Item 1(a).  Name of Issuer.  SOMANETICS CORPORATION

Item 1(b).  Address of Issuer's Principal Executive Offices.
            1653 East Maple Road, Troy, Michigan 48083-4208

Item 2(a).  Name of Person Filing.
            Merrion Investment Management Company, L.L.C.

Item 2(b).  Address of Principal Business Office or, if None, Residence.
            210 Elmer Street, Westfield, NJ 07090-2128

Item 2(c).  Citizenship.
            Merrion Investment Management Company, L.L.C. is a New Jersey
            limited liability company.

Item 2(d).  Title of Class of Securities.
            Common Stock, par value $0.01 per share

Item 2(e).  CUSIP No.  834445405

Item 3.     If This Statement Is Filed Pursuant to ss.240.13d-1(b) or
            240.13d-2(b) or (c), Check Whether the Person Filing is a:

            Not applicable.

Item 4.     Ownership.

    (a) Amount Beneficially Owned (as of February 16, 2007)      719,814*

    (b) Percent of Class (as of February 16, 2007)                         5.5%*

    (c) Number of Shares as to which such person has:

        (i)   sole power to vote or to direct the vote                  286,550*

        (ii)  shared power to vote or to direct the vote                433,264*

        (iii) sole power to dispose or to direct the disposition of     286,550*

        (iv)  shared power to dispose or to direct the disposition of   433,264*

* As of February 16, 2007, (i) certain affiliates (the "Affiliated Entities") of
Merrion Investment Management Company, L.L.C. ("MIM"), held 185,000 shares of
the common stock, par value $0.01 per share (the "Shares"), of SOMANETICS
CORPORATION, a Michigan corporation (the "Company"), (ii) William B. Wigton,
chairman of MIM, held 417,389 Shares, (iii) an immediate family member of Mr.
Wigton held 1,000 Shares, (iv) certain managed accounts of MIM (the "Managed
Accounts") held 101,550 Shares, (v) certain discretionary brokerage accounts
held at an affiliate of MIM (the "Brokerage Accounts") held an aggregate of
14,875 Shares and (vi) certain nondiscretionary accounts held at an affiliate of
MIM (the "Nondiscretionary Accounts") held an aggregate of 27,610 Shares. MIM, a
New Jersey limited liability company and an investment adviser registered with
the Securities and Exchange Commission, serves as the investment manager of the
Affiliated Entities and the Managed Accounts and possesses sole power to vote
and direct the disposition of all Shares held by the Affiliated Entities and the
Managed Accounts. MIM may also be deemed to share the power to vote and direct
the disposition of Shares held by or for the benefit of Mr. Wigton and his
immediate family. Mr. Wigton serves as the investment representative with
respect to the Brokerage Accounts and may be deemed to share the power to vote
and direct the disposition of Shares held in the Brokerage Accounts. Neither of
MIM nor Mr. Wigton possess the power to vote or to direct the disposition of
Shares held by the Nondiscretionary Accounts. Thus, as of February 16, 2007, for
the purposes of Reg. Section 240.13d-3, MIM may be deemed to beneficially own
719,814 Shares, or 5.5% of the Shares deemed issued and outstanding as of that
date. MIM expressly disclaims beneficial ownership of the Shares beneficially
owned and held by, or for the benefit of, Mr. Wigton, his immediate family, the
Brokerage Accounts and the Nondiscretionary Accounts.

                                      -3-


Item 5.  Ownership of Five Percent or Less of a Class.

         Not Applicable.

Item 6.  Ownership of More Than Five Percent on Behalf of Another Person.

         William B. Wigton, his immediate family member, the Managed Accounts,
the Brokerage Accounts and the Nondiscretionary Accounts may have the right to
receive or the power to direct the receipt of dividends from, or the proceeds
from the sale of, Shares held by or for the benefit of each of them,
respectively.

Item 7.  Identification  and  Classification  of the Subsidiary Which Acquired
         the Security Being Reported on by the Parent Holding Company.

         Not Applicable.

Item 8.  Identification and Classification of Members of the Group.

         Not Applicable.

Item 9.  Notice of Dissolution of Group.

         Not Applicable.

Item 10. Certification.

         By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.













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                                    SIGNATURE


         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


                                February 23, 2007


                                MERRION INVESTMENT MANAGEMENT COMPANY, LLC


                                By: /s/ Randolph Rogers
                                    -------------------
                                    Name:  Randolph Rogers
                                    Title: Chief Financial Officer


      Attention: Intentional misstatements or omissions of fact constitute
                Federal criminal violations (See 18 U.S.C. 1001)













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