##### 



EXHIBIT 31.1

CERTIFICATION

I, John J. Zei, certify that:

1.     I have reviewed
this annual report on Form 10-K of Knowles Electronics
Holdings, Inc.;

2.     Based on my
knowledge, this annual report does not contain any untrue
statement of a material fact or omit to state any material fact
necessary to make the statements made, in light of the
circumstances under which such statements were made, not
misleading with respect to the period covered by this annual
report;

3.     Based on my
knowledge, the financial statements, and other financial
information included in this annual report, fairly present in
all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the
periods presented in this annual report;

4.     The
registrants other certifying officers and I are
responsible for establishing and maintaining disclosure controls
and procedures (as defined in Exchange Act Rules 13a-14 and
15d-14) for the registrant and we have:



| |                                                                                                                                                                                                                                                                                                                        
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | a.     designed such
    disclosure controls and procedures to ensure that material
    information relating to the registrant, including its
    consolidated subsidiaries, is made known to us by others within
    those entities, particularly during the period in which this
    annual report is being prepared;
|
| | b.     evaluated the
    effectiveness of the registrants disclosure controls and
    procedures as of a date within 90 days prior to the filing
    date of this annual report (the Evaluation Date); and                                                                                                          
|
| | c.     presented in this
    annual report our conclusions about the effectiveness of the
    disclosure controls and procedures based on our evaluation as of
    the Evaluation Date;                                                                                                                                

5.     The
registrants other certifying officers and I have
disclosed, based on our most recent evaluation, to the
registrants auditors and the audit committee of the
registrants board of directors (or persons performing the
equivalent function):



| |                                                                                                                                                                                                                                                                                                                          
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | a.     all significant
    deficiencies in the design or operation of internal controls
    which could adversely affect the registrants ability to
    record, process, summarize and report financial data and have
    identified for the registrants auditors any material
    weaknesses in internal controls; and
|
| | b.     any fraud,
    whether or not material, that involves management or other
    employees who have a significant role in the registrants
    internal controls; and                                                                                                                                                

6.     The
registrants other certifying officers and I have indicated
in this annual report whether or not there were significant
changes in internal controls or in other factors that could
significantly affect internal controls subsequent to the date of
our most recent evaluation, including any corrective actions
with regard to significant deficiencies and material weaknesses.

Date: March 25, 2004



| |     |                
| | --- | ---------------
| | By: | /s/ JOHN J. ZEI

| |                                          
| | -----------------------------------------
| |                                          
| | John J. Zei                              
| | President and Chief Executive
    Officer