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                                                                     EXHIBIT 4.6

                             SUPPLEMENTAL INDENTURE

                  SUPPLEMENTAL INDENTURE (the "Supplemental Indenture"), dated
as of October 21, 1999, by and between SPANISH BROADCASTING SYSTEM, INC., a
Delaware corporation (the "Company"), the Guarantors and THE BANK OF NEW YORK, a
banking organization organized under the laws of New York, as trustee (the
"Trustee").

                                   WITNESSETH:

                  WHEREAS, in accordance with Section 8.02 of the Indenture,
relating to the 12 1/2% Senior Notes due 2002, (the "Notes") of the Company,
dated as of June 29, 1994, as amended by the First Supplemental Indenture dated
as of March 25, 1996 and the Second Supplemental Indenture dated as of March 21,
1997, by and between the Company, the Guarantors and the Trustee (the
"Indenture"), the Trustee, the Guarantors, the Company and the Holders of more
than a majority in principal amount of the Notes outstanding as of the date
hereof desire to amend certain terms of the Indenture as described below (the
"Proposed Amendments"); and

                  WHEREAS, the Company intends to consummate a series of
reorganization transactions (collectively, the "Reorganization") designed to
simplify its corporate and capital structure, which include among other
transactions: (i) the redesignation of the Company's previously outstanding
shares of Class A Common Stock into shares of Class B Common Stock and the
fifty-to-one stock split of the Company's Class B Common Stock; (ii) an initial
public offering of the Company's Class A Common Stock, par value $.0001 per
share (the "IPO"), as described in the registration statement on Form S-1
originally filed on August 18, 1999 (Registration No. 333-85499), as amended,
with the Securities and Exchange Commission (the "Commission"); (iii) a public
offering by the Company of $235.0 million aggregate principal amount of its
senior subordinated notes due 2009 (the "Debt Offering"), as described in the
registration statement on Form S-1 originally filed on August 18, 1999
(Registration No. 333-85519), as amended, with the Commission; (iv) the use by
the Company of the net proceeds of the IPO to redeem its 14 1/4% Senior
Exchangeable Preferred Stock; and (v) a concurrent tender offer for the
Company's 11% Senior Notes due 2004, Series B (the "11% Notes").

                  WHEREAS, the Company has solicited (the "Solicitation")
consents from the Holders to the amendments contained in this Supplemental
Indenture and the Company has received consents from Holders of more than a
majority in principal amount of the Notes outstanding as of the date hereof; and

                  WHEREAS, the Board of Directors of the Company has authorized
this Supplemental Indenture; and

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                  WHEREAS, concurrent with the Solicitation, the Company has
offered to purchase for cash any and all of the outstanding Notes from the
Holders thereof upon the terms and conditions set forth in the Offer to Purchase
and Consent Solicitation Statement dated September 30, 1999, as amended from
time to time (the "Offer"); and

                  WHEREAS, it is intended that this Supplemental Indenture
become effective upon acceptance for purchase by the Company pursuant to the
Offer of the Notes tendered into the Offer; and

                  WHEREAS, all things necessary to make this Supplemental
Indenture a valid supplement to the Indenture according to its terms and the
terms of the Indenture have been done:

                  NOW, THEREFORE, the parties hereto agree as follows:

                  SECTION 1. Certain Terms Defined in the Indenture. All
capitalized terms used and not otherwise defined herein shall have the meanings
ascribed to them in the Indenture.

                  SECTION 2. Deletion of Certain Definitions. The following
definitions in Section 1.01 of the Indenture are hereby deleted in their
entirety:

                  Acquisition Indebtedness
                  Asset Sale
                  Asset Sale Proceeds
                  Attributable Indebtedness
                  Available Asset Sale Proceeds
                  Change of Control Offer
                  Change of Control Payment Date
                  Change of Control Purchase Price
                  Consolidated Interest Expense
                  Consolidated Net Income
                  Corporate Trust Office
                  EBITDA
                  Excess Proceeds Offer
                  Investments
                  Lien
                  Net Income
                  Offer Period
                  Offering Memorandum
                  Permitted Investments
                  Permitted Liens
                  Property
                  Purchase Date

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                  Reinvestment Date
                  Responsible Officer
                  Restricted Payment
                  Sale and Leaseback Transaction
                  Temporary Cash Investments
                  Units


                  SECTION 3. Waiver of Application of Covenants. Subject to
Section 8(b) hereof, the application of the covenants contained in the Indenture
is hereby waived to the extent required to effect the Reorganization that is
consummated substantially concurrently with the consummation of the Offer (the
"Waiver").

                  SECTION 4. Deletion of Certain Covenants. The text of Sections
4.02 (SEC Reports), 4.03 (Waiver of Stay, Extension or Usury Laws), 4.04
(Compliance Certificate), 4.05 (Taxes), 4.06 (Limitation on Additional
Indebtedness), 4.07 (Limitation on Preferred Stock of Restricted Subsidiaries),
4.08 (Limitation on Capital Stock of Subsidiaries), 4.09 (Limitation on
Restricted Payments), 4.10 (Limitations on Certain Asset Sales), 4.11
(Limitations on Transactions with Affiliates), 4.12 (Limitation on Liens), 4.13
(Limitations on Investments), 4.14 (Limitation on Creation of Subsidiaries),
4.15 (Limitation on Sale and Lease-Back Transactions), 4.16 (Payments for
Consent), 4.17 (Corporate Existence), 4.18 (Change of Control) and 4.19
(Maintenance of Office or Agency) of the Indenture is hereby deleted in its
entirety and is hereby replaced in each such Section, with "[Intentionally
Deleted by Amendment]."

                  SECTION 5. Deletion of Certain Restrictions with Respect to
Consolidations and Mergers. The text of Section 5.01(a)(iii) (Limitations on
Consolidation, Merger, and Sale of Assets) of the Indenture is hereby deleted in
its entirety.

                  SECTION 6. Deletion of Certain Events of Default. The text of
paragraph (3) of Section 6.01 of the Indenture is hereby deleted in its entirety
and is hereby replaced with "[Intentionally Deleted by Amendment]." Any
reference to the text "or any Restricted Subsidiary" in paragraphs 6.01(4), (5),
(6) and (8) is hereby deleted in its entirety.

                  SECTION 7. Deletion of Certain Cross-References. Any reference
to Section 4.02, 4.03, 4.04, 4.05, 4.06, 4.07, 4.08, 4.09, 4.10, 4.11, 4.12,
4.13, 4.14, 4.15, 4.16, 4.17, 4.18, 4.19, 5.01(a)(iii) and 6.01(3) in the
Indenture is hereby deleted.

                  SECTION 8. Effect of Supplemental Indenture. (a) Upon the
execution and delivery of this Supplemental Indenture by the Company, the
Guarantors and the Trustee, the Indenture shall be amended and supplemented in
accordance herewith, and this Supplemental Indenture shall form a part of the
Indenture for all purposes, and every Holder of Securities heretofore or
hereafter authenticated and delivered under the Indenture shall be bound
thereby, as hereby amended and supplemented; provided, however, the Proposed
Amendments, except as described in (b) with respect to the Waiver, shall not
become operative until the Company has notified the Trustee that it has accepted
for payment at least a majority of the outstanding principal amount of the
Securities pursuant to the offer to purchase for cash any and all of the

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Notes, (and at such time the Proposed Amendments shall automatically become
operative without the requirement of any further action by or notice to the
Company, the Guarantor Subsidiaries, the Trustee or any Holder of Securities).

                  (b) The Waiver shall become operative immediately upon
execution and delivery of this Supplemental Indenture by the Company, the
Guarantors and the Trustee. However, if the Offer is terminated or withdrawn or
the tendered Notes are not accepted for payment pursuant to the Offer, the
Waiver will cease to be operative.

                  SECTION 9. Governing Law. This Supplemental Indenture shall be
governed by the laws of the State of New York.

                  SECTION 10. Counterparts. This Supplemental Indenture may be
signed in any number of counterparts, each of which shall be an original, with
the same effect as if the signatures thereto and hereto were upon the same
instrument.

                           [Signature pages to follow]

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                  IN WITNESS WHEREOF, the parties hereto have caused this
Supplemental Indenture to be duly executed as of the date first above written.

                                SPANISH BROADCASTING SYSTEM, INC.
                                a Delaware corporation


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM, INC.
                                a New Jersey corporation


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM OF
                                CALIFORNIA, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM OF
                                FLORIDA, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer
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                                SPANISH BROADCASTING SYSTEM
                                NETWORK, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SBS PROMOTIONS, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                ALARCON HOLDINGS, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SBS OF GREATER NEW YORK, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM OF
                                ILLINOIS, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer
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                                SPANISH BROADCASTING SYSTEM OF
                                GREATER MIAMI, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM OF
                                SAN ANTONIO, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM OF
                                PUERTO RICO, INC. a Delaware corporation


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                SPANISH BROADCASTING SYSTEM OF
                                PUERTO RICO, INC. a Puerto Rico corporation


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer


                                JUJU MEDIA, INC.


                                By:      /s/ Joseph A. Garcia
                                         _______________________________________
                                         Name:  Joseph A. Garcia
                                         Title: Chief Financial Officer
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                                THE BANK OF NEW YORK, as Trustee


                                By:      /s/ Walter N. Gitlin
                                         _______________________________________
                                         Name:  Walter N. Gitlin
                                         Title: Vice President