Supplement to Prospectus Dated May 1, 1998
                       Supplement dated November 13, 1998

This Supplement should be retained with the current Prospectus for your variable
annuity  contract  issued  by  American   Skandia  Life  Assurance   Corporation
("American  Skandia").  If you do not have a current prospectus,  please contact
American Skandia at 1-800-SKANDIA.

Notice of Proxy
Contract   Owners  with  Account  Value   allocated  to  the  Founders   Capital
Appreciation   Sub-account   and/or  the  Robertson   Stephens  Value  +  Growth
Sub-account  as of  November  13,  1998  ("record  date")  will be  receiving  a
solicitation  of  proxy  as  beneficial   owners  of  units  of  the  respective
Sub-accounts   that  invest  in  underlying   shares  of  the  Founders  Capital
Appreciation  and/or  Robertson  Stephens Value + Growth  portfolios of American
Skandia Trust ("shareholders").

Shareholders of the Founders Capital  Appreciation  portfolio are being asked to
appoint Janus Capital Corporation as the new portfolio sub-advisor and to change
the  portfolio's   investment  objective  and  certain  fundamental   investment
restrictions. In connection with the proposed changes, the portfolio's name will
be changed to "AST Janus Small-Cap Growth."

Shareholders of the Robertson  Stephens Value + Growth portfolio are being asked
to appoint OppenheimerFunds, Inc. as the new portfolio sub-advisor and to change
the  portfolio's   investment  objective  and  certain  fundamental   investment
restrictions. In connection with the proposed changes, the portfolio's name will
be changed to "AST Oppenheimer Large-Cap Growth."

Contract  Owners who choose to  allocate  Account  Value to either the  Founders
Capital  Appreciation  Sub-account  or the  Robertson  Stephens  Value +  Growth
Sub-account after the record date will not receive a proxy solicitation and will
not be entitled to vote on the changes  outlined  above.  Contract Owners should
take this into consideration if they are considering allocating Account Value to
either the Founders Capital  Appreciation  Sub-account or the Robertson Stephens
Value + Growth Sub-account.

ASAP/ASAP2/ASXT/ASL/ASImpact/ASPro/CH2 (11/98)