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If you are going to drive the speakers at low power levelscompared t=
oconnected to the=
the rated power output of the amplifier, they can be
ohm output without too much of a problem.
If you are going to use more of the rated power of the
the load should be matched to the output impedance to
overheating the output transistors. Adding 4 ohmresistors in series
will work provided that the resistors have an adequatepower rating.
Dr. Mark H. Shapiro
Professor of Physics, Emeritus
California State University, Fullerton
Phone: 714 278-3884
FAX: 714 278-5810
travel and family pictures:
=46rom: Forum for Physics Educators
Behalf Of Matt Hardingare marked a=
Sent: Tuesday, February 17, 2004 12:44 PM
Subject: home stereo impedance matching
I have a pair of old (relatively) Bose 501 speakers that
=3Donly offers 8=
Ohms, that I would like to use with a new receiver that
ohm connections. From what I've been able to establish,
speakers tend to be of the 4 Ohm variety due to greaterpower associa=
=3Dspeakers with my 8
with lower resistance. =3D20
What types of problems can I expect if I use 4 Ohm
Ohm system?not terribly
If my only problem will be reduced performance, then I'm
concerned. If I will cause permanent damage to my newreceiver I thi=
=3Dat 15 Watts)=
I'll leave the speakers in storage.
In the past, my father had wired a 4 Ohm resistor (rated
=3DIs it that
series with the speaker so that the amp would see 8 Ohms.
easy?can be made i=
"An expert is a man who has made all the mistakes which
very narrow field."
- Niels Bohr
=3D46rom: Forum for Physics Educators
Behalf Of Justin Parke
Sent: Tuesday, February 17, 2004 1:54 PM
Subject: Re: rolling
I just discovered that the latest edition of Halliday,
Walker has the correct answers (i.e. .5 L and L) in theback of the
In a message dated 2/4/2004 8:11:12 AM Eastern Standard
FIZIX29@AOL.COM writes:Halliday et al
I need some help with the following question from
ch. 12 question 5:
"A woman rolls a cylindrical drum, by means of a board
distance L/2, which is half the board's length. The
the board does not slide over the drum.
a) What length of board has rolled over the top of
sure I underst=b) How far has the woman walked?"
The answers in the book are L and 1.5 L. I am not
=3Dof the dru=
meant by "what length of board has rolled over the top
to me that it should be L/2. If the questions means
arefar has the =3D3D
moved with respect to the ground then I agree it is L.
Answers in algebraic form (plus verbal explanations)
strictly verbal arguments.
Oakland Mills High School