Operation; Amplifier Power - JBL L1 Owner's Manual

Through an algebraic formulal,
combined nominal speaker imped-
ances (created by connecting two
,;-sêts of speakers to an amplifier)
prodqcg, a lpwer total impedance
than just one set For example,
two sets of 8-ohm speakers result
in a 4-ohm combined impedance.
lf the combined impedance of
one L Series speaker and one o<-
tension speaker is lower thon the
recommended minimum load, your
amp/receiver may not be able to
produce any appreciable volume
before triggering its internal
protection circuits or fuse.
After determining the Nominol
lmpedonce of the extension speak-
ers and tlre minimum allowable
load impedance tlrat the amp/
receiver can handle, consult the
chart at rþht. lt indicates the
impedance of extension speakers
which can be played at normal
volumes sìmultaneously with the
L Series speakers in your main
listening room.
lf your amplifìer is r¿ted for iust
&-ohm loads...combine
Ll's with l6-ohm extension
speakers only.
L3's with
l6-ohm octension
speakers only.
L5's witJr
l6-ohm extension
speakers only.
L7's with l6-ohm octension
speakers only.
lf your amplifier is rated for 4-ohrn as
well as 8æhm loads, combine...
Ll's with l6-ohm or 8-ohm
extension speakers.
L3's with l6-ohm or8-ohm
e><tension speakers.
L5's with
l6-ohm octension
speakers only.
L7's with
f 6-ohm extension
speakers only.
lf your amplifier is rated for 2+hm,4-
ohrn and S<,hm loads, combine.. .
L |
's
with | 6-ohm, 8-ohm or
4-ohm extension
speakers.
L3's with l6-ohm,8-ohm or
4-ohm extension
speakers.
L5's with
l6-ohm or 8-ohm
octension speakers.
L7's with l6-ohm or 8-ohm
octension speakers.
NOTE: lf your receiver is not
raæd for the kind of exænsion
speakers you'd like to add,or if you
want to power many sets of speak-
ers at once all over your house,
you will need a special impedance
matching/switching box Consult
yourJBL dealer for more
information. Also, avoid the
temptation to hook any more than
one set ofspeakers up to each set
of amp/receiver speaker terminals
no matter what the amp/receiver's
minimum rated load impedance is.
OPERATION
Amplifier power
Each L Series speaker has a
maximum and minimum power
råting. Using more power than the
rating listed on page 12 of this
manual for your particular model
can lead to potential damage. That
doesnt mean you cant use,for ex-
ample, 20O-watt-rated L |
's
with a
250-watt amplifier: lt DOES mean
that you must be careful and not
turn up the volume so high that its
output o<ceeds the maximum
recommended power for your
particular L Series speakers.
È
While using a very low pbwered
amplifìer at high volumes probably
wont damage L Series speakerc, it
can produce an unpleasant audible
effect called "clipping." lf the speak-
ers sound fu:zy or distorted when
the amp's volume control is turned
up, you're hearing advanced clip-
ping.lf this effect occurs and you
wish to regularly enjoy your new
JBL speakers at extremely high vol-
ume levels, invest in an amplifier
witlr more RMS wattage output
The extra reseryes of power will
reduce clipping, improve overall
sound and let you get the loudness
you want without unpleasant
distortion.
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