Read JBL 250 Ti (serv.man2) User Guide / Operation Manual online
6
system will play without distortion. More important than
the power rating is the quality of
the power rating is the quality of
sound the amplifier is
capable of, or its
dynamic power capability. Since am-
plifier specifications are not a reliable indicator of sound
quality, an amplifier should be chosen only after careful
listening. If it can achieve the desired volume level without
distortion, then the amplifier has sufficient power, regard-
less of its rating. Your JBL 250Ti Jubilee dealer can make
recommendations and arrange auditions to help you select
suitable amplification for your system.
quality, an amplifier should be chosen only after careful
listening. If it can achieve the desired volume level without
distortion, then the amplifier has sufficient power, regard-
less of its rating. Your JBL 250Ti Jubilee dealer can make
recommendations and arrange auditions to help you select
suitable amplification for your system.
NOTE: If four amplifier channels are used, the high-fre-
quency amplifier may be up to 6dB less powerful than the
low-frequency amplifier. This is because the low-frequency
section requires approximately four times the power of the
high-frequency section, due to the power versus frequen-
cy distribution of music. For example, if a 200-watt low-
frequency amplifier is used, a 50-watt high-frequency
amplifier will clip, or “run out of power” at approximately
the same level, when playing music.
low-frequency amplifier. This is because the low-frequency
section requires approximately four times the power of the
high-frequency section, due to the power versus frequen-
cy distribution of music. For example, if a 200-watt low-
frequency amplifier is used, a 50-watt high-frequency
amplifier will clip, or “run out of power” at approximately
the same level, when playing music.
Do not use fuses or circuit breakers of any kind
between the amplifier and loudspeakers. Such devices will
seriously degrade the sound quality and do not ensure
protection from loudspeaker damage. The key to safe
operation is having adequate amplifier power to avoid dis-
tortion at the highest sound levels required.
seriously degrade the sound quality and do not ensure
protection from loudspeaker damage. The key to safe
operation is having adequate amplifier power to avoid dis-
tortion at the highest sound levels required.
Biased Crossover Battery Replacement
The crossover network in the 250Ti Jubilee uses a 9V
battery to maintain a charge on the capacitors used in the
midrange, high-frequency and ultrahigh-frequency circuits.
The purpose of this charge is to allow the capacitors to
operate in a “class A” mode. This treatment gives the sys-
tem greater detail and spatial properties than a traditional
network. The current drain on the battery is extremely
small. The average battery life is 3 to 4 years. When
replacement is required, remove the two top center
screws on the network cup and carefully lift off the curved
battery cover. The battery is held in a clip on the left side
of the network. Simply remove the old battery and replace
it with a new one. Reinstall the cover and screws.
battery to maintain a charge on the capacitors used in the
midrange, high-frequency and ultrahigh-frequency circuits.
The purpose of this charge is to allow the capacitors to
operate in a “class A” mode. This treatment gives the sys-
tem greater detail and spatial properties than a traditional
network. The current drain on the battery is extremely
small. The average battery life is 3 to 4 years. When
replacement is required, remove the two top center
screws on the network cup and carefully lift off the curved
battery cover. The battery is held in a clip on the left side
of the network. Simply remove the old battery and replace
it with a new one. Reinstall the cover and screws.
BATTERY
BI-AMP
High Frequency
Low Frequency
NORMAL/
BI-WIRE
BI-WIRE
JBL2516 250TIjubileemanual 7/20/98 11:19 AM Page 6
Click on the first or last page to see other 250 Ti (serv.man2) service manuals if exist.