QX-4150
USER MANUAL
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06
QUESTAUDIO.NET
BASIC OPERATION GUIDELINES
Due to the advanced power saving feature of the QX-4150, the amplifier has been designed to power
from the mains with no additional switch. The amplifier has a removable grille on the front panel. The
grille is held in place magnetically and can easily be removed without tools to access controls to engage
a number of modes which are described in the next section. High Pass and Low Pass filters can also be
activated to provide basic frequency dividing functions, these are most commonly used in a system with
sub-woofers.
To avoid harm to connected speakers it is important to not clip the amplifier for extended period of times.
Clipping occurs when the input signal is excessive and overloads the input or output of the amplifier.
To avoid clipping reduce the level of the input. The amplifier has a selectable limit option which can be
engaged to help avoid clipping and it is recommended that this mode is used if the potential exists for
extended periods of overdriving.
The amplifier has a protection circuit which activates when a fault condition exists. The LED will stay
illuminated until the fault is resolved. The protection circuit activates to help prevent damage to the
amplifier and connected speakers. Common causes can be shorted wiring or faulty speakers. If the
Protect light illuminates disconnect the amp from power and then disconnect the speakers. Reconnect
the amp to mains and check the status of the protect LED, if the LED has not turned back on then check
the speakers and cabling for faults.
If the amplifier is to drive high impedance speaker loads (70 or 100v) then Bridge mode must be enabled,
it is possible to have half the QX-4150 running high impedance loads and the other half running low
impedance loads, e.g. Ch 1&2 Bridged 70/100v and Ch 3&4 connected to separate 4/8 ohm loads or
bridged to 4/8 ohm or 70/100v.
