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Enhanced Bass Management
The AVR-3300 features superior bass management, which is responsible for ensuring that deep
bass sounds do not arrive at the smaller center, front and surround speakers, at the same time
ensuring that higher frequencies do not arrive at the subwoofer. The AVR-3300's crossover fre-
quency is set at 80 Hz for optimum subwoofer-to-main speakers blend.
During setup, the user can choose Large or Small according to the frequency characteristics of
the system's speakers. A typical system would be configured as follows:
• Subwoofer:
• Main (L/R):
• Center:
• Surround:
However, some users will have large full range left and right speakers, which may even include
amplified woofer sections. In this case, if the user chooses Large for the main left and right
speakers, the subwoofer will only reproduce bass that appears in the LFE ( .1 ) channel. Many
movie soundtracks that are 5.1 encoded actually have little or no deep bass in the LFE channel,
so after a period of inactivity, the subwoofer might go into sleep/standby mode, and then miss
the first few seconds of any LFE content that may appear suddenly.
The AVR-3300 allows the user to alternately select Large for the main left and right speakers
and subwoofer on, and directs low bass within the main left and right channels to go to both the
left and right speakers as well as the subwoofer. Bass content in the LFE channel is routed to
the subwoofer. This can benefit users with large "power-tower"-type main L/R speakers with
amplified woofer sections who also have a separate subwoofer in their system.
Power Supply/Power Amp Sections
The AVR-3300 features a high current, high power, all discrete power amplifier block that fea-
tures identical design and identical performance for all five channels. Featuring high current
wideband discrete power transistors, each amplifier channel is rated at 105 watts into 8 ohms
(RMS), and has lower speaker impedance drive capability, without the need for power limiting
impedance selector switching.
A large, high current 14 lb. power transformer is the heart of the power supply, with multiple
stages and tight supply regulation for all stages. High current, low ESR power supply capacitors
store the DC energy for delivery to the power amp block.
The power amp block features side-mounted power transistors, with a horizontal laminar finned
aluminum alloy heat sink. For cooling, the AVR-3300 incorporates a smart fan system that is
microprocessor-controlled. This remarkable system is designed to keep the power transistors at
correct temperature levels, as well as keeping fan noise from being intrusive during quiet pas-
sages.
The fan is mounted at the front of the power block with the exhaust slots on the rear panel. The
fan has an off setting (passive cooling only), a low setting and a high setting (according to the
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