Yamaha manual 2 34 56, Symmetrical Power Amplifier Circuitry RX-Z9, Effective Linear Damping

Pure Direct			+
			Preout
(2 Channels, L/R)		Pure	-
		Direct	YAC-520
Pure Direct		(2ch)	Volume Control
		Multi-Channel In
(Multi-channel, L/R)
Analog		Analog/DSP
			High-sound quality, high
L/R	Input
	Selector	DSP	reliability gold-plated relays
			Balanced signal transmission
			for lower noise and distortion.

RX-Z9 Front Channel Signal Flow

purest signal quality possible. Pure Direct provides the shortest possible signal path for two-channel or multichannel analogue inputs, with no signal processing and no display. Straight outputs the original analogue or digital signal without any post-processing. i.LINK provides a digital connection for DVD-Audio Linear PCM, Super Audio CD DSD (Direct Stream Digital) and other high quality audio sources. Direct provides a direct connection for analogue stereo/multichannel input and digital stereo/multichannel (via i.LINK) input, with a dimmed display.

Symmetrical Power Amplifier Circuitry (RX-Z9)

The High Current Amplification system uses a symmetrical, full push-pull circuit configuration with a complementary FET input stage. This ensures balanced output with no signal interference and

Basic Circuit Diagram

In	-	NFB	Circuit	Speaker Out
	+		Bias

-B

highest slew rate (rate at which signal changes; affects high frequency response). Furthermore, the massive toroidal transformer and large capacity block electrolytic capacitors (28,000µF) ensure a consistently stable power supply.

Effective Linear Damping

Level variations due to high impedance tend to reduce an amplifier’s damping factor (ability to control unwanted speaker cone movement at low frequencies), and frequency variations cause it to fluctuate. Yamaha’s Linear Damping circuit cancels the effect of these variations, maintaining a high, stable damping factor for superior sound articulation and frequency response.

High Grade Construction with Independent

Chambers and Anti-Vibration Design (RX-Z9)

The RX-Z9 uses a heavy-duty, rigid chassis construction with separate individual chambers for left and right power amplifiers, power supply and control section to prevent any chance of interference. This thick chassis has electromagnetic shielding. The extremely large aluminium-extruded

Preamp Chamber

Video Chamber

DSP Chamber

Digital Home Theatre Technology

heat sinks have anti-resonance characteristics and ensure effective heat dissipation. Yamaha’s ToP-ART base and feet provide stability and further vibration-damping. The other receivers use many of these same design features.

Only the Finest Parts are Used

At this degree of extreme sound quality, each and every part in the receiver makes a difference. Yamaha technicians tested, selected and in many cases custom-designed all parts, and then tested them in groups to ensure that they sounded good together. Particularly noteworthy parts, in addition to the transformer and capacitors, include:

■Schottky Barrier diodes that allow fast switching for high S/N ratio (RX-Z9/RX-V2500).

■High performance FE Mica capacitors and Metric Mylar Film capacitors using polypropylene material.

■Thick PC board wiring with 1.6mm φ diameter copper jumper cables.

■Two direct signal path speaker relays with gold- plated crossover connections and shielding.

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Gold-Plated

Extruded, Extra-

Large Speaker

Terminals

Power Amplifier (Left) with Large, Anti-Resonance, Aluminium-Extruded Heat Sink (Left) Providing Effective Heat Dissipation

Control Section

Two Direct Signal Path Speaker Relays with Gold-Plated Crossover Connection and Shielding

Power Amplifier (Right) with Large, Anti-Resonance, Aluminium-Extruded Heat Sink (Right) Providing Effective Heat Dissipation

2

34

56

(1)	Extra-Large Toroidal Transformer, (2) Extra-Large
Custom-Made Block Electrolytic Capacitors (28,000 µF),
(3)	Gold-Plated Extruded, Extra-Large Speaker Terminals,
(4)	Two Direct Signal Path Speaker Relays, (5) High Sound

Power Supply Chamber with Extra-Large Toroidal Transformer and Extra-Large Custom-Made Block Electrolytic Capacitors (28,000µF)

Quality Schottky Barrier Diode and (6) High Quality Selected

Parts (RX-Z9)

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