Pioneer A-D5X

Commentary

This pre-main amplifier realizes further sound quality improvement and high cost performance.

Direct Energy MOS-FET is used for the output stage.
Since the direct energy MOS-FET has a very small resistance value during operation, the power supply voltage can be set to a low value. This minimizes energy loss, which adversely affects sound quality, and realizes excellent power linearity, low load drive capability, and compact circuit.
In addition, they are fixed extruded material heat sinks to eliminate mutual interference.

The chassis is designed to be vibration-free and resonance-free.
It uses an aero wing chassis that disperses and attenuates internal vibration, and stabilizers made of thick steel plates for the volume and transformer mounting parts. In addition, a newly adopted solid brass stabilizer made of solid brass is attached to the bottom of the chassis to improve the strength of the chassis and correct the left and right weight balance.
In addition, copper-plated steel plates are used for the chassis and rear panel.

Wide range linear circuit is used for the circuit structure.
This circuit uses a simple circuit configuration to obtain the necessary gain by current feedback type one stage amplification. This circuit has excellent current linearity and enables a speaker drive with stable output impedance characteristics over a wide range.

The power supply is equipped with a super-ring toroidal transformer.
This transformer realizes a clean power supply because it has low loss and small ーケージフラックス inside the amplifier.
In addition, custom parts developed through thorough trial listening are used for the smoothing capacitor.

Equipped with SB (surround back) mode.
This mode allows all tone control circuits to pass through, creating a simple circuit with only volume and power amplifiers, which can be used as a surround back amplifier.

Uses an inlet type 3P extra-thick OFC power cord.

Speaker terminal for banana plug is adopted.

Uses gold-plated input / output terminals.

Wireless remote control is included.

Model Rating

Type	Pre-main amplifier
Maximum practical power	150W + 150W (EIAJ, 4 ω)
Rated Output (Both channel drive)	110W + 110W (4 ω, 20 Hz to 20 kHz, 0.2%) 60W + 60W (8 Ω, 20 Hz to 20 kHz, 0.05%)
Input Sensitivity / Impedance	Phono MM : 2.8mV/50k Ω CD, Tuner, Line/SB, Tape1/CD-R/MD : 200mV/50k Ω
Phono maximum allowable input	Phono MM : 150 mV (1 kHz, 0.02%)
Output Level / Impedance	Tape1/MD, Tape2/Monitor : 200mV/1k Ω Tape rec : 200mV/1k Ω
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.3 dB CD, Tuner, Line, Tape1/MD, Tape2/Monitor : 5 Hz to 100 kHz + 0 -3dB
Tone control	Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz)
Loudness contour (Vol -30dB)	+ 5 dB (100 Hz), + 3 dB (10 kHz)
Signal-to-noise ratio (IHF, A-network, short circuit)	Phono MM:88dB(at 5mV) CD, Tuner, Line, Tape1/MD, Tape2/Monitor : 108 dB
Speaker load impedance	A, B : 4 Ω ~ 16 Ω A + B : 8 Ω ~ 32 Ω
AC outlet	Power switch interlock : 1 system (100W) Power switch not linked : 1 system (100W)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	160W (Electrical Appliance and Material Control Law) 1W (standby)
External dimensions	Width 420x Height 128x Depth 335 mm
Weight	6.7kg
Attachment	Wireless Remote Control