LUXMAN M-5

Commentary

This is a stereo power amplifier that focuses on the quality of separation and pursues a grade higher than one class.

The circuit configuration of the power section is 3-stage Darlington configuration for the final stage, and uses a complimentary service circuit with low internal impedance, large current, high fT type <Pc150W, Ic (max) = 15A> power transistor.
It can also be developed as a 300W/8 Ω high-output power amplifier with BTL connection.

CSSC (Complementary Single Stagger Circuit) circuit of pure complimentary service configuration is adopted in order to secure naturally extended frequency characteristics and to realize the rise of high-slew rate sound.
The CSSC circuit is roughly divided into three parts. From the input side, it is a differential-amplifier with an complimentary service structure. The second stage is the current transmission stage, which is the most characteristic of the CSSC circuit. In this stage, a common-base circuit with a transistor is used in high-frequency circuits that require high fT (cutoff frequency) transmission. The final stage is the power amplifier with an output circuit.
Since the ground base circuit has a high cut-off frequency in the high-frequency range, it can be said that the frequency characteristics of the first stage differential amplifier control almost the entire CSSC. Stable operation is ensured with minimal correction, and high slew rate is achieved.

We have succeeded in achieving both stable operation of amplifier circuit by NFB and high musical performance by OD β circuit which ensures sufficient DC stability without intervention of DC servo amplifier by improving bare characteristics of the circuit.

The power supply unit pursues instantaneous power supply capability and stability. The transformer a 300 va EI core transformer with excellent regulation. The secondary side is divided into four windings for each circuit to avoid noise and interference between circuits through the power supply.
In addition, a fast recovery diode is used for the rectifier section, and a block capacitor of a special high-speed charge / discharge type is divided into left and right channels and mounted.

In order to completely eliminate noise and interference, a high-density FRP chassis with 5-point grounding is adopted for the chassis base, and the power supply section is symmetric structure.
The chassis structure is a box isolation structure in which separators are arranged for sections with different roles.

The speaker terminal is equipped with an original large 3-way type that can connect banana chip terminal and Y lug.
The left and right channels are also equipped with input level control, and a 6-contact independent resistance switching type L/R-independent attenuator is used to switch between balanced and unbalanced inputs.

High-quality custom parts such as resistors, capacitors, and input / output terminals are used abundantly.

A line phase sensor is included to enable plug-in with correct polarity.
Proper polarity can be confirmed by indicator display with one touch operation.

As an attached power cable, an original power cable developed by thorough listening test is equipped as standard.
In addition, the AC inlet type allows replacement with other cables.
It also has a wired remote control connection terminal as a power switch function and can be turned on / off in conjunction with line control amplifiers C-10, C-9, C-7 and C-5.

A logarithmic compression type is used for the power meter.

Aluminum panel and wooden cabinet are adopted.

Model Rating

Type	Stereo power amplifier
Continuous effective output	100W + 100W (8 Ω, stereo) 150W + 150W (4 Ω, in stereo) 300W (8 Ω, monaural)
Input sensitivity	1V/100W (8 Ω)
Input impedance	Coaxial : 47k Ω Balance : 80k Ω
Total harmonic distortion factor	0.004% (1 kHz, 8 Ω) 0.005% (20 Hz to 20 kHz, 8 Ω)
Frequency characteristic	20 Hz ~ 29 kHz + 0 -0.1 dB 10 Hz ~ 100 kHz + 0 -1.0 dB
Signal-to-noise ratio	115 dB (1 kHz, IFF-A)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	240W (Electrical Appliance and Material Control Law)
Maximum external dimensions	Width 467x Height 196x Depth 440 mm
Weight	20.0kg