Modelo actual del preamplificador principal DENON PMA-SX11 2015
- Marca: Denon
- Código de Producto: E_262245009319
"PMA-SX11" is New Model Products in 2015
Pre-main Amplifier of DENON
High-power pre-main amplifier equipped with "Advanced UHC MOS single push pull circuit" and "CR type Phono equalizer corresponding to MC/MM"
[ The main specification - PMA-SX11 ]
-Advanced UHC MOS single push pull circuit
-Clean and strong power supply circuit
-Aluminum die casting case enclosure power transformer
-CR type Phono equalizer corresponding to MC/MM
-The large analog type volume
-Direct mechanical ground construction
-Balance input and external preamplifier input
[ Main specification ]
■ The power amplifier part
A rated output 120 W + 120 W (8 Ω, 20 Hz - 20 kHz and THD 0.1 %).
240 W + 240 W (4 Ω, 1 kHz and THD 0.7 %)
The whole higher harmonic distorted rate 0.01 % (the rated output and the time of-3 dB), 8 Ω of load and 1 kHz
An output terminal Loudspeaker load : 4 - 16 Ω.
The input sensitivity/input detector EXT. The PRE: 1.1 V / 23 k ohm
Gain value : 29 dB
■ The preamplifier part
Recording output terminal 150 mV
The input sensitivity/input detector The PHONO (MM) : 2.5 mV / 47 k ohm
PHONO (MC): 200 μ V / 100 The ohm (High) and 200 μ V / 50 The ohm (Low).
CD, NETWORK, TUNER, AUX and RECORDER: 165 mV / The 25 k ohm
The BALANCED: 165 mV / 100 k ohm
The RIAA deviation (PHONO MM / MC):± 0.5 dB (20 Hz - 20 kHz)
The biggest input PHONO (MM): 130 mV / 1 kHz
PHONO (MC): 10 mV / 1 kHz
■ The overall special quality
S / N ratio (IHF A network is taken 8 Ω.) PHONO (MM): 82 dB (input terminal short and input signal 5 mV)
PHONO (MC): 70 dB (input terminal short and input signal 0.5 mV)
CD, NETWORK, TUNER, AUX and RECORDER: 108 dB (input terminal short)
A frequency response 5 Hz - 100 kHz (0 - -3 dB).
■ Synthesis
Overall size (W x H x D) 435 x 181 x 506 mm
Mass 27.4 kg.
Power consumption 380 W (by Electrical Appliance and Material Safety Law).
A standby power requirement 0.1 W / 0.2 W (Automatic, stand-by mode When it's on,/when it's off.)
An attachment Easy start guidance, instruction manual, remote control and single 4 shape dry batteryx 2 and power cord.
-Attention Buyer-
This product is a product of the 100V specification for Japanese markets.
Therefore the down transformer which is changed to the voltage of the used country is needed.
And a manual which attaches is transcribed in Japanese.
- Advanced UHC MOS single push-pull circuit
- Clean and powerful power circuit
- Sand type aluminum casting case enclosed power transformer
- MC / MM compatible CR type phono equalizer
- Large analog volume
- Direct mechanical ground construction
- Balanced input & external preamp input
High power integrated amplifier equipped with Advanced UHC MOS single push-pull circuit and CR type phono equalizer for MC / MM
Main features
Advanced UHC-MOS single push-pull circuit
In order to achieve both "delicateness and strength" at a high level, a UHC-MOS (Ultra High Current MOS) FET with excellent linearity from a minute region to a large current region and capable of passing a large current is installed in the output stage. The simple circuit used by a single push-pull is adopted. In order to solve the muddy sound due to the variation in the performance of the elements, which is a problem in the method of driving a large number of elements in parallel to obtain a large current, and to realize the expressive power to draw the delicate expression of the musical sound, Denon 1 We have continued to stick to amplification by the smallest unit of elements called pairs. The latest generation UHC-MOS FET which is also used in PMA-SX1 is adopted as this machine. Compared to conventional products, the rated current has been doubled from 30A to 60A, and the instantaneous supply current has been doubled from 120A to 240A, achieving even more generous playback. Furthermore, the voltage applied to UHC-MOS is kept constant by the cascode bootstrap connection, the temperature stability is improved, and the excellent acoustic characteristic of UHC-MOS is stably drawn out. By using a large aluminum extruded material for the heat sink to improve heat dissipation and giving the power supply circuit sufficient power supply capacity, a large output of 120 W / 8 Ω and 240 W / 4 Ω is realized. Even inefficient speakers can be driven with a margin.
Power amp block
UHC-MOS FET
Sand type aluminum casting condenser holder
Clean and powerful power circuit
The operation of an amplifier is like "enlarged copy" of the input signal to the current supplied by the power supply circuit. If the power supply current is dirty, the signal will be copied on top of the dirt. Also, if a sufficient amount of current is not supplied from the power supply, the copy will be cut or distorted in the middle, that is, accurate amplification will not be possible. In this machine, the power supply section separates the output stage, which requires a large current, and the voltage amplification stage, which requires stability, from the winding stage of the transformer. The capacitor for rectification is a combination of a large-capacity high-quality electrolytic capacitor that uses a low-impedance electrode foil and a high-quality capacitor with different frequency characteristics to improve the sound quality. In addition, a low-loss, low-noise, high-speed Schottky barrier diode is used for the rectifying element. A sufficient and clean current supply is achieved.
Sand type aluminum casting case enclosed power transformer
The power transformer is not only a source of power for the amplifier but also a source of unwanted vibration and noise. Similar to PMA-SX1, this machine is made of sand-type aluminum casting case filled with special resin to eliminate vibration generated from the power transformer, and a careful magnetic shield suppresses noise in the housing caused by leakage magnetic flux and is clean. We are supplying power. A transformer with an extra-thick winding that is evenly wound with a margin produces a clear and powerful sound. A sand casting holder is also used to fix capacitors that are easily affected by vibration. Thorough vibration-compatible design realizes clear reproduction without turbidity.
Sand type aluminum casting enclosed power transformer
6-block chassis
A 6-block chassis with a phono equalizer, input section, volume control section, voltage amplification section, power amplification section, power supply section, and control section arranged independently is adopted. The chassis made of 1.6mm thick steel plate protects a signal circuit from external vibration, and also eliminates the influence of interference between each circuit.
Phono equalizer & input section
Stabilized power supply for phono equalizer
MC / MM dedicated input terminal
CR type phono equalizer
The phono equalizer equipped with a dedicated input terminal for each of MC and MM is equipped with a CR type equalizer circuit equipped with a head amplifier of three dual FET differential input circuits connected in parallel. Flat playback is possible without the difference in tone between the low and high frequencies, which is an issue for the NF type. The MC input terminal is also equipped with input impedance switching. In addition to medium to high impedance cartridges such as "DL-103", low impedance cartridges of about 2 to 10Ω such as overseas high-end brand cartridges are also supported with the optimum input impedance. Carefully selected high-quality sound components are used for the CR element. You can enjoy the sound of analog records with a relaxed and straightforward sound quality. Moreover, the dedicated stabilized power supply is carried in order to operate the phono equalizer circuit which handles a delicate signal stably. Since it is an independent power supply, interference with the playback signal is eliminated by stopping the power supply to the phono equalizer circuit when playing back other sources such as a CD.
Large analog volume
The volume uses an audio-grade motorized volume that uses a multi-contact wire brush. Since the analog type volume that Denon continues to stick to does not require an input buffer circuit, it has the advantage of being able to have a simpler circuit configuration than the digital volume. Also, in the structure, in order to eliminate the mixing of external vibration and external noise, a robust front panel with a maximum thickness of 6 mm and a machined knob made of solid aluminum have been adopted to thoroughly eliminate elements that lead to sound quality deterioration.
Machined solid aluminum volume & selector knob
Cast iron foot
Direct mechanical ground construction
The internal vibration source is placed near the foot, and a direct mechanical ground construction that allows vibration to escape to the ground is adopted. The power supply is installed in a sub-chassis with a hybrid layer structure that has been floated using different materials. While eliminating the propagation of vibration to an amplifier circuit, the power supply circuit is protected from the vibration flowing in from the outside. Furthermore, pure reproduction is realized by thorough vibration countermeasures such as the cast iron foot used in PMA-SX1 and the top panel with finely adjusted air hole dimensions to disperse the resonance frequency.
Balanced input
This unit is equipped with a balanced input terminal in addition to the unbalanced input terminal. Since the balanced terminal has a 3-pin structure, the audio signal can be transmitted as a balanced signal, and the influence of external noise can be reduced. In addition, because it is equipped with a detachable lock mechanism, there is little wobbling of the connector part, and it has the advantage of high reliability. In addition, this unit is equipped with a phase selector switch to support various input devices. You can handle both HOT No. 3 which is often found in domestic products and HOT No. 2 which is often found in imported products by simply switching the switch on the rear panel.
Balanced input terminal
EXT. PRE input terminal
External preamplifier input terminal
Equipped with a fixed gain input "EXT. PRE" input terminal that can be used as a power amplifier by connecting to an external preamplifier. It is convenient to use with a home theater system, such as connecting the pre-out of an AV amplifier and sharing the front speakers.
Large speaker terminal
The speaker terminal is equipped with a large terminal that can firmly tighten the thick Y lug and extra-thick cable, which was also used in PMA-SX1. Gold-plated treatment prevents aging deterioration and realizes long-term reliable connection. In addition, by arranging the terminals in a horizontal row, you can easily and securely connect the cables.
Large speaker terminal
illumination
A solid design that eliminates unnecessary decoration
The front and side panels made of thick solid aluminum give a high-quality feel and a profound feeling, and at the same time, they greatly contribute to sound quality by controlling unnecessary vibration and suppressing external noise.
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