Marantz professonal PA02
¥ 250,000 (released in 2002)
Commentary
A monitor amplifier developed for large / small monitors of studios, etc., and for small SR.
The amplifier consists of an all-Non-NFB discrete amplifier, and realizes frequency characteristics extending up to the MHz band and overwhelming high-speed response.
NFB is a technology that cancels out the distortion by inverting the output of the amplifier and returning it to the input again. It is adopted in most audio amplifiers. In this method, static characteristics such as distortion and frequency characteristics can be improved as the amount of NFB is increased. However, dynamic characteristics are deteriorated by stabilizing a large amount of NFB. Even if an amplifier circuit or power supply is composed of high-speed elements, its ability cannot be demonstrated and it cannot follow music signals that change instantaneously.
In the PA series, not only the current amplifier stage but also the voltage amplifier stage are all Non-NFB configuration which completely eliminates NFB, so the linearity of input / output is greatly improved.
The power supply section is equipped with a fully balanced 700 VA R core transformer and 470 μ F/100Vx28 electrolytic capacitors, and is a ± separate rectified high-speed power supply.
It is equipped with a multi-speed cooling FAN system that adjusts the speed according to the temperature and output. This optimizes the device temperature and balances reliability and quietness.
It can also be used as a monaural high-power amplifier with BTL connection by switching the front panel selector.
Can be mounted in standard 19-inch racks
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Model Rating
| Type | Stereo power amplifier |
| Rated output | 180W + 180W (8 Ω) 230W + 230W (6 Ω) 300W + 300W (4 Ω) 350W + 350W (3 Ω) 700W (BTL mono, 6 Ω) |
| Total harmonic distortion factor | 0.07% (Half Power Stereo, 8 ω, 20 hz to 20 khz) |
| Frequency characteristic | 5 Hz ~ 240 kHz + 0 -1dB |
| Output bandwidth | 10 Hz ~ 120 kHz (90W) |
| Signal-to-noise ratio | 120 dB (A-curve correction) |
| Input Sensitivity / Impedance | 0 dB (0.775 Vrms) / 10k Ω (unbalanced) -6dB (0.388 Vrms) / 20k Ω (balanced) |
| Maximum voltage gain | 35.0 dB (Volume max, 1 kHz, unbalanced) |
| Input switching | Unbalanced/Balanced/BTL (Switched by rear slide switch) |
| Indicator | Power, Clip, Temp |
| Protection circuit | DC detection, thermal, eddy current detection |
| Cooling system | Forced air cooling (equipped with continuously variable multi-speed cooling FAN) |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 440W (Electrical Appliances and Materials Safety Act) |
| Maximum external dimensions | Width 486x Height 103x Depth 420 mm |
| Weight | 13.8kg |
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