Accuphase P – 6100 stereo

Planet Audio
Planet Audio
Planet Audio
Planet Audio
Planet Audio

Najnoviji na popisu izlaznih pojačala s Accuphaseovim logom je model P-6100. Radi se o MOS-FET pojačalu ustrojenim potpuno balansirano, u konfiguraciji koju u Accuphaseo nazivaju „instrumentation”. Takav ustroj rezultira odličnim CMRR-om (common mode rejection ratio), minimalnim izobličenjima signala i gotovo posvemašnim dokidanjem utjecaja bilo kakvih štetnih vanjskih upliva. Posljedica svega je drastično poboljšanje radne postojanosti i pouzdanosti pojačala.
Dodatno unaprijeđena Accuphaseova MCS+ (Multiple Circuit Summing) topologija počiva na korištenju niza istovjetnih sklopova povezanih paralelno kako bi se ostvarile superiorne rade osobine. Poboljšanja u bias sklopu spremniku ulaznog stupnja pridonose povećanju radne stabilnosti, što ujedno omogućava proširenje paralelnog rada i u pobudnom sklopu strujno/naponskog pretvarača u A klasi, što pak dovodi do dodatnog snižavanja praga šuma. U P-6100 pojačalu za povratnu vezu, umjesto obično korištenog napona, koristi se struja. Zato što je impedancija tako ustrojenog sklopa vrlo niska, gotovo da nema faznog pomaka. P-6100 je zapravo stereo verzija cijenjenih i hvaljenih M-6000 monoblokova. MOS-FET tranzistori izabrani su zbog odličnog frekvencijskog odziva i visoke ulazne impedancije koja smanjuje opterećenje pobudnog stupnja. Rade u paralelnoj push-pull konfiguraciji, što omogućava da glazbeni zapis iz  zvukovnog izvora u zvučnički sustav bude prenesen istim kakav je i došao u pojačalo, samo pojačan. P-6100 stereo pojačalo snage može raditi i na 1 ohm (samo s glazbenim signalima, upozoravaju u Accuphaseu!) pri čemu razvija upečatljivih 2 x 700 watta. Pojačalo je moguće premostiti i pretvoriti u monoblok koji će pri impedanciji od 8 ohma davati 440 W snage. Masa ovog suvremeno dizajniranog pojačala privlačnog retro izgleda je 42.7 kg, a dimenzije 465 x 221 x 499 mm.

 

The P-6100 is a stereo version of class AB monophonic power amplifier M-6000, inheriting its outstanding design technology. It features instrumentation amplifier topology and a further refined MCS+ circuit, as well as the current feedback principle to minimize noise.

In the output stage, high-power MOS-FET devices renowned for their great sound and utter reliability are used. MOS-FETs have excellent frequency response and high input impedance which reduces the load on the preceding driver stage. They also have perfect thermal stability. In each channel of the P-6100, 16 of these devices are arranged in an8-parallel push-pull configuration.

The massive heat sinks on both sides of the chassis achieve efficient dissipation of thermal energy and ensure stable operation. This allows the amplifier to deliver an amazing 700 watts of power per channel into an ultra-low impedance load of 1 ohm (music signals). The linear power progression with a rating of 440 watts into 2 ohms,220 watts into 4 ohms, and 110 watts into 8 ohms means that the amplifier can competently handle even speakers with very low impedance or with difficult impedance curves.

Rated Continuous Average Output Power (at 20 – 20,000 Hz) Stereo
use: 700 W/ch 1-ohm load (both channels operating 440 W/ch 2-ohm load
simultaneously) 220 W/ch 4-ohm load 110 W/ch 8-ohm load Monophonic use: 1,400 W 2-ohm load (Bridge connection) 880 W 4-ohm load W 8-ohm load
Total Harmonic Distortion Stereo use (both channels operating simultaneously)0.05% 2-ohm load0.03% 4 to 16 ohm load Monophonic use (Bridge connection) 0.03% 4 to 16 ohm load
IM Distortion 0.01%
Frequency Characteristics At rated continuous average output: 20 – 20,000 Hz +0, -0.2 dB At 1-W output: 0.5 – 160,000 Hz +0, -3.0 dB
Gain 28 dB (when GAIN switch set to MAX)(Same for both stereo and monophonic use)
GAIN switch settings MAX, -3 dB, -6 dB, -12 dB
Load Impedance Stereo use: 2 – 16 ohms Monophonic use: 4 – 16 ohms
Damping Factor 500 (Same for both stereo and monophonic use)
Input Sensitivity (at 8-ohm load, with GAIN switch set to MAX) Stereo use 1.18 V at rated continuous average output 0.11 V at 1-W output Monophonic use 2.36 V at rated continuous average output 0.11 V at 1-W output
Input Impedance Balanced: 40 k ohms Line (Unbalanced): 20 k ohms
S/N (A-weighted) 120 dB when GAIN switch set to MAX125 dB when GAIN switch set to -12 dB(At rated continuous average output)
Output Meters Logarithmic
compression type; illumination turn-off capability; -60 dB to +3 dB
(indication in both dB and %); switchable peak hold time: 3 sec, ∞
Power Requirements AC 120 V/230 V, 50/60 Hz(Voltage as indicated on rear panel)
Power Consumption 170 W (with no input)670 W in accordance with IEC 60065
Maximum Dimensions 465x221x499 mm
Mass 42.7 kg (94.1 lbs) net51.0 kg (112.4 lbs) in shipping carton