Amplificator mono Audio Research Reference 250 SE

Amplificator mono Audio Research Reference 250 SE

Scopul unui amplificator monobloc este de a oferi control perfect unei singure boxe. Partea dificila este mentinerea muzicalitatii si a rafinamentului in tot acest proces. Audio Research a construit unele dintre cele mai apreciate produse pe piata in timpul celor 42 de ani de istorie iar 250 SE isi propune sa devina un nou etalon in clasa sa. Din momentul in care muzica se face auzita, microdetaliile, bass-ul substantial si adanc si spatiul dintre performeri si grupuri de instrumente va aduc in fata scenei unui eveniment live. Dinamica excelenta permite trecerea intre pasaje linistite si secvente in forta fara niciun efort. Asta inseamna auditie la inalta rezolutie.
 
Referente 250 SE integreaza toate noile imbunatatiri la exterior alaturi de progresii tehnice avansate la interior. Veti observa, la inceput, un aspect mai monocromatic, mai modern ce include noul panou frontal cu un buton mic de on/off. Un vu-metru analog cu iluminare ajustabila este montat pe partea frontala si afiseaza puterea de iesire alaturi de setarile de bias ale lampilor. Un nou ventilator cu turbulenta redusa aduce o racire eficienta dar silentioasa. Pe interior, Reference 250 SE, are integrate lampi KT150 pe etajul de iesire si un transformator de putere masiv, cu 50% mai mare decat predecesorul sau. Conexiunile includ terminale pentru boxe de 4, 8 sau 16 ohmi, o intrare XLR cat si conexiuni trigger de 12 volti.
 
POWER OUTPUT

250 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 250 watts, below .04% at 1 watt. Approximate actual power available at “clipping” 270 watts (1kHz). (Note that actual power output is dependent upon both line voltage and “condition” i.e. if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not very critical.)

POWER BANDWIDTH

(-3dB points) 5Hz to 70kHz.

FREQUENCY RESPONSE

(-3dB points at 1 watt) 0.5Hz to 110 kHz.

INPUT SENSITIVITY

2.4V RMS Balanced for rated output. (25.5 dB gain into 8 ohms.)

INPUT IMPEDANCE

200K ohms Balanced.

OUTPUT TAPS

4, 8, 16 ohms.

OUTPUT REGULATION

Approximately 0.9dB 16 ohm load to open circuit (Damping factor approximately 10).

OVERALL NEGATIVE FEEDBACK

8.8dB.

SLEW RATE

20 volts/microsecond.

RISE TIME

1.5 microseconds.

HUM & NOISE

Less than 0.2mV RMS – 110dB below rated output (IHF-A weighted, input shorted, 16 ohm output).

POWER SUPPLY ENERGY STORAGE

Approximately 900 joules.

POWER REQUIREMENTS

105-130VAC 60Hz (260-250VAC 50Hz) 770 watts at rated output, 1000 watts maximum, 380 watts at “idle,” 1 watt off.

TUBES REQUIRED

3 Matched pair KT150 (Power output V1-6); 1 Matched pair KT150 (Driver V8-9); 2 6H30 (Gain stage V7 and Regulator Driver V10); 1 6550C (Regulator V11).

DIMENSIONS

19″ (48.3 cm) W x 8.75″ (22.2 cm) H x 19.5″ (49.5 cm) D. Handles extend 1.5″ (3.8 cm) forward.

WEIGHT

73lb or 33,2kg Net; 88 lbs. (40 kg) Shipping.
 
MANUAL