Integrated Amp "Direct Amp No.290 MK2"

 
   

* Tight, deep bass, precise, transparent, spatial and dynamic reproduction of music, 
  exact timing with live-character


* High current capability and damping factor, especially for low-efficient loudspeakers 
  with critical or low impedance

* High stability driving capacitive loudspeaker loads

* Motor-driven ALPS high grade potentiometer 

* Channel separated professional class A input circuits 

* Extremely linear class A current mirror driver stages and altogether 8 to very high

  quiescent current adjusted power mosfets determine lowest distortion level

  and a sweet tempered harmonic spectrum 

*  Separated power supplies for left and right poweramp-sections, separated power

  supplies for preamp-section and remote control, fast recovery diodes,

  gigantic total power supply capacity of more than 80 000 Microfarads

* Shielded, plastic moulded 500VA torroid transformer with galvanically 
   isolated coils for the left and right poweramp-sections and galvanically isolated coils 
   for the preamp-section and the remote-control-section


* An intelligent security circuit controls loudspeaker outputs with 2 paralleled
  relais for each channel with gold plated contacts

* Switchable damping factor characteristic for perfect loudspeaker matching

* Gold plated cinch input jacks and 63 Amperes binding posts 

* Remote control: IR-transmitter to handle volume and the 
  input selection. The transmitter is learnable/programable


* Noble, high glossy black acryl front, massive, solid high-end-casing with resonance 
  absorbing polished chrome feet 


* Every device comes along with "its own" original measuring record of the frequency response, 
  further measuring records are available on reques


Special technical features:

A professional class A input circuit with an extremely 
linear class A current mirror (driver stage) for each channel 

ALPS high grade stereo-potentiometer for volume

2 paralleled loudspeaker relais with big
gold plated contacts for each channel

Gold plated cinch input jacks and massive,
gold plated 63 Amps binding posts

Gigantic, current capable torroid transformer with
galvanically isolated coils for the left and the right channel
and the preamp section

Massive resonance absorbing chrome feet

Greatly dimensioned, twice ribbed, special-coated
high efficiency heat sink with rounded ribs

IR remote control
IR-transmitter to handle volume and the input selection
The IR-transmitter is free programmable an learnable
and is delivered without batteries

Specifications:


Inputs:
2 line level inputs (cinch)

 

Gain error (left to right channel): < 0,7 dB from 0 to -40 dB 

Input resistance: nominal 100 kOhms, inputs AC-coupled

 

Damping factor at 1 kHz: switchable: 470 or 250 (measured with 8,00 Ohm resistor at 10 Watts)

 

Output power (sinus) at 1kHz: 210 Watts (29,0 Veff) into 4 Ohms each channel,
                                                140 Watts (33,5 Veff) into 8 Ohms each channel

                                                 (THD+N = 0,2 %, with nominal mains voltage)

                                     
Diagram: Frequency response at 10 Watts into 4 Ohms: 2,6 Hz - 70 kHz -3 dB

                (one channel shown in diagram)

Risetime/falltime: 4,75 µsec into 4 Ohms load (square wave 20 kHz, 12 Vss, measured from 10 % to 90 %)

 

Max. DC Output offset: +/- 22 mV

 

Crosstalk: 84 dB (input 2,0 Veff, opposite channel with 40 Ohms loaded, (at 1 kHz, left/right, right/left)

                 test setup grounded, output load 4 Ohms each channel)

 

Signal to noise ratio: -94 dB (A-weighted, ref. to 6,325 Veff, inputs with 40 Ohms loaded, test setup grounded)

 

Total harmonic distortion (THD+N): into 4 Ohms: 0,0075 %, into 8 Ohms: 0,005%
                                                        (measured at 1 kHz and 10 Watts, test setup grounded,
                                                         measuring bandwidth 22 Hz - 22 kHz)

Quiescent current: left: 276 +/- 3 mA, right: 262 +/- 3 mA  (after a warm-up time of 90 min, at nominal mains voltage minus 3 V AC)
                              (values for items with "predelay")


                               left: 270 +/- 3 mA, right: 262 +/- 3 mA  (after a warm-up time of 90 min, at nominal mains voltage minus 3 V AC)
                              (values for items without "predelay"
)

                                     
Diagram: Harmonic spectrum at 10 Watts into 4 Ohms (1 kHz) 

Security circuit disconnects loudspeakers:


* when device is switched on for a delayed switch-on of both outputs
* if an internal fuse blasts
* at break-down of an internal supply voltage
* at an interruption of mains voltage
* at too high levels of very low frequencies or at DC offset at an output
* at too high levels of very high frequencies or oscillating at an output 


After end of a break-down both outputs will work again. 
 


Dimensions: W 435mm x H 145mm x D 395mm (inclusive rear heat sink)


Weight: 17,5 kg


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