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FRONT PANEL CONTROLS

 

LEVEL CONTROL  The 901 level control is assembled with an ultra precision 
24 position gold contact switch.  Using low inductance surface mount metal 
film resistors this switch is the ultimate attenuator for sonic fidelity and level 
accuracy.  Left-right channel balance is maintained to within 0.05dB at any 
setting.  The attenuation curve is shown in the table below. 

POSITION 

ATTENUATION 

POSITION 

ATTENUATION 

POSITION 

ATTENUATION 

24 

16 

-16 

-32 

23 

-2 

15 

-18 

-34 

22 

-4 

14 

-20 

-38 

21 

-6 

13 

-22 

-42 

20 

-8 

12 

-24 

-46 

19 

-10 

11 

-26 

-50 

18 

-12 

10 

-28 

-60 

17 

-14 

-30 

-

 

 

GAIN RANGE  The gain range switch provides an extra 10dB of gain for 
monitoring –10dB signals or use with low sensitivity headphones.  With the 
LEVEL CONTROL at maximum, the LOW gain position pr10dB overall 
gain when using the analog inputs.  When using the digital input, this setting 
will yield +20dBu out at 0dBFS.  When the GAIN RANGE switch is depressed 
the overall gain is +20dB 

LEVEL CONTROL

SAMPLE RATE 

INDICATOR

POWER SWITCH

GAIN RANGE

INPUT SELECT

OUTPUT JACK

Содержание Grace 901

Страница 1: ...el 901 HEADPHONE AMPLIFIER OWNERS MANUAL PO Box 204 Boulder CO 80306 tel 303 443 7454 fax 303 444 4634 email info gracedesign com web www gracedesign com Revision A November 2001 Copyright 2001 Lunatec LLC ...

Страница 2: ...find the latest owners manuals and other technical documents at http www gracedesign com documents docs html MODEL 901 FEATURES Balanced XLR analog inputs Unbalanced RCA analog inputs AES SPDIF and TOS LINK digital inputs High current output amplifier drives 8 Ohm loads 24 position level attenuator with 05dB channel matching Internal linear power supply High current low noise torroidal power trans...

Страница 3: ...NUATION POSITION ATTENUATION 24 0 16 16 8 32 23 2 15 18 7 34 22 4 14 20 6 38 21 6 13 22 5 42 20 8 12 24 4 46 19 10 11 26 3 50 18 12 10 28 2 60 17 14 9 30 1 GAIN RANGE The gain range switch provides an extra 10dB of gain for monitoring 10dB signals or use with low sensitivity headphones With the LEVEL CONTROL at maximum the LOW gain position provides 10dB overall gain when using the analog inputs W...

Страница 4: ...he sample rate is determined by a frequency comparator not by the sample rate bits in the digital data This ensures that the proper DAC filter settings are used even if there are erroneous sample rate bits in the signal Sample rates of 44 1 48 88 2 and 96kHz are directly indicated 32kHz is indicated when the 44 1 and 96 LEDs are both illuminated OUTPUT JACK The two output jacks are wired in parall...

Страница 5: ...odel 901 is capable of delivering over 5 Amperes of current to the headphone jack The nature of the TRS jack allows for the ring to be shorted to the sleeve when the plug is partially inserted If the plug is left partially inserted and there is a high amplitude signal on the output of the amplifier the line fuse will blow Always replace the line fuse with the proper type fuse or damage to the ampl...

Страница 6: ...de to 10dB Boost Mode to 20dB FREQUENCY RESPONSE 0dBu out 25dB 22Hz 120kHz 0dBu out 5dB 12Hz 260kHz 0dBu out 3dB 4Hz 600kHz MAXIMUM OUTPUT LEVEL 1kHz 50 Ohm load 23dBu 10 9Vrms 30 8V p p INPUT IMPEDANCE 40K Ohms balanced 20K Ohms unbalanced OUTPUT IMPEDANCE 5 Ohms DYNAMIC RANGE 0dB gain 50 Ohm load 116dB 10dB gain 50 Ohm load 121dB CMRR 3 5Vrms in 10dB gain 75dB DISTORTION THD N 10dB gain 10dBu ou...

Страница 7: ...6 NOISE FLOOR 0dB gain 22 22kHz 95dBu 0dB gain A weighted 102dBu POWER REQUIREMENTS 115VAC 16A 230VAC 08A ...

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