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AMC AV81HTc-DD - Solid State Preamp, Dolby Digital Preamp/Processor, 2 Digital & 8 Analog Source Inputs, A/V Switching, Remote Control


  • The AMC model AV81HTc-DD was designed to meet professional quality standards for Dolby Pro-Logic, Dolby Digital decoding and video switching.

  • Dolby Pro-Logic and Dolby Digital decoding are accomplished by the Zoran ZR38500 Digital Signal Processor. This device is acclaimed worldwide as having the finest sonic quality of any currently available device for decoding Dolby Pro-Logic and Dolby Digital motion picture sound tracks.

  • With the microphone supplied, a simple calibration procedure can be made that sets the balance of all six channels to an accuracy of less than +/-1dB.

  • Two Digital Inputs, eight Stereo Audio Inputs and four Composite Video Inputs.

  • Six Audio Outputs and one Video Output.

  • Six Output Level preset controls precisely set the balance of each of the six output channels.

  • Switchable sub-woofer crossover filter.

  • Center channel mode control that provides Normal, Phantom and Wide Band center channel operation.

  • Center channel Time Alignment control that provides 0,1,2,3,4 and 5 ms delay of the center channel signal relative to Left and Right Channels.

  • Operating modes include: Stereo, Dolby Pro-Logic, PCM, Dolby Digital and Dynamic Range Compression.

  • Remote Operation of Volume, Source Selection, Modes, Noise Sequence and Power ON/OFF.

  • Control of surround channel delays of 15,20,25 and 30 ms.

  • Built-in calibration meter.


Audio Inputs (CD, Tuner, Tape 1, Tape 2, VCR1, VCR2, LD&Video) and Outputs (Stereo Mode)

Input impedance

R=47K ohm, C=l00 pF

THD 20 Hz-20 KHz and SMPTE IMD

<0.01% at 3Vrms

Inputs Sensitivity for 1V output


Input Overload


Signal to Noise Ratio (Gain=1)

95dB "A" wtd ref. 1V

Frequency Response

20 Hz to 20 KHz +/- 0.5 dB

Output Impedance

75 ohm

Maximum output level

12 Vrms

Subwoofer cross-over frequency


Tone control







Video Inputs (VCR1, VCR2, LD & Video) and Outputs

Input Impedance

75 ohm

Input Level of Peak White

1V peak

Output Impedance

75 ohm

Gain (From Video Inputs to Output)

Unity with 75 ohm term

Frequency Response



+/- 1 dB



+/- 6dB

Maximum Input Level

+/- 2V peak

Dolby Digital Mode

Output level @ 1 KHz/0 dBFS

Variable, max. 9V at clipping

THD+N @ 0 dBFS/2V output


Main channels

0.006% at 1KHz


Surround channels

0.006% at 1KHz


Center channel

0.006% at 1KHz



0.006% at 30Hz

Channel separation at 1 KHz/2V output


Signal to noise ratio @ -20 dBFS



Dimensions (WxHxD)

430x82x300 mm

Net weight

5.0Kgs. (11 lbs.)

Power consumption


Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic" and the double-D symbol are trademarks of Dolby Laboratories. Confidential Unpublished Works. (C) 1992-1997 Dolby Laboratories, Inc. All rights reserved.

Weltronics Corp. reserved the right to improve its products at any time. Therefore, specifications are subject to change without any notice.



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