Spectral dmc 20

SPECIFICATIONS

DMC-20 Reference Preamplifier
Front Panel Controls

• Input Selector switch
• Balance Control
• Output Attenuation Control
• Mute switch
• Absolute Phase switch
• Tape Monitor switch
• Protection Circuit LED indicator
• Power LED indicator

Internal Controls

• Input Trim 20 dB range for tuner, disc, aux 1, aux 2, tape
• Input Trim Bypass Switches
• Phono Input Impedance selector (opt.)
• Protection System bypass switch
• Balanced Input Level 20 dB range
• Tape output level
• Balanced High Level operation switch

Rear Panel Connectors

• Signal Ground post (gold)
• 5 RCA Input connector sets (gold)
• Balanced Input Neutrik XLR connectors for aux 3 (gold)
• Tape input and output RCA connector set (gold)
• Balanced output RCA connectors for non-inverting, inverting
• Balanced output Neutrik XLR connectors (gold)
• DC Power Hi-Rel input connector

DMC-20 Preamplifier Technical Data
Input Compliment:

• 7 Inputs – tuner, disc, aux 1, aux 2, aux 3, (balanced, phono)

optionalOutput Compliment:

• 4 ouputs – normal, inverted, balanced, tape

Control Compliment
Output Attenuation:

• 32 step conductive plastic, modified log taper

Output Balance:

• 15 step attenuator switch with center position bypass

Mute Switch:

• 0 – 20 dB attenuation

High Level Trim:

• 0 to 10 dB attenuation for each channel all high level inputs, with attenuation bypass switches.

Mode Switches:

• Stereo/mono, absolute phase

Input Selections:

• 6 plus tape monitor

Recording Amplifiers
Input Impedance:

• 11K ohms, 100 ohm min. load

Output Impedance:

• 2K ohms

Protection Circuit
Protection Mode:

• DC Offset, oscillation

Method:

• Crowbar output relays

Sensitivity:

• 20 mV continuous DC

Recovery:

• Approx. 10 seconds

Chassis Temperature:

• Internal 48° C @ 25° room temp.

DMS-20 Power Supply Technical Data
Output Voltages:

• 1) Dual ± 40 VDC @ 0.6A

• 2) Dual ± 40 VDC @ 0.6A

• 3) Single ± 5 VDC @ 1A

• 4) Single ± 10 VDC @ 1A

Noise and Ripple:

• Less than 200 mV peak to peak

Reserve Capacity:

• 180 Joules per supply (±40 VAC)

Input Mains Voltage:

• 100VAC, 120 VAC, 220 VAC ±10% @ 47.5 Hz to 440 Hz (factory set)

Power Consumption:

• 80 watts normal, 175 watts max.

Protection: