ATI Audio DA206 Operating And Maintenance Manual - Page 2

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ATI Audio DA206 Operating And Maintenance Manual

DESCRIPTION

The DA206 and DA412 provide two or four 1x3 distribution amplifier channels with

balanced inputs and +24dBm outputs. A master gain adjustment for each channel

controls all three outputs together to adjust for varying inputs while individual trimmers for

each output allow adjustment over a 20dB range to accommodate -10dbu semi-pro up to

+8dBm line levels.

Another of the DA206 and DA412 Distribution Amplifiers many claims to fame is the use

of XLR type input and output connectors. XLRs are easy to use but make paralleling

inputs for 1x6 or 1x12 operation difficult. However, if you look under the hood (remove the

top cover) you will find some convenient jumper plugs that allow you to parallel inputs A

and B (P4 & P5), B and C (P6 & P7), C and D (P10 & P11), individually or simultaneously.

If you are making a stereo 1x6 DA, drive inputs A and C with Left and Right signals and

jumper inputs A to B and C to D. You can use the empty input connectors to loop-thru to

the other dozen ATI distribution amps that we hope you are using.

The DA208/416 has a quiet input stage with excellent common mode hum rejection. An

internal gain selection jumper plug for each input (P2, P3, P8, P9) optimizes for nominal

inputs at -20dBu, -10dBu or +4dBu. Inputs up to +24dBu will not clip in the +4dBu position

and input signals exceeding +24dBu will clip cleanly with no hang-up or phase reversal.

A quad bi-fet opamp forms the three variable gain output adjusts stages. The variable

gain stages utilize a unique circuit arrangement that allows us to provide a smooth,

logarithmic gain control for each output using an inexpensive (but good) linear cermet

potentiometer. Since we actually reduce the stage gain for low outputs rather than taking

the more conventional approach of reducing the input level to a fixed gain amplifier, we

can use the DA at low output levels with very little noise penalty. You can use the DA to

match console medium level inputs (-20dBu) or to drive semi-pro IHF inputs without

requiring outboard attenuator pads.

Active balanced output drivers sense the voltage on their high and low output lines and

will shut off drive to a grounded output line while doubling the drive on the other. This

capability allows you to connect the outputs to balanced or unbalanced loads without

regard to whether or which side of the output is grounded. Maximum output at clipping is

+24dBm into balanced loads, however, even though the gain is the same under either

condition, clipping output is reduced by 6dB when driving an unbalanced load since the

full output swing capability of only one driver of the two is available.

Your Encore DA operates from a bipolar 15VDC regulated supply. The power supply is

designed for minimum susceptibility to power line transients and conducted RFI using

ferrite beads, double bypassing and a non-concentric wound semi-toroidal transformer.

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