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Manual-1

DA 26S

DISTRIBUTION AMPLIFIER

Operators Manual

WEAR PARTS: is product contains no wear parts.

Quick Start

Are you in a hurry? For optimum system performance, we recommend reading the detailed Setup & Operation below and on page

Manual-4. For those who can’t wait, at least be aware of these points:

• ere are two inputs: PRIORITY and LINE. e PRIORITY Input accepts MIC or LINE level.

• e PRIORITY Input sums with an output when assigned by the PRIORITY ASSIGN Port, and PRIORITY DETECT is ac-

tive.

• e level of the PRIORITY Input is unaﬀected by the AGC, Output Level controls or Remote Level controls.

• e AGC only operates when the signal is within 26 dB of the Target Level. If the Line Input level is out of AGC range, the 0 dB

indicator on the AGC GAIN meter is oﬀ.

• With the RATIO set to ∞:1, the AGC GAIN meter should indicate about 0 dB for nominal Line Input levels.

• e AGC SLOW / FAST switch only aﬀects the gain reduction time constant. e gain increase time constant is ﬁxed.

• Only the LINE Input is processed by the AGC, CROSSOVER, Output Level and Remote level controls.

• e three Crossover Outputs (full-range, high-pass and low-pass) may be selected by any of the six Outputs.

• Set the initial Output levels using the Output Level controls on the front panel.

• Remote Level controls allow end user adjustment of Output level.

• Any combination of Remote Ports may be controlled by a single Remote device.

• Remote Level controls provide automatic loudness compensation for low-pass Outputs. Loudness compensation is not provided for

full range Outputs.

• e optional VR 1 Remote Level control provides audio taper control over a range of 0 dB to –80 dB.

Setup & Operation

e outline below is detailed in the following procedure.

1. Set Line Input level

2. Set AGC (Automatic Gain Control) Target Level and Ratio

3. Set Crossover frequency

4. Select Source for each Output (Full-range, High-pass or Low-pass)

5. Set Output Level controls

6. Connect Output Remote Level controls

7. Connect the Priority Input for the intended source

8. Set the Priority Input automatic Detect threshold

9. Set Ducking depth for the application

10. Priority Assign selection

1. Connect a balanced line level source to the Line Input. e

Line Input accepts an unbalanced Input connected to (+) and

(GND). We do not recommend unbalanced operation unless

the distance to the source is less than 3 feet [one meter].

2. e Line Input signal is processed by the AGC circuit. e

AGC GAIN meter 0 dB indicator lights when the Line Input

signal is within 26 dB of the set TARGET LEVEL. For Line

Input levels more than 26 dB below the Target Level, the 0 dB

indicator is oﬀ and AGC returns to unity. e AGC GAIN

indicates the amount of attenuation used to make the Line

Input level equal the set TARGET LEVEL. For best results,

the AGC GAIN meter should indicate about 0 dB for nomi-

nal Line Input signals. e best resolution for this adjustment is

achieved with the AGC RATIO set to ∞:1.

e TARGET LEVEL is set in one of two ways:

a) If you have a source output level control, set the TARGET

LEVEL to the desired setting and adjust the Line Input

level so that the AGC GAIN meter indicates 0 dB for

nominal signal levels.

b) If a source output level control is not available, adjust the

TARGET LEVEL so the AGC GAIN meter indicates 0 dB

for nominal Line Input levels. e diﬀerence between the

resulting AGC Target Level and the desired Target Level is

compensated with the OUTPUT trims. With Input level

and TARGET LEVEL correctly set, adjust the AGC RA-

TIO to the desired value. We recommended values between

2:1 and ∞:1 as marked by the gray band. e soft-knee-

response of the AGC results in a natural sounding response

with AGC Ratios as high as ∞:1.

3. e CROSSOVER splits the Line Input signal into three

separate Outputs: Full-Range, High-pass and Low-pass, each

selectable for each of the six Outputs. Select the desired FRE-

QUENCY (80, 110,150 or 200 Hz).

continued on page Manual-4...

dBu dB

+4ON

MIN MAX

-12-80 0 +12 1:1

dBu

-12

+12

-12

+12

-12

+12

-12

+12

-12

+12

-12

+12

-12 -6 -3 03612

DA 26S

DISTRIBUTION

PROCESSOR

DETECT

PRIORITY

GAIN DUCKER

AGC

CROSSOVER OUTPUTS

POWER

OL SLOWACTIVE

LEVEL RATIO

FAST

GAIN

TARGET

HIGHFULL

LOW

HIGHFULL

LOW

HIGHFULL

LOW

HIGHFULL

LOW

HIGHFULL

LOW

HIGHFULL

LOW

FREQUENCY

150

11080

200

Summary of content (4 pages)

PAGE 1
Operators Manual DA 26S DISTRIBUTION AMPLIFIER PRIORITY DETECT GAIN MIN MAX OL ON +4 dBu ACTIVE AGC DUCKER TARGET LEVEL -80 -12 dB 0 +12 dBu CROSSOVER RATIO 1:1 OUTPUTS 1 FREQUENCY GAIN :1 SLOW FAST -12 -6 -3 0 -12 3 6 12 80 110 150 200 2 +12 FULL HIGH LOW -12 3 +12 FULL HIGH LOW -12 4 +12 FULL HIGH LOW -12 5 +12 FULL HIGH LOW -12 6 +12 FULL HIGH LOW -12 DA 26S DISTRIBUTION PROCESSOR +12 FULL HIGH LOW POWER Quick Start Are you in a hurry? For optimum system
PAGE 2
Front Panel Description PRIORITY DETECT GAIN MIN MAX OL ON +4 dBu ACTIVE AGC DUCKER TARGET LEVEL -80 -12 dB 0 +12 dBu CROSSOVER RATIO 1:1 OUTPUTS 1 FREQUENCY GAIN :1 SLOW FAST -12 -6 -3 0 -12 3 6 12 80 110 150 200 2 +12 FULL HIGH LOW -12 3 +12 FULL HIGH LOW -12 4 +12 FULL HIGH LOW -12 5 +12 FULL HIGH LOW -12 6 +12 FULL HIGH LOW -12 DA 26S DISTRIBUTION PROCESSOR +12 FULL HIGH LOW POWER 1 PRIORITY GAIN trim and OL indicator: adjusts the gain for the PRIORITY IN
PAGE 3
Rear Panel Description DA 26S 100-240 V 50/60 Hz 7 WATTS THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES FOR A CLASS 'B' COMPUTING DEVICE.
PAGE 4
Setup & Operation…continued from page Manual-1... 4. Next, set up the six OUTPUTS. First, determine the number of zones served and the signals to be sent to each. Using a drawing like the example application diagram in the Data Sheet is helpful. For ease of wiring, make Outputs serving a common zone adjacent. Select Full-range, High-pass or Lowpass as required for each output. The following are possible zone configurations: • Full-range only for medium size bookshelf speakers.