Rane DA 26 (2003 version) User Manual

Page 6

Manual-4

104699

4. Next, set up the six OUTPUTS. First, determine the num-

ber 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 Low-

pass as required for each output. The following are possible

zone conﬁgurations:

• Full-range only for medium size bookshelf speakers.

• High-pass only for small distributed ceiling speakers.

• Full-range output combined with Low-pass Output to en-

hance bass response.

• High-pass output combined with Low-pass Output for true

bi-amp operation.

5. The ±12 dB OUTPUT trims set Output levels, with relative

levels between Full-range, High-pass and Low-pass. Note: the

Output trims do not aﬀect Low-pass loudness compensation or

Priority Input level. The idea is to set system levels for proper

operation at the maximum required SPL (with Remote Level

controls set for unity gain). Remote Level controls then at-

tenuate the level as required.

Automatic loudness compensation

is achieved by alter-

ing the gain control law of any Remote port associated with

a Low-pass Output. A Low-pass Output is always used in

conjunction with a high-pass or full-range Output. Because

the Remote Level control turns the low-pass Output down

at a lesser rate than the high-pass or full-range Output, bass

response is enhanced. The corner frequency for loudness com-

pensation is set by the CROSSOVER frequency selection. The

reference level for the room is set with the OUTPUT trim

on the front panel. Any Remote Level gain change results in

automatic loudness compensation.

6. A port for a wired Remote Level control is provided for each

Output. Note: Remote Level controls do not aﬀect the level of the

Priority Input. Each port provides a 5 volt reference voltage

(REF), a control voltage input (Vc) and a ground reference.

The gain control law for Vc is 50 mV/dB. Using the optional

VR 1 Remote control provides an audio taper response from

0 dB to > -80 dB. To control more than one Remote Port with

a single Remote control, it is only necessary to connect the Vc pin

of each additional port. An external ground referenced control

voltage with a range of 0 to 5 volts may be used with the

Remote ports. If the ratiometric output of a linear potentiom-

eter is used, (GND to CW, Vc to center tap, REF to CCW),

a linear log response results. Audio taper response requires a

potentiometer with a reverse log taper. Audio taper response is

achievable using a linear potentiometer by connecting a resis-

tor equal to 1/10th the value of the potentiometer between

GND and Vc as shown below:

Variations in wire type do not greatly aﬀect the performance

of the Remote controls. However, 22-gauge stranded wire

with a ﬂexible jacket is recommended. You may use 3-con-

ductor unshielded remote control signal cable for shorter

runs (less than 100 feet [30 meters]). For longer runs, we

recommend using shielded cable. The type of wire required

is inﬂuenced by your installation and local electrical codes.

Rane Corporation does not provide cable— please contact

your local retail or wholesale outlet.

7. The balanced PRIORITY INPUT operates at line or mic level,

determined by the MIC / LINE switch, on the rear panel

next to the PRIORITY INPUT jack. See Rear Panel (1) for

unbalanced connection rules. Note: the Priority Input is not

inﬂuenced by the AGC, Crossover, Output trims or Remote Level

controls. The gain range for MIC level Input is 30 to 60 dB.

The gain range for LINE level Input is 0 to 30 dB. Set the

PRIORITY GAIN to prevent overloading the Input — if the

Priority Gain OL illuminates, turn down the GAIN.

8. The PRIORITY DETECT threshold is calibrated in dBu,

and monitors the signal after the input preamp. Any change

in PRIORITY GAIN setting aﬀects the DETECT sensitiv-

ity. Set the GAIN, then set DETECT. The range of operation

is +4 dBu to ON. The consequence of setting DETECT too

low is premature triggering due to background noise. Setting

DETECT too high results in excess delay and a sudden large

step in amplitude (perceived as a “pop”). If a paging mic is

used in an environment with a lot of background noise, we

recommend a push-to-talk device.

The release time is ﬁxed at about 6 seconds. The release delay

is based on the typical time required to accommodate a pause

in speech or dead-time between music programs.

9. The PRIORITY DUCKER depth sets the amount of at-

tenuation applied to the LINE INPUT signal when the

PRIORITY INPUT is activated by the DETECT threshold.

DUCKER depth is continuously adjustable over a range of 0

dB to -80 dB. For equal mixing of PRIORITY and LINE, set

the DUCKER to 0 dB. For PRIORITY replaces LINE opera-

tion, use –80 dB. A value of –12 dB (2 o’clock) is typical for

PRIORITY (page) talks over LINE (music) operation.

10. The state of the PRIORITY ASSIGN port determines Prior-

ity Input assignment to each of the six Outputs. Assignment

pins are active low with passive internal pull-up. Any combi-

nation of pins may be active at one time. The select ALL pin

is provided for convenience. To complete an assignment, the

Output must be selected by the PRIORITY ASSIGN port

and Priority Detect must be active. Note that if a combination

of Crossover Outputs is used in one zone, all Outputs serving the

zone must be selected by the PRIORITY ASSIGN port. The type

of wire recommended is similar to the description in Step 6

above.

Setup & Operation…continued from page Manual-1...

GND
Vc
REF

10k