present Bank. It may also be necessary to do a wake-up upon any power-up of the 1788A- R.

During wake-up, the Comm indicators will show activity with units that respond to handshaking. After handshake and during test, Status LED’s will temporarily appear yellow for all units present and responding. All units that are properly communicating will develop green Status LED’s. Selections with no corresponding units present will display blank (dark) Status LED’s.

The wake-up cycle time is about 1 to 8 seconds depending on how many units are on line. It can be initiated at any time without disrupting the network or causing the preamp units to malfunction.

3.2.3 Status LED’s

This row of tri-color led’s (red, yellow, green) indicates the status of the R/C link to 1788A’s

Table 3-1. Status LED’s

Color

 

Action

 

 

 

 

 

Wake-up

 

Preset Load

 

 

 

 

Green

OK

 

Loaded, OK

 

 

 

 

Yellow

Transacting

 

Mismatch*

Red

Unit Found But

 

Unit Missing

 

Improper Response

 

Dark

No Unit Found

 

No Unit Present

 

 

 

No Unit Expected

 

 

 

 

*Explained under 3.2.8

under varying conditions as shown in the following table.

3.2.4 Comm LED’s

These single-color red LED’s show when commands are being sent to each of the sixteen units. They do not show unit responses.

3.2.5 Clip/Limit LED’s

These single-color red LED’s flash whenever any one or more of the 1788A’s clip or limiter lights flash. The light is held for a long enough time to hopefully gather the attention of the operator. The holdover time can be adjusted by a hidden (secondary) function of the 1788A-R.

Changing the Holdover Time

To change the holdover time, press Both

Table 3-2. Clip/Limit LED Holdover Codes

Tone Buttons and the Ch 6 button then

 

 

Code

Function

release. This will attach the Adjust dial to

CL01

Hold 1 Second*

the holdover setup. The preset display

CL02

Hold 2 Seconds*

window will now show CLXX, where

CL03

Hold 4 Seconds*

XX will be from 01 to 05. These codes

CL04

Hold 8 Seconds*

CL05

Hold until cleared by pressing

represent various Clip/Limit holdover

 

any Unit Select button.

options according to the following table.

 

*If occurs on unselected unit, light holds until selected.

You can change this number by rotating

 

 

the Adjust dial. To escape from this control, press CH 6 again.

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Aphex Systems 1788a instruction manual Status LED’s, Comm LED’s, Clip/Limit LED’s, Changing the Holdover Time
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1788a specifications

Aphex Systems 1788A is a high-performance microphone preamp and A/D converter known for its exceptional sound quality and versatility. This device is widely used in professional recording studios, broadcast facilities, and live sound applications, catering to a range of audio needs from vocals to instruments.

One of the key features of the 1788A is its ability to handle a wide variety of microphone types, including dynamic, condenser, and ribbon microphones. It provides a significant amount of gain, with a range of up to 70dB, allowing it to capture even the faintest of sounds without introducing noise. The flexibility of input options is enhanced by phantom power, which can be activated for condenser mics needing external power.

The Aphex 1788A also integrates advanced A/D conversion technology, providing high-resolution 24-bit audio with sample rates up to 192 kHz. This ensures that audio fidelity is maintained during the recording process. The unit features a dual-path A/D converter, which optimizes the signal for clarity and precision.

The device also incorporates Aphex’s innovative iEqualization processing, allowing users to enhance their recordings with EQ capabilities in real time. The iEqualization feature is particularly beneficial for adjusting the tonal characteristics of the source material, providing a more polished final product.

Another standout characteristic of the Aphex 1788A is its robust build quality. Designed for the rigors of professional use, the unit is housed in a rugged chassis that can withstand the demands of mobile and studio environments alike.

Transporting this device is made easier due to its rack-mountable design, fitting seamlessly into any standard 19-inch rack setup. Additionally, users appreciate the intuitive front-panel controls that facilitate easy adjustments and monitoring of levels.

In terms of connectivity, the 1788A offers multiple outputs, including analog XLR and digital outputs via AES/EBU and S/PDIF connections, making it highly compatible with various audio interfaces and recording systems.

Overall, the Aphex Systems 1788A is a powerful tool that combines exceptional preamp performance with high-quality A/D conversion, making it an ideal choice for audio professionals seeking reliability and superior sound quality in their recordings. Its comprehensive feature set ensures it meets the demands of both studio and live environments, solidifying its reputation as a trusted piece of audio equipment.
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