Alesis AI1 User Manual

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3.3K ADAT to ADAT

In this configuration, the AI-1becomes a transparent link in a daisychain. In the figure below, ADAT #2 is transmitting all 8 tracks to ADAT #1, in addition to all 8 tracks of ADAT #1 being routed to ADAT #2. The sample rate is fixed at 48kHz, and cannot be changed to 44.1kHz. The proper control settings for this operation are as follows:

Source = ADAT

Destination = ADAT

Destination Rate = 48kHz

Figure 15

When bouncing tracks from ADAT #2 to ADAT #1, the first ADAT is the master and must provide sync information to ADAT #2. However, when the first ADAT is put into DIGITAL IN mode, it looks at the digital source for its clock information, instead of using its own internal clock. For this scenario to work, it is necessary that the first ADAT use its own internal clock. When the DIGITAL IN button is turned on, it can be set to one of two modes: either looking for sync information from the incoming digital audio (normal setting) or to ignore the incoming sync information and use its own internal clock. Therefore, when recording from ADAT #2 onto ADAT #1, you must switch the first ADAT’s DIGITAL IN mode to the “internal clock” setting so that it ignores the digital source’s clock and provides it own.

To set the master ADAT to use its internal clock while recording

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from another digital source:

1.Press and hold the SET LOCATE button;

2.Press the DIGITAL IN button;

The ADAT’s display will momentarily read “int” indicating it will use its own internal clock at all times, even when the DIGITAL IN button is enabled. When you wish to record from the AI-1again (from an AES/EBU or S/PDIF source), you must set the master ADAT back so it synchronizes to the incoming digital source’s clock. This is done by repeating the steps above (the ADAT’s display will momentarily read “diG” indicating it will use the incoming clock from the digital source).

3.3L AES/EBU to AES/EBU

In this configuration, the AES/EBU jacks are used to connect two AES/EBU devices through the AI-1.This scenario would only occur when you wished to use theAI-1to perform sample rate conversion between the source and destination devices. The proper control settings for this operation are as follows:

Source = AES/EBU Destination = AES/EBU

Destination Rate = 48kHz or 44.1kHz (opposite from the source’s sample rate)

Figure 16

3.3M S/PDIF to S/PDIF

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In this configuration, either the S/PDIF fiber optic jacks or RCA jacks (or both) are used to connect two S/PDIF devices through the AI-1.In the figure below, S/PDIF device #1 is connected to the RCA jacks of theAI-1,while S/PDIF device #2 is connected to the fiber optic jacks. This scenario would only occur when you wished to use theAI-1to perform sample rate conversion between the source and destination devices. The proper control settings for this operation are as follows:

Source = S/PDIF Destination = S/PDIF

Destination Rate = 48kHz or 44.1kHz (opposite from the source’s sample rate)

Figure 17

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CHAPTER 4: APPENDICES

4.0 APPENDIX 1: SPECIFICATIONS

Number of Digital Audio

 

Channels:

 

ADAT:

8

AES/EBU, S/PDIF:

2

Sample Clock Input range:

48 kHz nominal. User variable

 

from 50.8 to 40.4kHz (+1, -3

 

semitones).

Digital Inputs/Outputs:

 

Connectors:

Four EIAJ fiber optic jacks (2

 

inputs, 2 outputs); two RCA

 

connectors (1 input, 1 output); two

 

XLR connectors (1 input, 1 output)

Communications

 

Protocol:

Alesis Fiber optic Multichannel (8

 

tracks); AES/EBU (2 channels);

 

S/PDIF (2 channels)

Front Panel Controls and

 

Indicators:

Push buttons with LED indicators

 

for ADAT Channel (1/2, 3/4, 5/6,

 

& 7/8), Destination Rate (48kHz,

 

44.1kHz), Source and Destination

 

(ADAT, AES/EBU, S/PDIF); AC

 

power switch

Rear Panel Controls and

 

Connectors:

Two 9 pin D-Subconnectors for

 

Sync In and Sync Out; Four EIAJ

 

fiber optic jacks for ADAT Digital

 

In and Out and S/PDIF Digital In

 

and Out; Two RCA jacks for

 

S/PDIF In and Out; Two XLR

 

connectors for AES/EBU Digital

 

In and Out; One BNC connector

 

for 48kHz Word Clock Out; IEC-

 

spec AC cord connector.

Power Requirements:

90-250VAC,50–60Hz, 50 W max.

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Dimensions (H x W x D):

1-3/4"x 19" x6-1/4"

Weight:

4.5 lbs (2 kg)

Shipping Weight:

7 lbs (3.1 kg)

Accessories Included:

IEC style AC power cord

 

Owner’s Manual

Optional Accessories:

RMB Remote Meter Bridge

 

BRC Master Remote Control

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4.1 APPENDIX 2: MAINTENANCE/SERVICE INFORMATION

4.1A Cleaning

Disconnect the AC cord, then use a damp cloth to clean the AI-1’smetal and plastic surfaces.

4.1B Maintenance

Here are some tips for preventive maintenance:

Periodically check the AC cord for signs of fraying or damage.

Unplug the AI-1when not in use for extended periods of time.

4.1C Servicing

DO NOT ATTEMPT REPAIRS YOURSELF. THERE ARE NO USER SERVICEABLE PARTS INSIDE THE AI-1.Refer all servicing to Alesis. YOU MUST FIRST CONTACT ALESIS TO OBTAIN A RETURN AUTHORIZATION NUMBER BEFORE THE UNIT IS RETURNED TO ALESIS.

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