Rane RC 24A Manual

Rane Blander RC 24A

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Side 1/4

OPERATING / SERVICE MANUAL RC 24A

PAQRAT RECORDING CONVERTER

DESCRIPTION

The RC 24A (or “PAQRAT”) allows you to record and play back stereo digital audio signals with up to 24 bits of

resolution using your Alesis ADAT modular digital multitrack.

The RC 24A accomplishes this task by converting the AES/EBU (or SPDIF) stereo 24-bit digital audio source signal to

four 16-bit channels compatible with Alesis’s proprietary “ADAT Optical” interface. The RC 24A simultaneously writes

these signals onto the ADAT and reads them back off again. Controls on the front panel allow you to assign these four

channels to tracks 1-4, 5-8, or 1-8 (two identical groups of four tracks) on the ADAT. The odd tracks carry the upper 16

bits of the original digital audio signal, and the even tracks carry the lower eight bits plus a -20dB reference tone.

Note: Although it is nearly impossible to achieve better than 20-bit performance from today’s A/D converters, we refer

to the high resolution inputs and outputs to/from the PAQRAT as 24-bit anyway, just to simplify things. You can interface

any AES/EBU or SPDIF signal to the input and output of the PAQRAT from 16 to 24 bits.

SETUP & OPERATION

1. Connect one of the supplied fiber optic cables between the digital output connector on your ADAT and the DIGITAL

INPUT connector on the RC-24A.

2. Connect one of the supplied fiber optic cables between the digital input connector on your ADAT and the DIGITAL

OUTPUT connector on the RC-24A.

3. Connect a stereo digital audio source signal (up to 24-bit) to the AES/EBU (or SPDIF) INPUT on the rear of the RC-24A.

Set the INPUT SELECT switch to AES/EBU or SPDIF for the appropriate input.

4. Connect the AES/EBU OUTPUT on the rear of the RC-24A to whatever is receiving the 24-bit digital audio signal during

playback (and monitoring).

5. Connect the supplied Rane RS-1 remote power supply to the red POWER jack on the rear of RC-24A.

6. Make sure the ADAT is plugged in and turned on.

7. Press the DIGITAL IN button on the ADAT to select the ADAT OPTICAL interface as the audio signal source.

8. Press the RECORD TRACK ASSIGN and PLAYBACK TRACK ASSSIGN buttons on the RC-24A to select tracks 1-4, 5-8,

or 1-8 (record only). Arm the corresponding tracks on the ADAT for recording.

9. Record and play back tracks on the ADAT as normal, using the AES/EBU (or SPDIF) Input and Output on the RC-24A as

the source and destination for the 24-bit digital audio signal.

FRONT PANEL DESCRIPTION

1. POWER LED. When dim, this LED indicates that you forgot to plug in the RC-24A.

2. SYNC LED. Indicates that a suitable AES/EBU (or SPDIF) sync source is plugged in. If this LED is not lit, the RC-24A is

not receiving signal from a source. Check the INPUT SELECT switch to make sure the proper input is selected.

3. TRANSPORT PRESENT LED . When lit, this LED indicates that an ADAT is connected to the RC-24A via the fiber optic

interface.

4. RECORD TRACK ASSIGN BUTTON . This push button switch lets you select which four tracks of the ADAT are

recorded with the stereo 24-bit digital audio source signal. An LED indicates whether you are recording onto tracks 1-4 or

5-8.

5. RECORD TRACK ASSIGN “BOTH” BUTTON . This push button selects all 8 tracks for recording, no matter what the

state of the RECORD TRACK ASSIGN BUTTON (previous section) is. Tracks 1-4 are identical to tracks 5-8. Use this

option when you are archiving a stereo master, and wish to create a redundant copy on the same tape.

6. PLAYBACK TRACK ASSIGN BUTTON . This push button switch lets you select which four tracks of the ADAT are

converted back to 24-bit digital audio, and transmitted out the AES/EBU OUTPUT. An LED indicates whether you are

playing tracks 1-4 or 5-8.

7. SAMPLE RATE LEDS . These LEDs indicate the sample rate of the AES/EBU (or SPDIF) source (sync) input (44.1kHz or

48kHz).

8. SOURCE WORD LENGTH LEDS . These LEDs indicate the word length (in bits) of the AES/EBU (or SPDIF) source

(sync) input.

9. 16-BIT DITHERED OUTPUT ENGAGE SWITCH. This switch engages 16-bit dithering and truncation on the AES/

EBU OUTPUT. Dither should be engaged when the AES/EBU OUTPUT is feeding a device that truncates the signal to 16

bits (e.g. DAT recorder, digital signal processors, and so on).

Produkt Specifikationer

Mærke:	Rane
Kategori:	Blander
Model:	RC 24A

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