Aphex Systems Explore the Features of the Aphex 320D Stereo Receiver Manual

INPUT OUTPUT G.R.

DVG

-15

-12 -9

-6

-3

0 +3

+6

+9

+12 PGM(dB)

SILENCE GATE

2

4 6

8

10

12 14

16

18

20 GR(dB)

METER SELECT

DRIVE

PROCESS BALANCE

OUTPUT

THRESHOLD

UNLINK

LINK

STEREO

LEVELING

ENHANCE

OUT IN

S F

OUT IN

LEVELING &

COMPRESSION

PROCESS

RATE

LIMITER

-

0dB

LEVEL

COMPRESS

-10dB +10dB

-40dB 0dB

-15	-12	-9	-6	-3	0 +3	+6	+9	+12 PGM(dB)	SILENCE GATE	POWER
DVG 2	4	6	8	10	12 14	16	18	20 GR(dB)
DRIVE			PROCESS BALANCE					OUTPUT	THRESHOLD	COMPELLOR®
										MODEL 320D
										ANALOG & DIGITAL I/O
OUT IN			S F					OUT IN
PROCESS			RATE					LIMITER
-	0dB			LEVEL	COMPRESS		-10dB +10dB		-40dB 0dB

AC LINE 30 WATTS

COMPELLOR®

IN

DIGITAL AES3

OUT

INPUT

IN

ANALOG CH2

OUT

IN

ANALOG CH1

OUT

32-96kHz

AUDIO

MODEL 320D

SOURCE

OP

OP

SELECT

MADE

LEVEL

LEVEL

59887

-10 +4

-10 +4

IN

S Y S T E M S

COMMERCIAL

ANALOG

U.S.A.

AUDIO

PROTECTED BY ONE OR MORE OF

EQUIPMENT

DIGITAL

THE FOLLOWING PATENTS:

FUSE: 100-120V (3/8ASB)

200-240V (1/4ASB)

4155047 4578648 5422602

320D Compellor

Get the Best of Both Worlds

DUAL MONO or STEREO

The 320D converts between acting as two independent mono processors and one linked stereo processor by front panel selection. This is true with both analog and digital I/O.

ANALOG or DIGITAL IN, ANALOG and DIGITAL OUT!

The 320D serves as a fine A to D converter with processing. When you use the analog input, the digital output contains the Compellor’s processing and is there- fore ready for use in almost any application. Conversely, the 320D serves as a fine D to A converter. When you use the digital input, the analog output contains the Compellor’s processing, and is properly leveled and packaged.

ANALOG and DIGITAL AUDIO INTERFACES

The professional analog audio inputs and outputs are fully balanced and adapt to consumer or professional operating levels at the touch of a button. Analog or digital source selection is made at the rear panel.

For digital interfacing, the 320D contains a high quality 24-bit low noise codec to receive digital audio and to transmit digital audio. Once the incoming digital audio is converted by the DAC section, it passes through the Compellor as normal audio. The audio output is then converted back into digital by the ADC section of the codec.

The rear panel AES3 jacks are standard professional XLR 110 ohm interfaces. There is no word clock input or output. Synchronizing is accomplished from the AES3 input signal or an internal clock. When a digital input is present, the output is synchronized to the input sample rate. If no digital input is present, the digital out- put automatically locks to the internal default sample clock. The user can specify the default sample rate by changing the internal crystal. Spare crystals for 32kHz, 44.1kHz, 48kHz, and 96kHz are supplied with the unit free of charge.

The Model 320D codec translates the -20dBFS level of the digital audio source to the 0dB reference within the Compellor circuits. The average output levels will tar- get around -20dBFS. The selectable peak limiter’s threshold translates to -6dBFS. Thus, no digital audio output peaks will rise above -6dBFS when the limiter is on. The combination of averaging the level around -20dBFS and holding peaks below -6dBFS packages the audio perfectly for natural sound quality and for most trans- fer or transmission purposes. For example, the digital audio would be ready for direct input to an MP3 coder, HD recorder, broadcast digital STL, .wav file, etc.

ARCHITECT’S SPECIFICATIONS

A single rack space electronic audio level controlling device with both analog and AES3 digital audio I/O combining leveling, compression, and limiting for automati- cally and continuously correcting audio levels. The level controller shall be of such design as to reduce the audible artifacts of compression. It shall also be of such design as to prevent the rising of background noises when the audio source stops producing sound. The leveling function shall adapt discriminately to frequencies in a manner to reduce the impression of bass sounds losing impact in music. The compression function shall contain a means to adapt itself to the peak factor of sound so as to improve the consistency of volume levels. The limiter shall operate at a threshold 14dB above the 0VU reference level. Digital and analog audio out- puts shall be simultaneously available. The input shall be switchable between the analog and digital sources. The AES3 I/O shall operate normally at sample rates from 32kHz to 96kHz.

SPECIFICATIONS

5.1A ANALOG INPUTS
Connector:	3 pin XLR female
Type:	transformerless, servo balanced, RFI fIltered
Impedance:	22K-ohms balanced, 11K-ohms unbalanced
Operating Level:	user selectable +4dBu or -10dBV
Max input level:	+27dBu(ref = +8), +25dBu(ref = +4), +10.8dBV(ref = -10)
CMRR:	>90dB/100Hz, >70dB, 1KHz, >50dB, 20KHz
5.1B DIGITAL INPUT
Connector:	3 pin XLR female
Type:	transformer balamced
Impedance:	110 ohms
5.2A ANALOG OUTPUTS
Connector:	3 pin XLR male
Type:	electronic servo balanced (unbalanced without 6dB loss)
Impedance:	65 ohms bal or unbal (nominal load 600 ohms or greater)
Max level out (bal):	+25dBu(ref = +4), +10.8dBV(ref = -10)
Max level out (unbal):	+20dBu(ref = +4), +10.8dBV(ref = -10)
5.2B DIGITAL OUTPUTS
Connector:	3 pin XLR male
Type:	transformer balanced
Impedance:	110 ohms
5.3 AUDIO
Frequency response:	+/- 1dB 10Hz to 65KHz
Hum & noise:	measured for a 1KHz tone at unity gain
No gain reduction:	-67dBu(ref = +4), -86dBV(ref = -10)
10dB gain reduction:	-74dBu(ref = +4), -89dBV(ref = -10)
Crosstalk @ 20KHz:	-65dBu(ref = +4), -78dBV(ref = -10)
Dynamic THD	typically .05% for 1KHz at 20dB gain reduction
Static THD:	.025% at maximum output level
IMD, max output:	.13%(ref = +4), .4%(ref = -10)
5.4 SYSTEM FUNCTIONS
	Compression
	Frequency Discriminate Leveling
	Peak Limiter
	Dynamic Verification Gate (DVG)
	Dynamic Recovery Computer (DRC)
	Silence Gate
	Stereo Enhance
5.5 THRESHOLD
Compressor:	30dB below nominal level
Leveler:	30dB below nominal level
Limiter:	14dB above nominal level
5.6 RATIO
Compressor:	1.1:1 to 3:1 program dependent
Leveler:	20:1
Limiter:	>30:1
5.7 ATTACK TIMES
Compressor:	5 to 50mSec program dependent
Leveler, fast:	20Hz = 1.5 Sec > 1KHz Frequency Discriminate Leveler
Leveler, slow:	20Hz = 5 Sec > 1KHz Frequency Discriminate Leveler
Limiter:	1 uSec
5.8 RELEASE TIMES
Compressor:	200 mSec to 1 Sec program dependent
Leveler, fast:	3 Sec
Leveler, slow:	10 Sec
Limiter:	200 mSec
5.9 DIGITAL AUDIO
Input SR:	Locks to 44.1, 48, 88.2, 96kHz +/- 3%
I/O Type:	AES/EBU 110 ohms XLR
Default Output SR:	User definable by replacing crystal; 48kHz standard
Word Clock:	Not Supported
5.10 OTHER SPECIFICATIONS
AC input:	IEC standard receptacle with voltage selector, fuse, & filter
Power requirements:	100-120-220-240VAC, 50-60Hz
Power input (max):	20 watts
Dimensions:	19”W x 1.75” H x 10.125” overall depth
	depth behind front panel = 9.25”
Net weight:	8 lbs.
Shipping weight:	9 lbs.