Peavey CAB 8o, CAB 80 User Manual

Description

The CABª8i and CABª8o, respectively, are eight-input and eightoutput MediaMatrix

gateways onto and off of an Ethernet network for real-time MediaMatrix

audio distribution and control. They employ Cobranet proprietary protocol to ensure seamless, error-free transmission of high-quality real-time audio without drop-outs or lossy compression across a 100baseT Ethernet network.

The CAB

8i uploads eight channels of either microphone-level or line-level analog audio signals onto an Ethernet network. Each input channel has software controlled, continuously variable analog input gain from -9 dB to +60 dB in 1 dB steps. Each has 48-volt phantom power and a 20 dB mic/line pad. Both functions are software switchable.

The CAB 8o downloads eight channels of line-level analog audio signals from an Ethernet network. Maximum output levels are individually jumper-selectable between +24 dBu, +18 dBu, +12 dBu, and +6 dBu.

In addition to eight input or output audio paths, both products incorporate eight voltage-control input ports, eight software controlled TTL outputs port, eight software controlled relays with both normally open and normally closed contacts, an RS-485 port with multi-drop connections, and two word-clock linking BNC connectors.

Features

¥ Eight channels of either microphone

or line-level audio transmitted onto an Ethernet network using CobraNet

protocol sampled at 48 kHz (CAB 8i).

¥ Eight channels of line-level audio

transmitted from an Ethernet network using CobraNet protocol sampled at 48 kHz (CAB 8o).

¥ A/D converters are 24-bit, 64 times

oversampling, using delta-sigma modulation (CAB 8i).

¥ D/A converters are 24-bit, 128 times

oversampling, using delta-sigma modulation (CAB 8o).

¥ 48-volt phantom power for microphone

inputs, individually software switchable on each input channel (CAB 8i).

¥ 24- or 20-bit transmission quantization

at a 48 kHz sampling rate.

¥ Eight channels of analog control voltage

input ports which allow external switches, potentiometers, or voltage sources to control MediaMatrix software parameters via an Ethernet link.

¥ Eight channels of TTL control outputs

ports which are software controllable via an Ethernet link.

¥ Eight relays, with both normally open

and normally closed contacts, which allow software control of external devices via an Ethernet link.

¥ A non-Ethernet RS-485 control port with

two mulit-drop connections.

¥ Two word clock linking connectors that

enable auto-switch-over to a second unit, should one unit fail.

¥ One rack-unit (1-3/4"), fan-cooled

chassis.

Applications

¥ Stadiums ¥ Cruise ships ¥ Multi-purpose facilities ¥ Auditoriums ¥ Large-scale paging systems ¥ Schools ¥ Courts of law ¥ University campus buildings ¥ Theme parks ¥ Performing arts centers ¥ Distance learning ¥ Hotel meeting rooms ¥ Houses of worship ¥ Conference centers ¥ Teleconferencing ¥ Live sound microphone snakes ¥ Civic centers ¥ Music clubs ¥ Theaters ¥ Arenas ¥ Any facility requiring distribution of

multiple microphone or line-level signals

SPECIFICATIONS

MediaMatrix

CAB™ 8i and

CAB™ 8o

AUDIO SPECIFICATIONS

Audio Channels:

CAB 8i: Eight input channels, line-level

or microphone level with switchable 48-volt phantom power. CAB 8o: Eight output channels, linelevel with individual channel jumpers for a maximum output of +6, +12, +18, or +24 dBu (factory default is +12 dBu for unity I/O gain). Note: See Digital specifications, Audio Channels per CAB 8i/8o for number of channels limitations.

Frequency Response:

20 Hz Ð 20 kHz, +0/-0.5 dB, with a +4 dBu input signal, unity gain in and out.*

Total Harmonic Distortion:

0.01% @ 1 kHz, 0.02% @ 20 kHz, with a +4 dBu input signal, unity gain in and out* Note: Measurements made using a 10 Hz to 30 kHz input filter on Audio Precision System One for testing.

Dynamic Range:

Mic Level:

Ð123 dBu equivalent input noise with a 150 Ohm, Ð48 dBu input signal, no input pad, analog input gain at 60 dB, digital gain at 0 dB, analog output set for +12 dBu maximum (factory pre-set jumper for unity gain through-put) Note: This is equivalent to 78 dBA, 75 dB unweighted.

Line level:

95 dBA, 93 dB unweighted, with a +12 dBu input signal, unity gain in and out*

Input CMRR (CAB 8i):

Better Than 65 dB at Any Gain Setting:

73 dB with +12 dBu input and unity gain in and out*, 69 dB with a +4 dBu input signal and unity gain in and out*, 68 dB with a Ð56 dBu input signal, no input pad, analog input gain at 60 dB, digital gain at 0 dB, analog output set for +12 dBu maximum (factory pre-set jumper for unity gain through-put).

Maximum Input Level (CAB 8i):

+29 dBu, with a 20 dB pad in and the analog input gain at 0 dB, +38 dBu with a 20 dB pad in and the analog input gain at Ð9 dB. Note: The analog input gain control is not buffered with an electronically balanced amplifier and maintains a balanced input circuit with 1-dB-per-step precision and specified CMRR.

Maximum Output Level (CAB 8o):

+24 dBu @ 600 ohms

CAB 8i Gain:

Software controlled analog gain from Ð9d B to +60 dB, adjustable in 1 dB increments, with a software selectable analog Mic/Line input switch. (Line level selection inserts a 20 dB input pad.)

CAB 8o Gain:

Software controlled analog output gain from Ð95.5 dB to +31.5 dB, adjustable in 0.5 dB increments with internal analog output jumpers for maximum output levels of +6, +12, +18, or +24 dBu Note: It is not recommended to use this as a microphone level output as noise will be a problem at extremely low output levels.

Input Impedance (CAB 8i):

22.2 k ohms for Line input selection and

2.2 k ohms for Mic input selection

Output Impedance (CAB 8o):

100 Ohms, designed to drive a minimum load of 600 Ohms

Analog LED Metering:

Eight peak-reading headroom meters, calibrated in dBu, monitor the analog level present at the input to the A/D converters for the CAB 8i, and at the output of the D/A converters for the CAB 8o, with the top-most red LED indicating A/D or D/A clipping. Note: The top-most red LED should never illuminate during normal operation.

Note 1: Audio specifications are measured from the input into the CAB 8i and the output out of the CAB 8o where relevant.

Note 2: All specifications are typical. *Indicates no input pad, analog input gain

at 0 dB, digital gain at 0 dB, analog output set for +12 dBu maximum (factory pre-set jumper for unity gain through-put).

DIGITAL SPECIFICATIONS

A/D and D/A quantization:

24-bit resolution

Audio Transmission Quantization via CobraNetª:

Software switchable, 24 or 20-bit resolution

Digital Processing:

24-bit DSPÕs, 56-bit accumulators

Audio Sampling Rate and Clock Speeds:

48 kHz audio sampling, 80 MHz DSPÕs,

12.288 MHz master clock

Audio Channels Per CAB 8i/8o:

¥ Eight with 20-bit transmission quanti-

zation selected

¥ Seven with 24-bit transmission quanti-

zation selected

CONTROL SPECIFICATIONS

CobraNetªI/O:

100BaseT Ethernet via a standard eight-conductor RJ-45 jack

RS-485:

One port with two 3-cond. half duplex, multi-drop connections

Control Ports:

Control voltage in:

0 VDC to +10 VDC, externalpotentiometer or external-voltage-source controlled (internal 10 VDC supply provided)

Software controlled TTL (Transistorto-Transistor Logic) out:

0 VDC or +5 VDC, with a maximum current of 28 mA distributed to 8 outputs

Eight Software Controlled Relays With Both NO and NC Contact:

Maximum contact voltage:

120 VAC or DC

Maximum contact current:

2 A

Word-Clock Ports:

Two BNC I/O ports Note: Can be used for redundancy back-up that automaticaly switches from one CAB 8 to another if the first should fail.

GENERAL SPECIFICATIONS

Dimensions:

CAB 8i CAB 8o:

1.730" H x 19" W x 11.698" D (4.39 cm H x 48.26 cm W x 29.71 cm D)

Net Weight:

CAB 8i: 8.5 lbs. (3.86 kg) CAB 8o: 8.4 lbs. (3.81 kg)

AC Power:

Universal Power Supply:

1.4 A maximum, 100 to 240 VAC, 47 to 63 Hz

Power Consumption and Heat

Generation:

CAB 8i: 25 W, 85 BTU/Hr CAB 8o: 20 W, 68 BTU/Hr

Maximum In-Rush Current:

CAB 8i and CAB 8o: less than 1.4 Amps

Finish:

Grey powder-coat painted steel

Accessories:

One detachable AC cord, four rubber adhesive feet

Product Agency Compliance Listings:

UL, CUL, CE and FCC part 15, A

Frequency Response

T.H.D. versus Frequency

Functional Block Diagram

Mechanical Diagram

1.080"

27.438mm

11.698"

297.129mm

19.0"

482.6mm

16.840"

427.736mm

1.730"

43.942mm

1.730"

43.942mm

ARCHITECTSÕ AND ENGINEERSÕ SPECIFICATIONS

Audio specifications are measured with the input fed into the CAB 8i, digitally transmitted through an Ethernet hub, and the output fed out of the CAB 8o where relevant.

CAB 8i:

The Peavey CAB 8i shall provide eight channels of either microphone or line-level audio transmitted onto an Ethernet network. It shall provide full-bandwidth, high-quality audio transmission via 100BaseT (fast) Ethernet without lossy compression techniques, drop-outs or signal degradation by employing CobraNet audio transmission protocol to make Ethernet signal distribution deterministic. It shall employ 24-bit A/D converters with 20- or 24-bit selectable transmission quantization utilizing a 48 kHz sampling rate.

It shall have a frequency response from 20 Hz to 20 kHz, +0/-0.5 dB or better. Its total harmonic distortion shall be no more than 0.01% at 1 kHz and 0.02% at 20 kHz with a +4 dBu input signal. It shall have a dynamic range of 95 dBA and 93 dB unweighted for line-level signals, and an equivalent input noise level of Ð124 dB for microphone level signals. Input-commonmode-rejection ratio (CMRR) shall be greater than 65 dB at any gain setting. Maximum input level without clipping shall be +38 dBu while maintaining specified CMRR. CAB 8i input gain shall be from Ð9 dB to +60 dB in 1-dB steps. The CAB 8i input impedance shall be 2.2 k ohms at microphone level (20 dB pad out), and

22.2 k ohms at line level (20 dB pad in).

Control features shall include eight relays with both normally open and normally closed contacts, and eight channels of TTL control outputs, both of which are software controllable via an Ethernet link. Also included are eight channels of analog voltage-control ports that allow external switches, potentiometers or voltage sources to control MediaMatrix software parameters via an Ethernet link.

Front-panel indicators shall display the following status conditions: signal transmission, signal reception, transmission error, reception error, fault indication, link indication, conductor status, RS-485 control indication, and power presence. It shall have eight peakreading headroom meters to monitor the

analog level present at the input to the A/D converters, with the top-most red LED indicating A/D clipping.

Rear panel features shall include a detactable AC power cord, an AC power switch, and an AC power receptacle with a built-in auto-resetting circuit breaker. External or internal fuses shall not be acceptable. It shall have two word-clock connectors to enable auto-switch-over should a unit fail. It shall employ detachable, euro-style, bare-wire capturing, screw-terminal connectors for ease of hook-up and trouble-shooting. These connectors shall be used for all line-level, microphone-level, controlvoltage, TTL, relay, and RS-485 connections. The unit shall use a standard eight-conductor RJ-45 I/O jack for Ethernet connection.

Its dimensions shall be 19 inches (48.26 cm) wide, 12 7/8 inches (32.70 cm), and 1 3/4 inches (4.44 cm) high without feet. Its net weight shall be 8.5 pounds (3.86 kg.), and its 1 rack-unit (1 3/4"), fan-cooled, steel chassis, shall be finished in grey powder coat.

It shall consume no more than 25 Watts of power and draw no more than 1.4 Amps of current. It shall be supplied with a detachable AC cable and four rubber feet. It shall be UL, CUL, CE listed and comply with FCC part 15, A. The unit shall be Peavey Electronics Corporation model CAB 8i.

CAB 8o:

The Peavey CAB 8o shall provide eight channels of line-level audio transmitted from an Ethernet network. It shall provide full-bandwidth, high-quality audio transmission via 100BaseT (fast) Ethernet without lossy compression techniques, drop-outs or signal degradation by employing CobraNet audio transmission protocol to make Ethernet deterministic. It shall employ 24-bit A/D converters with 20- or 24-bit selectable transmission quantization utilizing a 48 kHz sampling rate.

It shall have a frequency response from 20 Hz to 20 kHz, +0/-0.5 dB or better. Its total harmonic distortion shall be no more than 0.01% at 1 kHz and 0.02% at 20 kHz with a +4 dBu output signal. It shall have a dynamic range of 95 dBA and 93 dB unweighted. Maximum output level shall be +24 dBu with a load of 600 ohms or greater. CAB 8o gain shall be from

Ð95.5 dB to +31.5 dB in 0.5 dB steps. The output impedance of the CAB 8o shall be 100 ohms and designed to drive a load of 600 ohms or greater.

Control features shall include eight relays with both normally open and normally closed contacts, and eight channels of TTL control outputs, both of which are software controllable via an Ethernet link. Also included are eight channels of analog voltage-control ports that allow external switches potentiometers or voltage sources to control MediaMatrix software parameters via an Ethernet link.

Rear panel features shall include a detachable AC power cord, an AC power switch, and an AC power receptacle with a built-in auto-resetting circuit breaker. External or internal fuses shall not be acceptable. It shall have two word-clock connectors to enable auto-switch-over should a unit fail. It shall employ detachable, euro-style, bare-wire capturing, screw-terminal connectors for ease of hook-up and trouble-shooting. These connectors shall be used for all line-level, control-voltage, TTL, relay, and RS-485 connections. The unit shall use a standard eight-conductor RJ-45 I/O jack for Ethernet connection.

Its dimensions shall be 19 inches (48.26 cm) wide, 12 7/8 inches (32.70 cm), and 1 3/4 inches (4.44 cm) high without feet. Its net weight shall be 8.4 pounds (3.81 kg.), and its 1 rack-unit (1 3/4"), fan-cooled, steel chassis, shall be finished in grey powder coat.

It shall consume no more than 20 Watts of power and draw no more than 1.4 Amps of current. It shall be supplied with a detachable AC cable and four rubber feet. It shall be UL, CUL, CE listed and comply with FCC part 15, A. The unit shall be Peavey Electronics Corp. model CAB 8o.

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