MM-8802 Break-out-Box

The MM-8802 Break-out-Box was built to replace the older MM-88xx first-generation BoBs.  Many features were added to bring the technology up to date and make the unit more efficient.  An important consideration in the design process was the addition of "slots" or sockets for interchangeable input cards (in two groups of four channels).  Here is a more complete list of features:

• Single EIA rack space package

• Forced air cooling

• 24-bit converters (The first-generation MM-88xx units utilized 18-bit converters)

• Universal sample rate support (instead of having separate units dedicated to specific sample rates)

• Eight audio inputs (mic or line capable with the use of the MM Line 4, MM Mic 4 or the MM AEC 4)

• Software selectable input sensitivity (instead of using jumpers inside the unit)

• Eight line-level audio outputs

• Software selectable full-scale output level

• Eight Control Voltage (CV) control inputs

• Eight TTL logic outputs

• Independent fault-monitoring dry contacts

• Front panel audio metering

• Front panel status monitoring

• Category 5 cabling interface (One for Transmit and one for Receive)

• New 50' cable distance (15.2 Meters)

• Legacy cable support (for connecting the MM-8802 to older DB-9 MM-DSP cards

• Universal power supply (100/120/220/240 VAC, 50/60 Hz)

MM-88xx Break-out-Boxes (Discontinued)

This section is included because many customers still have these first-generation BoB's installed in installations around the world.  The MM-8830, MM-8840 and MM-8848 were discontinued in January 2001.

MM-88xx's were available in different sampling rates, and all three share the same features. Each break-out-box (BoB) accepts eight channels of low impedance line level analog audio inputs, and provides eight channels of low impedance line level analog audio outputs. Additionally, each breakout box has eight input control ports (0-10V) and eight output control ports (5 Volt TTL). There are three models available, the MM8830 (32 kHz sample rate), the MM8840 (44.1 kHz sample rate), and the MM-8848 (48 kHz sample rate). All use 18 bit converters with oversampled quantization.

All MM88xx's used in a MediaMatrix system must be of the same sample rate, they CANNOT be mixed. The sample rate is selected both by the model of the 88xx chosen, and by setting the MediaMatrix software to the same sample rate (in the File | Compile Options Menu). The software must match the sample rate of the breakout boxes used in a system.

The Breakout Boxes produce a large amount of heat. Therefore it is necessary to provide adequate cooling. Peavey recommends that at a minimum, a blank panel be provided above each two BoB's in a rack. Another option is to fan cool the rack. See the Analog BoB Hardware section of this help file for wiring and level adjustment details.

One other factor in deciding on MM88xx's, is the fact that they must be located in close proximity to the MediaMatrix computer. The MM88xx's come with a special 6' "legacy" cable, that cannot be extended if the device is to work properly. If you wish to locate the MM88xx some distance away from the MediaMatrix computer, you should use CobraNet CAB devices (see below) or the MM8802 with the new RJ-style connection which provides distances up to 50' from the frame.

It should be noted that the MM88xx's do not include microphone preamplifiers, as they are line level in and out. If you desire to use microphones, we recommend the Peavey  A/A-8P. This is a single rack space, eight channel microphone preamplifier, that provides transformer balanced inputs with front panel gain controls, LED signal presence and clip indicators, switchable +48V phantom power, and switchable analog limiters. It uses Phoenix style connectors for inputs and outputs (like the MM88xx's).