FDS-388
OMNIDRIVE^tm Loudspeaker Management System

The OMNIDRIVE system represents a radical step forward in DSP processing for loudspeaker management, incorporating BSS's vast experience in crossover design and combining two channels of 4-way crossover, parametric equalisation, digital delay lines and limiters, and is designed for use in all areas of sound control. A compact 2U chassis means reduced interconnections, cabling and rack weight, while increasing rack space availability. Major facilities include password protection, automatic correction for HF response with humidity and delays with temperature.

The user front-end is remarkably simple, combining a real-time graphical display with an analogue-like output control section with led meters for full indication of system performance. The screen shows crossover response, EQ curves plus delay and limiter data in high-resolution graphics. System settings can be stored in up to 60 user memories, for quick and easy setup.

The crossover sections can be configured as stereo 2, 3 or 4 way, with the option of setting one stereo band as a mono-lo output for sub-bass processing. Various filter types may be selected with slopes of 12, 18 or 24 db per octave.

Parametric EQ is provided as two sections of fully adjustable EQ per band of processing, one section being configured as a 0-180 degree adjustable phase control, with polarity switching as standard through a separate independent function. The EQ range is 15Hz to 16kHz, gain adjustable +/- 15db, with a Q from 0.05 to 3 octaves, switchable between bell or shelving response.

The limiters are located mid-band, an optimal configuration originated by BSS and now widely adopted. Each band also incorporates a delay line, with adjustable delay in unusually fine 11 microsecond steps up to 650 milliseconds and displayed in feet, metres or milliseconds.

Remote control of the FDS-388 can be achieved using the FPC-900 Remote, or the new Soundbench V3 PC software which allows full control of all the parameters on a network of devices which may include FDS-355, FDS-388/380 and FCS-920/926 units.

System Features

Stereo or 2 channel, 2, 3 or 4-way operation
Two parametric EQ sections per band
Delays up to 650mSec
Mid-band limiters on every band
Polarity invert and optional phase adjust on each band
60 user programmable memories
On-line SWAP facility for direct A/B comparisons
Sophisticated password protection and data 'hide' functions
Led meter on each output
Data archive to PCMCIA memory card
Optional Input and Output transformer balancing
Optional Humidity/Temperature auto correction system
MIDI interface / Open architecture port

BSS Audio FDS-388 OMNIDRIVE Technical Specification

Filters flat, sample rate 48kHz, without balancing transformers, unless specified)

Input Section

IMPEDANCE
10kOhm, Electronically Balanced
MAX. INPUT LEVEL
+20dBu, balanced
DYNAMIC RANGE
Typically 105dB, Analogue In/Out, unweighted, 20Hz-20kHz
CONNECTOR (Analog)
XLR3-31 or equivalent.

Output Section

OUTPUTS
Electronically balanced and floating.
MAX. OUTPUT LEVEL
+20dBu into 600 Ohms, balanced.
CONNECTOR (Analog)
XLR3-32 or equivalent.

Crossover Filters

FILTER TYPES
Bessel, Butterworth, or Linkwitz-Riley.
FILTER SLOPES
Global selection of 12, 18, or 24dB per octave. Individual band edges may be set to any of the three slopes.
CROSSOVER POINTS
Fully adjustable for overlap/underlap.

Equaliser Sections

BANDS
2 Parametric sections per output.
FREQUENCY RANGE
Adjustable, 15Hz-16kHz.
Q (BANDWIDTH)
Adjustable, 0.1 to 3 Octaves.
GAIN
Adjustable, +/-15dB.

Delays

NUMBER
1 per output.
RANGE
Adjustable, 0 to 650 Milliseconds.
STEPS
11 Microsecond.
READOUT/ADJUSTMENT
Feet, Metres, or Milliseconds.

Limiters

TYPE
Peak.
LOCATION
Mid-Filter.
THRESHOLD
Adjustable, -10 to +16dBu.

System Performance

FREQUENCY RESPONSE
15Hz-20kHz, +/-0.25dB.
DISTORTION (THD)
Less than 0.01%, 20Hz-20kHz, @+10dBu.
GROUP DELAY DISTORTION
Less than +/-5 microseconds, 20Hz-20kHz.
CHANNEL SEPARATION
Better than 75dB, 20Hz-20kHz.
STEREO TRACKING
Less than 5 degrees, 20Hz-20kHz.

General

POWER REQUIREMENTS
AC Mains, 120V (99-121V), or 240V (204-264V), selectable, plus internal 100V setting. 50/60Hz, Less than 60VA.
WEIGHT
9Kgs (20lbs).
DIMENSIONS
2U Rack Mount, 88mm x 482mm x 355mm (3.5" x 19" x 14")

Options

Input/Output balancing transformers
Meteorology Probe