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BSS Audio FDS 355 User Manual

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FDS 355
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  • Page 1 FDS 355 User Manual...
  • Page 2 IT SHOULD NOT BE NECESSARY TO REMOVE ANY PROTECTIVE EARTH OR SIGNAL CABLE SHIELD CONNECTIONS TO PREVENT GROUND LOOPS. ANY SUCH DISCONNECTIONS ARE OUTSIDE THE RECOMMENDED PRACTISE OF BSS AUDIO AND WILL RENDER ANY EMC OR SAFETY CERTIFICATION VOID. For continued compliance with international EMC legislation ensure that all input and output cables are wired with the cable screen connected to Pin 1 of the XLR connectors.

  • Page 3: Table Of Contents

    Contents Contents Quick Start - Reference FDS-355 Omnidrive Introduction OMNIDRIVE Compact Loudspeaker Management System Other features Voltage setting AC Power fusing Unpacking Mechanical Installation Mains Power Connection Mains power Controls Input section Output section Rear panel Screen Layout Default Screen Utilities Menu Inputs Menu Outputs Menu...
  • Page 4 Contents 13.0 Phase Compensation 14.0 Typical Applications 14.1 Stereo 2-Way with a mono sub-bass 14.2 Dual Bi-amp (Stage monitors) 14.3 5-Way zoning distribution 14.4 Mono 5-way 15.0 Quick Reference - How to ... 15.1 Use delays to Time align drivers 15.2 Keep relative delays while delaying a group...

  • Page 5: Quick Start - Reference

    Quick Reference Quick Start - Reference FDS-355 AC Power connection Omnidrive The FDS-355 has a universal voltage AC Power input. Connect the FDS-355 to AC Power with the lead supplied. The unit will switch on automatically (there is no separate on/off switch). The display will show the default screen, with the current program (if selected), and overall system response curves.

  • Page 6: Quick Reference

    Quick Reference Setting the crossover points Select the band to be edited by pushing the parameter wheel to cycle through inputs and outputs. Note the LEDs above each channel change as the screen changes. Once the band has been selected, press the UP/DOWN keys until the first crossover (Filter shape - Low slope) screen appears.
  • Page 7 Automatic Phase Compensation Automatic phase compensation is employed in the FDS-355 to maintain zero phase difference between adjacent bands, even in 4 and 5-Way systems, where the phase errors due to the effects of closely spaced crossover filters can be significant. Phase compensation helps you to keep the response of the system with the minimum of 'fiddle factor' adjustments.

  • Page 8: Introduction

    Introduction Introduction 1.1 OMNIDRIVE An arrangement of 3 inputs and 5 outputs, and an additional internal sum of inputs A&B, can be matrixed in any combination to provide a complete Compact loudspeaker management system with integral crossovers, delays, EQ, and Loudspeaker protection limiters.

  • Page 9: Voltage Setting

    Voltage/Fusing Unpacking 1.3 Voltage setting The FDS-355 uses a switched-mode power supply which offers high efficiency and low heat generation. This power supply accepts universal AC Power input voltages in the range 100V AC to 240V AC (nominal), and requires no setting adjustment for AC power voltages in this range.

  • Page 10: Mechanical Installation

    Mechanical Installation Mechanical Installation A vertical rack space of 1U (1¾" / 44.5 mm high) is required. Ventilation gaps are unnecessary (See Figure 3.1). If the FDS-355 is likely to undergo extreme vibration through extensive road trucking and touring, it is advisable to support the unit at the rear and/or sides to lessen the stress on the front mounting flange.

  • Page 11: Mains Power Connection

    Mains Power Connection Mains Power Connection Refer also to sections 1.3 and 1.4; Voltage setting and AC Power Fusing. 4.1 Mains power WARNING! THIS APPLIANCE MUST BE EARTHED. IMPORTANT: The wires in the mains lead are colour coded in accordance with the following code.

  • Page 12: Controls

    Front Panel Controls Controls 5.1 Input section Fig 5.1 Front panel Store key Program data can be stored to either internal memory, or a PC card, and is done by using the store facility. The STORE key also doubles as an ENTER key for confirmation of some actions.
  • Page 13 PC card slot The card slot is used for storing/recalling program data via a PC card. Refer to section 16.0; PC Card for more information. Input LEDs These indicate which (combination of) input channels are being edited. The Card LED underneath illuminates when a PC Card is inserted into the front panel slot.

  • Page 14: Output Section

    Output section 5.2 Output section Fig 5.2 Output section Edit LED Lights up when the output is being edited. Output meter Mute LED Shows the mute status of the output band. Mute key Pressing a mute key will toggle the associated band output on and off. The mute LED is illuminated when the output is MUTED.

  • Page 15: Rear Panel

    Rear panel 5.3 Rear panel Fig 5.3 Rear panel Mains power input The Power inlet for the FDS-355. Note that there is no On/Off switch for the unit. Fuse RS-232 connector For connection to a PC for access to one or more FDS-355s on a MIDI loop, which provides an easy way to upload new software.

  • Page 16: Screen Layout

    Screen layout - Overview...
  • Page 17 Moving about the screens Use the parameter wheel to move between Default, Utility, Input and Output menus (Vertical columns). Pushing the wheel in, or pushing and holding the wheel in while turning clockwise, will move to the next screen on the right. Pushing and holding the wheel while turning anti-clockwise will move you a screen to the left.
  • Page 18 Key screens After powering up, the FDS-355 performs internal checks and sets up the audio path before releasing the output mute relays. This takes a few seconds. Refer to section 6.0; Default screen. Pushing the UP key will enter the Utilities Mode. Many of the utility screens Utilities are self explanatory (see Screen layout on the previous two pages), but the more important ones are shown below.
  • Page 19 Output settings The name screen. Allows each output to be given a descriptive name from a preset list. Refer to section 9.0; Outputs menu. The source screen allows the user to configure the routing of the inputs to the outputs. Refer to section 9.0;...

  • Page 20: Default Screen

    Default screen Default Screen Program Output band Program Unsaved name curves number changes flag When the FDS-355 is powered up the Default Screen is shown. This gives a representation of the current state of the unit. If the unit has Lock Out mode ON, the Default screen will be replaced by the current start up logo, along with the current program name and number.

  • Page 21: Utilities Menu

    Utilities menu Utilities Menu Previous 3 Selected Selected utility utilities utility parameter Pushing the UP key while viewing the default screen will move you into the Utilities menu. The UP and DOWN keys are used to move along the 'Utilities' path, and the parameter wheel is used to change the selected parameter.
  • Page 22 Utilities menu Delay correction Allows a delay correction to be entered, to compensate for ambient temperature. With Delay Corrn set to 'Off', the default temperature is set to 20 C. Setting Delay Corrn to 'Manual' allows a user defined value to be entered, from -20 C to 50 C, in 1 C increments.
  • Page 23 This allows you to change the contrast of the LCD display. Contrast This allows you to change the brightness of the LCD display. Brightness Owner lock The Owner Lock screen allows the owner of the unit to program a system and then lock the unit against being reset.
  • Page 24 Utilities menu NOTE: You can select either band in order to adjust the crossover - the lower band or upper band - and either adjustment will move both band edges together, updating the data for the other band. EDGE When set to Edge mode, each band edge is adjustable independently. This allows the possibility to create band overlaps at the crossover point.

  • Page 25: Inputs Menu

    Inputs menu Inputs Menu There are three inputs available for routing to outputs plus an internal mono sum of inputs A and B, referred to as A+B. This gives the Input Channels: A, B, A+B, and C. The facilities described in this section are common to all inputs, except EQ, which is not possible on the mono sum A+B signal.

  • Page 26: Outputs Menu

    Outputs menu Outputs Menu To select any one of the 5 output bands, press the parameter wheel until the output is shown on the screen, and the EDIT led above the desired channel illuminates. Pushing and holding the encoder, then pressing a mute button, will take the display to the corresponding output channel.
  • Page 27 Low shape This screen is used to select the filter type/shape for the lower band edge (high-pass) of the current output band. The band edge will be highlighted on the graphic on the screen. The available filter types are as follows, in this order: Butterworth 6dB / Octave Butterworth 12dB /Octave Bessel 12dB / Octave...
  • Page 28 Limiter settings are preserved when a user saves a program - limiters will automatically be set to ON NORMAL if the limiters were on. NOTE: BSS Audio cannot accept any liability for any damage caused by disabling the protective limiters in the FDS-355. This function is used totally at the discretion of the user.
  • Page 29 The band delays are most often used to electronically align the driver voice Delay coils with the other drivers in the system, so the sound sources are coherent in the physical plane. Each increment is only 11 microseconds, which translates in physical terms to a distance of 3.4mm, giving high accuracy in terms of alignment.

  • Page 30: Eq Screens

    EQ menu 10.0 EQ Screens Current Parameter Input being edited Unused EQs selection Current Parameter Frequency Cut/boost Cursor Stereo Width marker If the FDS-355 is configured for MONO, all EQ’s will be mono. If configured for 2x2+1 ("stereo"), EQ’s will be marked as Stereo 'S' when STEREO LINK is ON, and the stereo marker will show an 'S' next to the EQ number.
  • Page 31 Frequency Turning the parameter wheel adjusts the EQ frequency. The filter position is shown graphically by the cursor, and the Frequency of EQs can range between 15Hz and 16kHz. Turn the parameter wheel clockwise to add boost (+ gain) or anti-clockwise Cut/Boost for cut (- gain).

  • Page 32: Store And Recall

    Store and Recall 11.0 Store and Recall Storing and Recalling a program can be done at any time using the STORE and RECALL keys on the left hand side of the LCD, unless Backup and Swap (see section 7.0; Backup and swap) has been turned on. The FDS-355 can hold 60 programs internally, and these can also be saved to a PC card (refer to section 16.0;...

  • Page 33: Recalling

    giving you the option to turn off the lock if you wish to overwrite the existing program. STORE TYPE There are 3 ways in which data can be stored, and these are indicated by the STORE TYPE message at the top of the display. To highlight the Store type message, use the DOWN key while a program number is highlighted.

  • Page 34: System Headroom Management

    Headroom Management System (HMS) Phase Compensation 12.0 Headroom Management System Headroom Management System (H.M.S) is employed in the FDS-355 to make maximum use of the dynamic range of the devices inside the unit. In systems where limiter threshold levels are low, the output signal excursions are restricted, and thus make poor use of the available dynamic range.

  • Page 35: Typical Applications

    Typical Applications 14.0 Typical Applications The FDS-355 has three inputs: A, B, C. An internal mono sum of inputs A & B is also available for routing to any of the outputs. Any combination of routing inputs to outputs is available, and the FDS-355 can be configured as a stereo or mono device.

  • Page 36: Mono 5-Way

    Typical Applications 14.4 Mono 5-Way In the mono mode, the FDS-355 can provide a full 5-way system. It can also function as a 4-way system fed from input A, with an independent sub-bass output fed from input C (or B). Two FDS-355s working in this mode can form a stereo 5-way system.

  • Page 37: Quick Reference - How To

    Quick Reference - How to ... 15.0 Quick Reference - How to ... 15.1 Use delays to The best way to do this is to have a good idea of the physical positions of the voice coils of the drivers in the cabinet. If you do not know this, an estimate Time align ®...

  • Page 38: Add Eq For Constant Directivity Horns

    Quick Reference - How to ... 15.5 Add EQ for Constant Directivity horns often require additional equalisation in order to extend their frequency response. In most cases, this is a fairly simple EQ, Constant Directivity requiring only a gentle slope (6dB per octave) high-pass shelving filter. horns To add CD EQ, select the band to be equalised by pushing the parameter wheel, and push the UP/DOWN keys until you reach a free EQ band refer to...

  • Page 39: Pc Card

    PC Card 16.0 PC Card The PC Card socket on the front of the unit is designed to use memory cards of between 128kbyte and 2Mbyte storage capacity. Files are stored on the card in a ‘Pseudo-floppy’ format using standard DOS structures. See the box at the end of this section for compatibility information.

  • Page 40: System Security

    System Security 17.0 System Security Any changes made to an audio system have the potential to be damaging, even if only accidentally made. For this reason several different security systems are built in to the FDS-355 to protect the speakers. Each of the security levels locks different groups of variables away from accidental or malicious adjustment.

  • Page 41: Oem Lock

    the required parameters have been locked out, the STORE key should be pressed again - prompting for a user password to be entered. The action of pressing the STORE key a final time is to exit Owner Lock setup mode, leaving the Owner Locks in place, ready for the user. The owner can set more locked parameters by turning Owner Lock from active to off (utilities menu) using the user password, and then back to active (which requires the default password) to start setting owner locks.

  • Page 42: Safe

    System Security For example, recalled OEM program 1 cannot immediately overwrite program 1, even if the same OEM password is used, and the message 'Program Locked' will appear. The OEM Lock must first be turned off, and then turned back on again (using the same password).

  • Page 43: Troubleshooting

    Troubleshooting 18.0 Troubleshooting Problem: Unit does not power up. Solution: Check power cable is inserted properly at back of unit. Check the fuse at the rear of the unit has not blown. Problem: No output. Solution: Ensure mutes are not active. Problem: All 3 Input LEDs light up at once.

  • Page 44: Warranty Information

    19.0 Warranty Information When sold to an end user by BSS Audio or a BSS Audio Authorised Reseller, this unit is warranted by the seller to the purchaser against defects in workmanship and the materials used in its manufacture for a period of one year from the date of sale.

  • Page 45: Specifications

    Specifications 20.0 Specifications and Block Diagram Dynamic Range Typically >106dB, Analogue Input/Output, unweighted 22Hz to 22kHz Frequency Response <±0.25dB, 15Hz-20kHz with filters out Distortion (THD) <0.01%, 20Hz-20kHz @+10dBu Inputs Electronically balanced & floating (Transformer balanced option) Input Impedance 10k Maximum Input Level +20dBu, balanced Outputs Electronically balanced &...

  • Page 46: Index

    Index Index shape width Applications EQ screens 5-Way Zoning Distribution EQ shape Dual Bi-amp Mono 5-Way Stereo 2-Way with a mono sub-bass File Allocation Table Frequency Xover Backup Full range band band gain Fuse Block Diagram Brightness Gain trim Gain trims CD Horns storing adding EQ...
  • Page 47 Index MIDI connectors Quick reference details adding EQ for CD Horns dump Keeping relative delays setting channel number Making a band full range setting mode Naming a band Mode LED Time aligning drivers Mono mode Mute key Mute LED Rack space requirements Rear panel OEM Lock...
  • Page 48 Index delete program Format PC Card Limit Units Lock Out menu MIDI channel MIDI dump MIDI mode OEM Lock Owner Lock Xover mode Voltage setting Warranty info Width Wiring convention Xover adjust Output - High freq Output - High shape Output - Low freq Output - Low shape...
  • Page 49 User Notes...
  • Page 50 User Notes...
  • Page 52 User Notes...

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