BSS Audio FDS 310 User Manual

1FDS 310User Manual

10Getting to know the FDS-310Fig 6.1 Front PanelFig 6.2 Rear Panel

11All numbers in bubbles refer to Section numbers.

127.0 Mechanical InstallationA vertical rack space of 1U (1¾" / 44.5 mm high) is required. Ventilation gapsare unnecessary (See Figure 7.1).If th

13Connecting to Power8.0 Mains Power ConnectionVoltage: The FDS-310 operates on either 115 or 230 volt supplies. Use thevoltage selector switch to cho

14Input Connections9.0 Input ConnectionsEach jack socket accepts signal sources from a 3-pole (stereo), or 2-pole(mono), 'A' gauge phone plu

15Output Connections10.0 Output Connections10.2 Using XLRPlugsEach male XLR outputs a balanced signal - symmetrical to ground andfloating. The output

1611.0 Connection and Setup11.1 Selecting '2-Way' 2 ChannelOperationIn a 2-way system, the incoming full range signal is split into 2 bands.

17ALWAYS check the crossover frequency is set to a safe minimum figurebefore driving the system at high levels:• Set levels controls to their centre z

18Setting up -SchematicsFig 11.1 2- and 3-WaySetupsThe FDS-310 can drive sub-woofers ('Sub-Low or 'Sub-Bass' cabinets) whenswitched t

19Setting up -2-Channel Sub-Woofer Operation12.0 Monaural Sub-Woofer Operation -for stereo 2-way systems onlyBecause human hearing is insensitive to t

2This equipment has been tested and found to comply with the following European Standards forElectromagnetic Compatibility:Emission Specification: EN5

2014.0 How to Equalise CD HornsTodays 'Constant Directivity' (CD) horns and drivers can be used in 2-waysystems with comparatively low cross

2115.0 Full range Output -3-way operation onlyWhen switched on 'MONO 3-WAY' mode, the Channel 2 input ('FULLRANGE' in 3-way mode)

22Crossover Alignment Procedure17.0 Crossover Alignment Procedure:Setting the level controlsThe modern idea is to set the crossovers' level contr

23If the mid output is not enough, even when the crossovers MID RANGEcontrol is set at maximum (+6dB), check the mid-range power amplifierssensitivity

24• All EQ controls throughout the sound system should be set flat before settingup the FDS-310 LEVEL controls. Any house EQ adjustments can be madela

2519.0 Polarity switching and Output Polarityreversal optionEach frequency bands' control surface includes a POLARITY switch (SeeFigure 6.1). Dep

26No OutputProblem:Is the MUTE switch depressed?Is the mains power on? (See section 8).Check the connections. See Fuse failure (below).Do you have an

2721.0 Grounding/Earthing Procedures(Curing hums)The FDS-310 is supplied with the signal ground (0V) tied to chassis, which isconnected in turn to:• M

2822.0 Service SectionFig 22.1 Locating theFREQ switches22.1 2-ChannelSub-WooferOperationThis section refers to section 12 in regard to activating the

29Fig 22.2 Locating theMONO LOW/LINKINGswitchTo activate the equalisation:• Disconnect the mains power and remove the top cover plate.• Locate the 3-p

3ContentsContents1.0 What is a Crossover? 52.0 The difference between Activeand Passive Crossovers 63.0 Other advantages 74.0 The Linkwitz-Riley advan

30• Disconnect the power and remove the top cover plate.• Locate the green wire bolted to the chassis on the right side of the toroidaltransformer. Ch

3123.0 GlossaryActive electronic circuits are those which are capable of voltage and powergain by using transistors and integrated circuits.AmplitudeR

32EqualisationModification of the frequency response of an audio system, regardless oflevel, for corrective or enhancement purposes.FrequencyThe repet

33Input Impedance: Balanced bridging; 12k ohmsMax. Input Level: +20dBm/dBu/dBvThrough Gain: Input to any output with level control set at 0dB: 0dBFull

34This unit is warranted by BSS Audio to the original end user purchaser againstdefects in workmanship and the materials used in its manufacture for a

35IndexSymbols2-Channel Sub-WooferOperation. See Setting up2-Way 2 Channel Operation. SeeSetting up3-Way Mono Operation. See SettingupAActive Crossove

36WWarranty Info. 34Wiring Convention. See InputConnections: Output Connec-tionsXXLR Plugs. See Input ConnectionsZZero Phase difference. See Linkwitz-

37User Notes

38User Notes

39User Notes

4Contents16.0 LED indicators 2116.1 'Signal Present' 2116.2 'Peak' 2117.0 Crossover Alignment Procedure:Setting the level controls

40User Notes

51.0 What is a Crossover?CrossoversCrossovers are a necessary part of sound reinforcement systems because theloudspeaker drive-unit which can produce

62.0 The difference between Active andPassive CrossoversPassive crossovers divide the frequency spectrum after the signal has beenraised to a high pow

7Crossover advantages3.0 Other advantagesThe drive-units in sound reinforcement systems utilising active crossoversbenefit because:• Steep rolloffs ar

8Linkwitz-Riley Alignment4.0 The Linkwitz-Riley advantageThere is an additional set of advantages exclusive to active crossovers madeby BSS, and other

9BSS Crossovers5.0 What is special about BSS Crossovers?The FDS-310 is a condensation of over ten years experience, manufacturingthe industry's m