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4 6

The crossover filters and EQs share DSP resources between two DSP chips. There are certain

assignment constraints, the table below summarizes how the resources are allocated.

DSP Assignment table:

4C @>e ]RU b

D_ dQ\6Y\dU bc

?ed `e d!"

3 b_cc_ fUbc

?ed` e d#&

3 b_cc_ fU bc

9 ^` ed5 A

?ed `e d! "

5 A

?ed` e dc#&

4C @!

1\\

>_ ^U

1\\

C U S_ ^T

4C@"

>_ ^U

1\\

>_ ^U

6Ybcd

* The EQ for outputs 3-6 may come from either DSP 1 or DSP 2, but DSP 2 filters are used first,

until all DSP 2 resources are allocated.

Summing this up in words:

There are 18 filters in DSP 1, and 20 in DSP 2.

All of the crossover filters for Outputs 1 & 2 come from DSP 1.

All of the crossover filters for Outputs 3-6 come from DSP 2.

All of the Input EQ comes from DSP 1.

All of the Output EQ for Outputs 1 & 2 comes from DSP 1.

Output EQ for Outputs 3-6 may come from either DSP.

Other notes:

12dB/Octave crossovers use 1 filter per edge, except Linkwitz-Riley that uses 2.

18, 24 & 36dB/Octave crossovers use 2 filters per edge.

48 & 52dB/Octave crossovers use 4 filters per edge.

Stereo EQs use 2 filters each.

For example, a stereo 3 way 12dB/octave crossover would use DSP resources as follows:

4 filters are used in DSP 1 for Output 1 & 2 crossovers high edge crossovers. (2 per 12dB/

Octave Slope)

12 filters used in DSP 2 for Output 3-6 crossovers. (1 per 12dB/Octave Slope)

There is a total of (18-4)= 14 filters left in DSP 1 for either Input EQ or Outputs 1 & 2 EQ.

There is a total of (20-12)= 8 filters left in DSP 2 for any Output EQ.

DSP Filter/EQ Assignment

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Содержание FDS-334T

Страница 1: ...FDS 334T 336T Minidrive Manual Connect here first www audiovias com All manuals and user guides at all guides com...

Страница 2: ...1 1 About earth loops 1 1 Audio Connections 12 Balanced wiring 12 Unbalanced wiring 13 Controller Connections 13 Front Panel Interface 14 What s on the screen 14 Navigation Control 15 The Navipad 15...

Страница 3: ...334T only 25 Stereo Link 26 Step and Offset 26 Crossover Mode 27 Delay Units 27 Security Lock Outs 28 Security Settings 28 Lock Out 28 OEM Lock 28 Lock All 28 Lock set up mode 29 Confirming the Lock...

Страница 4: ...filter frequency 43 High edge filter type 43 High edge filter frequency 43 Assignable EQ 44 EQ T ype 44 EQ Frequency 45 EQ Cut Boost 45 EQ Bandwidth 45 DSP Filter EQ Assignment 46 T roubleshooting 47...

Страница 5: ...equency is listed on the label near the IEC power input connector BSS is not liable for product damage sustained by improper AC mains power connection T o properly set up and operate your BSS FDS 334T...

Страница 6: ...if the unit was purchased in the European Union you may return the unit to any other BSS distributor in the European Union You should include a statement listing the faults found The unit s serial num...

Страница 7: ...echanical Mounting The FDS 334T 336T occupies one standard 19 rack space 1U When mounted in an equip ment rack that is transported it should be supported by a shelf or other equipment to prevent flexi...

Страница 8: ...sing to perform the same tasks as analogue crossovers limiters equali sation and delay units Envisaged applications for the Minidrive include stage monitor set ups modest P A systems zoning and instal...

Страница 9: ...rity section for more details User memories and MIDI capability The audio system settings can be saved into one of 60 user Program locations for instant recall at any time Minidrives can be linked tog...

Страница 10: ...towers and clusters as well as transducer alignment Output limiters with adjustable thresholds and automatic attack and release settings based on crossover frequency protect speakers from overload da...

Страница 11: ...earth connection of the other component In effect the two paths to earth form a loop antenna which picks up interference currents from surrounding equipment Because of lead resistance these induced cu...

Страница 12: ...age your speakers and or amplifiers Balanced wiring High quality twin conductor shielded audio cables should always be used for all inputs and outputs The two Inputs are balanced female XLRs Input cab...

Страница 13: ...g cable should have the shield earthed to pin 1 at the FDS 334T 336T output the output cold should be connected to the unbalanced input 0V ground and the output hot should be connected to the unbalanc...

Страница 14: ...e stored Program this is the default screen n The top left shows the mode that the Minidrive is in Input Output or Utilities n The bottom left displays the currently selected parameter associated with...

Страница 15: ...that when turned changes the values in the value area of the screen If this control is pushed in it will also step through the Inputs Outputs and Utility modes If held down and turned it will also en...

Страница 16: ...CALL Used to store edited Programs to a new memory location and to recall saved setups from the internal memories T o select a preconfigured Program press the RECALL button on the front panel From new...

Страница 17: ...oth A B CLIP LEDs flash but the LED directly below the CLIP does not this would indicate that the DSP is clipping and not the analog input circuitry This situation would most likely be caused by exces...

Страница 18: ...rossover passband allocated via a variety of filter shapes and slopes Further driver equalisation can then be applied Utilities mode Accessed by pressing the UTILS button at any time These parameters...

Страница 19: ...te Program press RECALL Use the up down buttons located on the left side of the LCD screen to choose the correct Program Press RECALL again to enable the Program 6 Apply a signal source to the Minidri...

Страница 20: ...the key to go back to change or correct previously set characters Pressing STORE ENTER a second time will perform the store if the Program location is not locked Program Lock User Programs can be lock...

Страница 21: ...ogram press the UTILS button and scroll through the options until the screen below is displayed T o enter the Delete Program mode press either or turn the encoder clockwise this will change the screen...

Страница 22: ...your needs and change the parameters as necessary The configuration setting is saved as part of the Program data when a setup is stored to a user memory T o select the desired configuration use the na...

Страница 23: ...to 1 Low 2 Mid 3 High 4 Low 5 Mid 6 High for Out puts 1 6 respectively The Lo and Hi crossover frequencies are set to the following default values If the FDS 336T is used for a stereo 2 way only syste...

Страница 24: ...re the center channel is a sum of A and B Outputs 1 and 4 are routed from Input A Outputs 3 and 6 are routed from Input B Outputs 2 and 5 will be routed from Input sum A B All delay linking defaults t...

Страница 25: ...routed from input B All delay linking defaults to off Stereo Link will be switched on Band Names will be set to Low and High Utilities Configuration FDS 334T 2 way system with separate bass cabinets a...

Страница 26: ...e discrete selections instead they have a range of numerical values such as gain frequency or delay These parameters can have offsets between them when the channels are linked If any linked parameter...

Страница 27: ...ted units Utilities Delay Units Utilities Crossover Mode Crossover Mode This Utility allows the crossover slopes of the associated bands to be linked together for ease of setting For example when in B...

Страница 28: ...eing seen or adjusted These locks are stored with the Program Pressing from the Utilities screen shown above displays the password screen The default password is BSS Enter a new alphabetic password by...

Страница 29: ...er is now locked Select the particular parameters that are to be locked from view and change their values to check marks Conversely if Lock All was selected then select and change the parameters state...

Страница 30: ...her use the locked Program would have to be deleted using the Delete Prog facility in the Utilities The screen above shows a Program that has both been OEM locked indicated by the diamond symbol and t...

Страница 31: ...rogram mode Notes Locked Programs have to be unlocked before they can be deleted this applies to Program lock and the OEM Owner locks Utilities Delete Program Contrast The and parameter keys or rotary...

Страница 32: ...and is dependent on the use of the FDS 334T 336T in the system The possible selections are OFF No MIDI messages except systems exclusive dumps are transmitted PROGRAM Prog Enables the unit to transmi...

Страница 33: ...ritten then press the key on the receiving unit to change the Allow Dump message to No The receiving unit will return to normal operation and ignore any incoming Program information Pressing Up Down a...

Страница 34: ...or Input A Input B and Input A B There cannot be more than 635 417 ms of delay on any input to output path Delay units to represent this value as either milliseconds metres feet or frames per second a...

Страница 35: ...utputs are linked the band name is derived from the channel assigned to the lower numbered Output Similarly if the linked Outputs are offset the parameter value for the lower numbered Output is displa...

Страница 36: ...Input B or the sum of Inputs A and B denoted as Input A B When Stereo Linked in 2 channel 3 way mode the selection is normally Inputs A B Outputs Gain Gain Output channel gain is adjustable from 15dB...

Страница 37: ...e 1dBu 4dBu 8dBu and 18dBu Note that limiters are usually set slightly below the maximum settings Limiter Level Calculations The method for setting the limiting threshold is given by the following eq...

Страница 38: ...pressing the associated Output button recalculates the delay values for all displays and remembers this setting until it is either changed again or stored with a Program Outputs Delay Linking Delay Li...

Страница 39: ...will change to the same selection Outputs Polarity Outputs Delay Linking When using Delay Linking it is recommended that the adjustment order is 1 Driver alignment within cabinets 2 Cabinet alignment...

Страница 40: ...id high crossover frequency will produce some phase disturbance at the low mid crossover frequency causing the low mid crossover filter pair to be misaligned The same is true of the high pass filter w...

Страница 41: ...L R 12 BUT 18 BUT 24 BES 24 L R 24 BUT 48 L R 48 NTM36 NTM52 The screen above shows a low edge shape of Linkwitz Riley 24dB Octave on Outputs 5 6 labelled as High 50 00 45 00 40 00 35 00 30 00 25 00...

Страница 42: ...0 20 00 15 00 10 00 5 000 0 0 5 0000 20 100 1k 10k 20k Bessel 12 24dB Octave Slopes 50 00 45 00 40 00 35 00 30 00 25 00 20 00 15 00 10 00 5 000 0 0 5 0000 20 100 1k 10k 20k Butterworth 6 12 18 24 48dB...

Страница 43: ...to this output will not indicate on the Output meters High edge filter type The High edge filter frequency can be selected from Bessel 12 24dB Octave or Butterworth 6 12 18 24 or 48dB Octave Linkwitz...

Страница 44: ...creen above shows that this is the first EQ on Outputs 1 3 labelled as Low and that it is assigned in stereo denoted by the S which also indicates that two EQs are in use across the two channels A 12d...

Страница 45: ...electable gain from 15 to 15dB in 0 5dB steps Setting an EQ cut boost to 0dB effectively de assigns the filter allowing it to be assigned to another channel EQ Bandwidth Width is only available for Be...

Страница 46: ...f the Input EQ comes from DSP 1 All of the Output EQ for Outputs 1 2 comes from DSP 1 Output EQ for Outputs 3 6 may come from either DSP Other notes 12dB Octave crossovers use 1 filter per edge except...

Страница 47: ...u are adjusting will not go any further Y ou can check this by turning Stereo Linking Off and looking at the parameters in question As an example you could have a stereo EQ parameter that is linked wi...

Страница 48: ...34T 336T you could run out of DSP resources at some stage in some cases you might see the W arning No More Filters message This indicates that there are no more filter sections available in one or bot...

Страница 49: ...7 T2 T2 T2 T2 T2 T2 T2e T2e T2e T2e T2e T2e 4 4 66 66 66 66 66 66 _b Q _b Q _b Q _b Q _b Q _b Q C B B B B B B 6 8j 8j 8j 8j 8j 8j 8 C B B B B B B 8 6 8j 8j 8j 8j ED ED 5A _ U _ U _ U _ U _ U _ U 3B G1...

Страница 50: ...B B B B 6 ED 8j 8j 8j 8 C B B B B 8 6 8j 8j 8j ED 38 G1I CdUbU_ Y Y W TUVQe dc d_ 3 _g 8YWX B _g B 8YWX C 1 1 2 2 0 12 0 3 D_ D_ D_ D_ 7 4 T2 T2 T2 T2 5 T2e T2e T2e T2e 4 6 7 4 6 7 0 81 66 66 66 66 9...

Страница 51: ...U 6bUa eU S i 7Q Y 2 Q TgYTdX ed ed QbQ UdUb e d ed e d ed e d ed e d ed e d ed e d ed Q U C _ ebSU 7QY Y Yd 4U Q i 4U Qi Y _ Q bYdi _ CXQ U _ 6bU a eU S i 8Y CXQ U 8Y 6bU a eU S i 5A D i U 6bU a eU S...

Страница 52: ...gYTdX ed ed QbQ UdUb e d ed e d ed e d ed e d ed e d ed e d ed Q U C _ ebSU 7QY Y Yd 4U Q i 4U Qi Y _ Q bYdi _ CXQ U _ 6bU a eU S i 8Y CXQ U 8Y 6bU a eU S i 5A D i U 6bU a eU S i 7QY 2 Q TgYTdX 5A D i...

Страница 53: ...F5 39DI H H 16D5B D E38 H H 9D38 25 45B H H 3 DB 381 75 H H B 7B1 381 75 D beU e RUb CICD5 5H3 EC9F5 4e BUaeUcd 4e 6_ _gc b_WbQ BUaeUcd b_WbQ 6_ _gc H H CICD5 3 H H CICD5 B51 D9 5 H H 1EH 5CC175C H H...

Страница 54: ...sovers slopes High and Low shelving at 6dB or 12dB Octave or fully parametric with bandwidth of 0 05 to 3 0 octaves Frequency range 15Hz to 16kHz Amplitude of 15dB in 0 5 dB steps Delay Time 635 417ms...

Страница 55: ...5 5 FDS 336T Minidrive Block Diagram www audiovias com All manuals and user guides at all guides com...

Страница 56: ...56 www audiovias com All manuals and user guides at all guides com...

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