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DSC260 Preliminary Owners Manual

Revision 0.9

13

7.4.1 Limiter Level Calculations: The DSC260 comes from the factory with suggested limiter settings for various

JBL systems. These limiter settings are guidelines for use with specific JBL power amplifiers. There
are two primary uses for these limiters: One is for prevention of amplifier clipping and the second is to
limit the amount of power transmitted to the transducers. When using JBL MPA and MPX power
amplifiers consult the tables in Appendix B for recommended settings for specific amplifiers and power
levels. For other amplifiers or transducers, the method for setting the limiting threshold is given by the
following equation:

Limiting Threshold (dB) = Transducer voltage limit (dBu) - Amplifier gain (dB)

As an example, we first convert a transducer power rating into dBu. Our example transducers has a
continuous power rating of 600 watts. With an impedance of 8 ohms, this corresponds to a voltage of:

Voltage = (600 x 8)

0.5

= 69.28 Volts

Expressing this in dBu:

20 log (69.28/0.775) = 39.03 dBu

Next you find the amplifier gain from the published specification in the spec sheet or owner’s manual.
For this example, we will use an MPA1100 amplifier which has 38dB of gain and use the formula:

Limiting threshold = 39dBu - 38dB = 1dBu.

This would be the limiter threshold for 600 watts continuous output into the 8 ohm transducer.

7.5 Variable Output Delay 0 - 635ms: The Plus and Minus buttons accelerate in their effect the longer the buttons are held by increasing

the size of the steps. To return to the small increment settings release the key then press again to begin with 21 µs steps again.
At no time can there be more than 635.417 ms of delay on any input to output path. Delay units are set in the Utility section from a
list of Milliseconds, Meters and Feet/Inches using the parameter keys in the Utility “Delay Units” section. These are displayed as
ms, m and ft, respectively.

Output 1 delay:

OUT 1 Subs

Delay 600.000ms

Outputs 2 and 3 stereo linked:

OUT 3&4 Mid

Delay 600.000ms

Output 1 delay in feet and inches:

OUT 1 Subs

Delay 11' 12.9”

Output 1 delay in meters:

OUT 1 Subs

Delay 3.433m

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Содержание DSC260

Страница 1: ...DSC260 Digital System Controller Owners Manual 8500 Balboa Blvd Northridge CA 91329 ...

Страница 2: ... 5 0 ULTILITY CONTROL PARAMETERS 6 5 1 STEREO LINK 6 5 2 DEVICE CONFIGURATION 7 5 3 DELAY UNITS 7 5 4 LOCK OUT 8 5 5 MIDI CHANNEL 8 5 6 CONTRAST 8 5 7 OEM LOCK 8 5 8 MIDI DUMP 8 5 8 PROGRAM DELETE 9 6 0 INPUT SECTIONS 11 6 1 INPUT DELAY 11 6 2 INPUT EQ 11 7 0 OUTPUT SECTION NAME SOURCE DELAY AND POLARITY 12 7 1 NAME 12 7 2 INPUT SOURCE 12 7 3 OUTPUT GAIN 12 7 4 LIMITER THRESHOLD 12 7 5 VARIABLE OU...

Страница 3: ...SOVER OR EQ BUT IT WON T GO AS HIGH OR AS LOW AS I WANT 23 11 6 I CAN T GET THE DELAY TO GO TO IT S MAXIMUM OF 635 MS 23 11 7 I DON T HAVE ANY LINKED DELAYS BUT I CAN T GET THE MAXIMUM 630MS OUT OF THE UNIT 23 11 8 WARNING NO MORE FILTERS 23 11 9 THE DSC260 HAS A SPLIT PERSONALITY 23 11 10 START WITH THE BASS 23 11 11 I VE DONE IT YOUR WAY BUT I NEED MORE EQ ON INPUTS OR OUTPUTS 1 2 24 12 0 SPECIF...

Страница 4: ...HUMIDITE All DSC260 products are fitted with a detachable power cord supplied which connects to the chassis AC connector The power cord has an IEC female connector on one end and a male mains connector on the other end This cord is supplied specifically to accommodate the different safety and electrical code requirements of individual countries The power cord supplied with your DSC260 has a 3 pin ...

Страница 5: ...ion depends on the controller s setting and your chosen amplifiers Carefully follow this manual s instructions for a long and p roductiverelationshipwith your system The DSC260 contains the following Active crossover filters with up to 48dB Octave slopes to divide the audio spectrum into separate passbands for each transducer Six outputs can be derived from either of the two inputs or asum of both...

Страница 6: ...of ground loops hum If hum occurs see Appendix A for suggested correct audio signal wiring and system grounding Replace fuse only with a new fuse of correct size 20 mm and rating T1A250v Figure 1 DSC260 Back Panel 2 4 Audio Connections The DSC260 has two balanced inputs and six balanced outputs that can accommodate both balanced and unbalanced signals and are wired with Pin 2 hot The two female XL...

Страница 7: ...to A and Right to B In the case of a mono system use input A 5 Connect the outputs of the controller to the amplifier input channels maintaining the Left and Right identification Typically the higher the number of the output the higher the frequency content i e In a 2 channel 3 way default outputs 1 2 are Low 3 4 are Mid and 5 6 are High As the outputs vary depending upon the type of system and pr...

Страница 8: ...mple if a 4dBu signal is routed to an output and the gain is set to 0dB and the limiter is set to 10dBu then the 6dB Led would light indicating 6 dB of headroom 10dBu 4 0 dBu 6dB 4 3 Mute Pressing any of the front panel Mute keys will toggle the respective channel in and out of mute The LED will reflect the mute status A Red LED on signifies the output is muted Figure 4 Store Recall and Parameter ...

Страница 9: ...gure 5 All inputs and outputs are configured in rows with their respective parameters in columns There are rows for Input A Input B Input Sum A B and Outputs 1 though Output 6 In addition a row of Utility Control parameters is included The Up and Down Access keys move the user between rows The Next and Last keys step the user through the variables within the currently selected row See section 9 0 ...

Страница 10: ...s gain frequency or delay can have offsets between them when the channels are linked These are called Offset Variables If any linked variable reaches the variable s limit none of the linked variables will be able to move further in that direction Table 1 detail these relationships Link on and off UTILITIES Stereo Link On Parameter Linking Type 2 Channel 3 Way 3 Channel 2 Way Input Delay Offset Var...

Страница 11: ...s a sum of A and B This 3 channel x 2 way configuration will force Outputs 1 and 4 to be routed from Input A and Outputs 3 and 6 to be routed from Input B Outputs 2 and 5 will be routed from Input A B All delay linking will be switched off and Stereo Link will be switched on Band Names will be forced to Low and High Switching to Mono configuration will force all Outputs to be routed from Input A D...

Страница 12: ...15 5 6 Contrast The Parameter keys increase decrease the LCD display contrast A graphical indication of the variable changing is displayed Contrast UTILITIES Contrast 5 7 OEM Lock Pressing the Plus button will take the user into the OEM Lock password screen See section 10 for more information on this function OEM Lock LOCK UTILITIES OEM Lock Off 5 8 Midi Dump This utility is used to dump program i...

Страница 13: ...ng unit will return to its normal operation and ignore any incoming program information Pressing Access Up or Down at any time will return the sending unit to the Utility list Pressing Store Enter on the sending unit performs the dump The screen displays a percentage of the dump performed See Appendix C on MIDI Sysex for additional information Midi Dump screen Midi Dump 50 5 8 Program Delete The P...

Страница 14: ...DSC260 Preliminary Owners Manual Revision 0 9 10 5 8 3 Pressing Store Enter a second time will delete the program ...

Страница 15: ...re held by increasing the size of the steps To return to the small increment settings release the key then press again to begin with 21 µs steps again Delay units are set in the Utility section At no time can there be more than 635 417 ms of delay on any input to output path Input A delay in feet and ins IN A Delay 715 2 9 Input A delay in meters IN A Delay 218 005m 6 2 Input EQ Input A and B can ...

Страница 16: ...ked in 2 channel x 3 way mode the selections are normally Inputs A B Notice the in place of the sign to denote A and B not A plus B which signifies a sum of the two inputs Output 1 source OUT 1 Subs Source IN A Stereo Linked Output 1 2 source OUT 1 2 Subs Source IN A B 7 3 Output Gain 25dB to 4 dB in 0 5dB steps The nominal setting for outputs is 10dBu The DSC is set up to operate normally with a ...

Страница 17: ...600 x 8 0 5 69 28 Volts Expressing this in dBu 20 log 69 28 0 775 39 03 dBu Next you find the amplifier gain from the published specification in the spec sheet or owner s manual For this example we will use an MPA1100 amplifier which has 38dB of gain and use the formula Limiting threshold 39dBu 38dB 1dBu This would be the limiter threshold for 600 watts continuous output into the 8 ohm transducer ...

Страница 18: ...r delay tower set up The following table shows the linkable channels in each mode Output Mono 2channel x 3 way 3 channel x 2 way 1 2 3 4 2 3 4 5 3 4 5 6 4 5 6 None 5 6 None None 6 None None None Table 2 Delay Linking Relationships Delay Linking OUT 1 Subs Delay Link Off OUT 1 Subs Delay Link to 2 7 6 Switchable Polarity Normal or Inverted Using the Plus and Minus keys the user can invert the polar...

Страница 19: ...k 10k 20k FREQ Hz High Filter Edge Low Filter Edge Edge Frequency Figure 9 Filter Edge Identification 8 1 Low edge filter type Using the Plus and Minus Keys the Low edge filter type can be selected as Butterworth 12 18 24 or 48dB Octave or Linkwitz Riley 12 24 and 48dB Octave The options are displayed as BUT 12 L R 12 BUT 18 BUT 24 L R 24 BUT 48 L R 48 The screen below show a low edge shape of But...

Страница 20: ... Freq 220Hz Note If the Low edge filter frequency is raised beyond 16kHz the channel output will be switched off This is different from Mute in that any signal assigned to this output will not indicate on the output meters Output meter deflection on unused outputs might confuse an operator 8 3 High edge filter type As with the Low edge filter frequency there are selections for Butterworth 12 18 24...

Страница 21: ...no 9 1 EQ Type selectable Lo6 Lo12 Bell Hi6 or Hi12 The Sp value represents the number of filters available to the current channel In this case eight spare EQs are available This value may be different for different channels depending on the power available in each DSP See Section 11 on Techniques Tricks and Traps This screen shows that this is the first EQ on output 5 which has been labeled High ...

Страница 22: ...T 5 High Eq1M Frq 220 0Hz 9 3 EQ Cut Boost 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 cut boost on Output 5 OUT 5 High Eq1M 15 0dB 9 4 EQ Bandwidth 0 05 to 3 00 Octaves in 0 05 Octave steps Width is only available for Bell type EQs The limits of the width are shown in Figure 14 EQ width on Output 6 OUT...

Страница 23: ...DSP 2 but DSP 2 filters are used first unless all DSP 2 resources are allocated There are 18 filters in DSP 1 and 20 in DSP 2 All of the crossover filters for outputs 1 2 comes 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 come from DSP 1 12dB Octave and 24dB Octave crossovers use 2 filters per edge...

Страница 24: ...oring An internal store will fail if the lock key character is ON when Store Enter is pressed The PROGRAM LOCKED message will stay on the screen for 3 to 4 seconds or until the user presses another key If the user changes the lock character to off with the Minus key then the Store will be successful Alternatively the user can press Access to return to the Default screen Store has failed because pr...

Страница 25: ...s in locations 1 2 and 3 come with no OEM password These can be used to create your own OEM programs OEM Password screen OEM PASSWORD KONA____ 10 5 4 Once in the OEM Lock set up mode the user moves around the Input and Output screens as if selecting variables to adjust The utility screens are not accessible in Lock set up nor are the Store and Recall screens In the Lock set up mode the unit is alw...

Страница 26: ... will jump to the next channel 10 5 7 If the unit is powered down while in OEM mode the unit will return to OEM locked when the unit is turned back on with the current password still valid 10 5 8 An OEM Locked program has a small padlock icon next to the program name when you scroll through using the Store and Recall Functions RECALL 31 MADISON Note You cannot store a new program in an OEM locked ...

Страница 27: ...d adjust the EQ on output 5 upward it will only go to 11kHz not all the way to 16kHz This is because as you adjust output 5 upward output 6 also goes upward to a maximum of 16kHz 11 6 I can t get the delay to go to it s maximum of 635 ms As with example 11 5 above linked parameters can cause confusion when they are linked with offsets If a linked delay is at its maximum trying to adjust another li...

Страница 28: ...re Input EQ available adjustment of individual band EQ must be used or EQ must be de assigned from outputs 1 2 to free up EQ for the inputs Freeing up EQ on outputs 3 6 will not free up resources for input EQ because the filters come from different DSPs Table 3 Filter Assignment Recommendations 11 11 I ve done it your way but I need more EQ on Inputs or Outputs 1 2 If you have maxed out EQ on the ...

Страница 29: ... with signal present 12 6 and 3dB and Clip Display 2 x 16 Character Backlit LCD Limiters Mid Band Limiters with variable threshold of 10 to 10dBu Power Requirements 100 240 Volts 50 60 Hz 10 Sample Rate 48 kHz A D Conversion Assignable Equalization An array of up to 38 bands of EQ can be assigned to the inputs and outputs Dependent upon slopes of crossovers used High and Low shelving at 6dB or 12d...

Страница 30: ... but rather left to perform a cable shielding function only Under no circumstances should safety ground wire be removed from the AC power connector as an interim measure to achieve similar results Avoiding ground loops A typical example of a ground loop situation is shown in the diagram below Two interconnected components of a system are grounded through their individual AC power ground connection...

Страница 31: ...ntil the correct setting is visible Press RECALL after the cursor is on the setting 4 Connect the console outputs to the inputs of the DSC260 Left to A and Right to B In the case of a mono system use input A 5 Connect the outputs of the controller to the amplifier input channels maintaining the Left and Right identification Typically the higher the number of the output the higher the frequency con...

Страница 32: ... MPA 275 4 dBu 2 dBu MPA 400 3 dBu 0 dBu 1 dBu MPA 600 5 dBu 2 dBu 1 dBu 1 dBu MPA 750 6 dBu 3 dBu 2 dBu 0 dBu 2 dBu MPA 1100 8 dBu 5 dBu 4 dBu 2 dBu 0 dBu 1 dBu 2 dBu MPX 300 1 dBu 2 dBu MPX 600 5 dBu 2 dBu 1 dBu 1 dBu 3 dBu MPX 1200 8 dBu 5 dBu 4 dBu 2 dBu 0 dBu 1 dBu 2 dBu Bridge Mode Limiter Settings for Power Levels into 8 ohms Power Amp 75 w 150 w 200 w 300 w 500 w 600 w 800 w 1200 w 2400 w ...

Страница 33: ...mp Request X O Dump Follows O O Program Request X O Program Follows O O SYSTEM COMMON X X SYSTEM REAL TIME X X AUX MESSAGES X X O Yes X No DSC 260 Midi Sysex Format The dump is sent as a series of system exclusive messages The first message is a request to overwrite the memory of the DSC260 Overwrite Memory Request System exclusive status F0H Sysex Message Starts Manufacturer ID 00H 20H 18H Basic ...

Страница 34: ...nnels DSC260 System follows 1CH Size of message 03H Number of bytes divided by 32 Program Number 00H Not used in this case Dump Data 96 bytes ddH End of System Exclusive F7H Programs must be sent with the highest program numbers first The DSC260 expects the last program to be program 0 the current program This is the data that is actually in use at the time and may not have been stored in one of t...

Страница 35: ...essage Starts Manufacturer ID 00H 20H 18H Basic Channel nnH 0 15 or 7FH for all channels DSC260 System follows 1CH Size of message 18H Number of bytes divided by 32 Program Number ppH Dump Data 426 778 bytes ddH Pairs of 4 bit nybbles LS first Size dependent upon EQ assignments End of System Exclusive F7H ...

Страница 36: ...t EQ4 Frequency Input EQ4 Input EQ4 Bandwidth Parameter Output 1 Output 2 Output 3 Output 4 Output 5 Output 6 Output Name Output Source Output Gain Output Limit Output Delay Output Delay Link Polarity Output Lo Shape Output Lo Frequency Output Hi Shape Output Hi Frequency Output EQ1 Type Output EQ1 Frequency Output EQ1 Output EQ1 Bandwidth Output EQ2 Type Output EQ2 Frequency Output EQ2 Output EQ2...

Страница 37: ...nput EQ4 Input EQ4 Bandwidth Parameter Output 1 Output 2 Output 3 Output 4 Output 5 Output 6 Output Name Output Source Output Gain Output Limit Output Delay Output Delay Link Polarity Output Lo Shape Output Lo Frequency Output Hi Shape Output Hi Frequency Output EQ1 Type Output EQ1 Frequency Output EQ1 Output EQ1 Bandwidth Output EQ2 Type Output EQ2 Frequency Output EQ2 Output EQ2 Bandwidth Output...

Страница 38: ...requency Input EQ4 Input EQ4 Bandwidth Parameter Output 1 Output 2 Output 3 Output 4 Output 5 Output 6 Output Name Output Source Output Gain Output Limit Output Delay Output Delay Link Polarity Output Lo Shape Output Lo Frequency Output Hi Shape Output Hi Frequency Output EQ1 Type Output EQ1 Frequency Output EQ1 Output EQ1 Bandwidth Output EQ2 Type Output EQ2 Frequency Output EQ2 Output EQ2 Bandwi...

Страница 39: ...DSC260 Preliminary Owners Manual Revision 0 9 35 ...

Страница 40: ...DSC260 Preliminary Owners Manual Revision 0 9 36 ...

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