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C

INPUT

C.5

Parametric Equalisation

its order as the filter becomes progressively steeper rather than following a linear slope so a
dB/octave description is not accurate.

C.5

Parametric Equalisation

There are eight stages of equalisations available for each input channel, two shelving filters
and six parametric filters.

C.6

FIR Shelving EQ

A

FIR/

Preset

1

Freq

100Hz

Gain

0.0dB

The Input High Shelf EQ is implemented using a Finite Impulse Response (FIR) filter, and

exhibits a linear phase response; that is all frequencies are delayed by the same amount. This
can be important in applications where different amounts of EQ are applied to different parts of
a speaker cluster, such as to add ’Throw’ EQ boost so that parts of cluster which are throwing
further can have HF absorption correction added. If this EQ is not linear phase, then the zones
where the speakers combine may suffer frequency response anomalies. Being a linear phase
FIR equaliser, this necessarily introduces some latency delay, which is constant regardless of
the settings. However, when the frequency is set to maximum (Off), it is removed from the
signal path entirely, so it does not add any latency. Using encoder

A

will change the frequency

parameter from 2kHz to 20kHz and using encoder

C

will change the cut or boost in 0.2dB

increments. The filter (and its associated latency) can be completely removed by setting the
frequency parameter to the maximum off position.

Also see Latency Delays on page 25.

C.7

Parametric Filters

A

EQ1

Preset

1

Freq

100Hz

Width

1.0oct

Gain

0.0dB

Parametric filters are defined by frequency, bandwidth and gain. The frequency is controlled

by encoder

A

and ranges from 10Hz to 25.6kHz. The bandwidth, shown as Width on the

screen, is controlled by encoder

B

and ranges from 0.10 octaves to 5.2 octaves. Bandwidth

can be shown and adjusted as Q or Octaves (Oct). Gain is controlled by encoder C and is
available in 0.2dB increments.

Also see Bandwidth Units on page 23.

C.8

Routing

A ROUT

Preset

1

Source

Analog

AES3

0.0dB

Net

0.0dB

User Manual DMS48

V1.1

19

Summary of Contents for DMS48

Page 1: ...User Manual Digital Processor DMS48...

Page 2: ......

Page 3: ...lip mute Indicator 12 A 1 4 Graphical Display 12 A 1 5 Status Indicators 12 A 1 6 Parameter Encoders 12 A 1 7 AES3 Active Indicators 12 A 1 8 Mute Buttons 12 A 1 9 Limiter Indicators 13 A 1 10 Selecti...

Page 4: ...rs 21 D 7 1 Vx Limiter 21 D 7 2 Tmax Thermal Limiter 22 D 7 3 Xmax Excursion Limiter 22 D 7 4 Amplifier Gain 22 D 8 Routing 22 E Utility Pages 22 E 1 Screen Contrast 22 E 2 Stereo Linking 22 E 3 Curre...

Page 5: ...us from the ac mains disconnect the power supply cord plug from the AC receptacle The mains plug of the power supply cord must remain readily accessible 1 Read these instructions 2 Keep these instruct...

Page 6: ...th a fuse of the same type Installation instructions 1 This product must be earthed Use only a flexible cable or cord provided with a green or green and yellow core which must be connected to the prot...

Page 7: ...technician for help FCC Caution Any changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate this equipment This equipment has...

Page 8: ...need for a router or a switch Class leading sonic performance achieved by the use of state of the art converters a 4th Generation Analogue Devices Sharc DSP and highly advanced DSP algorithms Powerful...

Page 9: ...ng The DMS48 also includes a new type of crossover filtering Linea Impulse Response LIR crossover filtering which gives a Linear Phase crossover that has a constant delay regardless of frequency unlik...

Page 10: ...5 FIR Linear Phase Equalisation 3 INTRODUCTION AND KEY FEATURES this EQ is not linear phase then the zones where the speakers combine may suffer frequency response anomalies User Manual DMS48 V1 1 10...

Page 11: ...articular input socket or input DSP channel Pressing IN or OUT buttons repeatedly will scroll through the inputs outputs of the processor After the last channel navigation returns to the default scree...

Page 12: ...indicator shows when there are parameters active on a group layer which the user cannot access through the front panel of the device The NETAUDIO indicator shows that a networked digital audio card i...

Page 13: ...uced The T indicator illuminates when the limiter is in at least 1dB of limit A 1 10 Selection Indicators Each page that is visited when navigating will usually show either one two or three parameters...

Page 14: ...ains electricity supply using an earthed IEC C14 connection power lead The processor has a switch mode power supply that is capable of operating with a nominal mains voltage of 85V to 240V 50 60Hz wit...

Page 15: ...ive module with input DSP B forming the master control and output DSP 3 and 4 providing the driver related control Overall this forms the control typically for one loudspeaker sub system The Input DSP...

Page 16: ...an encoder clockwise will increase the value of a parameter or anticlockwise will decrease it The encoders are velocity sensitive so turning an encoder rapidly will cause the action to accelerate so...

Page 17: ...displayed ENT to confirm or H to exit pressing ENT will store the preset B 6 Recalling Presets A RECL Preset1 Preset 23 Name Preset2 To recall a preset press the IN button then using the down H butto...

Page 18: ...he correct sample rate from the incoming stream For other details on the operation of the Digital Audio Network please refer to the relevant documentation C 2 Gain and Polarity A GAIN Preset1 Gain 0 0...

Page 19: ...near phase FIR equaliser this necessarily introduces some latency delay which is constant regardless of the settings However when the frequency is set to maximum Off it is removed from the signal path...

Page 20: ...Gain and Polarity A GAIN Preset1 Gain 0 0dB Pol Norm Mute Norm The gain page of the output channel allows users to increase or decrease the relative signal gain for the selected output Using encoder...

Page 21: ...helving filters and eight parametric filters Parametric filters are defined by frequency bandwidth and gain The frequency is controlled by encoder A and ranges from 10Hz to 25 6kHz The bandwidth shown...

Page 22: ...rated by APG and cannot be modified Also see Amplifier Gain on the current page D 7 4 Amplifier Gain Expressed in dB this is the gain of the amplifier which the output of the DMS48 is feeding This val...

Page 23: ...lows the Static Ethernet IP address to be adjusted by the three rotary encoders the the IP Static page of the UTIL menu This will only have effect when in Static mode E 6 Store Snapshot This page of t...

Page 24: ...e its Online Indicator will be flashing It can take one minute before it will be able to connect while is acquires an Auto IP address F 4 Static IP If the device or the computer has a static IP addres...

Page 25: ...ecall Snapshot 2 The above allows the AUX Port to be used either in Event mode whereby a momentary push button or momentary relay contact closure on one of the AUX lines will cause a Snapshot to be re...

Page 26: ...yed in UTILS pages see Latency display on page 23 H 1 Audio Network outputs When the Digital Audio Network option e g Dante is fitted the eight audio outputs are sup plied to eight channels on the Aud...

Page 27: ...118dBa Typ THD 20Hz 20kHz 0 008 Typ Mains required 85 230VAC 50 60Hz Mains power 30W I 1 Connectors Audio input 3 pin female XLR Audio output 3 pin male XLR Ethernet Shielded RJ45 Aux Contact Phoenix...

Page 28: ...te Delay Low Shelf EQ High Shelf EQ 8 th Order LPF 8 th Order HPF Limiter Gain Meter Mute Delay Gain Meter Low Shelf EQ Gain Meter Low Shelf EQ Analog In 2 6 Band Para EQ 6 Band Para EQ Delay 4 th Ord...

Page 29: ......

Page 30: ......

Page 31: ......

Page 32: ...APG France 19 Bis Rue des Ecoles Site Valnor ZI Haute 95500 Le Thillay RCS Pontoise 451935084 Tel 33 0 1 30 18 92 70 Fax 33 0 1 30 18 92 71 E mail contact apg tm fr Site www apg audio com...

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