Limpet manual - Linea Research Ltd.
Contents
1. LIMPET dsp OEM Installation amp Operation Guide Thank you Thank you for choosing this product for your application Please spare a little time to study the contents of this guide so that the best possible performance can be obtained from the unit Linea Research are always happy to answer any questions and can be contacted via www linea research co uk Primarily targeted at active loudspeakers Limpet is an ideal companion for Linea Research analog pod amplifiers adding Digital Signal Processing and BvNET networked monitoring and control The PC application that is used to control BvNET devices is called PodWare PodWare is an integral part of the system being used in OEM mode to factory configure the Limpet for its intended application and in User mode for either one to one or networked live control and monitoring Mechanical Installation Limpet should be mounted securely away from extreme sources of heat Linea Research are pleased to offer advice on optimal mounting positions and methods 138 0 128 0 Q o kikach made in the United Kingdom www linea research co uk LIMPE Tose 2 input 2 output networked amp monitored CUSTOMER MOUNTING POINTS 6 off 85 5mm 83 0 amp audio INA INTERFACE 2 CHANNEL B 8 AMPLIFIER e CHANNEL A AMPLIFIER t D g V2 T Q WS 2mm PH CONNECTORS contact Linea for2. ches would be used to determine which voice is selected If no connections are made to either of the two voice select terminals voice 1 will always be activated at power on The following table shows which voices are selected for given voice switch positions _ Voice Number _ Switch A Switch B Please remember that the control line for switch B has to be configured by the OEM to be either a voice change switch input or the wink LED If the wink LED is needed then it will only be possible for the user to select between two voices Currently Linea divides the four possible voices into two pairs One pair voices 1 amp 3 being referred to as Factory the other pair voices 2 amp 4 being User This means that the OEM can program Limpet with two sets of settings that will always be available and that the user cannot change With reference to the DSP processing block diagram above the parameters that can be set by the OEM for the factory modes are Input gain Input High Pass filter Input Low Pass filter Output Gain Output High Pass Filter Output Low Pass Filter 6 band Output Parametric EQ 2 band Output Shelving EQ Output Delay Output Limiter It is usual that the OEM will program these same default factory values in to the two user voices Users will then be able to use PodWare to modify these voices by adjustment of the following parameters Input gain Input High Pass filter Input Low Pass fi
3. details Connectors There are eight multi way connectors on Limpet These connect the device to up to two amplifiers up to two audio inputs temperature sensors load current monitors and a user interface circuit board All the connectors are of the readily available multi sourced 2mm pitch PH type Amplifiers The amplifier ports are designed to allow direct interfacing to Linea Research s analog pod products It may also be possible to use Limpet with other non Linea amplifier products Please contact Linea with any such enquiries Channel B Audio Input This is available on a 2 way connector situated next to the interface connector It is wired as follows DE1657 01a LIMPET user manual Page 1 of 6 Audio To ensure the highest audio quality 96kHZ sampling rate and 24 bit audio converters are used together with a powertul 3 generation Sharc Digital signal Processor DSP running audio processing algorithms borne from years of experience in high quality professional digital audio System levels have been configured to provide the lowest possible noise floor commensurate with good input signal handling capability Limpet has two balanced analog inputs and two analog outputs The DSP provides considerable processing possibilities and in addition it is possible to freely route either input chain to either or both output chains This makes a number of configurat
4. ed to Once settings editing is finished they will have been automatically stored in the Limpet if that Limpet was online when the changes were made The settings may also be saved into a factory file dfa This file can be used later in a number of ways e loaded into an offline panel in OEM mode for further editing e loaded into an online device in OEM mode for auditioning editing e loaded into an online device in User mode for factory configuration or field updates by means of File gt Open Factory Settings Should an OEM wish to change the settings of units in the field modified factory files can be distributed and loaded by the user without disturbing their user settings and without the user being able to access the OEM settings Bridging In OEM mode on a Limpet that has been configured for 2 way operation PodWare shows a bridge button in the Crossover Gain tab This may be activated to allow Limpet to drive two amplifiers in anti phase for bridge driving loudspeakers As there are generally some electrical details that need to be addressed when using amplifiers in bridge please contact Linea Research for further details User Connections The Limpet interface connector is intended to be used with a circuit board that provides the user interface This board would normally provide audio and BvNET connections as well as providing for LEDs voice switches and support circuitry Below are some details of the
5. good bad indication in user mode and a numerical measurement of impedance in Ohms in OEM mode OEM amp User Settings The Crossover Gain tab in the PodWare control panel allows the crossover and driver equalisation parameters to be adjusted Delay offsets between drivers can also be set here This tab also allows Limpet to be given a name to correspond with the model of speaker that it is fitted inside This name will be reported by PodWare when it discovers the device DSP Processing This is a block diagram of the DSP audio processing provided by Limpet Input A Output A Input B Output B User processing OEM processing DE1657 02 LIMPET user manual page 3 of 6 By having a clean split between OEM and user processing security is very simple because the user cannot access any of the parameters which are considered to be the responsibility of the OEM Only with the OEM password agreed with Linea can PodWare be unlocked to gain access to the OEM parameters Voices Limpet allows four complete sets of parameters to be stored Each set is called a VOICE Voices may be used for example to select an alternative tuning as may be required if a speaker is used with or without a separate sub bass unit Voice settings are stored permanently inside Limpet and so will always be available even if Limpet is not being used with PodWare The voice selected depends on the condition of two switch lines Normally two latching swit
6. ions possible especially if two amplifiers are employed The number of input channels shown in PodWare is determined by the firmware model issued by Linea Research which in turn follows the requirements of the OEM customer Gain amp headroom Limpet s maximum output signal level of about 5 5dBu has been set to provide a good match to the clip point of Linea s MiniPod amplifier products The maximum input level that can be applied to Limpet is higher than this at about 10dBu to allow easy system integration and the lowest overall noise performance to be achieved The input gain control s in PodWare would normally be set to OdB and should be considered a user control for reducing the sensitivity of the loudspeaker in a given installation situation The output gain control s would normally be used to adjust the relative drive levels between drivers in a two amplifier system The nominal output gain s would normally be set to OdB since this will achieve equal headroom between inputs and outputs However the Output gain s may be used to compensate for OEM equalisation or crossover filtering which causes the overall gain to be altered The Limiter s are calibrated with reference to the maximum output of Limpet A limiter threshold of OdB is thus the clip point of the amplifier The limiter s should be set so that they start to operate below a level which the driver s are known to survive The Limiter meters show the signal level on the input t
7. is within the limits set by the Min Imp and Max Imp controls on the Crossover Gain tab in PodWare when in OEM mode If any of these controls are set to off the lowest parameter value then impedance checking is disabled and the impedance indicators removed from the panel in PodWare for that sensor If currents are being monitored then it is possible for the DSP to apply audio limiters to try and keep the driver currents within OEM configured limits DE1657 02 LIMPET user manual page 2 of 6 The current sensing transformers are available from Linea already fitted to a small circuit board with all the appropriate connectors ready to be screwed inside an OEM speaker The individual components are also available should the OEM wish to incorporate the current monitoring as part of a passive crossover board Indicators Limpet can drive up to three LEDs What these LEDs indicate can be configured by the OEM to be either Limit channel A amp Limit channel B or Signal amp Limit with the limiter on either channel causing it to light The third Wink LED and the other LEDs except power flash for five seconds when the wink button on the device s PodWare panel is pressed If this LED is positioned on the front of a speaker it provides a useful way to easily locate a particular unit on a network As this LED shares a control line with VOICE switch B it is not possible to have both the wink LED and a
8. lso use voices 2 amp 4 The OEM settings determine the function of this line DSP amp PodWare As mentioned before PodWare is the PC application which is used to control Linea Research s products either one to one or networked using BvNET The abbreviated information here is intended to impart some basic information to allow customers to quickly start using their Limpets For a detailed description and operating guide for PodWare please contact Linea Branding It is possible for OEM customers to apply branding to both their versions of the PodWare PC control application and also the control panels that PodWare displays when connected to an OEM s product Amongst other things it is possible to have a customised splash screen customise fonts and to choose the colours of control panels and controls etc This choice of appearance will always be used when an OEM s product is discovered on a BvNET network even if it was discovered from a differently branded version of PodWare should the OEM have allowed this Monitoring PodWare allows the following Limpet parameters to be continuously monitored and displayed Input level meter Limiter meters Amplifier protect indicator Internal Limpet temperature meter External temperature sensor meter s Driver impedance indicator s Amplifier clip indicator Temperature logging all three sensors Amplifier protection logging Power cycle count Driver impedance is displayed as a
9. lter Input Delay 8 band Input Parametric EQ 2 band Input shelving EQ Please note that in order to protect drivers the user will only be able to adjust the high pass filter if the OEM allows this in the OEM settings With PodWare in user mode adjustments are made simultaneously to voices 3 amp 4 Authoring Voices The OEM password must be entered for it to be possible to edit the settings for the factory voices 1 amp 3 Since normally most of the parameters will be similar in every voice because they pertain to the drivers and cabinet etc it is possible to save time by entering the parameters with the voice selector in the PodWare panel set to all this will simultaneously apply any changes made to all four voices DE1657 02 LIMPET user manual page 4 of 6 Once satisfied with the general settings the required differences between the voices can then be made by selecting that particular voice and making the changes When working online either in OEM or user mode be aware that the setting of the voice switches on the device itself will still affect the voice which is heard PodWare can be editing an entirely different voice Make sure that the same voice is selected on both the product and PodWare if it is desired to hear the results of the changes to avoid confusion The voice group box in PodWare has an active voice indicator which shows the voice the product has been set to i e which voice is currently being listen
10. nction of these LEDs is determined by LIMIT LED red the DSP and can be changed DE1657 02 LIMPET user manual page 5 of 6 Technical Specifications Audio Input impedance Output Impedance Maximum Input level Maximum Output level Converters Sample rate Frequency Response Dynamic range THD 20Hz 20kHz Environmental Temperature Humidity Power consumption Dimensions Height Width Depth Weight Regulatory compliance 11k Ohms balanced 5 5k Ohms unbalanced lt 50 Ohms impedance balanced 10dBu 5 5dBu 24 Bit 96kHz 10Hz 40kKHz 1dB 20Hz 20kHz 0 5dB 110dBA better than 0 01 O to 55 C 0 to 80 RH non condensing 4W max 24mm 83mm 138mm 300g This product complies with the EMC Directive 89 336 EEC as issued by the Commission of the European Community Compliance with these directives imply conformity with the following European standards e EN55103 1 e EN55103 2 Electromagnetic Interference Emission Electromagnetic Susceptibility Immunity This product is intended for operation in the E2 commercial amp light industrial and E3 urban outdoors Electromagnetic Environments DE1657 02 LIMPET user manual page 6 of 6
11. o the limiter referenced to the limiter threshold A reading above OdB the red section on the meter thus indicates the amount of limiting Monitoring Temperatures Limpet contains a temperature sensor internally which is always shown on the PodWare panel In addition up to two further external temperature sensors may be attached which could for example be used to monitor the temperature of an amplifier and speaker driver If temperatures are being monitored then it is possible for the DSP to apply audio limiters to try and keep the temperature within an OEM configured limit The OEM settings determine whether either or both of these sensors are enabled if so a temperature bar graph and a temperature log will be displayed for that sensor in PodWare To change the setting with PodWare in OEM mode two tick boxes will be found in the Crossover Gain tab Ticking one of the boxes will hide exclude the relevant temperature gauge Limpet is designed to be used with National Semiconductor LM35 temperature sensors Linea can supply these parts ready fitted to a Limpet compatible wire loom If the OEM wishes to manufacture their own cables the connections are as follows LM35 Function Driver Ilmpedances Like the external temperature sensors up to two external current transformers may be attached to a Limpet which will then be able to monitor the impedance of the connected driver s PodWare is then able to check that the driver impedance
12. standard single audio input interface circuit board offered by Linea Research Linea are always happy to advise OEMs on different arrangements 88 00 Notes p i As standard the POWER SIGNAL amp LIMIT LEDs can be any combination of 5mm To red green or blue types on 100mm leads The MODE switch s can be on either 100mm or 250mm leads Other colours switch types amp lead lengths are possible subject to a minimum order quantity 45 50 The WINK LED would normally be supplied by the customer as it is generally fitted to the front of the cabinet A type that can give the desired brightness with about 1 15mA of drive should be selected It is not possible to have both the WINK LED amp the second DSP VOICE switch J 94 25 The audio amp BVNET connectors use standard Neutrik A series cutouts amp should be secured with 2 9x8 pan head plastite screws The Limpet is connected with either a 150mm 300mm or 450mm long wire loom supplied by Linea LOCATE LED eS sae AUDIO AUDIO BvNET BvNET IN LINK N LINK 00 N 23 00 23 00 23 oi g gt 2 way 0 1 MOLEX KK l P g STYLE HOUSING O O 3 r4 19 80 To cN7 1 Co 2 K co Standard Linea switch amp panel cut out 2 3 i Pe eee 2 se ii _ 5 10 DSP VOICE switch A TO Limpet S _ POWER LED blue SS SIGNAL LED green Shown is the standard LED E configuration The fu
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