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logic system E t h o s C A M a n u a l

R 5 - ( 1 7 / 0 4 / 0 8 )

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Contents:

• 1) Introduction o 1.1) Ethos CA20 o 1.2) Ethos CA10 o 1.3) Ethos Nd215 o 1.4) Ethos Nd218

• 2) Cabinet Connection • 3) System Configurations

o 3.1) Pole Mount o 3.2) Ground Stack o 3.3) Flown Array

• 4) Installing Ethos CA • 5) Acoustic Setup • 6) Array Prediction • 7) Ethos VA Integration • 8) Transit protection

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1) Introduction: An Ethos CA system can be composed of a combination of four enclosures, two of which are ultra compact fixed angle array boxes, one of which is a bass enclosure and one a sub-bass enclosure. Details on these cabinets and their application are as follows: 1.1) Ethos CA20 Ethos CA20 is an ultra compact fixed angle array enclosure that offers 90° horizontal directivity and 20° vertical directivity. Each box features four connection ports that enable boxes to be quickly and easily linked together. Details of this are shown later in this manual. The cabinet is truly multipurpose and can be used in a variety of ways:

• As a standalone pole-mounted cabinet courtesy of the integrated variable angle top hat mount. This feature allows +/- 18° of adjustment.

• Linked to a second cabinet and again pole mounted. The weight testing on the top hat only allows two cabinets to be used in this way.

• Groundstacked above an Ethos Nd215. In this mode the ground stack assembly allows the bottom box to be angled down in 5° increments up to a maximum of 20°.

• Flown in an array from the Ethos CA flyframe. • Flown in an array with an Ethos Nd215 cabinet above.

All these options are covered in further detail later in the manual. 1.2) Ethos CA10 The Ethos CA10 is a version of the cabinet with 10° vertical coverage. It shares all the same functionality as the Ethos CA20 and can either be used with other Ethos CA10 cabinets or combined with standard Ethos CA20 enclosures. As an example you might use CA10 cabinets at the top of an array to extend the system throw with an under hang of CA20 below. 1.3) Ethos Nd215 Ethos Nd215 is a compact 2 x 15” bass cabinet which has eight connection ports integrated into its design. This enables the cabinet to be linked directly to Ethos CA cabinets or linked via the Ethos CA fly frame. Possible combinations are:

• The cabinet can be used mounted landscape or portrait with Ethos CA pole mounted above.

• With an Ethos CA flyframe and ground stack assembly connected the Nd215 can be used as the basis of an Ethos CA groundstack. One or two cabinets can be utilised in this mode.

• The Ethos Nd215 can be flown above Ethos CA cabinets in a flown array.

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1.4) Ethos Nd218 Ethos Nd218 is a compact 2 x 18” sub bass enclosure. On larger Ethos CA systems when sub bass reinforcement is required the Ethos Nd218 can be added to a system. The cabinet is intended purely for ground stacking and as a consequence does not have any connection ports. When stacked in landscape mode the Nd215 can be stacked above the Nd218. 2) Cabinet Connection Both Ethos CA10 and CA20 enclosures are supplied with the following fly ware:

• 2 off link bars • 2 pairs of lanyard linked Ball Lok pins.

The Ethos ND215 is supplied with the following parts:

• 4 off link bars • 4 pairs of lanyard linked Ball Lok pins.

To link cabinets simply fit the link bar into the connection port and secure with a Ball Lok pin. Mate the second cabinet and again secure with a pin.

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3) System Configurations 3.1) Pole Mount Ethos CA can either be pole mounted in isolation or linked in a pair. The left image below shows a pair mounted above an Ethos Nd215. This configuration would give 90° horizontal coverage combined with 40° vertical coverage. By adjusting the variable angle top hat the vertical focus of the cabinets can be adjusted. When a single cabinet is being used a smaller bass cabinet such as a Logic System B1 could be used in place of the Nd215. Either the CA10 or the CA20 can be used in this configuration. A pair of CA10 enclosures, as shown in the image below right, would give a tighter 20° vertical coverage. As a further option a CA10 and CA20 could be combined to give 30° vertical coverage.

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3.2) Groundstack To groundstack Ethos CA10 or CA20 you need:

• An Ethos Nd215 • An Ethos CA fly frame • An Ethos CA Groundstack assembly.

The image below details how these are combined. The frame can be attached to the Nd215 in one of two positions, either aligned to the front or as shown below to the rear. This feature is to enable you to compensate for the centre of gravity of the mounted array. Up to eight boxes can be ground stacked in this way and they can either be the CA10, the CA20 or a combination of the two. The application for groundstacking is within the theatre environment when you might not have the ability to fly, but wish to cover from the stalls up to a balcony. Groundstacking enables you to provide coherent coverage combined with simple and quick set up.

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Two Ethos Nd215 ground stacked with Ethos CA10

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A further groundstack option is provided by using the lock down bar provided with the flyframe. This enables the frame to be connected directly to the M20 plate fitted to the Nd215 and also Nd315 enclosures. This facility is only intended to be used for groundstacking and must not under any circumstances be used for flying.

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All of the systems detailed above use the groundstack assembly connected to the flyframe to achieve downwards kelp. The following diagrams detail the available angle selections, which range from 0° up to 20° of downwards kelp.

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3.3) Flown Array Ethos CA10 and CA20 can be flown either directly from the Ethos CA flyframe or with an Ethos Nd215 flown above them. The image below shows them in this configuration. Assembling a flown array is a simple task. When flying Ethos CA10 or CA20 without the Nd215 the array can be clipped together on the ground and then simply pulled into the air. When an Nd215 is being flown above it is generally easier to connect the motor to the frame and pull the Nd215 off the ground. Then simply add cabinets one by one underneath the Nd215. Arrays can be composed of the CA10 cabinet, the CA20 or a combination of the two. The Ethos CA flyframe has a weight testing that exceeds the amount of cabinets that could be practically used. It is imagined that six Ethos CA10 cabinets would be the largest practical system.

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A further option when flying Ethos CA is to insert an additional frame and groundstack assembly under the Nd215. This will allow the top box in the array to be kelped up by 20° a novel feature when you are not able to fly as high as would be required.

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4) Installing Ethos CA Ethos CA is also available as a specific installation product, namely the CA10i or CA20i. While the cabinet is identical to the touring version the connection method is not. While the touring product uses link bars and ball lok pins to enable quick and rapid connection the installation version is supplied with a simple link bar that bolts to the cabinet using existing insert points. The installation link bar will allow connection of CA10i, CA20i and Nd215, but will not allow connection to the Ethos CA flyframe. Hole spacing’s and size only permit connection via the touring link bar and ball lok pin. In a situation where CA needs to be connected directly to the flyframe a standard touring version must be used as the top box, subsequent boxes may be CAi variants.

5) Acoustic Setup Both Ethos CA10 and CA20 are passive enclosures, but are designed to be used with the Logic System DP2140 to provide system control. The DP2140 has a number of preloaded presets to run the system. Ethos CA is like any other array in that the first task is to arrive at a HF to midrange balance. As the 8” mid/bass driver is direct radiating its SPL level will be directly related to two factors, firstly the amount of cabinets that are linked together in an array and secondly the environment in which the cabinet is being used. In all Ethos CA presets the HF drive level is set at its maximum permissible drive level with a shelf being used to control

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the midrange energy. Taking point one above first a single enclosure would require a 6dB lift in midrange energy to balance with the HF. Adding a second box will add 6dB to the midrange energy and as a consequence the shelf will be set to flat. Above two boxes the environment becomes a major issue on the midrange. For example outside the cabinet is radiating into a 360° sphere, but when you come inside you now have walls and a floor and ceilings cutting down the quadrants into which the 8” driver is radiating. This can have a significant effect on the efficiency of the driver. Current Ethos CA presets have the following parameters:

1. CA20 FR1 - One CA20 cabinet pole mounted used in a fullrange mode for vocal applications.

2. CA20 FR2 – Two CA20 cabinet pole mounted used in a fullrange mode for vocal applications.

3. CA10 FR2 - Two CA10 cabinet pole mounted used in a fullrange mode for vocal applications.

4. CA20 PS1 – One CA20 pole mounted on an Nd215. 5. CA20 PS2 – Two CA20 pole mounted on an Nd215. 6. CA10 PS2 – Two CA10 pole mounted on an Nd215. 7. CA10 GS3 – Three CA10 ground stacked on a pair of Nd215. 8. CA FA4 – A flown array of either four CA10 or CA20 cabinets. 9. CA 4 Way – A mono patch which would be used if a flown

array of CA with overhung Nd215, also required ground based Nd218.

The presets above all offer the same basis EQ settings for the CA enclosure, but have variations in bass levels, midrange drive level and time alignment to optimise the system configurations. Additional adjustments to midrange drive level may be necessary from venue to venue and these can be achieved by using the 12dB/Oct low shelf on the CA output channel. This can either be adjusted on the front panel or via the podware control software. The operation of this filter is very linear meaning that obtaining a balance is a simple task. Beyond system balance there is no further black art to setting up Ethos CA. 6) Array Prediction We are at this time having EASE data prepared to enable both Ethos CA10 and Ethos CA20 to be integrated into our EASE Focus aiming software. This will enable any environment to be modelled for coverage and SPL level. 7) Ethos VA Integration Ethos CA has applications as a stage fill or as a side hang for the larger Ethos VA system. One word of warning is that as Ethos VA runs its HF out of phase it may be necessary to invert the phase of the CA enclosure to avoid phase cancellations. This can be quickly

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and easily done on the DP2140. The Ethos VA flyframe has channels that permit the Ethos CA to be mounted to it, this permits Ethos CA to be ground stacked above either Ethos B2 or Nd315 cabinets or flown below, although this does require a second frame inserted between bass enclosure and array. 8) Transit protection Logic System offers three options that help to protect your investment during transit. These are:

1. A padded cover which accommodates either the CA10 or CA20 enclosure. The cover features an opening flap at one end which is secured by Velcro when closed.

2. The CA2 case is a simple trunk flightcase constructed from a heavy duty diamond finish board. The case has two foam lined compartments that accept either CA10 or CA20 cabinets. The lid is on stay back struts and the case features four flip handles. The case is not supplied with castors.

3. The CA4 case is detailed below. The base of the case has four compartments to accept either CA10 or CA20 while the central slot will accommodate a fly frame. The case also features a lift out tray which will take an additional frame, ground stack assemblies and link bars and pins. The case features ten flip handles and heavy duty castors.

Chris Scott – Logic System Rev: 5 (17/04/08)