User manual MARTIN AUDIO AM10 SCHEMATICS

[. . . ] The unit is supplied with the 0V electronic reference ground taken to the case via an internal `signal ground' lead and space receptacle, which inserts a ground lift resistor when in the `Earth Off' position. To connect the 0V electronic reference direct to the chassis ground, use a pair of pliers to pull off the space receptacle from the `Earth Off' position and push it onto the 0V spade terminal (marked Earth On, on the PCB). This equipment must be earthed. ! CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN DO NOT EXPOSE TO RAIN OR MOISTURE It should not be necessary to remove any protective earth or signal cable shield connections. 3 Martin Audio ­ AM10 System Controller ENGLISH CONTENTS < 4 4. 1 > PRINT GUIDES CONNECTIONS Input Connections AM10 inputs are on female XLR type connectors and are electronically balanced. Pin 1 is normally open circuit but may be linked to sig 0V or chassis earth by inserting a link on the PCB (see Fig 1). [. . . ] To eliminate ground current loops, it can be lifted at the AM10 output, provided normal safety requirements have been met (i. e. the mains earths are correctly connected). See Fig 3. Signal Grounded Shield AM10 Output 1 3 2 Amplifier Input 2 3 1 AM10 Output Chassis Grounded Shield Amplifier Input 1 3 2 2 3 1 Fig. 3 5 INITIAL SETTINGS AM10 units are supplied with the adjustments set as follows: Mains Voltage Ground Switch Limiter Threshold Plug-in Board 240V ON 2V setting System specific 6 AM10 SYSTEM CONFIGURATIONS WITH PLUG-IN BOARDS The AM10 used in conjunction with a plug-in board becomes a dedicated system controller. Depending on the plug-in system-specific board, the AM10 is automatically configured either as a stereo 2-way or mono 3-way device for a specific Wavefront system. Each plug-in board dictates a system-specific crossover function, equalisation and in some cases group delay. 6 Martin Audio ­ AM10 System Controller ENGLISH CONTENTS < > PRINT GUIDES Mounted on each plug-in board are jumper links. The links determine various low frequency equalisation (LF EQ) options. They are set by the user according to the application of the system. The various options concerning LF EQ are outlined in the following. These should be examined carefully, especially when using sub-bass in a system. 6. 1 AM10 / W2 - Active W2 Configuration (Stereo) The AM10W2LF board is used to control the W2 when operated as an active 2-way system (see Fig 4). W1, W2 or W3 Passive operation with Sub Bass using AM10SF Card 6. 6 Mono Sub Bass J9 on the AM10SF Card can be used to mono sum channels 1 and 3. 6. 7 Active W2/W3 with Sub Bass Operation Using AM10W2LF Card or AM10W3LF Card (Stereo) An additional controller fitted with a AM10SF card may be used to drive a sub-bass system to augment stereo W2 and W3 systems and their controllers (see Fig 9). W3 ACTIVE W2 ACTIVE W3 ACTIVE W2 ACTIVE WS2A LF (EQ Defeat) MF/HF LF (EQ Defeat) MF/HF AM10W2LF Card or AM10W3LF Card WS2A SUB W2 or W3 (Limiter Cancel) SUB W2 or W3 (Limiter Cancel) AM10SF Card LEFT INPUT RIGHT INPUT Fig 9. Normal operation for augmenting Stereo W2/W3 Active with Sub Bass In this set-up, the LF EQ of the AM10W2LF or AM10W3LF cards on Bands 1 & 3 should be switched out. This is achieved by moving jumper links J1 ­ J2 on the card from the IN position to the OUT position (see Fig 9A) IN IN OUT OUT Fig 9A. J1 J2 J1 J2 L . EQ 10 Martin Audio ­ AM10 System Controller ENGLISH CONTENTS < > PRINT GUIDES The limiters on the high-pass outputs of the AM10 driving the W2's or W3's should also be defeated to prevent them operating in advance of following units. To defeat the limiters on Bands 2 & 4, move jumper links J2 and J4 on the main circuit board to the left position. Please refer to Section on limiters for further information. The AM10SF is normally operated in 100Hz high-pass/crossover mode (2) (see Section 6. 3) for this configuration, although it may be operated in overlap mode (3) if overlap is required for flown systems. Full-range mode (1) should only be used with care, in special cases where distant flown systems are required to run full-range. Some cancellation may occur if the W3/W2 are used in close proximity to the sub-bass enclosure. However, this cancellation may be resolved by simply reversing the phase of the W2 or W3. [. . . ] They are: 0 1 0. 2 0. 4 2 3 0. 5 0. 7 4 5 0. 9 1. 1 6 1. 3 7 8 9 A 1. 4 1. 6 1. 8 2. 0 B 2. 2 C 2. 3 D 2. 5 E F 2. 7 2. 9 If operated by inexperienced personnel or in situations where abuse is likely, limiter switches can be backed off 2 or 3 positions to lower `safe' thresholds. This will ensure that the output of the amplifiers cannot exceed the long-term continuous power ratings of the drive units. Each limiter may be defeated if required by moving jumper links J1-J4 on the main circuit board to the left position. JUMPER BAND 1 BAND 2 BAND 3 BAND 4 J1 J2 J3 J4 POSITION RIGHT LEFT RIGHT LEFT RIGHT LEFT RIGHT LEFT LIMITER ON OFF ON OFF ON OFF ON OFF IMPORTANT NOTE If another AM10 is to be driven from any of the outputs - for instance when a AM10SF provides the high-pass outputs for a AM10 configured for an active W2 or W3 - the limiters should be defeated on those outputs to prevent them from operating in advance of the limiters in the following units (see Fig 9). 9 WARRANTY Martin Audio AM10 System Controllers are warranted against manufacturing defects in materials or craftsmanship over a period of 1 year from the date of original purchase. [. . . ]