ACM120XL, 120 Watt Mixer Amplifier
Product Description
The ACM120XL is a 120 watt mixer amplifier designed for commercial installations. It features 8 microphone/line input channels and can be ud for either low impedance (4 or 8 ohm) or 70v/100v line speaker systems. A host of unique features including multiple levels of muting, a VOX relay output and VCA master level control make the ACM120XL a very flexible amplifier. The unit can be mounted in a standard 19” equipment rack (rack ears supplied) or it can be ud on a shelf or table.
Front Panel Features
Microphone/Line Level Controls
The level controls for the 8 inputs are labeled Ch 1-Ch 8. The level controls are ud to t up a suitable “mix” of all the various input sources connected to the ACM120XL. For example, microphon
es, CD players, castte decks etc. Once a suitable mix of all inputs has been t up, the overall level can then be adjusted by the “Master” level control on the far right of the ACM120XL front panel.
Bass Control
The Bass control is part of a 3-band equalization system within the ACM120XL. The Bass control allows the ur to increa or decrea the amount of bass in the system. The control allows for 12dB of cut or boost at 100Hz. If no bass cut or boost is required, the control should be left in the center (0) position.
Middle Control
The Mid control is part of a 3 band equalization system within the ACM120XL. The Mid control allows the ur to increa or decrea the amount of mids in the system. The control allows for 10dB of cut or boost at 600Hz. Depending on the speakers and application, a small cut (decrea) in the mids normally makes the system sound ‘warmer’. If no mid cut or boost is required, the control should be left in the center (0) position.
Treble Control
The Treble control is part of a 3 band equalization system within the ACM120XL. The Treble control allows the ur to increa or decrea the amount of treble in the system. The control allows for 10dB of cut or boost at 10kHz. Generally, a small increa of the treble control makes a system sound ‘brighter’. If no treble cut or boost is required, the control should be left in the center (0) position.
Master Control
The master control ts the overall output level of the ACM120XL. It is ud in conjunction with the input level controls. When tting up levels, plea ensure that proper gain structure practices are followed. In other words, it is not advisable to run the input channels at 10 and the output level at 1. Instead, aim to keep all of the input controls and the master control at around the same level.
Power Switch and “On” LED
The black rocker switch on the right hand side of the front panel is ud to switch the amplifier on and off. The ‘up’position is on. When the amplifier is connected to an appropriate AC power source and is switched on, the blue LED will illuminate.
Signal LED
The green “Signal” LED located next to the On LED indicates that the ACM120XL is passing audio. The signal LED is a simple method to trouble-shoot installations especially in multi-amplifier projects.
Rack Mounting
The ACM120XL is supplied with rack ears attached to allow mounting within a standard 19” equipment rack. As is the ca with almost all audio products, adequate ventilation and air flow is required. When installing multiple ACM amplifiers within the one rack, it is recommended that at least 1 rack unit of ventilation space is left between every two amplifiers.
For table or shelf mounting, the rack ears can be removed using a screwdriver. Once the rack ears are removed, plea reinstall the screws.
Rear Panel Features
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230V/240V Slide Switch
The operating voltage of the amplifier is ur lectable between 230V and 240V via a slide switch located on the top left side of the rear panel. This switch should be t to match the AC voltage of your country.
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全国助残日AC Power Inlet
The 3 pin IEC power inlet is located on the bottom left of the rear panel and accepts a standard mains power lead fitted with an IEC connector. Before plugging in a power lead, plea check the rear panel of the amplifier to ensure that the voltage label shows the correct AC operating voltage for your part of the world. The inlet is equipped with an in-built AC fu holder fitted with a 4 Amp slow blow fu plus a spare fu. Power consumption is 250 watts (max).
---Plea ensure that the mains power cord is disconnected before attempting to check or replace this fu.---
Speaker Output Terminal Strip
Located on the top left of the rear panel is the speaker output terminal strip. Reading from left to right,
the connections are:
COM Common or “-” for low impedance speaker loads (4 or 8 ohms).
4Positive “+” for 4 ohm speaker loads (u with common)
8Positive “+” for 8 ohm speaker loads (u with common)
COM Common or “-” for 70v or 100v speaker loads (maximum load of 80 ohms at 100v)
70Positive “+” for 70v line speaker loads (u with common)
100Positive “+” for 100v line speaker loads (u with common)
Plea ensure that the correct “Common” is ud. Low impedance and 70/100v loads can be ud simultaneously but plea pay careful attention to the overall speaker load. When ud individually, the low impedance load should be 4 ohms or higher while the 100v line load should not fall below 80 ohms. When both outputs are ud simultaneously, ensure that neither output is loaded to maximum.
VOX Relay Output
The terminal strip to the immediate right of the AC inlet features a relay output. This relay is activated when signal is prent on any of the priority inputs. This would normally be inputs 1, 2 and 3 however some or all of the channels can be removed from the priority bus via internal links (e “Muting” further on in this manual). The unit is shipped from the factory with inputs 1, 2 and 3 having priority so assuming that this has not been changed, then signal from any of the inputs will activate the VOX relay circuit.
The relay outputs are C (Common), NO (Normally Open) and NC (Normally Clod). The NO or NC lection provides the installer with the option of the relay either opening or closing a contact. This feature is normally ud in conjunction with relay override attenuators (volume controls). In this application, the relay output could trigger a power supply which in turn bypass the remote attenuators. The result is that priority inputs will always be heard irrespective of the attenuator tting. The relay contacts are 0.5 amps at 100V AC.
儿童节的诗句VCA Control
An external pot (500 ohm to 1K) can be connected to the ACM120XL for remote control of the maste
r level. While a 1K pot can ud, better results (smoother volume adjustment) can be obtained by using a 500 ohm pot. The external pot is governed by the master level of the amplifier allowing the installer to t the volume, then lock the amplifier in a rack leaving the ur with just a master volume control that cannot go beyond the level t on the master (front panel) control. Connection is via a 2 wire terminal strip on the rear panel of the amplifier.
Tone Generator
The ACM120XL includes a 4 tone generator module featuring Alert, Evacuate,Pre-Announce and Bell tones. All 4 tones can be activated individually using the rear panel terminal strip. Shorting “Common” to the relevant tone name will activate that particular tone.
The volume level of the tone is t via an internal pot (R63) which is located to the far right (when looking from the front) of the front mixer PCB. The pot is labelled R63 and ts the level of all 4 tones. Plea note that the level of the tones is not affected by the “Master” control on the front panel.除湿机哪个好
When any of the 4 tones are activated, inputs 4 to 8 are muted. Inputs 1, 2 and 3 on the other hand will mix with the tones and can be ud at the same time.
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Inrt Point
The ACM120XL includes an Inrt Point to allow for connection of signal processors such as equalirs, compressors or Feedback Exterminators. The Inrt Point is located (electronically) between the mixer and power amplifier ctions of the ACM120XL. It allows for the “mixed” output of the ACM120XL to be procesd externally and then returned to the power amplifier ction of the ACM120XL.
The Inrt Point is a 3 conductor (Tip, Ring, Sleeve) socket which accepts a standard stereo 6.35mm (1/4”) jack. The one jack allows for signals to be “nt” to the processor and then “returned” to the power amplifier. The connections are: Tip Amplifier in. This is the return signal from the processor
Ring Mix Output. This is the signal from the mixer stage which is to be nt to the processor
Sleeve This is the ground connection
When an external processor is ud via the inrt point, it only affects the power amplifier ction of the ACM120XL. The tape output remains unprocesd.
Tape Output
The ACM120XL includes a tape recorder output with dual RCA connectors. Although the output signal is mono, dual RCA’s are provided to allow for easy connection to domestic or professional tape recorders.
The output level of the tape output is governed by the 8 input controls of the ACM120XL. The front panel master control does not affect the tape output. In a practical situation, this allows for “on the fly” changes to the power amplifier level (to turn the PA system up or down) without affecting the signal being recorded.
Line Output
A 3 pin male XLR socket is provided to allow for connection to additional power amplifiers. The line level signal is the mixer output of the ACM120XL allowing this “mixed” signal to be split to other amplifiers. This is most commonly ud when more power (than the 120 watts of the ACM120XL) is required. In this situation, a standard microphone lead is ud to connect the line output of the ACM
120XL to the line input of a power amplifier. The speaker load then needs to be split into two (one for each amplifier) making sure that each amplifier is driving no more than it’s recommended load. The line output is a balanced 700mV signal which can be ud to connect (daisy-chain) up to 6 power amplifiers. If more than 6 amplifiers are required, a distribution amplifier is recommended.
Microphone Inputs
The ACM120XL includes 8 microphone and line inputs. The microphone inputs are via 3 pin XLR female sockets. The microphone inputs are 200 ohm and are suitable for a wide range of dynamic or electret microphones. When using electret microphones, phantom power should be enabled for tho particular inputs. Phantom power (15v DC) is available on all XLR inputs and can be switched on or off per channel. To enable phantom power on a particular input channel, simply flip (on the rear panel) dip switch 3 (for that channel) to the on position.
Line Inputs
The ACM120XL includes 8 microphone and line (auxiliary) inputs. The line inputs are via dual RCA connectors per channel. Although the ACM120XL is a mono amplifier, dual RCA’s are provided to allow for easy connection to domestic or professional line sources. The line inputs are suitable for a
wide range of products including tuners, castte decks and CD players. As the output signal from line sources can vary immenly, four nsitivity ttings are available per line input. The ttings are adjustable via dip switches 1 and 2 per channel. The options are: Dip Switch 1 off, 2 off90mV at 47K ohm
Dip Switch 1on, 2 off9dB pad (cut)
Dip Switch 1off, 2 on12dB pad (cut)
Dip Switch 1on, 2 on15dB pad (cut)
Dip Switch 3 is for the XLR microphone input and switches phantom power on and off (e “Microphone Inputs”). Simultaneous U of Mic and Line Inputs Per Channel
The ACM120XL has 8 microphone and 8 line inputs. In most situations only the XLR or the dual RCA’s would be ud on a particular channel. In some circumstances however, more channels may be needed in which ca both the XLR and RCA inputs can be ud simultaneously per channel. When using both a mic and line input per channel, both inputs are mixed and are controlled simultaneously via the channel level control.
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Line Input Sensitivity
蒜蓉菜心Four nsitivity adjustments are provided for each line input. See “Line Inputs”.
Phantom Power
15v DC Phantom Power is lectable per XLR microphone input. See “XLR Microphone Inputs”. Phantom Power should only be ud on balanced electret microphones. Using phantom power with unbalanced microphones may damage the microphone.
Muting
The ACM120XL includes an advanced priority/muting system which is installer adjustable. When shipped, the ACM120XL has three priority inputs. From the factory, Input 1 has overall priority and mutes inputs 2-8 when signal is prent. Input 2 has condary priority and mutes inputs 3-8 when signal is prent. Input 3 has a third level of priority and mutes inputs 4-8 when signal is prent. Inputs 4-8 have no priority and are mixed. All muting in the ACM120XL is activated by signal (VOX) whether it be on the XLR or RCA inputs.
A number of muting options are available and can be altered via a ries of internal links located on t
he front mixer board behind inputs 1and 2.
