ETI Sound Systems, INC ACT-18X User Manual

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1. Read all the instructions before attempting to use the ACT-18X.
2. Follow all instructions contained in this manual.
3. Keep these instructions in a safe place where they can be found and 

referred to in the future.

4. Use common sense in operating your ACT-18X and heed all warnings 

included in your operating manual.

5. Do not use the ACT-18X near water.  Do not use it in or near a washtub, 

sink, pool, standing water, bathtub, or anyplace where the likelihood of 
water mixing with electricity is present.

6. Clean only with a clean dry cloth.
7.  Do not locate your ACT-18X in an area which has limited or very poor 

ventilation. Obstructing the fan intake, outlet or the heat sink will likely 

cause the product to overheat and shut down.
8. Do not install the ACT-18X near any heat sources such as radiators, 

stoves, portable electric heaters or other devices that produce significant 
amounts of heat.  If you do, it could cause the product to overheat and 
shut down.

9. Do not touch the amplifier heat sink with an ungloved or 

unprotected hand while or shortly after the ACT-18X has been operating.  
The heat sink may get hot during operation.   

10. Do not attempt to defeat the safety purpose of the AC cord’s polarized 

grounded plug.  If the provided plug does not fit your outlet, hire an 
electrician to replace the obsolete outlet.

11.  Protect the AC mains power cord from being damaged.
12. SERVICING - The user should not attempt to repair a damaged or 

inoperable ACT-18X other than by replacing a blown AC mains fuse or a 
damaged detachable power cord. DO NOT TOUCH A DAMAGED POWER 
CORD IF IT IS PLUGGED INTO AC MAINS POWER!!!!!

13. Turn off and unplug the ACT-18X when not in use except during a lighting 

storm.  A lightning strike on the AC line equipment is plugged into could
cause electrocution to those in contact with that equipment.  This is why 
your ACT-18X comes with a 3-prong power cord.  The third prong (Earth 
ground) is to prevent such harm.  Should you believe an electrical storm 
to be imminent, then it would be wise to unplug the ACT-18X BEFORE the 
storm approaches.

14.  To reduce the risk of fire or electric shock, do not expose the ACT-18X to 

rain or moisture.

15.  Servicing may be required when the ACT-18X has been damaged.  If any 

of the following conditions listed below has occurred, please turn off and 
unplug the ACT-18X and seek the help of qualified service personnel.  The 
following conditions all require service:
1) The power-cord or plug is damaged.
2) Objects have fallen into, or liquid has been spilled into the amp. 
3) The ACT-18X has been exposed to significant moisture such as rain or 
fog and or there is present condensation inside the amplifier due to 
weather conditions. (If there is condensation on the outside of the 
heatsink, it is safe to assume the condensation is present inside as well.)
4) The unit is not operating normally.
6) The unit has been dropped with significant force and is not 
operating normally.

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1200-watt Digital Amplifier with Voltage Tracking Power Supply

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1200 watts @ 4 Ohms

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800 watts @ 8 Ohms

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Built-in compressor-limiter

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Built in 24db/octave Crossover

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Crossover Frequency: 120 Hz @ 24db/octave

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Subsonic Filter:  32 Hz High Pass (18 db/octave)

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Nominal Loudspeaker Impedance (each subwoofer): 8 Ohms

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Minimum Load Impedance: 4 Ohms (One active and one passive sub)

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Minimum Power Consumption (with no signal input) 20 watts

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Power Requirements: Up to 12 Amps @120v@60Hz

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XLR Balanced Inputs

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XLR Full Range Outputs 

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XLR Balanced High Pass Outputs

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0-180° phase switch

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Speakon Style Speaker Output Connector for connecting a passive Sub (SP-18XS)

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Thermal & Short Circuit Protection 

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Signal sensing circuitry with LED indicator

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Power handling of 1200 Watts RMS, 2400 Watts peak

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Sensitivity: 102 dB @ 2.83V @ 1 Meter  

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Peak SPL: 132 dB @ 1 Meter

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4-layer, 4 Inch Diameter Voice Coil

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Extra durable non-press paper cone

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Heavy duty Polyester-Cotton double spider for great long term mechanical stability

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Magnetically optimized forged T-yoke with deep bump for high excursions

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Undercut pole piece for lower distortion and better mechanical clearance 

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Double thick Fiberglass Voice coil former for incredible rigidity at the driving point

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Extreme high temperature enamel and adhesive used on voice coil wire

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Precision machined low-carbon steel magnetic circuit

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Super duty polyester-cotton accordion edge surround

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Double spiders to afford superior protection from bottoming and rocking 

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Superior grade of 13-ply Baltic Birch

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Heavy duty scratch resistant durable black paint finish.

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16-Gauge perforated steel grille for maximum protection

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2 & 3/8” diameter steel pole-mount cup.

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Flared ports for highest available output without port noise

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Dimensions (W) x (H) x (D): 24” x 33” x 22”

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Weight: 110lbs

To reduce the risk of fire or electrical shock, do

not expose this system to rain or moisture