POWER SWITCH with built-in status indicator

Turns on the Power Engine when right side is pushed in and will glow red when
engaged. Be sure power amp connections are secure and check the AC power source
prior to engaging the Power Switch.
BACK PANEL

1/4” INPUT*

Receives unbalanced input signals.

XLR INPUT*

3-pin female XLR balanced input for professional applications. Reduces hum and allows
use of longer cables without signal degradation.
*NOTE: If you have the choice, we recommend utilizing the XLR input of the Power
Engine. Additionally, do not use both inputs at the same time.

GROUND LIFT

Disconnects (isolates) the ground circuits between the XLR Output of the Power Engine
and the mixer to eliminate hum caused by ground loops. We recommend starting with
the ground lifted. If necessary, connect the ground by pushing the button in.

XLR OUTPUT

3-pin female XLR balanced output for professional applications to connect to a studio
mixer or P.A. Reduces hum and allows use of longer cables without signal degradation.
It is directly connected to the Input but unaffected by the Level control(s). If you require
more wattage for large venues, our XLR Output allows you to endlessly chain Power
Engines together.

PARALLEL SPEAKER OUTPUTS

1/4” speaker jacks. NOTE:Turn off Power Engine before connecting your speakers.
For Power Engine 300: Do not use speakers rated at less than 4 Ohms, as it could
cause undesirable distortion or potentially overheat the Power Engine. Speakers rated
at a higher value will result in loss of power.
For Power Engine 400: Do not use speakers rated at less than 8 Ohms, as it could
cause undesirable distortion or potentially overheat the Power Engine. Speakers rated
at a higher value will result in loss of power. NOTE: You cannot run the Power Engine
400 in bridge/mono mode. If you require less wattage for smaller venues, you can
choose to use only one side.
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POWER ENGINE SPECIFICATIONS
Note: With on-going product development and improvements, specifications and/or
the cosmetic appearance of this unit may change without prior notice.
AC Input Power (factory set): 100V, 117V, 230V, 240V
Cycles: 50/60 Hz
NOTE: Each unit constructed for specific voltages. AC power cannot be switched.
Unit Dimensions: 17”w x 3.5”h x 10”d
Overall (with ears, feet and handles): 19”w x 3.8125”h x 11.5”d
Weight: Power Engine 300: 22.3 lbs.
Power Engine 400: 26.25 lbs.
Optional Speaker Cabinets:
•4x12TM4x12, 320-watt, 8-Ohm closed-back cabinet with special design
Celestion®speakers, available with black grill and silver piping or wheat grill
and white piping. Either style is available in slant or straight front formats.
•B410 4x10, 400-watt, 8-Ohm rear-vented bass cabinet with cast-frame,
custom-designed speakers; chrome-plated steel grill.
•B115 1x15, 300-watt, 8-Ohm bass cabinet with custom-designed
Eminence®Neodymium speaker; chrome plated steel grill.
Replacement parts(i.e., knobs, logo plate, handles, ears, hardware, etc.) are avail-
able through your authorized dealer, distributor or directly from Tech 21.
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PW300
>3.3KOhm
>10KOhm
-10dBm
4 Ohms
300W RMS @ 4Ωmin load
200W RMS @8Ω
150W RMS@ 16Ω
same as input
PW400
>3.3KOhm
>10KOhm
-10dBm
8 Ohms per side
200W RMS @8Ω min/side
150W RMS@ 16Ω
same as input
Model Number:
XLR Input Impedance:
1/4” Input Impedance:
Nominal Input Level:
Optimal Output Load:
RMS Continuous Power Output:
XLR Output Level: