Mackie TH-18S Owner's Manual download pdf (Page 10)

7. LEVEL

The LEVEL control adjusts the overall signal level at

the input to the built-in power ampliﬁer. It ranges from

-6 dB to +6 dB (maximum gain), with unity gain at the

center position (12 o’clock).

The control has no effect on the level of the high-

pass outputs [5] or the full-range outputs [4].

8. THERMAL LED

The TH-18s is equipped with a thermal protection

circuit that monitors the internal temperature of the

ampliﬁers and heatsink. If the temperature exceeds a

safe operating level, this indicator lights and the input

signal is muted to allow the ampliﬁers to cool. When

the temperature cools to a safe level once again, the

thermal protection circuit deactivates, the Thermal

LED turns off and the TH-18s returns to normal

operation.

When the TH-18s is in thermal protect mode, the

power LED [11] will remain lit, indicating that the unit

is still powered on despite the lack of output.

Activation of the thermal protection circuit

is an indication that you should take steps

to avoid continued thermal problems. See

“Thermal Protection” on page 12.

9. OL LED

The OL (overload) indicator lights when the

ampliﬁer in the TH-18s is near the clipping point. It is

okay if the OL indicator blinks occasionally, because

this means that the transient peaks are just reaching

the maximum output of the ampliﬁer and you are

getting the most from your TH-18s.

If the OL indicator is blinking frequently or lighting

continuously, turn down the LEVEL control [7] on the

TH-18s or turn down the signal at it source

(e.g., the mixing console) until the OL indicator blinks

occasionally or not at all.

10. SIGNAL LED

This LED illuminates green whenever there is a

signal present at the main input connector. It senses the

signal just after the Level control, so adjustments to the

level control will affect the signal indicator.

11. POWER LED

This LED illuminates when the power switch [2] is

turned on and the linecord is connected to an active AC

Mains supply.

TH-18s

ACTIVE SOUND

REINFORCEMENT SUBWOOFER

REVISION

SERIAL NUMBER

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR

MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

POWER

INPUTS

OUTPUTS

HIGH PASS

FULL RANGE

LEVEL

OL SIGNAL POWER

POL ARITY

NORMAL

INVERT

THERMAL

+6dB 6dB

118

9 10

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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Mackie TH-18S Owner's Manual Page 10

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