QT15SA

QT Series Active Sub Cabinets

170.751UK

Introduction

Thank you for choosing a QT-series active subwoofer as part of your sound system. This unit is designed to offer powerful sub frequencies for PA systems in leisure and entertainment applications.

Package Contents

Please check the contents to ensure that the product has been received in good condition with the appropriate mains lead(s). If you find that the product has arrived with any problems, please contact your retailer at once.

Warning

This product contains no user-serviceable parts so make no attempt to try to fix or modify this item yourself as this will invalidate the warranty. We recommend you keep the original package and proof of purchase for any possible replacement or returned demand. To prevent the risk of fire or electric shock, do not expose this appliance to rain or moisture. To prevent electric shock do not remove the cover. No user serviceable parts inside. Refer servicing to qualified service personnel.

Prior to connecting mains, check the supply voltage is correct and the mains lead is OK.

Avoid ingress of water or particles into the enclosure.

If the mains fuse blows continually, refer the unit to qualified service personnel.

Placement

Keep the unit out of direct sunlight and away from heat sources.

Keep the unit away from moisture or dusty environments.

Avoid locations where liquids may be spilled onto the unit.
Ensure that any supporting structures have adequate load capacity for the weight of the unit.

Ensure adequate space for cooling to the rear panel and easy access for controls and connections.

Cleaning

Use a soft cloth with a neutral detergent to clean the cabinet, panel and controls.

To avoid damage, do not use solvents to clean this equipment.

Rear Panel Layout

Setup & Operation

With INPUT LEVEL turned fully down and power switch off, connect the IEC to an appropriate mains outlet.

Connect output of mixer or any line level signal to the INPUT via XLR. If the signal is to continue to further active speakers, connect these from the THRU line level XLR.

Begin with the FREQUENCY control in the mid position (12-o-clock position)
Press the power switch on and gradually increase the INPUT LEVEL until the bass signal is heard through the speaker.

Turning the FREQUENCY control up will include more mid frequencies and turning it down will eliminate all but the lowest frequencies. Adjust the FREQUENCY control to the desired tone, noting that lower settings may need the INPUT LEVEL turning up to compensate for the narrower frequency band.

The PHASE switch can help eliminate speakers which are “out-of-phase” from cancelling each other’s signals out. The correct setting for this switch is whichever setting gives the loudest output – by a process of trial and error. One or other setting may also help to avoid feedback.
If there is no difference in volume or feedback, leave the switch in the “0°” position (out)

To avoid loud noises when powering down, turn down the OUTPUT LEVEL before switching off.

Troubleshooting

Issue	Solution
No output and no LEDs lit	Check POWER switch is on
	Check mains lead is connected properly and fuse hasn’t blown
Power LED lit but no sound from external inputs	Check signal leads are OK and connected properly
	Try turning up the FREQUENCY control
	Ensure input signal has some bass content for the sub to produce
	Check INPUT LEVEL control is not fully down

Specification

Specification	Value
Weight	22kg
Dimensions	640 x 555 x 440mm
Power handling : max.	600W
Power rms	150W
Driver	380mm (15'')
Power supply	230Vac, 50Hz (IEC)
Cut-off frequency	40 - 150Hz
Connections	XLR line in, XLR line out

Precautions

	CAUTION
	RISK OF ELECTRIC SHOCK DO NOT OPEN
CAUTION : TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK) NO USER-SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit

This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit

Safety Notice

Prior to use, read through this safety guide.
Pay attention to safety warnings.
Observe all operating requirements.
For any items designed for indoor use only, do not operate near water or in humid environments.
For cleaning, only use a lint-free, dry cloth.
Install according to the specifications.
Place away from heat sources or heating appliances.
During placement, ensure adequate support for the product and access to controls and connectors.
Do not obstruct any cooling vents or openings and allow adequate space for air flow.
Use only power connections supplied with the product or suitable equivalents.
Do not modify the equipment in any way.
For any mains powered appliances, ensure that the mains voltage is as described in the specifications.
Keep powered products and batteries away from the reach of children.
In case of malfunction, water ingress or other damage, consult qualified service personnel.
Avoid pressure or impact to the housing that may result in damage when transporting or installing this product.
For any Earthed mains product, ensure that the power supply has a protective Earth connection.
Keep all packaging materials out of reach of children.

Disposal : The "Crossed Wheelie Bin" symbol on the product means that the product is classed as Electrical or Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life. The goods must be disposed of according to your local council guidelines.