PRORECK SP-18X Active Powered PA Subwoofer Cabinet User Manual

1. Important Safety Instructions

Please read and keep all safety and use instructions for your PRORECK SP-18X Active Powered PA Subwoofer Cabinet.

1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produces heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wider blade or third prong is provided for your safety. If the provided plug does not fit in your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where it exits from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified personnel. Servicing is required when the apparatus has been damaged in any way such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

Warnings/Cautions:

• ⚠ WARNING: This symbol on the product means there is uninsulated, dangerous voltage within the product enclosure that may present a risk of electrical shock.
• ℹ IMPORTANT: This symbol on the product means there are important operating and maintenance instructions in this guide.
• ⓪ CHOKING HAZARD: Contains small parts which may be a choking hazard. Not suitable for children under age 3.
• ☣ MAGNETIC MATERIAL: This product contains magnetic material. Consult your physician on whether this might affect your implantable medical device.

2. Setup and Connections

2.1 Unpacking and Placement

Carefully remove the subwoofer from its packaging. Inspect for any signs of damage during transit. Place the subwoofer on a stable, flat surface. Ensure adequate ventilation around the unit.

Figure 2.1: PRORECK SP-18X Active Subwoofer

The subwoofer features two side handles for convenience in transport and positioning, and a top-mounted pole socket for mounting a full-range speaker.

Figure 2.2: Subwoofer features including lifting handle and pole mount

2.2 Rear Panel Connections and Controls

Familiarize yourself with the rear panel of the SP-18X, which houses all input, output, and control interfaces. Refer to the diagram below for component identification.

Figure 2.3: Rear Panel Layout and Controls

1. XLR Input: Balanced XLR input for connecting signals from mixers or other amplifiers.
2. XLR Output: Balanced signal output, for connection to another amplified system.
3. High Pass/ Full Range Selector: Output serial cut-off selector. When the button is pressed in, the output is High Pass (filtered from 120Hz). When the button is out, the output is Full Range. This signal is typically sent to a Mid-High active speaker.
4. Power Indicator: LED indicator for power status.
5. Signal: LED indicator for input signal presence.
6. Limit: This LED indicates that the input signal is too high, which may distort the output sound or even damage the unit.
7. Volume: This knob allows you to increase or decrease the overall volume control level.
8. Phase: Phase selection button. Choose between NORMAL and REV180° to align the subwoofer's phase with other speakers.
9. DSP Presets: Selector for three preset sound modes: Monitor, DJ, and Live.
10. ON/OFF Switch: Toggles the unit's power on or off.
11. Input Voltage: Specifies the operating voltage for the unit (110V 50/60Hz).

3. Operation

3.1 Powering On/Off

Connect the subwoofer to a suitable AC power outlet using the provided power cable. Ensure the ON/OFF Switch (10) is in the OFF position before connecting. Once connected, flip the switch to ON. The Power Indicator (4) will illuminate.

3.2 Audio Connections

Connect your audio source (mixer, preamplifier, etc.) to the XLR Input (1) on the rear panel. Use balanced XLR cables for optimal signal integrity. For connecting additional amplified systems or full-range speakers, use the XLR Output (2).

3.3 Volume and Phase Control

Adjust the Volume knob (7) to achieve the desired output level. Monitor the Signal (5) and Limit (6) LEDs to prevent clipping. Use the Phase button (8) to select between NORMAL and REV180° to ensure optimal bass response and phase alignment with other speakers in your system.

3.4 DSP Presets

The SP-18X features three Digital Signal Processing (DSP) presets to optimize sound for different applications. Select the desired preset using the DSP Presets control (9).

• FLAT (Monitor): Provides a clear and accurate sound with low and high roll-offs and a slight mid-range cut. This setting is ideal for theatrical productions, awards, dinner events, or general monitoring where a neutral sound profile is desired.


Figure 3.1: FLAT DSP Preset Frequency Response

• DJ: Boosts bass frequencies to help drive dance music and enhance your party's atmosphere. This preset is ideal for DJ and club events, or mixed media events such as weddings or parties.


Figure 3.2: DJ DSP Preset Frequency Response

• LIVE: Designed to give energy and brightness to live musical performances, with high and low-end roll-offs to lighten the sound. This setting is suitable for live bands, solo performances, and small to medium-sized outdoor or venue stages.


Figure 3.3: LIVE DSP Preset Frequency Response

4. Maintenance

• Cleaning: Clean the cabinet with a dry, soft cloth. Do not use abrasive cleaners, waxes, or solvents.
• Ventilation: Ensure all ventilation openings are clear and not blocked to prevent overheating.
• Storage: If storing the subwoofer for an extended period, unplug it from the power source and store it in a dry, dust-free environment.
• Servicing: All servicing should be performed by qualified personnel. Do not attempt to open the cabinet or repair the unit yourself.

5. Troubleshooting

6. Specifications

For a detailed user manual in PDF format, please refer to the official document: PRORECK SP-18X User Manual (PDF).

7. User Tips

• Optimal Placement: Experiment with subwoofer placement in your room or venue. Corner placement can often enhance bass response, but avoid placing it directly against a wall if it causes excessive boominess.
• Phase Alignment: If you are using the subwoofer with other full-range speakers, use the Phase button (8) to align the subwoofer's phase with your main speakers for a more coherent sound. Listen for the fullest bass response.
• DSP Preset Selection: Don't hesitate to try all three DSP presets (FLAT, DJ, LIVE) for different types of audio content or events. Each is designed to optimize the sound for specific scenarios.
• Gain Staging: Always set the volume controls on your mixer or audio source first, then adjust the subwoofer's Volume knob (7) to avoid clipping and distortion. The "Limit" indicator (6) will light up if the input signal is too high.

8. Warranty and Support

For warranty information, technical support, or service inquiries, please contact PRORECK customer service or refer to the official PRORECK website. Keep your purchase receipt as proof of purchase.