Earthquake Sound SM6BT Professional Studio Monitor User Manual

Introduction

Thank you for purchasing the Earthquake Sound SM6BT professional active studio monitor. These monitors are designed for accurate audio reproduction, sound clarity, transparent performance with low distortion, and exceptional imaging, meeting the demands of audiophiles and professionals worldwide. The SM6BT features a bi-amplified Class AB amplifier, accepting unbalanced (RCA) and balanced (XLR/TRS combo jack) inputs, along with Bluetooth® v5.3 True Wireless Stereo (TWS) connectivity. An integrated subwoofer output allows for a 2.1 audio system setup. The high-frequency trim adjustment control lets you tailor the sound to your preferences. Each monitor is equipped with a stiff, low-mass 6.5-inch carbon fiber cone woofer for low harmonic distortion and a 2-inch wide band ribbon tweeter for clear, detailed treble, ensuring balanced, transparent, and neutral audio reproduction.

Amplifier Features

The rear panel of the SM6BT monitor houses various input and control features:

• 1. Unbalanced RCA Input: For connecting to TVs, computers, DJ equipment, or mobile devices.
• 2a. Balanced XLR Input: A 10kΩ balanced XLR input for audio interfaces or mixers.
• 2b. Balanced 1/4-Inch TRS Input: A 10kΩ balanced TRS input for audio interfaces or mixers. Use a balanced 1/4-inch TRS phone plug for best results.
• 3. Main Power Switch: Controls AC power to the monitor. Recommended to keep OFF when not in use for extended periods.
• 4. 110V/220V Selector Switch: Allows operation in 110-120V or 220-240V environments. Slide to the required setting and replace the fuse accordingly.
  [WARNING] ⚠️: Use of improper voltage may result in hazardous conditions and/or damage not covered by warranty. Ensure the monitor is disconnected from power before adjusting this switch.
• 5. AC Power Inlet with Fuse Holder: Fused to protect against power surges. Uses a Ø5 x 20mm 2A/250V UL/VDE slow blow tube fuse. Access the fuse compartment by unplugging the power cable and using a flat-head screwdriver to gently pry open the cover.
• 6. Subwoofer Output: An unbalanced RCA output for connecting to a powered subwoofer.
• 7. TWS Status LED Indicator: Indicates True Wireless Stereo (TWS) master and slave status. The master speaker (usually left channel) will have the rear amp LED ON, and the slave speaker (usually right channel) will have the rear amp LED OFF when paired.
• 8. Pairing Button: Used to connect the SM6BT to a mobile device via Bluetooth®.
• 9. True Wireless Stereo (TWS) Button: Used to put two SM6BT monitors into TWS pairing mode.
• 10. Input Selector Switch: A 2-way switch to select between Bluetooth® (up) and unbalanced/balanced inputs (down). Ensure the correct position is selected before Bluetooth® pairing.
• 11. LED ON/OFF Selector Switch: A 2-way switch to turn the front LED indicator light on or off.
• 12. Level Adjustment Knob: Controls input sensitivity. Set to maximum (+6dB), adjust source output, then use this knob to match left and right monitor levels.
• 13. HF Trim Knob: Adjusts high-frequency response. Factory set at 0dB (flat), adjust to tailor sound to listening preferences.

Connector Diagrams:

XLR/TRS Connector Pinout:

• Pin 1: Sleeve (Shield) = Ground (cable shield)
• Pin 2: Tip = Positive/Red/Hot
• Pin 3: Ring = Negative/Black/Cold

Unbalanced TS Connector: Used for unbalanced signals.

[NOTE] ℹ️: CONNECT ONLY ONE INPUT SOURCE AT A TIME.

Safety Instructions

Safety First

This manual contains essential safety, installation, and operating instructions for the SM6BT studio monitors. Read this manual thoroughly before use, paying close attention to safety instructions.

Symbols Explained:

• [CAUTION] ⚠️: Appears on the component to indicate the presence of uninsulated, dangerous voltage inside the enclosure, which may be sufficient to constitute a risk of shock.
• [WARNING] ⚠️: Calls attention to a procedure, practice, or condition that, if not correctly performed or adhered to, could result in injury or death.
• [WARNING] ⚠️: Calls attention to a procedure, practice, or condition that, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product.
• [NOTE] ℹ️: Calls attention to any information that is essential to highlight.

General Safety Precautions:

1. Read all instructions in their entirety.
2. Store this manual and packaging in a safe place.
3. Read all warnings.
4. Follow instructions; do not take shortcuts.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install according to manufacturer's instructions.
8. Do not install near heat sources (radiators, heat registers, stoves, etc.).
9. Do not defeat the safety purpose of polarized or grounding-type plugs.
10. Protect the power cord from being walked on or pinched.
11. Only use attachments and accessories specified by the manufacturer.
12. Use only a compatible rack or cart for resting position.
13. Unplug during lightning storms or when unused for long periods.
14. Refer all servicing to qualified personnel. Servicing is required for damaged power cords/plugs, spilled liquids, fallen objects, exposure to rain/moisture, abnormal operation, or drops.
15. To reduce fire or electric shock risk, do not expose the apparatus to rain or moisture.

Unpacking System Components:

• Keep the original carton and packing materials for future shipment or storage.
• Check for any visual signs of damage. Consult your dealer for concealed damage before installation.
• Retain the sales receipt for warranty duration and insurance purposes.

Warranty Information

5 YEAR LIMITED WARRANTY INFORMATION

Earthquake Sound warrants original purchasers that all Factory Sealed New Audio products are free from defects in material and workmanship for five (5) years from the date of purchase, provided the product is properly installed by an Earthquake Sound authorized party and the warranty registration card is completed and sent. If installed by a non-authorized party, a thirty (30) day warranty period applies.

Warranty Guidelines:

• First Year: Earthquake covers labor, parts, and ground freight within the US Mainland (excluding Alaska and Hawaii). Shipping to Earthquake Sound is not covered.
• Second, Third, Fourth, & Fifth Year: Earthquake covers labor only. Customer is responsible for parts and freight both ways.

Warning: Products tested by Earthquake technicians and found to have no problem will incur a minimum one (1) hour labor charge plus return shipping. Products sent for repair must be in original packaging; otherwise, repackaging charges apply.

Warranty Provisions: Earthquake agrees to repair or replace defective products/parts under the following conditions:

• Defects not caused by alteration or repair by unauthorized personnel.
• Products/parts not subjected to negligence, misuse, accident, or improper line voltage.
• Products/parts not used with incompatible products.
• Serial numbers not altered, defaced, or removed.
• Products/parts used in accordance with Earthquake's written instructions.

Warranty Limitations: Earthquake warranty does not cover products modified or abused, including damage from misuse, abuse, improper cleaning, bent speaker frames, broken connectors, holes in speaker cones, or deterioration due to improper exposure.

Service Request: Contact Earthquake Sound's service department at (510) 732-1000 or tech@earthquakesound.com for an RMA number. Provide complete shipping address, daytime phone number, and a brief problem description. Technicians may resolve issues over the phone or via email.

Shipping Instructions: Package products in original boxes to minimize damage. Shipper claims for transit damage must be presented to the carrier. Earthquake Sound reserves the right to refuse improperly packaged products. A copy of the original sales receipt must accompany returned products. Customer is responsible for shipping costs to Earthquake Sound Corporation.

Disputes Resolution: Disputes related to the warranty policy must be resolved according to the laws of Alameda County, California.

Monitor Placement

Proper placement is crucial for optimal performance. Follow these guidelines:

Studio/Stereo Application

Place monitors within the front 1/3 of the room, approximately 3 to 5 feet apart, angled at 60 degrees towards your listening position. Position the ribbon tweeters at approximately ear height when seated. For optimized performance, angle the monitors to aim directly at your ears. Avoid placing large objects near the monitors and listening position to reduce distortion from reflection and diffraction.

Surround Sound Application

Begin by placing the center channel monitor directly in front of your listening position. Position the front left and right monitors at an equal distance, angled 25 to 30 degrees from the center, forming a slight arc. Place rear monitors at an equal distance from the listening position, angled 90 to 110 degrees from the center.

Connecting Your SM6BT Monitor

The SM6BT offers multiple connection options for various audio sources:

Unbalanced RCA Input

A common input for home audio setups, suitable for driving signals from AV equipment. Use high-quality, short cables to minimize noise and interference.

Balanced XLR & TRS Input

Widely used in professional audio, these balanced connections carry signals over longer cable runs, reducing susceptibility to electromagnetic interference (EMI). The combo jack provides a true balanced input with conductors isolated relative to ground.

Bluetooth® Pairing & Connecting

True Wireless Stereo (TWS) Pairing: Press and hold the TWS button on both master and slave monitors for over 2 seconds. A "TWS PAIRING" prompt tone will be heard. The monitors will pair, and the master (left channel) will have its rear amp LED ON, while the slave (right channel) will have its rear amp LED OFF.

Mobile Devices Connection: Press and hold the PAIRING button on the master monitor for over 2 seconds (LED will flash rapidly). Find "SM6BT" in your mobile device's Bluetooth® list. Upon successful connection, the LED will stop blinking, and a "successful pairing" tone will be heard.

Specifications

Frequency Response Graph

The frequency response graph illustrates the monitor's performance across audible frequencies. The horizontal axis represents frequency in Hertz (Hz), ranging from 20Hz to 30kHz. The vertical axis represents amplitude in decibels (dB), showing output levels from -10dB to +10dB relative to a reference point. Multiple colored lines indicate different measurement curves or settings, showing how the monitor's output varies with frequency.

Troubleshooting

Address common issues with the following steps:

The Front LED Does Not Light Up

• Inspect the power cable for damage.
• Verify the AC power outlet is active and supplying correct voltage.
• Ensure the monitor's AC selector is set correctly and the fuse is not blown.
• Check that the power cord is securely plugged into the unit and the outlet.
• Confirm the POWER switch is ON.
• Ensure the LED ON/OFF selector is in the correct position.
• If fuses blow after switching on, contact Earthquake Sound Technical Support.

The Front LED Lights Up But There Is No Sound

• Verify all other devices plugged into the same AC outlet are working.
• Ensure the signal source (e.g., mixing console) is at a proper output level.
• Turn the VOLUME knob (system gain) fully clockwise to +6dB.
• Ensure the audio source cable is firmly plugged into both the source and monitor.
• If using two monitors and only one has no sound, swap the audio input cables to determine if the issue is with the monitor or the cable.
• If the problem persists, contact Earthquake Sound technical service.

The Monitor Suddenly Stops Working

• Turn the SM6BT monitor OFF.
• Perform the steps for "No Sound" issues first.
• Check if the amplifier's back plate is hot. Overheating may trigger protection circuitry. Turn the monitor OFF for at least 30 minutes to allow it to cool down before turning it back on.
• Increase the volume to check for normal operation.

The Sound Quality Changes

• Perform previous troubleshooting steps before proceeding.
• Disconnect the signal cable. With the monitor powered on, listen near the drivers for any noise (hiss, hum). If no noise is heard, a driver or internal electronics may be faulty.
• Reconnect the cable and play non-distorted material at low volume. Cover the tweeter. If the woofer sounds distorted or has no sound, it may be internally disconnected or need replacement.
• Cover the woofer. If the tweeter sounds unclear or has no sound, it may be internally disconnected or need replacement.

The Monitor Produces Hisses, Hums, or Other Loud Noises

• Ensure the power cord is firmly plugged in.
• Inspect the signal source connection. Note that XLR and 1/4" TRS connectors are balanced. For unbalanced signals, use Pin 2 and tie Pins 1 and 3 together at the source end.
• Ensure the AC mains match the operating voltage requirements.
• Ensure all audio equipment uses the same ground point. Avoid connecting dimmers, neon signs, TV screens, and computer monitors to the same AC output as the audio equipment.