Audio Choice Qm4 Manual -

Audio Choice QM4 (produced by ) is a portable, 4-channel powered PA mixer designed for live performances, DJ gigs, and small venues. It is commonly bundled with speakers, such as the

or original 2-way 10" enclosures, to create a complete sound system. System Features Power Output : Delivers 100 Watts RMS at 4 Ohms. : Four individual input channels, each featuring both Channel Controls : Individual adjustments for Master Section

: Includes a 3-band Master EQ, master reverb level, and master volume controls. Connectivity Options : For connecting external effects processors.

: For sending the signal to additional amplifiers or recording devices. Footswitch Jack : Allows remote control of the onboard spring reverb. Physical Specifications

The system is built for portability with rugged construction and integrated handles. Dimensions (H x W x D) QM4 Mixer Head 6" x 18.5" x 11.5" C100 Speaker (Each) 19.5" x 14" x 11" Operational Highlights Spring Reverb

: The QM4 uses an original analog spring reverb for a classic "wet" vocal or instrument sound. Low Noise Performance

: The mixer is designed to remain silent when no audio is playing and maintain clarity even at high output levels. Ease of Use

: With straightforward controls and standard connectors, it is frequently used for bar trivia, karaoke, and small band practices.

The Audio Choice QM4 by SoundTech is a 100-watt, 4-channel powered mixer designed for portable PA applications like small venues and karaoke, featuring independent channel controls and 3-band master EQ. Often paired with C100 speakers, the unit offers versatile inputs including 1/4" and XLR jacks, with options for EFX loops and reverb. Technical details and unit availability can be found at Musician's Friend Audio Choice C100 100W Portable PA System

The Audio Choice QM4 (by SoundTech) is a 4-channel, 100-watt powered PA mixer head designed for live sound reinforcement, such as small club gigs, band practices, or karaoke.

While a dedicated digital manual is rare for this discontinued unit, the following operational and technical information serves as a comprehensive guide for its use. Core Specifications Power Output: 100 Watts RMS at 4 ohms. Channels: 4 independent input channels.

Inputs: Each channel features combination XLR (balanced) and 1/4" jack (unbalanced) inputs.

Weight: Approximately 9.5 to 20.5 lbs depending on the specific model variation/enclosure. Operational Controls Per-Channel Controls: Gain: Sets the input sensitivity for the specific channel. Tone: Basic equalization for individual sound sources.

Reverb: Controls the amount of built-in spring reverb effect applied to that channel. Master Section:

3-Band EQ: Global Low, Mid, and High frequency adjustments for the overall output.

Master Level: Controls the final volume sent to the speakers.

EFX Loop: Allows for the connection of external effects processors.

Line Out: For sending the mixed signal to another amplifier or recording device.

Footswitch Jack: Typically used to remotely toggle the internal reverb. Setup and Safety Instructions

Speaker Connection: Use standard 1/4" speaker cables to connect to passive enclosures. The system was originally bundled with 2x10" enclosures.

Power Sequencing: To protect your speakers, always turn the Master Level to minimum before powering on. Turn the power amplifier (PA head) on last and off first in your signal chain.

Clipping: If the "CLIP" or "PEAK" indicator lights up, reduce the individual channel gain or master volume immediately to prevent distortion and hardware damage.

Maintenance: The unit contains no user-serviceable parts. If the master EQ becomes "scratchy" over time, it may require professional cleaning of the internal potentiometers. QM4 AND QS4 Instruction Manual - TDK Product Center

Audio Choice QM4 (often branded as Audio Choice by SoundTech audio choice qm4 manual

) is a 100-watt, 4-channel powered PA mixer head typically sold as part of the C100 portable system. While a formal digital manual is rare, the device's straightforward analog design allows for easy operation based on its physical controls. Musician's Friend Core Specifications Power Output : 100 Watts RMS at 4 Ohms. : 4 independent input channels. Dimensions : approximately 18.5" W x 11.5" D x 6" H.

: Mixer head weighs roughly 9.5 to 20.5 lbs depending on the specific revision/listing. Key Controls & Features Input Options : Each of the four channels features combination (line) inputs. Channel Controls : Individual knobs for on every channel. Master Section : Includes a (High, Mid, Low), a master control, and a master Connectivity : For connecting external effects processors.

: For sending a signal to another amplifier or recording device. Footswitch Jack : Allows for remote toggling of the built-in spring reverb. Basic Operation Guide Connections

: Plug microphones into the XLR ports and instruments (like keyboards or guitars) into the 1/4" ports. Connect your passive speakers to the outputs on the rear using 1/4" speaker cables.

: Ensure master volume is at zero before turning on the power switch to avoid pops. Setting Levels

: Adjust individual channel gain until the signal is clear without distortion, then use the master level to control overall volume. Tone Shaping

: Use the individual channel tone knobs for quick adjustments and the master 3-band EQ for room-wide sound correction.

Introduction

The Audio Choice QM4 is a high-quality audio amplifier designed for home and professional use. This guide will walk you through the manual to help you get started with your QM4.

Front Panel Controls

1. Power Button: Press to turn the amplifier on or off.
2. Volume Control: Adjusts the overall volume level.
3. Input Selector: Choose from four input sources (A, B, C, or D).
4. Tone Controls:
   • Bass: Adjusts low-frequency response.
   • Treble: Adjusts high-frequency response.

Rear Panel Connections

1. AC Power Cord: Connect to a 120V AC power outlet.
2. Input Connectors: Connect audio sources to these RCA jacks (A, B, C, or D).
3. Speaker Terminals: Connect speakers to these binding posts.
4. Ground Terminal: Connect to a grounding point (optional).

Operating the QM4

1. Turn on the amplifier: Press the Power Button.
2. Select an input source: Use the Input Selector to choose the desired input (A, B, C, or D).
3. Adjust volume and tone: Use the Volume Control and Tone Controls to adjust the sound to your liking.
4. Connect speakers: Connect speakers to the Speaker Terminals.

Additional Features

1. Protection Circuitry: The QM4 has built-in protection against overheating, short circuits, and overvoltage.
2. Low-Noise Design: The QM4 features a low-noise design for clear and distortion-free audio.

Troubleshooting

1. No power: Check the power cord and ensure it's properly connected.
2. No sound: Check speaker connections, input source, and volume level.
3. Distortion or noise: Check for loose connections, faulty cables, or excessive volume levels.

Specifications

• Power Output: 4 x 100W (into 8 ohms)
• Frequency Response: 20Hz - 20kHz
• Total Harmonic Distortion (THD): < 0.1%
• Signal-to-Noise Ratio (SNR): > 90dB

Conclusion

The Audio Choice QM4 is a versatile and high-performance audio amplifier. By following this guide, you'll be able to understand its features and operations, ensuring a great listening experience.

The Audio Choice by SoundTech QM4 is a vintage-style 4-channel powered PA mixer designed for portability and ease of use in small venues, karaoke setups, or band rehearsals. While official printed manuals are rare today, the system's straightforward design makes it accessible even without documentation. Key Specifications & Features

The QM4 is characterized by its "all-in-one" approach, combining an amplifier and mixer into a single head unit. Power Output: Delivers 100 watts of power at 4 ohms.

Mixer Channels: 4 independent channels, each featuring combination 1/4" and XLR inputs.

Channel Controls: Each channel includes dedicated knobs for Gain, Tone, and Reverb.

Master Section: Includes a 3-band EQ, master reverb control, and a master level slider.

Connectivity: Features an EFX loop, line out, and a footswitch option for remote reverb control. Audio Choice QM4 (produced by ) is a

Physical Build: Rugged design with built-in handles for transport. The mixer head typically weighs around 9.5 to 20.5 lbs depending on the specific model variant. Setup and Operation Guide

For those without the original Audio Choice QM4 manual, follow these steps to get started:

Connect Speakers: Use standard speaker cables to connect the outputs on the rear of the QM4 head to your passive speakers (often paired with two 10" enclosures).

Zero the Mixer: Before powering on, turn all channel Gain and Master Level controls to their minimum positions to avoid sudden loud noises.

Input Connection: Plug microphones into the XLR ports or instruments/line-level sources (like a phone or laptop) into the 1/4" ports.

Power On: Switch the unit on and slowly raise the Master Level, followed by the individual channel Gain until the desired volume is reached.

EQ Adjustment: Use the 3-band EQ in the master section to shape the overall sound and the individual channel Tone knobs for specific sources. Troubleshooting Tips

No Sound: Ensure the Master Level is up and the correct input is selected. Check that speaker cables are fully seated.

Distortion: If you hear clipping or "fuzzy" sound, reduce the Gain on the specific channel or lower the Master Level immediately to prevent speaker damage.

Silent Background: The QM4 is noted for being remarkably silent when no audio is playing; if you hear excessive humming, check for faulty cables or ground loop issues.

For users seeking more advanced soundbars or active speakers with a similar name, you may want to check the Q Acoustics M4 Soundbar Manual or the Quest QM4 Active Loudspeaker, which are different products.

4.1 Charging

• Connect the USB cable to a standard 5V/1A-2A USB charger (not included) or computer USB port.
• Red LED: Charging.
• LED off / Blue LED: Fully charged.
• Full charge time: Approximately 2–3 hours.

Part 7: Frequently Asked Questions (FAQ)

Q: Does the Audio Choice QM4 have a microphone for calls? A: Yes, most QM4 models include a built-in microphone with noise reduction. The manual shows that a single press of the Power button answers/ends calls; long-press rejects.

Q: Can I use the QM4 while charging? A: Yes. However, the manual notes that charging while playing at maximum volume may increase heat. If the device gets uncomfortably warm, pause playback until it cools.

Q: How do I restore factory settings? A: With the device powered off, press and hold Power + Volume Up + Bluetooth button for 8 seconds. The LED will flash white three times, confirming a factory reset.

Q: Where can I get replacement parts (ear cushions, USB cable)? A: Contact Audio Choice customer support directly. The manual lists replacement part numbers in the appendix.

Quick Guide: AudioChoice QM4 — Essential Manual Highlights

If you’ve got an AudioChoice QM4 (portable Bluetooth speaker) in hand — or you’re eyeing one — here’s a vivid, practical, reader-focused rundown of the key manual details you actually need: setup, daily use, troubleshooting, and tips to get the best sound and battery life.

What’s in the box

• QM4 speaker
• USB-C charging cable
• Aux (3.5mm) cable
• Quick-start leaflet / manual
• Warranty card

First setup — get it playing fast

1. Charge it: plug the USB-C cable into the speaker’s charging port and a USB wall adapter or powered USB port. A full charge typically takes ~2–3 hours; indicator LED goes solid when done.
2. Power on: press and hold the power button until the LED and a short tone confirm power-up.
3. Pairing (Bluetooth): after power-on, press the Bluetooth button (or hold power if indicated) to enter pairing mode — LED will blink. On your phone/computer, enable Bluetooth, find “AudioChoice QM4” and tap to pair. A voice or tone confirms connection.
4. Auxiliary use: plug the 3.5mm cable between device and speaker; the QM4 auto-switches (or press Input) to AUX.

Core controls (common, concise)

• Power: press/hold to turn on/off.
• Play/Pause: single press.
• Volume +/-: press the volume buttons; long-press often skips tracks (depends on model).
• Bluetooth: enter pairing mode or reconnect last device.
• Input: toggle between Bluetooth and AUX.
• LED indicators: charging, battery low, pairing status.

Sound and placement tips

• Place the speaker on a solid surface, elevated slightly off soft fabric to reduce muffling.
• Facing the speaker toward the listening area gives clearer highs; place near a corner for more bass (but expect muddiness).
• For outdoor use, keep it sheltered from direct wind and rain — splash-resistant doesn’t mean weatherproof.
• If you want fuller sound, set the source device EQ to boost mids/highs sparingly; the QM4’s small driver benefits from slight treble lift.

Battery care & maximizing life

• Full charge gives several hours depending on volume and codecs — typically 8–12 hours at moderate levels.
• Avoid fully draining the battery frequently; recharge when low.
• Store partially charged (40–60%) if you won’t use it for months.
• Use lower volumes for much longer runtimes; Bluetooth streaming uses more power than AUX.

Troubleshooting — fast fixes

• No power: ensure cable and adapter work (test with another device), try a different USB port, hold power for a few seconds.
• Won’t pair: delete “AudioChoice QM4” from your device’s Bluetooth list, turn Bluetooth off/on, restart both devices, re-enter pairing mode.
• Low volume or distorted sound: lower source device volume, check for interfering EQ or sound enhancements, try AUX to rule out Bluetooth compression.
• Intermittent audio dropouts: move closer to the speaker (reduce distance/obstacles), check for nearby Wi‑Fi or microwave interference, ensure battery isn’t critically low.
• LED error patterns: consult the leaflet for specific blink codes — often they indicate charging, pairing, or fault states.

Maintenance & safety

• Wipe with a soft, dry cloth; avoid solvents or submersion.
• Don’t block passive radiators or ports; keep them free of dust.
• Keep away from high heat, open flames, and liquids.
• If the speaker gets wet, power off and dry fully before charging or using.

When to contact support

• Battery won’t charge after trying multiple cables/adapters.
• Speaker is totally unresponsive to button presses.
• Persistent rattling or mechanical noises suggesting driver damage.
• If under warranty, have serial/model and purchase date ready.

Concise feature notes

• Bluetooth streaming + AUX in.
• Rechargeable lithium battery, USB-C charging.
• Built-in mic for calls (if present on your unit).
• Compact driver with possible passive radiator for bass boost.

Short, practical checklist before sale or gifting

• Confirm charger and aux cable included.
• Test Bluetooth pairing and playback.
• Charge to at least 50% before handing over.
• Clean exterior, remove fingerprints/dust.

If you want, I can:

• Draft a 1-page printable quick-start leaflet for the QM4.
• Create a battery-troubleshooting flowchart.
• Write a short troubleshooting script for phone support agents.

Which of those would you like?

The Audio Choice by Sound Tech QM4 is a 100-watt, 4-channel powered mixer head designed for small PA systems, featuring XLR/1/4" inputs, individual channel EQ, and onboard reverb. Operated by connecting passive speakers to the rear output and balancing channel levels with the master volume, this legacy unit is frequently found on reselling platforms. For a detailed listing with specs, visit Reverb.

The Audio Choice QM4: A Comprehensive Guide to Your 4-Channel PA System Audio Choice by Sound Tech QM4

is a rugged, portable 4-channel powered mixer designed for small venues, rehearsal spaces, and mobile performers. Delivering 100 watts of power at 4 ohms

(often configured as 100W RMS), this system is built to provide clear, reliable sound without the complexity of larger professional rigs. Key Hardware Specifications Power Output : 100 Watts at 4 Ohms. Mixer Inputs : 4 discrete channels, each featuring both XLR and 1/4" inputs Portability : The mixer weighs approximately

(some variants noted at 9.5 lbs) and measures roughly 6" H x 18.5" W x 11.5" D. Speaker Configuration : Frequently bundled with two 10" 2-way enclosures

featuring performance-rated horn tweeters for extended high-end clarity. Operating Your QM4: Basic Instructions

Each of the four input channels on the QM4 is designed for individual control, allowing you to balance multiple microphones or instruments simultaneously. Input Setup

: Connect your microphones to the XLR ports or instruments (like keyboards or acoustic-electric guitars) to the 1/4" jacks. Channel Controls : Each channel features independent knobs for: : To set the initial input sensitivity. : A simple EQ adjustment to brighten or darken the sound.

: Controls the amount of built-in spring reverb applied to that specific channel. Master Section

: The overall sound is shaped in the master section, which includes:

: For broad adjustments across Low, Mid, and High frequencies. Master Level : To control the final output volume sent to the speakers.

: Allows you to connect external effects processors if the built-in reverb isn't sufficient. Safety and Maintenance Ventilation

: Like most powered mixers, the QM4 relies on airflow to prevent overheating. Ensure the rear or side vents are never blocked by cloth or placed against soft surfaces like rugs. Speaker Pairing

: Ensure your speakers match the 4-ohm impedance requirement of the amplifier to avoid damage to the power stage.

: The unit must be reliably earthed (grounded) to prevent electrical hum and ensure user safety. Additional resources for sound system setup and maintenance Buying & Used Listings Technical Support Where to find QM4 equipment

often hosts listings for the SoundTech QM4, including full portable PA sets with original speakers and cables. For parts or used professional audio gear,

is a reliable source for finding QM4 mixers and similar signal processors. Manuals and Technical Data

General instruction manuals for QM-series equipment, focusing on power and safety, are available through the TDK Product Center Power Button : Press to turn the amplifier on or off

If you are looking for modern alternatives or digital versions of classic setups, Armour Home Electronics