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.
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.
The handheld microphones use a simple interface to manage power, volume, and channel selection. Power On/Off: Press and hold the Power Button.
Battery Installation: Unscrew the microphone base to reveal the compartment. Insert 2 x 1.5V AA batteries.
Channel Switching: Press and hold the Set Button for approximately 4 seconds until the display blanks. The unit will cycle through channels in the order A, B, C, and D. Volume Adjustment: Press the Set Button once to enter volume mode. Press the Set Button again to adjust the level. The device exits this mode after 5 seconds of inactivity.
Button Lock: To prevent accidental changes, press and hold both the Set and Power buttons simultaneously for 3 seconds. Repeat to unlock. Receiver & System Operations
The system uses UHF frequencies (typically 902-928MHz depending on your specific region) to provide digital audio transmission.
Connection: Ensure the receiver is connected to your mixer or amplifier using the balanced XLR or unbalanced 1/4" jack outputs.
Signal Monitoring: The receiver will display Signal Strength icons when the microphone is successfully paired and within range. audio choice qm4 manual
Mute Function: Depending on the specific firmware version, some QM4-style handhelds allow muting by double-clicking the volume or power key. Troubleshooting Guide If you encounter issues, check these common solutions:
No Sound: Verify the transmitter is not in "Mute" and check if the receiver's volume is turned up.
Interference: If you hear static or other voices, use the Set Button to switch all components to a different channel (A, B, C, or D) to find a clearer frequency.
Distortion: If the audio is too loud or clipping, turn down the Volume on the receiver or the Gain on your mixer.
Power Issues: If the LED doesn't light up, ensure the power adapter is securely connected to both the wall and the receiver. PROFESSIONAL WIRELESS MICROPHONE SYSTEM MANUAL
Function of Handheld Microphone Transmitter 1. Microphone head 2. LCD screen 3. Power switch: Press and hold to turn on or off. 4. FCC Report WIRELESS MICROPHONE SYSTEM
The Mysterious Lab
You are a skilled detective who specializes in solving paranormal cases. You have been hired by a wealthy client to investigate a mysterious lab on the outskirts of town. The lab, known as "Eclipse," is rumored to be conducting secret experiments in the field of quantum mechanics.
As you approach the lab, you notice a strange symbol etched into the door. It looks like a combination of mathematical equations and hieroglyphics. You shrug and push the door open.
Inside, you find yourself in a dimly lit room with a single chair and a console in front of you. The console has a small screen and a series of buttons. Suddenly, a disembodied voice speaks to you through the intercom.
"Welcome, detective. I see you've made it past the entrance. Congratulations. You are now in the QM4 manual control room. To proceed, you must navigate through a series of audio choices. Please select one of the options to continue."
You look at the console and see three options:
A) Play a recording of a cryptic message from the lab's director, Dr. Emma Taylor. B) Listen to a tutorial on quantum mechanics and its applications in the lab. C) Hear a ominous warning from an unknown source about the dangers of the lab.
Which option do you choose?
(Please respond with the letter of your chosen option)
QM4 Manual Control Room
You have three options:
A) Dr. Taylor's Message B) Quantum Mechanics Tutorial C) Ominous Warning
Choose your response:
What is your choice?
A B C
Audio Choice QM4 (often branded as Audio Choice by SoundTech
) is a 4-channel powered PA mixer designed for portability and ease of use in small venues, practice spaces, and karaoke setups. While a dedicated digital "manual" is rare for this vintage unit, its functions follow standard analog mixer logic. Core Specifications & Features The Audio Choice by SoundTech QM4 is a
The QM4 is a "powered head," meaning it combines a mixer and a power amplifier in one unit. Power Output
: 100 Watts RMS at 4 ohms (typically 2 x 100W for stereo models). Input Channels : 4 mono channels, each equipped with: Combination Inputs
: Accepts both XLR (low-impedance) and 1/4" (high-impedance) cables. Per-Channel Controls : Individual knobs for (often a single high/low sweep), and Master Section Master Level : Controls the overall volume of the system. : Global adjustments for Low, Mid, and High frequencies. Reverb Master
: Global control for the built-in spring or digital reverb effect.
: 1/4" Send and Return jacks for connecting external processors.
: To send the signal to another amplifier or recording device. Footswitch Jack : Allows hands-free toggling of the internal reverb. Operational Guide
: Connect your speakers to the 1/4" outputs on the rear panel before turning the unit on. Using a 4-ohm or 8-ohm load is standard; ensure your speaker cables are unshielded "speaker" cables, not "instrument" cables. Input Gain
: Plug in your microphone or instrument. Start with the channel Master Level
low, then gradually increase them until you reach the desired volume without the "Clip" light (if present) flickering constantly. Tone Shaping
: Use the per-channel Tone knobs to remove "mud" (turn left) or add "crispness" (turn right). Use the Master 3-Band EQ to compensate for the room's acoustics.
: Turn up the channel Reverb knob to decide how much of that specific voice/instrument goes to the effect, then use the Master Reverb knob to set the overall "wetness" of the sound. Typical Applications Small Gigs/Coffee Shops : Ideal for acoustic duos or solo performers.
: The built-in reverb and multiple mic inputs make it a popular budget choice for home or bar setups. Public Speaking : Portable enough for seminars and church halls. Where to Find More Info
Audio Choice QM4 (often branded as Audio Choice by SoundTech
) 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.
The Audio Choice QM4 Go to product viewer dialog for this item. (often listed as Audio Choice by SoundTech QM4
) is a portable 4-channel powered mixer head typically paired with matching two-way speakers. While a direct PDF link to the original manufacturer's manual is not readily available through standard digital archives, the following report summarizes the essential operational and technical details found in professional equipment listings and user documentation. System Overview Audio Choice QM4
is a "budget" professional audio system designed for small venues, band practice, DJ gigs, and karaoke. It is known for being rugged, lightweight, and easy to operate. Technical Specifications Power Output: 100 Watts RMS at 4 ohms. Channels: 4 independent channels. Key Specifications (typical for Qm4-class cartridges)
Inputs: Each of the 4 channels features combination XLR and 1/4" ports. Channel Controls: Individual adjustments for: Gain (Level) Tone (High/Low EQ) Reverb
Master Section: Includes a 3-band Master EQ, Master Reverb, and Master Level controls. Additional Connectivity: EFX Loop: For external effects processing.
Line Out: For connecting to additional amplifiers or recording devices.
Footswitch Jack: For remote reverb control (footswitch usually sold separately).
Speaker Configuration: Usually includes two C100 10-inch, 2-way speaker enclosures featuring horn tweeters. Physical Dimensions
Mixer Head: Approximately 18.5" W x 11.5" D x 6" H; Weight: ~9.5–20.5 lbs.
Speakers (each): Approximately 19.5" H x 14" W x 11" D; Weight: ~22 lbs. Operational Guidance
Setup: Use standard speaker cables to connect the outputs on the rear of the QM4 head to the inputs on the C100 speakers.
Mixing: Connect microphones via XLR or instruments/line sources via 1/4" cables. Adjust the individual channel gain first, then use the Master Level to control the overall volume.
Troubleshooting: If you experience "scratchiness" in the Master EQ, a common issue in older units, cleaning the potentiometers with specialized contact cleaner is often recommended by users.
For further assistance, you may find related documentation for similar SoundTech products at retailers like Reverb or through professional audio archives.
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.
Since "Audio Choice" is not a widely recognized major brand for professional audio equipment, it is highly likely you are referring to a Theatre Solutions QM4, QTX QM4, or a generic 4-Channel Stereo Amplifier often sold under various brand names (like Adastra or Velleman).
These units are commonly used for multi-room audio or small commercial installations (restaurants, shops).
Below is a comprehensive guide based on the standard operations of the QM4 Series 4-Channel Amplifier.
Note: Exact numbers should be checked in the official manual/spec sheet for your Qm4 serial or production variant.
