The Samson SM4 4-Channel Mixer is a versatile rack-mount audio mixer designed for various sound applications, featuring microphone and music inputs, Bluetooth® connectivity, and a USB port for an optional Samson XPD USB Digital Wireless System.
Function Description:
The SM4 serves as a central hub for mixing up to four audio channels. It accepts a balanced microphone input via a combo XLR/1/4” jack, providing 15V phantom power for condenser microphones. Stereo line-level music inputs are available through rear-mounted RCA jacks and front-mounted 1/4” and 1/8” (3.5mm) stereo jacks. For wireless audio streaming, the mixer incorporates Bluetooth® connectivity, allowing users to pair and stream music from compatible devices. An integrated USB port supports Samson's Stage XPD Series USB Digital Wireless Systems (sold separately) and also offers 5V 200mA power for charging small portable USB devices like MP3 players or smartphones. The mixer features a Voiceover control with priority ducking and variable hold time, which automatically lowers the music channel and Bluetooth® audio when a signal is present on the Mic channel. Output options include balanced XLR and unbalanced RCA outputs, which can be configured for stereo or mono operation via a rear-panel switch. A master volume control on the rear panel adjusts the overall output level.
Important Technical Specifications:
- Frequency Response (Mic to Main): 30Hz–30KHz (Level@Max, unity gain +1/-3dB)
- T.H.D (Mic/Line to Main): <0.02% (Level@Max, unity gain, 20Hz–30KHz A-Weighted)
- Equivalent Input Noise (Mic): <-75dB 20Hz–30KHz A-weighted (Level@Max)
- Maximum Voltage Gain:
- Mic to Main: 32dB
- Line to Main (RCA Input): 8dB
- Stereo Line to Main (1/4", 1/8" Input): 8dB
- Residual Noise (Main): -110dB (30kHz LPF, all control Min)
- Crosstalk (@1kHz w/30kHz LPF):
- Input vs. Output (unity gain, Level set min): >82dB
- Input vs. Output (Max output, Level set min): >70dB
- Maximum Input Level (@1kHz, Mic Input): -18dB
- Maximum Output Level (@1kHz, Mic Output): +14dB
- Input Channel Equalizer (±3dB):
- High: ±12dB@12KHz
- Low: ±10dB@80Hz
- USB Output Power: USB3.0 +5V DC 0.2A max
- Phantom Power: 15 Volts DC
- Power Requirements: DC15V 800mA
- Bluetooth: V4.0, A2DP
- Bluetooth Working Frequency: 2.402GHz ~ 2.480GHz
- Bluetooth RF Power: <10 mW EIRP
- Dimensions: 8.78" x 5.43" x 1.69" (223mm x 138mm x 43mm)
- Weight: 1.76 lbs / 0.8 kg
- Chassis: Compact, half-rack steel chassis
- Mounting: Rackmount kit included
Usage Features:
- Front Panel Controls:
- Power Switch: Turns the unit on/off.
- Power Indicator: White LED indicates power status.
- MIC Volume: Adjusts the level of the microphone input.
- BASS Equalizer Knob: Controls the low-frequency band (±15dB at 100Hz) for the MIC channel.
- TREBLE Equalizer Knob: Controls the high-frequency band (±15dB at 10kHz) for the MIC channel.
- MUSIC Volume: Adjusts the level of all music inputs (rear RCA, front 1/4”, and 1/8”).
- VOICEOVER: Controls the level by which music and Bluetooth® audio are lowered when a microphone signal is detected.
- 1/8" (3.5mm) Music Input: Stereo jack for line-level sources, controlled by MUSIC Volume.
- 1/4" Music Input: Stereo jack for line-level sources, controlled by MUSIC Volume.
- Pairing Indicator: Displays Bluetooth status.
- Pairing Button: Initiates Bluetooth discoverable mode.
- Samson XPD WIRELESS USB Input: For optional Samson XPD USB Digital Wireless receiver; level controlled by MIC Volume. Also provides phone charging.
- Bluetooth Antenna: Receives Bluetooth signal; should be vertical for optimal range (approx. 100' / 30m).
- Rear Panel Controls:
- DC Input: Connects the supplied 15V 800mA power adapter. Includes a strain relief feature.
- BAL MIC INPUT: Combo XLR/1/4” jack for microphones or wireless receivers, with 15V phantom power on the XLR input.
- Stereo RCA MUSIC INPUT: Line-level input for devices like MP3 players or CD players.
- VOICEOVER HOLD: Adjusts the hold time (0.5s–3s) for the Voiceover priority ducking.
- MASTER VOLUME: Controls the overall output level of the mixer.
- Balanced XLR OUTPUT: Connects to power amplifiers or speakers.
- STEREO / MONO Switch: Selects between stereo (left and right signals to corresponding outputs) or mono (left and right input signals summed and fed to both outputs) operation.
- Unbalanced RCA OUTPUT: Connects to power amplifiers or speakers.
- Bluetooth Pairing: To pair a Bluetooth device, press and hold the PAIR button on the front panel until the indicator flashes slowly. On the Bluetooth device, select "Samson SM4" from available devices. Enter "0000" if a passkey is requested. The indicator will flash quickly during connection and turn steady blue when paired.
- Quick Start Guide: Provides step-by-step instructions for setup, including connecting microphones, music sources, and outputs, as well as initial volume adjustments. Emphasizes the "LAST ON, FIRST OFF" rule for power sequencing to prevent damage.
- Avoiding Feedback: Offers tips to minimize microphone feedback, such as positioning the microphone behind speakers, maximizing distance from speakers, and positioning the microphone close to the sound source.
Maintenance Features:
- General Care: With proper care, the SM4 is designed for many years of trouble-free operation.
- Servicing: In case of servicing needs, a Return Authorization (RA) number must be obtained from Samson before shipping the unit. The original packing materials should be retained for return shipping.
- Cleaning: Clean the unit only with a dry cloth.
- Ventilation: Ensure good ventilation around the entire unit.
- Safety Information: Includes important safety warnings, such as avoiding exposure to dripping or splashing water, not placing objects filled with liquids on the apparatus, and not placing naked flame sources on the unit.
- Disposal: Instructions for proper disposal of electronic products in accordance with environmental regulations, encouraging separate collection and recycling.
- Power Cord Protection: Protect the power cord from being walked on or pinched.
- Attachments/Accessories: Only use attachments/accessories specified by the manufacturer.
- Power Adapter: Use only the supplied power adapter; substituting others can cause severe damage and void the warranty. The direct plug-in adapter is the disconnect device and should remain readily operable.
- Environment: Intended for use in moderate and/or tropical climates.
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