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VideoGain UnityBandwidth MLS 306 280 MHz (-3dB), fully loaded All other models 350 MHz (-3dB), fully loadedFrequency response < ± 0.1dB @ 30 MHzDifferential phase error 1.5º, 0 to 10 MHzDifferential gain error 1.5%, 0 to 10 MHzCrosstalk -50dB @ 5 MHzVideo inputNumber/signal type MLS 306 3 RGBHV, RGBS, RGsB, or RsGsBs 3: S-video, composite video MLS 506 Series 3 RGBHV, RGBS, RGsB, or RsGsBs 3: component video, S-video, or composite videoConnectors MLS 306 3 female 15-pin HD (RGB computer video) 3 female 4-pin mini-DIN (S-video) 3 female BNC (composite video) MLS 506 Series Female BNCsMinimum/maximum levels Analog: 0.0V to 2.0V p-p with no offsetImpedance 75 ohmsHorizontal frequency 15 kHz to 150 kHzVertical frequency 30 Hz to 150 HzReturn loss -45dB @ 5 MHzMaximum DC offset 1.5VVideo outputNumber/signal type MLS 306 2 RGBHV, RGBS, RGsB, or RsGsBs 1 S-video 1 composite video MLS 506 Series 1 RGBHV, RGBS, RGsB, or RsGsBs 1 component video 1 S-video 1 composite videoConnectors MLS 306 1 female 15-pin HD (RGB computer video output 1) 5 female BNC (RGB output 2) 2 female BNC (S-video) 1 female BNC (composite video) MLS 506 Series Female BNCsMinimum/maximum levels Analog: 0.0V to 2.0V p-p with no offsetImpedance 75 ohmsReturn loss -45dB @ 5 MHzDC offset ± 5mV maximumSwitching type Triple-Action for RGBSyncInput/output type RGBHV, RGBS, RGsB, RsGsBsStandards NTSC 3.58, NTSC 4.43, PAL, SECAMInput level 2V to 5V p-pOutput level TTL: 5.0V p-pInput impedance >1 kohmsOutput impedance 75 ohmsMax input voltage 5V p-pMax propagation delay… 30 nsPolarity Positive or negative: (follows input)AudioFrequency response MLS 306, MLS 506 20 Hz to 20 kHz, +0dB/-3dB MLS 506MA 50 Hz to 15 kHz, +0dB/-1dB;: 20 Hz to 20 kHz, +0dB/-3dB MLS 506SA 20 Hz to 20 kHz, +0dB/-1dB at 30 W into 8 ohmsTHD + Noise MLS 306, MLS 506 <0.2% @ 50 Hz to 22 kHz at rated maximum output drive MLS 506MA <0.8% @ 50 Hz to 22 kHz at rated maximum output drive MLS 506SA <0.5% @ 1 kHz at 30 W into 8 ohmsS/N >90dB at 22 Hz to 22 kHzCrosstalk <-65dB @ 20 Hz to 20 kHz, <-80dB @ 1kHz and below 60 Hz, fully loadedStereo channel separation MLS 506SA >80dB @ 1 kHz All other models >90dB @ 1 kHzCMRR >90dB @ 20 Hz to 200 Hz, >60dB @ 20 Hz to 20 kHzAudio inputNumber/signal type MLS 306, MLS 506 6 stereo, balanced/unbalanced MLS 506MA/SA 7 stereo, balanced/unbalancedConnectors MLS 306 Inputs 1 to 3: 3.5 mm captive screw connectors, 5-pole Inputs 4 to 6: 3.5 mm captive screw connectors, 5-pole or female 3.5 mm mini stereo jacks (unbalanced) MLS 506 6: 3.5 mm captive screw connectors, 5-pole MLS 506MA/SA 7: 3.5 mm captive screw connectors, 5-poleImpedance >18 kohms unbalanced/balancedMaximum level +21dBu (balanced or unbalanced) at stated % THD + NInput gain adjustment MLS 306, MLS 506: -15dB to +9dB, adjustable per inputInput level adjustment MLS 506MA, MLS 506SA: -78dB to +24dB (in 1 to 100 steps), adjustableper inputAudio — effects return (MLS 506MA & MLS 506SA)Number/signal type 1 stereo, unbalancedConnectors 1: 3.5 mm captive screw connector, 3-poleImpedance >10 kohms unbalancedLevel +4dBu, unbalancedAudio — effects send (MLS 506MA & MLS 506SA)Number/signal type 1 stereo, unbalancedConnectors 1: 3.5 mm captive screw connector, 3-poleImpedance 50 ohms, unbalancedLevel +4dBu, unbalancedAudio output — line level (all models)Number/signal type 2 stereo/mono (selectable), balanced/unbalanced (1 fixed, 1 variable)Connectors 2: 3.5 mm captive screw connectors, 5 poleImpedance 50 ohms unbalanced,: 100 ohms balancedGain — fixed output MLS 306, MLS 506 Unbalanced 0dB Balanced +6dB MLS 506MA, MLS 506SA Unbalanced 0dB Balanced +6dB Gain — variable output only Selectable output level MLS 306, MLS 506 Unbalanced 0dB (jumper selectable), or -6dB (jumper selectable, default) Balanced +6dB (jumper selectable), or 0dB (jumper selectable, default) MLS 506MA, MLS 506SA Unbalanced 0dB (jumper selectable), or -6dB (jumper selectable, default) Balanced +6dB (jumper selectable), or 0dB (jumper selectable, default)Gain error ±0.1dB channel to channelMaximum level (Hi-Z) >+21dBu, balanced at stated %THD+NMaximum level (600 ohm) >+15dBm, balanced at stated %THD+NAudio output — power amp (MLS 506MA & MLS 506SA)Number/ signal type MLS 506MA 1 mono MLS 506SA 1 stereoConnectors 4 position screw terminalSensitivity -20dBu (100mV) for 30 watts outputDrive/power (full power out) At less than 0.5% THD from 20 Hz to 20 kHz: MLS 506MA (70V, mono) 30 watts (RMS); 4 ohm, 8 ohm, or 70V output taps with common/ground, transformer coupled MLS 506MA (100V, mono) 30 watts (RMS); 4 ohm, 8 ohm, or 100V output taps with common/ground, transformer coupled MLS 506SA (stereo) 60 watts; 30 watts (RMS) per channel, 4 ohm or 8 ohm loadProtection MLS 506MA Input limiting, thermal, short circuit MLS 506SA Input limiting (user specifies 4 ohm or 8 ohm load), thermal, short circuitIndication MLS 506MA Clip LED indicates the onset of 30 watt power limiting MLS 506SA Clip LED indicates the onset of 30 watt power limiting on left or rightControl/remote — switcherSerial control port 1 RS-232, female 9-pin D connector (shared with contact closure port)1: 3.5 mm captive screw connector, 5 pole (for control via MLC 206; shared with IR control port)Baud rate and protocol 9600, 8-bit, 1 stop bit, no paritySerial control pin configurations 2 = TX, 3 = RX, 5 = GNDContact closure 1 female 9-pin D connector (shared with serial control port)Contact closure pin configuration pin 1 = input 1, pin 4 = input 2, pin 5 = ground, pin 6 = input 3,pin 7 = input 4, pin 8 = input 5, pin 9 = input 6IR control port 1: 3.5 mm captive screw connector, 5 pole (shared with the MLC/IR serial control port) for 38 kHz IR signalsProgram control Extron's control program for Windows®Extron's Simple Instruction Set™ _ SIS™GeneralPower 100VAC to 240VAC, 50/60 Hz, internal, autoswitchable MLS 306, MLS 506 20 watts MLS 506MA 60 watts MLS 506SA 100 wattsTemperature/humidity Storage -40° to +158°F (-40° to +70°C) / 10% to 90%, non-condensingOperating +32° to +122°F (0° to +50°C) / 10% to 90%, non-condensingRack mount Yes, with included bracketsEnclosure type MetalEnclosure dimensions MLS 306 1.75" H x 17.5" W x 9.4" D: (1U high, full rack width) 4.4 cm H x 44.4 cm W x: 23.9 cm D (Depth excludes connectors and knobs. Width excludes rack ears.) (Depth excludes connectors and knobs. Width excludes rack ears.)Product weight MLS 306 5.5 lbs (2.5 kg)Shipping weight MLS 306 9 lbs (4.1 kg)Vibration ISTA/NSTA 1A in carton (International Safe Transit Association)Listings UL, CULCompliances CE, FCC Class A, VCCI, AS/NZS, ICESMTBF 30,000 hours
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Line Magnetic Audio: Brand Overview
Line Magnetic Audio was established in 2005 in Zhuhai, China, by brothers Zheng Cai and Zheng Xi, both passionate audiophiles with deep roots in tube electronics. Zheng Cai's background as a former general manager and chief engineer at Cayin, combined with years spent studying and restoring classic Western Electric, Altec, and Jensen components, provided the technical foundation for the company. This heritage of reverse-engineering and understanding legendary 1950s American audio design remains central to Line Magnetic's identity and philosophy.
The brand specializes in tube-based electronics and speakers, with a product range spanning integrated amplifiers, preamplifiers, power amplifiers, DACs, phonostages, and horn-loaded loudspeakers. Line Magnetic is particularly renowned for its meticulous replicas of classic Western Electric, Altec, and Jensen designs, as well as proprietary field-coil drivers that have earned respect among both manufacturers and DIY enthusiasts. All products are hand-assembled using point-to-point wiring across two factories, reflecting an uncompromising manufacturing philosophy.
Line Magnetic occupies the high-end boutique segment, targeting discerning collectors and audiophiles who value vintage-inspired design married with modern engineering. The brand commands respect for its scholarly approach to audio history, rigorous material research, and unrelenting build quality. Rather than pursuing mass-market appeal, Line Magnetic has cultivated a devoted global following among those seeking authentic tube sound and meticulous craftsmanship.
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