Marantz 4300 100 WPC Quadraphonic Receiver – Restored – Free WC-43 Wood Case – 1-Year Warranty
Garden Grove, CA, United States
About this listing
Marantz 4300 100 WPC Quadraphonic Receiver – Restored – Free Wood Case 43 – 1-Year WarrantyUp for sale is the Marantz 4300, a large-format vintage Stereo 2 + Quadradial 4 receiver introduced in the early 1970s and developed around Marantz's high-output four-channel receiver architecture.The 4300 provides 100 watts per channel in 2-channel stereo operation and 40 watts per channel in 4-channel operation, with mode selection controlled from the rear panel. It also features the Gyro-Touch tuning wheel, blue illuminated dial, built-in Dolby Noise Reduction, and Vari-Matrix circuitry for creating four-channel effects from compatible program material.This unit has been professionally restored, serviced, and tested by HQaudios while preserving the original engineering and operating characteristics of the Marantz 4300.1/ Key HighlightsAuthentic Marantz 4300 Quadraphonic ReceiverBridged Power Output: 100 Watts x2 (Stereo) or 40 Watts x4 (Quadraphonic)Iconic Blue Tuning Dial and Dual Tuning/Signal MetersFamous Gyro-Touch Horizontal Tuning WheelBuilt-in Dolby Noise Reduction and Vari-Matrix CircuitProfessionally Restored and Serviced by HQaudiosAmplifier stages, power supply, and tuner functions inspected and testedReal-world operational and listening test performedCarefully packed for safe deliveryBacked by Our 1-Year HQaudios Warranty2/ Sound CharacterThe Marantz 4300 delivers the smooth, full-bodied presentation commonly associated with vintage Marantz receivers, with strong dynamic capability and substantial output when properly matched with compatible speakers.In 2-channel stereo operation, the 100-watt-per-channel output provides substantial headroom for a wide range of compatible loudspeakers. In quadraphonic operation, the 4300 can reproduce discrete or matrix-encoded four-channel program material, while its Vari-Matrix circuit can synthesize four-channel effects from conventional stereo sources.Its built-in phono stage and FM tuner section make the 4300 a versatile centerpiece for a vintage analog system, supporting both record playback and radio listening.3/ Cosmetic ConditionThis unit is in Excellent vintage cosmetic condition, with normal signs of age and previous use consistent with classic audio equipment from the 1970s.Please review all photos carefully, as they are part of the description.Faceplate / Front Panel: The thick brushed aluminum faceplate is clean with fully legible lettering, showing minor superficial wear around the edges.Knobs / Controls / Sliders: All original solid aluminum knobs, push-buttons, and balance sliders are intact and operate smoothly.Cabinet / Housing: The original heavy metal chassis cover is structurally solid with typical vintage aging and light surface marks.Display / Dial Glass: The glass is clear, and the classic blue dial illumination and meters glow beautifully.Rear Panel / Connections: Speaker terminals, RCA inputs, AM ferrite antenna, and massive heat sinks are intact and securely mounted.4/ HQaudios Restoration & Testing ProcessBefore RestorationThe Marantz 4300 was carefully inspected upon arrival to evaluate its overall mechanical, electrical, operational, and cosmetic condition.Particular attention was given to the heavy-duty power supply, four independent amplifier stages, phono board, Vari-Matrix circuitry, Dolby processing board, tuner section, Gyro-Touch tuning string, potentiometers, sliders, switches, and dial illumination.The inspection results were used to determine the work required for this specific unit.During RestorationBased on the inspection results, this Marantz 4300 was restored according to HQaudios' technical standards while preserving its original engineering and operating characteristics.The internal amplifier circuitry, power supply, controls, switches, Dolby section, Vari-Matrix circuitry, tuner functions, and display illumination were inspected and serviced according to the condition identified during evaluation. Operating adjustments and functional checks were performed to support stable operation.After RestorationOnce restoration was completed, this unit underwent comprehensive functional testing under real operating conditions.Output power under load, channel balance, quadraphonic functions, AM/FM tuner reception, tone controls, phono stage, inputs, outputs, and meter responsiveness were tested. Finally, the receiver underwent an extended real-world listening test to evaluate thermal stability and overall operating performance.Only after completing HQaudios' restoration and testing process was the unit approved and prepared for its next owner.5/ SpecificationsBrand: MarantzModel: 4300Type: Quadraphonic (Stereo 2 + Quadradial 4) AM/FM ReceiverPower Output (Stereo): 100 Watts per channel into 8 Ohms (x2)Power Output (Quadraphonic): 40 Watts per channel into 4 Ohms (x4)Frequency Response: 10 Hz–30 kHzTotal Harmonic Distortion: 0.15%Damping Factor: 40Inputs: Phono, Aux/CD-4, Tape 1, Tape 2Special Features: Gyro-Touch Tuning, Dolby Noise Reduction, Vari-Matrix CircuitPower Requirement: Refer to the rear-panel voltage specification of the actual unit before operation.Dimensions: Approx. 19.29 W × 5.75 H × 15.20 D in (490 × 146 × 386 mm)Weight: Approx. 51.8 lbs / 23.5 kgCondition: Restored / Serviced / TestedWarranty: 1-Year HQaudios Warranty6/ What Is Included• 1 Marantz 4300 Stereo 2 + Quadradial 4 Receiver• 1 Free WC-43 Wood Case• 1-Year HQaudios Warranty7/ Video Test & Sound DemoIf you would like to see or hear the Marantz 4300 in operation before purchase, please contact HQaudios directly. Additional operational photos, close-up images, and video demonstrations can be provided upon request.8/ Suggested PairingThe Marantz 4300 pairs well with compatible vintage acoustic-suspension or high-efficiency speakers when impedance, power requirements, room size, and listening preferences are properly considered.Classic 1970s FloorstandersSpeakers: JBL L100, Pioneer HPM-100, or large Altec Lansing systemsWhy it works: The 4300 provides substantial stereo-mode output and can pair well with efficient classic loudspeakers when impedance and power requirements are properly matched.Vintage Vinyl SetupTurntable: Marantz 6300, Pioneer PL-530, or Dual 1229Why it works: The 4300's built-in phono input provides a convenient way to integrate a compatible moving-magnet turntable into a vintage analog system.For the best performance, ensure that all connected equipment is electrically and mechanically compatible with the receiver and properly configured before use.9/ Basic Use GuideTo help maintain the long-term performance of this vintage quadraphonic receiver, we recommend the following:Verify operating mode: The rear panel switch must be set correctly to either 100W x2 (Stereo) or 40W x4 (Quadraphonic) before powering on. Do not switch this mode while the unit is operating.Ventilation is critical: The 4300 generates significant heat due to its massive power supply and four independent amplifiers. Ensure adequate breathing room above the top chassis vents. Never stack other equipment on top of this receiver.Verify speaker impedance: Ensure your speakers match the safe operating impedance required by the amplifier, especially when running multiple pairs.Verify rear-panel voltage configuration: Confirm the voltage requirement shown on the actual unit before connecting it to AC power.Please contact HQaudios directly if assistance with setup, operating mode, or speaker matching is needed.10/ Trade-In ProgramDo you have vintage audio equipment you'd like to trade in?HQaudios welcomes trade-ins on receivers, amplifiers, speakers, cassette decks, reel-to-reel decks, turntables, and other classic audio equipment.Simply send us photos and basic information about your equipment. Our team will review the item and discuss available trade-in options.11/ Build Your Vintage System / Combo DiscountLooking to build a complete vintage audio system?HQaudios can help match the Marantz 4300 with compatible vintage audio components (or a custom wood cabinet).Save $100 when purchasing this receiver together with a qualifying restored vintage audio component from HQaudios.Please contact HQaudios directly before purchase so we can confirm availability and prepare a combined offer.12/ Shipping & PackagingLarge vintage receivers require careful handling during shipment. This approximately 23.5 kg / 51.8 lb unit will be professionally packed by HQaudios for safe delivery.Protective wrapping applied securely around the chassis and faceplate.Heavy-duty packing materials used to absorb impact.Extra dial glass, Gyro-Touch wheel, knob, and rear connection protection.Tracking information provided immediately upon shipment.Signature may be required upon delivery.13/ 1-Year HQaudios WarrantyThis unit is backed by our 1-Year HQaudios Warranty, covering proper electronic and functional operation under normal home use.If an issue occurs, please contact HQaudios first. Our team will help evaluate the issue and work toward an appropriate solution.The warranty does not cover misuse, improper setup, unauthorized repair, physical damage, cosmetic wear, amplifier clipping, excessive power, incorrect wiring, incompatible equipment, operation outside the manufacturer's intended specifications, or shipping damage identified after delivery.14/ Customer ServiceAfter delivery, please contact HQaudios directly for assistance with setup, connections, operating modes, equipment matching, and model-specific settings.Our team is happy to help customers use their vintage audio system correctly and confidently.15/ Important Note for Vintage Audio BuyersThis is vintage audio equipment, so minor signs of age may be present and are normal for equipment that has been in use for many years.Vintage audio equipment must be connected and operated correctly. Always verify voltage configuration, speaker impedance, and other model-specific operating requirements before powering on the system.HQaudios – Vintage Audio Restored with Care. Backed by Our 1-Year Warranty.
Price$3,399
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from Garden Grove, CA
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