Marantz 4400 Receiver — Flagship Step into the world of vintage high-fidelity with the iconic Marantz 4400, a powerhouse from Marantz’s golden era of quadraphonic sound. Manufactured in the mid-1970s (roughly 1974–1978) , this receiver was the flagship quadraphonic model — brimming with premium features, raw power, and timeless design. Why the Marantz 4400 stands out: Produces 125 W per channel in stereo and 50 W per channel in quadraphonic mode, delivering both punch and nuance. Maintains a remarkably low Total Harmonic Distortion (THD) of 0.15%, ensuring clean, crisp audio across the board. Broad frequency response, spanning 20 Hz to 20 kHz, with exceptional power bandwidth going from ~7 Hz up to 70 kHz. Built-in oscilloscope on the front panel — not just a visual flair, but a functional tuning meter and real-time signal display. Flexible quadraphonic decoding: uses plug-in decoders (SQ, QS, CD-4, etc.), so you can adapt to different 4-channel formats. Advanced Dolby FM noise-reduction, with a multi-position switch to select different operation modes (FM Dolby, playback, record). Tone control galore: independent bass, mid, treble for front & rear channels, plus filter switches (high-cut, low-cut) and loudness compensation. Robust build: damping factor around 40–50 (depending on mode) for tight speaker control. Substantial chassis — heavy, premium metal construction, measuring 490 × 146 × 386 mm and weighing in at about 23–24 kg (≈ 51.6 lb). Wide input options (phono, AUX, tape), plus plenty of output flexibility — folks have reported using this with both 2-channel and 4-channel speaker setups. Historical & collector appeal: Released with a list price of US$1,250, positioning it as a serious audiophile instrument. Designed for quadraphonic systems, but also highly musical in stereo — an ideal choice for both vintage vinyl lovers and 4-speaker enthusiasts. Because of its age and engineering sophistication, it's also collectible — especially when paired with the optional wood cabinet or original quad decoders. --- Bottom Line If you're after a powerful, versatile, and visually striking vintage receiver that delivers serious audio performance — whether in stereo or quad — the Marantz 4400 is a standout. It combines raw output, flexible quad decoding, full tone controls, and a captivating oscilloscope into a single, iconic unit. She has had the LED upgrade all switches and knobs professionally cleaned and tested. Shes georgious and needs the Right home for Christmas. The quad sd card is installed it simply doesnt get better than this. Please note though all caps and resistors were checked for compliance and passed. This does not mean she cannot have problems or still need work in the future. Please understand that this is a vintage electronic item and will need ongoing technical care to safeguard her internals and protect hour investment. There are no garantees on vintage electronics. Please see pictures for details of condition as they form part of the sale. We will pack her with our custom double box and bubble wrap system and we pack for the safety of the item not for economy