Magnepan 3.7i Planar Magnetic Speakers

The Magnepan 3.7i is a full-range, three-way planar-magnetic speaker built around a 60.6-inch true ribbon tweeter sitting over quasi-ribbon bass and midrange panels. The midrange and bass run on separate diaphragm sections, which cuts crosstalk between the drivers, and the whole panel reaches 35Hz to 40kHz. Sound comes from thin diaphragms suspended in a magnetic field, not cones in a box, which is where the open, see-through Magnepan presentation comes from.

Positive Feedback calls the 3.7i "a noticeable improvement over the 3.7 and a true value for the money." Magnepan hand-builds every 3.7i to order in your choice of finish, and as the largest Magnepan dealer in the United States, we often find your combination already on hand at Magnepan.

Key Features of the Magnepan 3.7i

• 60.6-Inch True Ribbon Tweeter: Pure aluminum foil suspended freely with no substrate. Magnepan uses its ribbon tweeter in the 3.7i and the 20.7.
• Midrange and Bass on Separate Diaphragms: Support structure behind the Mylar lets one sheet behave as two independent radiators, improving separation and reducing distortion.
• Quasi-Ribbon Bass and Midrange: Aluminum foil bonded to a Mylar diaphragm, the "quasi-ribbon" surface visible through the front of the grille cloth.
• Dipole Planar Design: Radiates from both the front and back of the panel, the trait behind Magnepan's open, room-filling soundstage.
• Tall, Slim Panel: 71 inches tall and just 1.625 inches deep.
• Made in the USA: Hand-built at Magnepan's factory in White Bear Lake, Minnesota.
• 24 Finish Combinations: Four grille fabrics and six trim options, so the panel matches the room rather than fighting it.

How the Magnepan 3.7i Makes Its Sound

The Magnepan 3.7i is a three-way dipole rated at 4 ohms and 86dB sensitivity (2.83V). The bass and midrange are quasi-ribbon panels, aluminum foil adhered to a Mylar diaphragm, and they run on separate diaphragm sections of the same sheet, so each behaves as its own radiator. The tweeter is a 60.6-inch true ribbon: a strip of aluminum foil suspended freely with no substrate behind it, so the conductor itself is the diaphragm. Magnepan also uses its true ribbon tweeter in the 20.7. All three sections radiate front and back as a dipole, for low stored energy and the open, unboxed sound Magnepan is known for. Like every Magnepan, the 3.7i rewards a strong, current-capable amplifier.

What the 3.7i's Longer Ribbon and Bigger Panel Deliver

Stepping up to the 3.7i is about what the longer ribbon and the larger panel give you, not a room measurement. The 60.6-inch ribbon extends the top end to 40kHz with more air, sparkle, and effortless detail than the 40-inch ribbon below it, and the added radiating area means a bigger soundstage with more output before the panel works hard. The separate midrange and bass diaphragms keep the two ranges from smearing into each other, so dense music stays sorted. Choose the 3.7i when you want the most resolution and scale in the i-series. Like any dipole it rewards a little space behind it to open up, but that is a setup detail to dial in, not a limit on who it is for.

How Much Bass Does the Magnepan 3.7i Have?

The Magnepan 3.7i reaches down to 35Hz from its panel, the deepest of the i-series, with the speed and coherence that come from making bass on the same kind of thin diaphragm as the mids and highs. Like any panel, it stays lean in the lowest octave rather than thumping, so for full weight under organ, synth, and film, a fast, articulate subwoofer fills in the bottom without dragging on the panel's speed. We most often pair Magnepan with REL and Perlisten subwoofers, since both blend cleanly with a planar rather than fighting it.

Fabric and Trim Options for the Magnepan 3.7i

The Magnepan 3.7i is built to order in four grille fabrics (Black, Off White, Cherry White, and Dark Grey) and six side-trim finishes (Natural Oak, Black Oak, Dark Cherry, Black Aluminum, Silver Aluminum, and Gold Aluminum). That gives 24 combinations, from an all-black panel that hides in a media wall to natural oak rails that warm up a living space. Fabric and trim are a cosmetic choice and do not change the sound. Each pair ships with Magnepan's oval bases.

Magnepan Trade-In Program

We offer trade-up credit of up to 85% of your original purchase price toward a more expensive Magnepan up the line, handled personally and case by case. See our trade-in terms for details.

The Listening Room Difference

We're a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on exceptional service and relentless passion for hifi. Whether you're visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction. We don't just ship boxes. We help build systems, answer your questions like real humans, and make sure every detail of your setup is right, from the cables to the final connection. Our passion is helping you get the most out of your gear, with support that lasts well beyond the sale.

Magnepan 3.7i Specifications

Explore the rest of the Magnepan Standard Series (.7 · 1.7i · 2.7i · 3.7i · 20.7 · 30.7), or step up to the upgraded X-Series.