How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-27 · 6 min read · Independent comparison
• Linsoul Kiwi Ears Septet — biggest strength: A seven-driver quadbrid design (dynamic, four balanced armatures, planar, and PZT) with an open-back in-ear shell, a 5-way crossover, and a modular 3.5mm/4.4mm cable for portable accuracy.
• Linsoul Kiwi Ears Septet — biggest trade-off: It's an in-ear monitor, so it's one pair of tiny earphones — no speakers, no over-ear cups, and it relies on a wired source.
• Audiosavings Presonus Eris Studio — biggest strength: A three-piece bundle: open-back AKG K701 over-ear headphones plus two 8-inch, 140W powered Eris Studio 8 monitors with acoustic tuning controls.
• Audiosavings Presonus Eris Studio — biggest trade-off: It's a stationary rig. The speakers need power and desk space, and the headphones have a fixed cable.
• Who each is for: Pick the Septet if you want one portable open-back IEM that doubles as a precision tool. Pick the Audiosavings bundle if you're building a home studio desk and want monitors and open-back headphones in one box.
The Septet is an in-ear monitor, but it's not a casual pair of earbuds. It packs seven drivers across four types into each shell: a 10mm composite dynamic driver for sub-bass, four balanced armatures covering low-mid and mid-treble, a micro planar transducer handling ultra-treble, and an updated PZT driver adding upper-register texture. A 5-way passive crossover and a three-bore nozzle split the work so each driver group stays in its lane. The result, per the spec sheet, is a hybrid that reaches from 8Hz up to 30kHz.
The open-back design is the headliner here. Instead of sealing your ear canal off from the world, the shell vents every driver, which the maker says adds airflow, responsiveness, and an "acoustic" texture while widening the soundstage. This is the same principle behind open-back over-ear headphones, just shrunk down to an IEM. Impedance sits at 15 ohm with 95dB sensitivity, and the included modular cable switches between 3.5mm unbalanced and 4.4mm balanced plugs.
Buy it if you're a musician, engineer, or audiophile who wants an open, airy presentation in something that fits in a pocket — and you value the flexibility of swapping between single-ended and balanced sources. Skip it if you need over-ear cups, a sealed isolation-first monitor, or speakers for a room. The passive noise cancellation here is minimal by design; open-back means you hear your surroundings.
This bundle is a different animal entirely. You get three items: one pair of AKG K701 open-back over-ear reference headphones and two Presonus Eris Studio 8 powered monitors. The K701 is a classic open-back over-ear design with a 62-ohm impedance, 105dB SPL/V sensitivity, a 10–39,800Hz bandwidth, and a fixed 3m cable that terminates in a 3.5mm plug with a screw-on 1/4-inch adapter. At 235g, it's built for long mixing sessions, and its stated applications are studio mixing and hi-fi listening.
The Eris Studio 8 speakers are the real anchor of the set. Each has an 8-inch woven composite woofer and a 1.25-inch silk-dome tweeter, bi-amplified to 140W Class AB, with a 35Hz–20kHz response and a front-firing port. The EBM waveguide spreads sound 100° horizontally and 60° vertically. What makes them studio tools rather than party speakers is the tuning: continuously variable ±6dB high-frequency and midrange controls, an acoustic-space switch (flat, -2, -4dB), and a highpass filter at 80Hz or 100Hz. Inputs cover balanced XLR and 1/4-inch plus unbalanced RCA, and there's built-in protection against RF interference, overheating, and transients.
Buy it if you're setting up a mixing or mastering desk and want open-back headphones for detail work plus speakers for room-level reference — and you want tuning controls to compensate for your space. Skip it if you need something portable, or you only want one listening tool. This is a desk-bound, powered setup.
• Best for open-back listening on the go → Linsoul Kiwi Ears Septet. It's the only portable option; the Eris bundle's headphones are over-ear and its speakers need a wall outlet.
• Best for a complete studio desk → Audiosavings Presonus Eris Studio. Two powered monitors plus reference headphones cover both near-field and headphone monitoring.
• Best for cable flexibility → Linsoul Kiwi Ears Septet. Modular 3.5mm/4.4mm plugs beat the K701's fixed 3m cable.
• Best for driver complexity in a single earpiece → Linsoul Kiwi Ears Septet. Seven drivers and a 5-way crossover in each IEM is remarkable density.
• Best for low-end extension → Audiosavings Presonus Eris Studio on paper. The 8-inch woofers reach to 35Hz; the Septet claims 8Hz but from a tiny dynamic driver, so the character differs.
• Best for impedance-friendly pairing → Linsoul Kiwi Ears Septet at 15 ohm. It's easy to drive from almost any source, where the 62-ohm K701 wants a bit more headroom.
• Best for buying one thing and being done → Linsoul Kiwi Ears Septet. The bundle is three items and a bigger commitment.
My Verdict
If I had to pick one, I'd buy the Linsoul Kiwi Ears Septet. In my opinion, it delivers the most open-back character per dollar of commitment — a genuinely unusual quadbrid design, a proper crossover, and a modular cable, all in something you can carry. The Audiosavings Presonus Eris Studio bundle is excellent if you're furnishing a studio and want speakers and headphones together, and its tuning controls are a real advantage in an untreated room. But it's a stationary setup, and the Septet's open-back IEM concept is the more distinctive, flexible pick for most listeners. Check the current price on Amazon before deciding.
Open-back headphones have vented cups or shells that let air move freely around the driver instead of sealing it in. That airflow tends to widen the soundstage and give a more natural, speaker-like presentation. Both products here are open-back: the Septet is an open-back in-ear monitor, and the AKG K701 in the Audiosavings bundle is an open-back over-ear.
Are open back headphones better?
The driver sits in a housing with openings that let air escape rather than trapping it. That reduces the pressure buildup a sealed cup creates and lets the diaphragm move more freely, which is why open-back models often sound airier. The Septet applies this to an in-ear shell, while the K701 applies it to over-ear cups.
"In my opinion, the best open-back pick depends on form factor. For a portable open-back IEM, I recommend the Linsoul Kiwi Ears Septet. For a desk setup that pairs open-back over-ear headphones with powered studio monitors, I recommend the Audiosavings Presonus Eris Studio bundle. Match the form factor to where you actually listen.
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