We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-20 · 7 min read · Independent comparison
If you want a wired in-ear monitor with a four-driver balanced-armature engine, a three-way crossover and a seriously light low-resistance cable, choose Westone Audio; if you need an affordable analog 3.5mm earphone for gaming, studio work and long sessions on PC, console or handheld, choose Generic Sonicast direm E3.
• Westone Audio — biggest strength: a four balanced-armature driver system with dual lows, a single mid and a single high, split by a 3-way passive crossover. That is a deliberate, layered design rather than a single full-range driver doing everything at once.
• Westone Audio — biggest trade-off: it is a specialist tool. You are paying for tuning and driver architecture, not for extras like an inline mic, and the 3.5mm wired connection keeps you tethered.
• Generic Sonicast direm E3 — biggest strength: analog high-resolution audio over a plain 3.5mm jack with no DAC required, plus a fabric-wrapped tangle-resistant cable. It is built to plug into whatever you already own.
• Generic Sonicast direm E3 — biggest trade-off: a single SF-DRIVER handles the entire frequency range, so you get one driver's compromise instead of four drivers sharing the load.
• Who each pick is for: Westone Audio suits the listener chasing an even, fatigue-free monitoring sound; the direm E3 suits the gamer, streamer or creator who wants one cable that works everywhere.
The MACH 40 is, on paper, a monitoring instrument. Four balanced-armature drivers are divided into dual lows, a single mid and a single high, and a 3-way passive crossover hands each band its own driver. That architecture is the whole point: instead of asking one driver to cover everything, the bass, midrange and treble are each handled by a purpose-assigned unit. The result, as the spec sheet frames it, is a soundstage described as balanced and smooth — an even listening experience rather than a hyped one.
The numbers back that up as a monitoring tool. Frequency response runs 10Hz to 20kHz, sensitivity is 100dB at 1kHz, and impedance sits at 30 Ohms. That impedance figure matters in practice: 30 Ohms is easy enough to drive that a phone, laptop or interface will get usable volume without a dedicated amp, but it is also a load that responds well to decent sources. Passive noise cancellation is handled by the sealing in-ear fit rather than electronics, and Westone calls out an ergonomic shape intended for all-day use with no ear fatigue. If you wear monitors for hours — mixing, rehearsing, editing — that claim is the one to care about.
In the box you get a 50-inch (127cm) Linum SUPERBaX T2 cable rated at just 0.75 Ohms resistance, five pairs of foam tips and five pairs of silicone tips, an impact-resistant Pelican case, a cloth pouch, a cable band and a cleaning tool. That is a complete kit, and the tip selection is genuinely useful because fit is what makes or breaks an IEM. The shell warranty runs two years. Who should skip it? Anyone who needs an inline mic for calls, anyone who wants wireless freedom, and anyone who only ever listens casually on a phone with no interest in tip-rolling. This is a listener's earphone, not an all-purpose headset.
The direm E3 plays a different game. Its centerpiece is a single-unit acoustic driver called SF-DRIVER, which Sonicast positions as a next-generation engine delivering detail, dynamics and balance across all frequencies. Around that driver sit two named tuning technologies — ORZA acoustic tuning and GAMIN calibration — described as fine tonal-control methods for precise frequency shaping. You do not get a driver count here; you get one driver plus heavy tuning intent. That is a legitimate design philosophy, and for plenty of listeners a well-tuned single driver is easier to live with than a crossover network.
The connection story is the real selling point. This is a pure analog 3.5mm earphone with no DAC required and no digital conversion in the path — the pitch being honest, uncolored reproduction straight from the jack. That makes it a natural fit for a PC, laptop, PS5, Switch or Steam Deck, all of which the listing names directly. Add a flexible, tangle-resistant fabric-wrapped cable and an ergonomic in-ear shape built for long listening sessions, and you have something designed to survive being stuffed in a bag and plugged into a controller.
It is also marketed toward creators, musicians and engineers, with a reference-standard tuning claim and noise isolation from the in-ear seal rather than active processing. Who should skip it? Buyers who specifically want multi-driver separation and a crossover, or who want a premium hard case and a deep tip assortment out of the box — the E3 ships with a user manual and a one-year manufacturer warranty, and that is the extent of what the data sheet confirms. If you want a full accessory kit, this is not it.
• Best for driver architecture and separation → Westone Audio. Four balanced-armature drivers with a 3-way passive crossover versus a single full-range SF-DRIVER.
• Best for plug-and-play across devices → Generic Sonicast direm E3. Analog 3.5mm, no DAC needed, explicitly aimed at PC, laptop, PS5, Switch and Steam Deck.
• Best for all-day comfort claims → Westone Audio, whose ergonomic design is explicitly stated to allow all-day use with no ear fatigue.
• Best for cable durability on the move → Generic Sonicast direm E3, thanks to its fabric-wrapped, tangle-resistant cable.
• Best for tip fit and accessories → Westone Audio. Five pairs of foam plus five pairs of silicone tips, a Pelican case, pouch, cable band and cleaning tool.
• Best for warranty length → Westone Audio, with a two-year warranty covering the shell and internal components versus a one-year manufacturer warranty.
• Best for a single-cable do-everything setup → Generic Sonicast direm E3. Gaming, streaming and studio listening from one 3.5mm plug.
• Best for critical, even monitoring → Westone Audio, given its 10Hz–20kHz response, 100dB sensitivity and 30 Ohm impedance.
In my opinion, the Westone Audio MACH 40 is the pick if your goal is genuinely even, fatigue-free monitoring and you value a proper multi-driver crossover plus a full accessory kit and a two-year warranty. The direm E3 is the pick if you want one analog 3.5mm earphone that works with your console, handheld and laptop, with a cable that survives daily abuse. If I had to choose one for myself, I would take the Westone for listening and mixing, because the four-driver, 3-way design is the more specialized instrument. If gaming and cross-device convenience came first, I would take the direm E3 without hesitation.
They solve different problems. The MACH 40 gives you four balanced-armature drivers, a 3-way crossover and a full tip/case kit. The direm E3 gives you a single SF-DRIVER, analog 3.5mm and a durable fabric cable. Worth depends on whether you want driver separation or device flexibility — check the current price on Amazon for both.
Which one is better for gaming on PS5 or Steam Deck?
The data sheet does not list an inline microphone or media control for the E3 — it ships with a user manual only. The Westone MACH 40 lists a media control with touch operation, but not a microphone either. If calls matter, neither is confirmed for that.
Both rely on passive isolation from the in-ear seal rather than active noise cancellation. The Westone gives you five pairs of foam and five pairs of silicone tips, so you have more chances to find a sealing fit. The direm E3 lists an ergonomic in-ear design but no tip count, so fit will depend on what ships in the box.
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