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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want to repair or rebuild a pair of headphones around genuine titanium drivers, choose Rillpac 1; if you need a complete wireless pair you can wear out of the box, choose Gabba Goods Over-Ear Headphones. These two listings look similar on paper — both center on a 40mm driver — but they are not the same kind of product at all. One is a pair of raw speaker units for a DIY project. The other is a finished Bluetooth headset. Figuring out which one belongs in your cart takes about thirty seconds once you understand that difference.
• Rillpac 1 — biggest strength: A pair of original-spec 32Ω, 40mm titanium full-range drivers with front covers, built as replacement parts for the Onkyo ES-FC300, with a quoted 10Hz–27kHz frequency response and 97dB/mW sensitivity.
• Rillpac 1 — biggest trade-off: It is not a finished product. There is no cable, no housing, no headband, no battery, no Bluetooth. You supply the headphones, or you build them.
• Gabba Goods Over-Ear Headphones — biggest strength: A complete wireless over-ear headset with Bluetooth 5.4, a built-in mic, FM radio, SD card playback, and USB-C charging — ready to use with no assembly.
• Gabba Goods Over-Ear Headphones — biggest trade-off: The battery is rated for up to 6 hours per charge, which is modest for a wireless headphone, and the drivers are tuned for a bass-forward, consumer-friendly sound rather than reference detail.
• Who each pick is for: Rillpac 1 is for tinkerers, repairers, and DIY builders. Gabba Goods is for anyone who just wants to put headphones on and press play.
Rillpac 1 is a 2-count pack of 40mm dynamic titanium speaker drivers rated at 32Ω, with a stated frequency response of 10Hz–27kHz, 97dB/mW output sound pressure level, and a maximum input power of 1000mW. Each unit measures roughly 1.57 x 1.57 x 0.39 inches and weighs about 0.07 kg for the pair. The listing describes them as original replacement speakers for the Onkyo ES-FC300, and they ship with the original front cover included. The design story behind those drivers is worth knowing: aluminum housings, dual chambers behind the driver to control resonance, and tuning aimed at clean mid and high detail rather than boosted low end. The spec sheet talks about bass as a matter of control and weight rather than sheer quantity.
Who should skip it? Almost everyone who isn't repairing or building. There is no cable, no ear cups, no headband, no microphone, no battery — nothing that makes sound on its own. The listing is also upfront that if you want to mount these in your own housing, you have to disassemble the speakers from the plastic cover yourself, and it recommends a professional repair shop if you're not confident doing the work. It carries a 3-month warranty on the part. Treat this as a component, not a product.
Gabba Goods Over-Ear Headphones: Who It's For
Gabba Goods Over-Ear Headphones are the opposite proposition: a finished, wearable, wireless headset in beige, with fabric, silicone, and plastic in the build and an over-ear fit. The 40mm speaker unit is paired with 32Ω impedance and a 20Hz–20kHz frequency range, tuned for what the listing calls deep bass, crisp highs, and rich mids. Bluetooth 5.4 handles wireless playback with a stated 10-meter range, and there's a built-in microphone for calls.
The feature list is unusually broad for this class. Beyond Bluetooth streaming, you get FM radio and SD card playback as alternate modes, so you can listen without a phone at all. Controls sit on the ear cup: multi-function buttons for volume, track skipping, answering calls, and switching modes. A 150mAh lithium-ion battery is rated for up to 6 hours of playback or calls, recharging in about 1.5 hours over USB-C. You also get LED charging indicators, low-battery voice prompts, and a foldable design for travel. The age range spans child, teen, and adult, and the packaging is described as eco-conscious.
This is for the commuter, the student, the gym-goer, the person who wants one pair of headphones that does music, calls, and radio without extra gear. It's also a sensible pick for a teenager or a first wireless headphone, given the folding build and simple on-cup controls. The trade-off is honest: 6 hours is not all-day battery life, so a long workday or a full travel day likely means a mid-day charge. And "deep bass" tuning means this is a fun, consumer sound, not a neutral monitor. If you want reference-grade midrange detail, the spec sheet here doesn't promise it.
• Best for repairing existing Onkyo ES-FC300 headphones → Rillpac 1. These are the original replacement drivers for that model.
• Best for a DIY headphone build with published specs → Rillpac 1. 32Ω, 97dB/mW, 10Hz–27kHz, and a 1000mW power ceiling give you real numbers to design around.
• Best for wireless convenience → Gabba Goods. Bluetooth 5.4 with a stated 10-meter range, plus a built-in mic.
• Best for listening without a phone → Gabba Goods. FM radio and SD card playback mean no pairing required.
• Best for battery life → Gabba Goods. Up to 6 hours, though note Rillpac 1 has no battery at all — it's a passive component.
• Best for travel and everyday wear → Gabba Goods. Foldable design, on-cup controls, and a 0.57 kg all-in weight versus a bare driver pair.
• Best for extended frequency reach on paper → Rillpac 1. Its stated 10Hz–27kHz range extends further at both ends than the 20Hz–20kHz range listed for Gabba Goods, though implementation matters as much as the number.
• Best for a project you can finish today → Gabba Goods. Nothing to assemble, nothing to solder, nothing to disassemble.
In my opinion, most people searching this comparison should buy the Gabba Goods Over-Ear Headphones. It's a complete product — wireless, with a mic, three playback modes, and a foldable frame — and it works the moment you unbox it. I'd only point you to Rillpac 1 if you specifically own an ES-FC300 that needs new drivers, or you're deep enough into DIY that a bare 40mm titanium driver pair with front covers is exactly what your project is missing. Those are two very different shoppers, and I'd rather you buy the right one than the "better" one. If budget is your deciding factor, check the current price on Amazon for both before you commit — the page has a button for that.
what is 40mm driver in headphones
A 40mm driver is the speaker unit inside the ear cup, measured across its diameter. It converts electrical signal into sound, and the 40mm size is a common middle ground — large enough to move decent air for bass, small enough to keep over-ear headphones light.
what are 40mm drivers in headphones
They're dynamic speaker units, usually with a diaphragm, voice coil, and magnet assembly. Both products here use 40mm units: Rillpac 1 sells them as bare replacement parts with titanium diaphragms, while Gabba Goods builds them into a finished wireless headset.
which driver is best for headphones
There's no single best size. Larger drivers can move more air for stronger bass, smaller ones can be lighter and faster. What matters more is tuning and housing design — which is why Rillpac 1's listing emphasizes dual chambers and resonance control rather than driver size alone.
is 40mm driver good for headphones
Yes, for most everyday listening. A 40mm dynamic driver is a well-established choice for over-ear and on-ear headphones. Both the Rillpac 1 replacement units and the Gabba Goods headset use this size, so the difference between them comes down to how each is built and what you need.
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