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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a set of IR headphones with a genuinely wide, flat-leaning frequency response for airplane and road-trip movie watching, choose Rockville RFH3; if you need a three-headset kit for a full family in the back seat, choose Key Audio RP Accessories IR-601B.
• Rockville RFH3 — biggest strength: a 40mm Mylar dome driver rated 17–23,000 Hz with 32-ohm impedance and 96 dB sensitivity, which is the wider and more even-looking response of the two on paper.
• Rockville RFH3 — biggest trade-off: it runs on two AAA batteries you have to supply yourself, and the auto-mute/auto-off system is what stretches that runtime to a claimed 48 hours.
• Key Audio RP Accessories IR-601B — biggest strength: you get three folding over-ear headsets in one box, plus a 3.5 mm jack so they can pull double duty at home with a separate IR transmitter.
• Key Audio RP Accessories IR-601B — biggest trade-off: its rated range is 20 Hz–20,000 Hz, the standard consumer spec, so it gives up a little of the RFH3's top-end extension on paper.
• Pick Rockville RFH3 if clean, even-sounding audio and dual A/B channel switching matter most to you.
• Pick Key Audio RP Accessories IR-601B if you're outfitting three passengers and want the simplest possible setup.
The RFH3 is the pick for someone who treats in-car audio as more than background noise. The headline number is its frequency range: 17 Hz up to 23,000 Hz. That's wider than the usual 20 Hz–20,000 Hz ceiling you see on most consumer headphones, and it tells you Rockville tuned these to reach lower into the bass and higher into the treble without rolling off early. Combined with 32-ohm impedance and 96 dB sensitivity, the design suggests a driver that's easy to push loud and stays controlled across the range — the kind of flat frequency response headphones that keep dialogue clear in a movie mix instead of muddying it under boosted bass.
Rockville builds in a real 40mm Mylar dome speaker for each earcup. In plain terms, a larger driver with a stiff dome material tends to hold its shape better at high volume, which is exactly what you want when a car cabin is noisy. The dual A/B infrared channels are the other reason to choose this set: two people can each lock onto a different source — one watching a DVD on a headrest screen while the other listens to a game console — and neither has to compromise.
For airplane use specifically, the RFH3's physical design is what sells it: over-ear leatherette pads, a lightweight 160 g body, and a foldable hinge that tucks the whole thing into a seatback pocket or glovebox. It's a wired-free, packable set of on ear headphones for airplane travel that won't fight you when you're cramming a carry-on shut.
Key Audio RP Accessories IR-601B: Who It's For
The IR-601B is the family-logistics answer. This is a set of three, and that changes the math entirely if you've got kids in the back row who all want headphones at once. Key Audio markets it hard at the rear-entertainment crowd, and the feature list backs that up: dual 2-channel IR so one passenger can watch a movie on the first monitor while another tunes to a different program on the second screen, plus an automatic shutoff to stop drained batteries when the headsets get tossed aside mid-trip.
What stands out beyond the headcount is the 3.5 mm jack. That's unusual for an infrared set, and it means the IR-601B isn't locked to the car. Add a separate IR transmitter at home — the sheet is explicit that it isn't included — and you can watch late-night TV without waking anyone, or use the jack for a wired connection. The over-ear, around-ear fit and folding design make storage easy, and the plastic enclosure keeps the weight reasonable for a three-pack.
The honest limitation is the audio spec. Key Audio rates the dynamic driver at 20 Hz–20,000 Hz, which is the conventional consumer range. That's perfectly respectable for movies and TV, but it's narrower than the RFH3's 17–23,000 Hz on paper, so if your priority is the flattest, widest response you can get in an IR headset, this isn't the one. Noise control here is listed as sound isolation rather than active cancellation — it passively blocks some cabin noise, it doesn't generate a canceling signal.
Who should buy it: parents who need three working headsets today with minimal fuss, and anyone who wants a set that can leave the car and work at home. Who should skip it: the buyer chasing the most refined, widest-frequency sound, or someone who needs just one or two headsets and doesn't want the extra unit.
• Best for flattest, widest frequency response → Rockville RFH3. Its 17–23,000 Hz rating is broader than the IR-601B's 20–20,000 Hz.
• Best for outfitting a whole family → Key Audio RP Accessories IR-601B. Three headsets versus two in the box.
• Best for battery simplicity → Rockville RFH3. It runs two AAA cells per headset, and auto-mute/auto-off stretches runtime to a claimed 48 hours.
• Best for dual-source listening → Rockville RFH3. True A/B dual-channel IR lets two users split onto separate sources, which is ideal for dual-screen headrest systems.
• Best for home use too → Key Audio RP Accessories IR-601B. The 3.5 mm jack is the tie-breaker if you want these to double as TV headphones with a separate transmitter.
• Best for lightweight travel packing → Rockville RFH3. At 160 g with leatherette pads and a foldable frame, it's built to disappear into a seatback pocket.
• Best for the least fiddly setup → Key Audio RP Accessories IR-601B. Key Audio emphasizes quick, stable connections to most in-car IR transmitters — useful for kids operating them alone.
• Best for noise handling → Rockville RFH3. It lists active noise cancellation, while the IR-601B relies on passive sound isolation.
For airplane and road-trip movie watching, I'd buy the Rockville RFH3. The reason is the audio design: a 40mm Mylar dome driver rated 17–23,000 Hz with 32-ohm impedance and 96 dB sensitivity is the more serious spec sheet, and if flat, even frequency response is what you're after, that's where it lives. The dual A/B channels and the foldable, 160 g frame make it a genuinely travel-friendly set of in ear headphones for airplane and rear-seat use.
The IR-601B is the better buy in exactly one scenario: you need three headsets, you want them to work at home through a 3.5 mm jack, and you'd rather not think about it. If that's you, take the Key Audio set without hesitation. Otherwise, the RFH3 wins on sound.
One caveat before you commit: I'm working from the spec sheets here, and neither brand publishes pricing in a form I can quote. Check the current price on Amazon using the button on this page before you decide.
Yes — it describes the range of pitches a driver can reproduce. The RFH3 covers 17–23,000 Hz and the IR-601B covers 20–20,000 Hz, so the Rockville extends slightly lower in bass and higher in treble. For movie dialogue and effects, both are plenty; the RFH3's wider band is the reason I lean toward it for flatter, more even sound.
Both the RFH3 and the IR-601B are over-ear designs with folding frames, which makes them easy to pack. In-ear models are more compact, but over-ear leatherette pads like the RFH3's tend to isolate cabin noise better on their own. For airplane travel, a foldable over-ear set is the more practical pick.
Both connect over infrared and are described as compatible with most factory and aftermarket IR-equipped systems. You need an IR transmitter in the vehicle — the IR-601B's is explicitly not included, and the RFH3 likewise pairs with your existing car IR setup. If your car has no IR transmitter, neither will work.
The Rockville RFH3 ships as a two-pack and runs on two AAA batteries per headset, which you supply. The Key Audio RP Accessories IR-601B ships as a set of three and includes automatic shutoff to conserve battery. Choose by headcount first, then by sound.
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