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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want an open-back, wired headphone built for long indoor listening sessions with a wide, airy presentation, choose Philips Audio SHP9500; if you need a wireless, ultra-light on-ear you can wear on the move with a 20+ hour battery, choose Koss Porta Pro.
• Philips Audio SHP9500 — biggest strength: Open-back 50mm neodymium drivers with a 12–35,000 Hz range, low 32 Ohm impedance, and a removable 1.5m cable for wired indoor listening.
• Philips Audio SHP9500 — biggest trade-off: It is wired only, with no Bluetooth, no microphone, and no active noise control, and the open-back design leaks sound in and out.
• Koss Porta Pro — biggest strength: Bluetooth 5.2 wireless with a 20+ hour battery, USB-C charging, on-board mic and controls, plus analog audio pass-through as a wired fallback.
• Koss Porta Pro — biggest trade-off: On-ear fit with a narrower 15–25,000 Hz range and 60 Ohm impedance, so it is less suited to stationary critical listening than an over-ear open-back.
• Who each pick is for: Philips Audio SHP9500 for desk and home listeners who want an over-ear open-back; Koss Porta Pro for commuters and travelers who want wireless freedom in a light on-ear package.
The SHP9500 is a wired, over-ear headphone with an open acoustic system. That single design choice shapes everything about it. Open-back cups let air move behind the 50mm neodymium drivers, which is the architecture typically associated with a more spacious, less closed-in presentation and a smooth top end. The driver spec backs this up on paper: a 12–35,000 Hz frequency range, 101 dB sensitivity, and 32 Ohm impedance.
That 32 Ohm impedance is the practical headline for most buyers. Low impedance means the SHP9500 is easy to drive from ordinary sources — a laptop headphone jack, a desktop, a dongle, a portable player — without needing a dedicated headphone amplifier. If you already own audiophile-grade gear, the included gold-plated 3.5–6.3mm adapter lets you plug into a quarter-inch output. Either way, you are not forced into buying extra electronics to get reasonable volume.
Comfort is clearly a design priority. The spec sheet calls out a double-layered headband cushion and breathable ear cushions, which matters because this is a headphone you wear for hours at a desk. The enclosure is steel, the earpads are over-ear with a rounded tip shape, and the whole thing weighs 0.3 kg. The cable is removable and measures 1.5m — long enough to reach across a desk, short enough that it will not tangle around your chair.
Who should buy it: home and desk listeners who want an over-ear open-back for long sessions, people who prefer wired audio for its simplicity and lack of charging, and anyone whose source gear is basic rather than high-end. Who should skip it: anyone who needs wireless, anyone who needs a built-in microphone for calls, and anyone who listens in a noisy or shared space — an open-back design does not isolate, and it leaks audio outward.
The Porta Pro is the opposite philosophy. It is an on-ear headphone in a retro 80s style, and this version is wireless. Bluetooth 5.2 handles the connection with a stated range of up to 10 meters, and the headline number is battery: 20+ hours of listening or talk time, with USB-C charging and a 20-hour charge time figure listed. That combination — long runtime plus USB-C — means you charge it occasionally rather than constantly, and you do not need to hunt for a proprietary cable.
The interesting engineering detail here is the headband. Koss describes a patent-pending dual steel headband that transmits the audio signal without wires, which is how the brand preserves the original Porta Pro fit and look while going wireless. The drivers are 60 Ohm dynamic drivers with a 15–25,000 Hz frequency range and 101 dB sensitivity, tuned per the description for deep bass, crisp highs, and a strong midrange.
Everyday control is built in. There is an integrated microphone plus on-board audio controls for volume and track control, so you can take calls and manage playback without touching your phone. The controls are push-button. If the battery runs out or you want a wired connection, analog audio pass-through lets you run it with a 3.5mm jack. It also ships with a cable and a protective case, and at 0.19 kg it is noticeably lighter than the Philips.
Who should buy it: commuters, walkers, and travelers who want wireless convenience; anyone who takes calls from their headphones; people who want a light, compact on-ear they can carry in the included case. Who should skip it: critical listeners who want a wide open-back presentation, and anyone who dislikes on-ear pressure — on-ear pads sit against the ear rather than around it, which some people find less comfortable over very long sessions than an over-ear design.
• Best for wireless freedom → Koss Porta Pro. Bluetooth 5.2 with up to 10 meters of range, versus a wired-only connection on the Philips.
• Best for long desk sessions → Philips Audio SHP9500. Over-ear breathable cushions, a double-layered headband pad, and a 1.5m removable cable suited to indoor use.
• Best for battery life → Koss Porta Pro. 20+ hours of listening and talk time with USB-C charging. The Philips has no battery to manage at all.
• Best for calls and on-the-go control → Koss Porta Pro. Integrated microphone plus push-button volume and playback controls. The Philips has none of these.
• Best for open, spacious sound → Philips Audio SHP9500. Open acoustic system with angled 50mm drivers and a 12–35,000 Hz range.
• Best for portability → Koss Porta Pro. 0.19 kg on-ear with a protective case included, versus 0.3 kg over-ear on the Philips.
• Best for easy driving from basic gear → Philips Audio SHP9500. 32 Ohm impedance is friendlier to phones and laptops than the Koss's 60 Ohm.
• Best for flexible wired-or-wireless use → Koss Porta Pro. Bluetooth by default, with analog audio pass-through and a 3.5mm jack when you want it.
In my opinion, the right pick comes down to where you listen, not which headphone is "better." If your listening happens at a desk or in a quiet room and you value an over-ear open-back with low impedance and no battery to think about, I would buy the Philips Audio SHP9500. If you listen while moving, take calls, and want wireless with a 20+ hour battery and a wired fallback, I would buy the Koss Porta Pro. They solve different problems, and neither one replaces the other.
It is wired only. It uses a 3.5mm jack with a removable 1.5m cable, and there is no Bluetooth, no battery, and no microphone listed in its specs.
Yes. It has an integrated microphone plus on-board push-button controls for volume and playback, and it is rated for 20+ hours of listening and talk time.
They are built for different things. The Philips pairs an open-back design with 50mm drivers and a 12–35,000 Hz range for a spacious presentation; the Koss uses 60 Ohm drivers at 15–25,000 Hz and is tuned for deep bass and crisp highs in a portable format. Which you prefer depends on whether you listen at a desk or on the move.
Yes. It supports analog audio pass-through through a 3.5mm jack, and it ships with a cable and a protective case, so you can run it wired if the battery is empty or you simply prefer a cable.
If you want one headphone for everything, the Koss Porta Pro covers more situations because it is wireless with a wired option. If you want one headphone purely for home listening, the Philips Audio SHP9500 is the better fit. Check the current price on Amazon for each before deciding.
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