Do these use same speakers as Porta Pros?

Officially, I have never seen Koss admit that Kph40 and Porta Pros have the same driver. But having both, I tested them on a Steely Dan song "Lunch with Gina" and I can't tell any difference in the sound. So I think it comes to which head band you prefer, the folding Porta Pros or the single band 40.

Where can you buy a balanced cable for the KPH40 utility headphones?

Just got mine KPH40 and checked the cable. It seems that 2.5mm TRRS socket is indeed balanced, but configured in 3.5mm standard (T: R+, R: L+, R: L-, S: R-). So it's NOT compatible with 2.5mm balanced output (like FIIO BTR5) using "straight" cable. You would have to use crossed cable for this setup (haven't found one yet), or use device with 3.5mm balanced standard.

Does anyone know when these will be back in stock? I would love to get a pair! :-)

I Believe these are Quite available now (compared when 1st introduced !) either through Amazon- or Koss Factory Direct.

Koss should make a bluetooth ‘pendant’ for the utility series. that would be the icing. does any know of a bluetooth receiver with 2.5 mm termination?

There are none. The problem here is you need to convert the 2.5mm trrs configuration with a wire. You can get any wire which fits hd598 either balanced or unbalanced. Then only connect to a Bluetooth pendant.

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Koss KPH40 Utility On-Ear Headphones, Detachable Interchangeable Cord System, Ultra Lightweight Design, Stealth Grey

Koss KPH40 Utility On-Ear Headphones, Detachable Interchangeable Cord System, Ultra Lightweight Design, Stealth Grey

Product ID: 419343905

Details

Brand
Koss
Colour
Grey
Ear Placement
On Ear
Form Factor
On Ear
Noise Control
None

🎧Detachable cord system

🔄Universal 3.5mm jack + USB-C/Lightning options

⚖️Ultra lightweight 0.11 kg

€ 130.95

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Description

🎧 Elevate your everyday audio—lightweight, versatile, and always connected.

DURABLE STYLISH - Stainless steel enclosure in stealth grey blends rugged durability with sleek, modern aesthetics.
FEATHERLIGHT COMFORT - Ultra lightweight design ensures all-day wear without fatigue—perfect for busy professionals on the move.
NO BATTERY NO HASSLE - Pure wired audio with zero latency and no charging required—always ready when you are.
CUSTOMIZABLE CONNECTIVITY - Includes standard 3.5mm cord with optional USB-C and Lightning cables featuring in-line mic & remote for versatile use.
SEAMLESS DEVICE SWITCHING - Swap cords effortlessly to connect with any device—future-proof your audio setup.

The Koss KPH40 Utility On-Ear Headphones deliver a premium wired listening experience with a detachable cord system compatible with 3.5mm, USB-C, and Lightning connections. Weighing just 0.11 kg, these ultra-light headphones offer all-day comfort and durability with a stainless steel frame. Designed for professionals who demand flexibility and no-compromise sound, the KPH40 requires no batteries and supports seamless device switching, making it the perfect companion for work, travel, and everyday use.

Specifications

ASIN	B09KZC94X1
Age Range Description	Adult
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#101,843 in Electronics ( See Top 100 in Electronics ) #86 in On-Ear Headphones
Brand Name	Koss
Cable Features	Detachable
Colour	Grey
Compatible Devices	Tablets, Cellphones, Laptops, Smart Speakers
Control Method	Remote
Country of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (1,276)
Earpiece Shape	On ear
Enclosure Material	Stainless Steel
Headphone Form Factor	On Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	On Ear
Is Autographed	No
Item Weight Unit of Measure	0.11 Kilograms
Manufacturer	Koss
Model Name	KPH40 Utility
Model Number	KPH40 Utility Parent
Network Connectivity Technology	Wired
Noise Control	None
Number of Items	1
Product Features	Lightweight
Style Name	On ear
Theme	grey
UPC	021299197455
Unit Count	1 Count

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€ 130.95

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In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

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