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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KPH40 Utility On-Ear Headphones, Detachable Interchangeable Cord System, Retro Style, Ultra Lightweight Design (Stealth Black)

Product ID: 379307046

Details

Brand
Koss
Color
Stealth Black
Ear Placement
On Ear
Form Factor
On Ear
Impedance
60 Ohms

🎧Open-back airy sound

🪶Ultra lightweight stainless steel

⚙️Detachable interchangeable cord

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Description

🎶 Elevate your sound game with retro flair and modern freedom!

TIMELESS RETRO STYLE - Sleek stealth black with stainless steel chassis blends vintage cool with modern durability.
AUDIOPHILE GRADE CLARITY - Open-back design delivers spacious, detailed sound that rivals headphones costing 2-4x more.
CUSTOMIZABLE CONNECTIVITY - Detachable, interchangeable 3.5mm cord system adapts seamlessly to your devices and lifestyle.
EFFORTLESS ALL DAY COMFORT - Ultra lightweight design with soft foam cushions means you’ll forget you’re even wearing them.
UNMATCHED VALUE FOR PROFESSIONALS - Premium sound and build quality at a fraction of boutique brand prices—perfect for work, travel, and play.

The Koss KPH40 Utility On-Ear Headphones combine an ultra lightweight stainless steel frame with an open-back design for spacious, detailed audiophile sound. Featuring a detachable, interchangeable 3.5mm cord system, these stealth black headphones offer customizable connectivity and all-day comfort with soft foam ear cushions. Ideal for professionals seeking premium sound quality and retro style without the premium price tag.

Specifications

ASIN	B09KZC94X1
Additional Features	Lightweight
Age Range Description	Adult
Antenna Location	Everyday Use, Traveling, Exercising, Recording
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#7,376 in Electronics ( See Top 100 in Electronics ) #122 in On-Ear Headphones #559 in Earbud & In-Ear Headphones
Brand Name	Koss
Built-In Media	Cable
Cable Features	Detachable
Color	Stealth Black
Compatible Devices	Devices with 3.5mm audio jack, USB-C port, or Lightning port
Connectivity Technology	Wired
Control Method	Touch
Control Type	Media Control
Controller Type	Wired
Customer Reviews	4.4 4.4 out of 5 stars (1,327)
Earpiece Shape	Rounded, flat or slightly curved surface
Enclosure Material	Stainless Steel
Frequency Range	20 Hz - 20,000 Hz
Frequency Response	25000 Hz
Headphone Folding Features	On Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	On Ear
Impedance	60 Ohms
Is Autographed	No
Item Weight	0.11 Kilograms
Manufacturer	Koss
Model Name	KPH40 Utility Parent
Model Number	KPH40 Utility Parent
Noise Control	None
Number of Items	1
Sensitivity	101 dB
Style Name	open-back
UPC	021299197455
Unit Count	1.0 Count
Warranty Description	Limited Lifetime Warranty
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth

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