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 for natural sound

🪶Ultra lightweight 0.11 kg design

⚙️Detachable, interchangeable cords

₨1406

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Description

🎧 Elevate your sound game with retro style and modern freedom!

ALL DAY COMFORT - Soft foam ear cushions and ultra-lightweight stainless steel chassis keep you focused, not fatigued.
FREEDOM TO CUSTOMIZE - Detachable cord system lets you switch cables effortlessly for any device or style.
PURE OPEN BACK AUDIO - Experience expansive soundstage with open-back design, perfect for critical listening and work calls.
PLUG PLAY VERSATILITY - Compatible with any 3.5mm jack device, plus USB-C and Lightning adapters for seamless connectivity.
RETRO VIBES MODERN PERFORMANCE - Classic stealth black design meets audiophile-grade sound clarity.

The Koss KPH40 Utility On-Ear Headphones combine a retro open-back design with ultra-lightweight stainless steel construction and a detachable, interchangeable cord system. Delivering audiophile-quality sound with 101 dB sensitivity and a wide frequency range, these headphones offer all-day comfort with soft foam cushions and versatile compatibility across 3.5mm, USB-C, and Lightning devices. Perfect for professionals seeking style, comfort, and customizable connectivity.

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	#7,340 in Electronics ( See Top 100 in Electronics ) #184 in On-Ear Headphones #554 in Earbud & In-Ear Headphones
Brand	Koss
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 Package Type	FFP
Customer Reviews	4.3 out of 5 stars 1,346 Reviews
Ear Placement	On Ear
Earpiece Shape	Rounded, flat or slightly curved surface
Enclosure Material	Stainless Steel
Form Factor	On Ear
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
Theme	Retro
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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