what's a compatible replacement cable for this headset that does not have the inline mic?

The HD 400S uses the same "bayonet" type click and lock system as the HD 5XX Series products. Replacement cables, with and without an in line mic are available. There are many aftermarket options available on Amazon.com.

How big are the ear cups (inside diameter please ...if you can)?

At its' widest point, it is as long as my index finger across. This is -not- your typical "over-ear" headphones and is more of an in-between. It's not fully ON EAR and it's not fully OVER EAR. At first I was disappointed, but it's actually really comfortable. I forget I'm wearing it, sometimes.

Do these have a lot of bass? I don’t want a lot of bass. I want a nice clean smooth sound.

No, it doesn't have a lot of bass. It focuses on strong mids and clear highs. Acoustic and/or synthesized (electronic, atmospheric music, etc.) sounds come through really well.

The one button remote controls volume too?

It technically does, but it requires you to double/triple tap and then hold on the last tap. I have a lot of trouble double/triple tapping fast enough for it to register as something other than pause/play.

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Description

🎧 Elevate your sound game with Sennheiser HD 400S — where work meets premium audio!

UNIVERSAL COMPATIBILITY - Plug-and-play with any device via the standard 3.5mm jack—no adapters needed.
WORK FROM HOME ESSENTIAL - Engineered for crystal-clear voice quality, perfect for professional calls and virtual meetings.
COMFORT MEETS PORTABILITY - Lightweight, foldable design with plush ear cushions ensures all-day comfort and easy storage.
IMMERSIVE AUDIO EXPERIENCE - Signature Sennheiser sound delivers rich bass and crystal-clear clarity for every beat and call.
SEAMLESS CALL MUSIC CONTROL - One-button inline remote lets you manage calls and playlists without missing a moment.

The Sennheiser HD 400S wired over-ear headphones combine German engineering with dynamic bass-driven sound and a noise-isolating closed-back design. Featuring a lightweight, foldable frame and an inline mic with one-button control, these headphones are optimized for crystal-clear calls and immersive music. Compatible with any device via a universal 3.5mm jack, they are perfect for professionals working from home or on the move, backed by a 2-year warranty for trusted durability.

Specifications

Noise Control	Sound Isolation
Headphones Jack	3.5 mm Jack
Model Name	HD 400S
Connectivity Technology	Wired
Included Components	Cable, Headphone
Age Range (Description)	Adult
Material	Plastic
Specific Uses For Product	Music
Recommended Uses For Product	Calling
Control Type	Call Control
Cable Feature	Detachable
Item Weight	7.65 Ounces
Water Resistance Level	Not Water Resistant
Net Quantity	1 count
Style	closed back headphone
Control Method	Touch
Number of Items	1
Cable Length	4.9 Feet
Controller Type	Remote
Earpiece Shape	Round
Series number	400
UPC	615104327870
Manufacturer	Sennheiser, Sennheiser
Model	HD 400S
Model Year	2019
Batteries	1 Lithium Ion batteries required.
Item model number	HD 400S
Special Features	Lightweight, Noise Isolation, Microphone Feature, Tangle-free Cord, Universal Phone Control
Microphone format	with microphone
Microphone technology	Unidirectional
Batteries Included	No
Batteries Required	No
Battery cell composition	Lithium Ion
Cable feature	Detachable
Does it contain liquid?	No
Supports Bluetooth Technology	Yes
Manufacturer	Sennheiser
Country of Origin	China
Item Weight	216 g