How many drivers per ear piece are there?

From the manufacturer's website. "Using a single Balanced Armature (BA) driver allows for extremely accurate IEM without the added complexity of crossovers, and helps keep the aluminum body small and slim." So that means 1/ear to me.

I have been using Etymotic mk5 phones for a long time... would these have a similar level of comfort, or perhaps be more comfortable?

The ER3SE earphones are as comfortable as your choice of earplugs. You have a lot of options including those from other vendors. I have seen the three-lobe models, two-lobe models, foam, and made-to-order custom-fit earplugs. Personally, I found the two-lobe earplugs to be comfortable and Westone makes a very comfortable custom-fit earplug that will last for several years. If price is not a problem, I highly recommend the Westone made-to-order earplugs for the ER3SE. They provide the most comfort and the best noise isolation.

Can the main detachable peice be replaced (not the detachable foam part but the main driver)? I'm getting low volume on one side.

With low sound on one side, the first thing to do would be to replace the filter. It's probably clocked with earwax. They're replaceable and that's what they're there for. Otherwise, when I sent in a pair of earphones, they replaced the earpiece/driver on one side.

Are these good for listening to music through my phone? Or are these just made for studios?

I use them with my phone all the time. They are really good at blocking the outside noise. I love them when I'm flying.

Etymotic Er3se Studio Edition Earphone Black

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Description

🎶 Hear every detail, miss nothing—your studio sound, anywhere.

CUSTOMIZABLE FIT - Choose between silicone or foam tips for personalized comfort and isolation.
STUDIO GRADE ACCURACY - Experience crystal-clear, neutral sound exactly as the artist intended.
EFFORTLESS DRIVEABILITY - Low 22Ω impedance means no amp needed—perfect for on-the-go professionals.
UNMATCHED NOISE ISOLATION - Block out distractions with up to 42dB passive noise cancellation—focus like never before.
PRECISION MACHINED METAL SHELLS - Durable anodized aluminum bodies engineered for comfort and longevity.

The Etymotic ER3SE Studio Edition earphones deliver ultra-accurate, flat frequency response with a single balanced armature driver, engineered for professional audio clarity. Featuring precision-machined anodized aluminum shells and up to 42dB passive noise isolation, these wired in-ear monitors offer exceptional sound fidelity and comfort for audiophiles, musicians, and sound engineers seeking true-to-source audio without compromise.

Specifications

ASIN	B07665KVD1
Additional Features	Etymotic designs products to measure, protect and improve hearing, and enhance the listening experience of music lovers everywhere. Audio engineers, musicians and audiologists at Etymotic have generated over 100 patents issued and pending.
Age Range Description	Adult
Antenna Location	Music
Audio Driver Size	6 millimeters
Audio Driver Type	Balanced Armature Driver
Best Sellers Rank	#56,724 in Electronics ( See Top 100 in Electronics ) #2,641 in Earbud & In-Ear Headphones
Brand Name	Etymotic
Built-In Media	Headphones, case, tip pack, manual
Cable Features	Detachable
Carrying Case Color	Black
Carrying Case Weight	150 g
Color	Black
Compatible Devices	Cellphones
Connectivity Technology	Wired
Control Method	Remote
Control Type	Media Control
Customer Package Type	Standard Packaging
Customer Reviews	4.2 4.2 out of 5 stars (336)
Earpiece Shape	Rounded Tip
Enclosure Material	Metal
Frequency Range	20Hz - 16kHz
Global Trade Identification Number	00846430002104
Headphone Folding Features	In Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	In Ear
Impedance	22 ohm
Item Type Name	ER3SE Studio Edition In-Ear Earphones
Item Weight	0.02 kg
Manufacturer	Etymotic Research
Model Name	ER3SE
Model Number	ER3SE
Noise Control	Passive Noise Cancellation
Number of Items	1
Specific Uses For Product	Studio
UPC	846430002104
Unit Count	1 Count
Warranty Description	2 Years
Water Resistance Level	Not Water Resistant

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