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.

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Description

🎶 Hear every detail, miss nothing — the sound engineer’s secret weapon.

LIGHTWEIGHT DURABLE - Crafted from anodized aluminum, these sleek earphones weigh just 18g, combining portability with premium build quality.
STUDIO GRADE PRECISION - Experience audio exactly as the artist intended with a neutral, flat frequency response tuned for true-to-life sound.
EFFORTLESS CONNECTIVITY - Detachable wired USB cable ensures easy replacement and tangle-free use, ideal for professionals on the move.
TAILORED FOR AUDIOPHILES - Designed with 20+ years of acoustic research, delivering a subtle frequency hump to perfectly match human ear resonance.
UNMATCHED NOISE ISOLATION - Block out up to 42 dB of ambient noise—perfect for focused work or immersive music sessions anywhere.

The Etymotic ER3SE Studio Edition in-ear earphones feature a single balanced armature driver delivering precise, neutral sound reproduction. With up to 42 dB of passive noise isolation, anodized aluminum construction, and a detachable cable, these lightweight earphones are engineered for audiophiles, sound professionals, and discerning listeners seeking uncompromised audio clarity.

Specifications

Noise Control	Sound Isolation
Connectivity Technology	wired usb
Wireless Communication Technology	;;
Age Range (Description)	Adult
Material	Metal
Recommended Uses For Product	Music
Control Type	Noise Control
Cable Feature	Detachable
Item Weight	0.02 Kilograms
Water Resistance Level	Not Water Resistant
Frequency Range	20Hz - 16kHz
Net Quantity	1.0 count
Style	In-ear
Control Method	Touch
Number of Items	1
Audio Driver Type	Balanced Armature Driver
Carrying Case Weight	150 Grams
Carrying Case Color	Black
Audio Driver Size	6 Millimetres
Earpiece Shape	Rounded Tip
UPC	846430002104
Special Feature	Noise Cancellation
Global Trade Identification Number	00846430002104
Manufacturer	Etymotic Research
Model	ER3SE
Model Year	2017
Product Dimensions	5.08 x 9.53 x 17.78 cm; 18 g
Item model number	ER3SE
Special Features	Noise Cancellation
Aspect Ratio	Unknown
Batteries Included	No
Batteries Required	No
Cable feature	Detachable
Speaker Output Channel Quantity	1
Includes Rechargeable Battery	No
Includes AC Adapter	No
Item Weight	18 g

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