How is the sound isolation?

Not good. If you want isolation, try T40RP MK3. They are closed and should provide better isolation and they use the same driver as the T50RP.

Can you compare sound quality to sennheiser momentum 1.0? I am looking for my first open back headphones.

The T50RP is the semi open model and considered the most neutral sounding. The T20RP is the open back model and considered to have the most bass. The T40RP are the closed back model. As other have said an AMP is recommended these require a little power to drive. Probably the most power hungry headphone I've owned.

How hard are they to power? Will fiio x3 (first gen) handle it?

I have a Hiby r3, Hiby r6 Pro and a FIIO X3 II. The FIIO has significantly more power and drives the T50RP rather well. I am modding the T50RP to balanced to see if the Hiby's can provide more juice that way. I don't like running 100% volume for not enough drive strength. FIIO is a strong little bugger!

Can the smsl sd793-ii dac/amp combo power these to a modest level (not painfully high)?

I'm not sure this helps, but I use a Fiio A3 Amp w/ my Fostex... it gives nice even highs/lows amplification. I use it w/ an iPod nano, samsung phone, and nexus tablet... my computer and laptop drive the head phones fine w/o the amp.

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Fostex T50RP MK3 Professional Studio Headphones, Semi-Open, Black | Maximum input level of 3000mW to comply with various professional uses, Semi-open for flat and clear sound

Fostex T50RP MK3 Professional Studio Headphones, Semi-Open, Black | Maximum input level of 3000mW to comply with various professional uses, Semi-open for flat and clear sound

Product ID: 19261780

Details

Brand
Fostex
Color
Black
Ear Placement
Over Ear
Form Factor
Over Ear
Noise Control
None

🎧3000mW max input power

🔌Detachable 3m & 1.2m cables

🧲Neodymium magnet driver tech

Description

🎧 Elevate your sound game — hear every detail, feel every moment.

POWERFUL VERSATILE - Handles up to 3000mW input, perfect for professional mixing, gaming, and high-res audio setups.
COMFORT MEETS ENDURANCE - Low repulsion ear and head pads ensure fatigue-free wear during marathon sessions.
PLUG PLAY FLEXIBILITY - Includes detachable 3m 1/4-inch and 1.2m mini cables for seamless transition between studio and portable use.
PRO GRADE AUDIO PRECISION - Refined Regular Phase diaphragm delivers razor-sharp, studio-accurate sound for critical listening.
SEMI OPEN DESIGN FOR CLARITY - Balanced soundstage with flat, clear audio that keeps you immersed without isolation fatigue.

The Fostex T50RPmk3 headphones feature a proprietary copper foil Regular Phase diaphragm with a powerful neodymium magnet, delivering precise, flat, and clear sound ideal for professional monitoring and audiophile listening. With a maximum input of 3000mW, semi-open design, and ultra-comfortable low repulsion pads, these wired headphones come with detachable cables for versatile studio and portable use. A cult favorite for over 30 years, the T50RPmk3 strikes the perfect balance between comfort, power, and sonic accuracy.

Specifications

ASIN	B0167XM092
Additional Features	Lightweight
Age Range Description	Adult
Antenna Location	Recording
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#86,783 in Musical Instruments ( See Top 100 in Musical Instruments ) #217 in Recording Headphone Audio Monitors #4,629 in Over-Ear Headphones
Brand Name	Fostex
Built-In Media	Cable
Cable Features	Detachable
Color	Black
Compatible Devices	Devices with 3.5 mm audio jack or detachable cable support
Connectivity Technology	Wired
Control Method	Remote
Control Type	Call Control
Controller Type	wired
Customer Package Type	FFP
Customer Reviews	4.5 4.5 out of 5 stars (330)
Earpiece Shape	Round
Enclosure Material	Copper
Frequency Range	15 Hz - 35,000 Hz
Global Trade Identification Number	00636827306119
Headphone Folding Features	Over Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Item Weight	11.36 ounces
Manufacturer	American Music and Sound
Model Name	T50RP MK3
Model Number	AMS-T50RPMK3
Noise Control	None
Number of Items	1
Series Number	50
Specific Uses For Product	Professional
Style Name	T50RP MK3
Theme	Studio Headphones, Professional Recording
UPC	636827306119
Unit Count	1 Count
Warranty Description	1 year.
Water Resistance Level	Not Water Resistant
Wireless Technology	Neodymium Magnet

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