I've been noticing reviewers speaking about "burn in". What is required with these buds?

I've happily owned a pair of these phones for a while, and use them daily. I'm aware of burn-in considerations, especially as I used to mess around with high end speakers and drivers years ago. My experience with these exact phones is that the bass notes did show some increased quickness within a couple of weeks. It was nothing earth shattering, but I remember noting that the bass response got a little more responsive as the phones broke-in. I do not believe that the Sennheisers need a formal break in with white noise generators or any such tools. It's just that you'll notice that you like them even a little more after the initial listening period. What I've noticed also is that I'm accustomed to the sound of these phones and when I use a different set, I'm not at all happy with the strange phones. The Sennheisers deliver a sound quality that is very attractive to me. They were a worthwhile investment in my way of looking at it. Good Luck with your decision.

Has anyone tried using earphone ear hooks on these ear buds?

I actually wrap the cable over my ear before placing the ear buds in my ear. They stay in fine, even while running.

I am looking for earbuds to use when watching movies on the iPad. Would these be a good fit?

Yes, They are in fact used in the profesional audio world for musicians personal monitoring. Not as the top of the line in this world but a nice affordable eardbuds used a lot for pro audio rentals companies. Top of the line earbuds cost more than double of these. In fact can reach US$200 ( IE 6 and nexts ). I got some of these IE 4 in fact to be used in a rental company, ( and a set for me )

ASIN	B0018Z7EIM
Additional Features	universal-phone-control
Age Range Description	Adult
Antenna Location	Music
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#119,667 in Electronics ( See Top 100 in Electronics ) #5,820 in In-Ear Headphones
Brand	Sennheiser
Built-In Media	1 earphones IE 4\|3 pairs of ear sleeves (small, medium, large)
Cable Features	Without Cable
Carrying Case Color	black
Color	Black
Compatible Devices	Laptops, Desktops, Gaming Consoles, Tablets, Telephones, Smart Speakers, Televisions, Car Audio Systems, Cellphones
Connectivity Technology	Wired
Control Method	Remote
Control Type	Touch Control
Customer Package Type	[Predicted: Rigid or Cushioned Packaging]
Customer Reviews	4.0 out of 5 stars 139 Reviews
Earpiece Shape	Rounded Tip
Enclosure Material	Plastic
Frequency Range	20 Hz - 20,000 Hz
Global Trade Identification Number	00615104105676
Headphone Folding Features	In Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	In Ear
Impedance	140 Ohms
Is Autographed	No
Item Type Name	Headphones
Item Weight	5 g
Item height	1 inches
Manufacturer	Sennheiser
Model Name	IE 4
Model Number	500432
Noise Control	Sound Isolation
Number of Items	1
Sensitivity	127 dB
Series Number	500432
Specific Uses For Product	Professional Audio Monitoring
Subject Character	no character
UPC	615104105676
Unit Count	2 Count
Water Resistance Level	Not Water Resistant

Sennheiser IE 4 Earphones

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