I have pink noise which is 20 minutes long... and pause for 2 minutes will be safe thing to do ?

(just to mention the case with hfi2200 - they were running pink noise 10hours x 5days with high volume level, drivers were shaking a bit and they past the torture... but when i red ldj325's post i decrased pink noise volume for 2500 much below listening levels - which only get 8hrs of it and died few hours later)

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To quote my favorite bunny (Bugs Bunny, esq.):

"Nnnnnyyyyaaaahhh... Could be!"

The pause couldn't hurt. Just no shaking drivers anymore, alright?! (maybe we should call that method a "toast-in"! heh)

Terry

Maybe an irrelevant question on this thread but asking anyways...
I am listening to "Simple Things" from Zero 7 with the 750 and comparing 2 kinds of qual. One is 188 kbps mp3 and the other one is 1536 kbps AIFF.
Is it possible that some parts in the music gets a boost when being compressed for example the lows? With the 188 kbps the bass seems muddier and louder. The voices show enoying pronounced 's' and 'c'. Also the 188 adds a lot of noise to the track.
Anyone an answer to the first question about the boosting-part?

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MP3's can show a lot of variation even at the same bitrates depending upon which tool is being used to create it and that tool's settings. Some people have been making amazing sounding 128kbps mp3's using foobar and the LAME encoder that comes with it (LAME is available for Macs, I'm pretty sure, since Mac OSX is a deriviative of BSD Unix.) But, amazing sounding as lossless? Well, nobody is saying that. It seems the 256kbps zone is where mp3's start becoming indistinguishable at just about all times across the board from lossless formats (AIFF is a lossless format like WAV - FLAC and Apple Lossless are lossless yet compressed, like a zip file for music - nothing is lost, though), though 192kbps can be made to work just as well at being indistinguishable from lossless with a large variety of musical numbers. The VBR setting (variable bit rate) seems to have some detractors, because it probably doesn't work well for every single track out there, but it does for many and is another space saver. The settings are being improved upon constantly, and you select the ones that work best with the recording you are compressing, or compromise somewhere for convenience and compress everything with the same settings. Even the most hard-boiled audiophile I've run into had to admit they were hard pressed to hear a difference at 320kbps, but now we're getting into file sizes similar to FLAC and Apple Lossless anyway, for the most part.

Hope that helps. There is a ton written about this and some very impolite and heated debates elsewhere in this forum in other sub-forums. Best to google for some tutorial sites most likely!

Terry

Hey Terry thanx. I think I was a little unclear in my post.
I downloaded some files of the internet from zero7 and they were 188 kbps (so don't know how they actually were compressed). I have bought the cd recently and I imported it in my iPod with 1536 kbps. I find it interesting comparing these two quals and I noticed some differences I also noticed with other albums when done like this.
I am sometimes really impressed by how good some 128, or something like that, kbps tracks sound but lossless I do prefer. Space is not a problem. When my ipod is close of getting completely filledl I just buy a bigger one haha

I played just music at moderate volumes the first hours then pink noise at sensible listening volumes or slightly below...

Ran them non stop though the pink noise I used first had 10 seconds pink noise 1 second pause 10 seconds pink noise... From what I understood not as stressful as track58. I ran that afterwards non stop for up to 15 hours straight I can´t hear any issue on my headphones. I got a bit worried for a while they sounded really dark while everyone told me they where bright cans but guess something with my ears...

Think I have 110-130 hours pink noise. Now I just created a playlist with track 58 and then some mp3 for 4 minutes in foobar.

But as long as you play fine and you get the same volume on both cans nothing is blown I guess

Now I am wondering. As for pink noise. Running it through an amp is it more effective/stressful then running straight out of my soundcard? On my X-fi it´s 50 % volume max I run...

Also as for amps. pink noise is it more effective for burning in amps as well or should you just pump the volume on the amp to burn it in?

WARNING: From the Desk of the Secretary of the Interior Ultrasonia
This post may contain OT and unauthorized humor or other comments. Read at you own risk. (If you don't know what this refers to, no need to ask as its simply a private joke relating to another Ultrasone thread. But it does apply to those who would want to act as thread police.)

Since I have had experience with 2 of the three dead Ultrasones (2 - 750s & 1 - 2500), I thought I would recap.

First dead 750 was at a pro audio shop. Obvious mishandling as the velor was torn on one cup. Both speaker cups played music and both had some bass, but very weak bass. But the rest of the speaker response seemed OK. I checked the cable on 2nd visit and this did not seem to be the issue.

My dead 750: (To the best of my recall) First 10 hours was music played at normal volume. Next 24 hours or so wass continuous loop music out of iPod>Hornet at slightly louderr than normal volume. Approximately 35 hours started continuous loop of Track 58 (no pause in between) at slightly higher than comfortable listening volume. I played this continuously 24/7 except for the times I was listening to music for about the next 10 days. After that I went back to music 24/7 for 2 days then music only when it was listening which was only 10-12 hours over 2-3 days.

Additionally, for most of this time I was simultaneously "burning in" some very old (8-10 year) Senn HD-25 SP, and a very low hours (maybe 2-3) set of KSC75s (purchased 4 months ago). The only difference was that much of the time the Singlepower Extreme was the amp for the 750s and the Hornet was the amp for the Senn HD25 & KSC75. Checking these 2 HP now and everything seems fine with them.

A few times, due to the logistics of my set up and not wanting to turn off/on tube HP amp and tube phono preamp, I pulled out and later put back in the line out plug on my iPod dock with all 3 sets of HP attached. I know this can give a sudden electrical buzz sound that is unpleasant to hear. I don't know if that is enough to cause a speaker failure (but why only on Ultrasones?), but Terry seemed to indicate that it wouldn't in a previous post. (Terry, please correct if given the greater details this changes your opinion.)

So this sure looks like an Ultrasone quality control issue to me. I hope that this isn't the case as I have found a line that I really love, and I want the love to continue (maybe eventually with some Edition 9s). At the same time, I don't think there is any reason to hide this type of information. I don't have any stock in Ultrasone. If there is an issue with quality control it might as well be known. That makes it part of the buying decision for new folk as well as for upgrading decisions.

Secretary of the Interior Ultrasonia

Any more news on the Edition 9? It seemed like a bunch of people were getting them, but I haven't seen any impressions, etc. in the past few days.

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They are to busy listening to their new headphones to post.

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I believe they are still waiting for it to arrive..

Just reporting that today i recieved new 2500 pair ofcorse for free... There was no problems about replacing... I hope i will write only good things about them this time! Bye
p.s. Now please dont speake about this... here is Edition 9 to talk about ... so move on

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That's great to hear, z00ne!

Hopefully, the second time will be the charm!

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Well, I hope there will be E9's to talk about, b/c so far there aren't that many! But don't worry, it's quite alright for you to share with us your PROline 2500 adventures! I'm very glad you were able to get the replacement

I am not sure where it comes from but lately I sometimes feel my right-ear to be in a little pain sometimes. Perhaps I listen to these cans too much though that would be kinda odd and nasty...
I feel it since I listen to the 750's. It's not always there but it disturbs me. I try to not crank the volume up to loud. It is definately not that I am hearing noise or beeps or stuff like that. Just a little pain sometimes...Has anybody ever had the same feeling???

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The humidity from the closed headphones can sometimes help hardened earwax to begin to break free, and that can hurt till it comes off the inside of your ear all the way. I've had that experience a couple years ago. May be time for an ear cleaning? I hope you aren't getting any ear infection going on!

Terry