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Ipod 5.5 rockboxed - safe hearing levels with iem/with headphone?

post #1 of 17
9/22/10 at 4:54pm
Thread Starter 

is there a safe hearing level with the rockbox? i.e. dont go over "-xx" db?

 

ediot:  i understand 'a bit' about impedance, so, is there like a safe ratio of volume level to impedance?


Edited by absoluNewbie - 9/22/10 at 5:02pm
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post #2 of 17
9/23/10 at 5:43pm
Thread Starter 

stupid question is stupid? please explain stupidity

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post #3 of 17
9/23/10 at 8:33pm

Different phones drive differently, it's safe as long as your ears don't feel uncomfortable after a long period of use.

 

If it starts hurting, just turn the volume down.

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post #4 of 17
9/24/10 at 5:41pm
Thread Starter 

wait...what if my hearing is impaired already? requiring me to put the volume up louder than say..normal, will this further impair my hearing?

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post #5 of 17
9/24/10 at 8:26pm

No, the sound you hear from your headphones is no different than the sound you hear in real life. Headphones don't make people deaf, loud noise do.

 

As long as there's no discomfort with the volume you use now, there shouldn't be a problem. 

 

EDIT:

 

I should note that treble and bass could result in headaches, so you should properly balance it out to prevent damages.


Edited by mootookang - 9/24/10 at 8:35pm
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post #6 of 17
9/25/10 at 10:43am

90dB should be quite safe.

It is not all about SPL though, but also exposure time. The longer time the lower the dB, and the other way around.

 

Edit:
SPL, not PSL


Edited by krmathis - 9/25/10 at 11:48pm
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post #7 of 17
9/25/10 at 11:27pm
Thread Starter 

90db is minus what in rockbox? i understand that 0 db is max without distortion in rockbox?? yeah i get exposure time, im looking for a level that is safe for prolonged exposure:2 hours nonstop say? with 5 min break in between? what lvl would this be?

 

how do i balance treble and bass? also i notice sometime i have to take earbuds out of my ears cause my head starts too hurt. is listening to dizzy gillespie on a bad earbuds supposed to do this?

 

edit: psl is?

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post #8 of 17
9/29/10 at 10:56pm

I would recommend reading rockbox's manual if you haven't already done so.  Most of your questions can be answered by it.

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post #9 of 17
9/30/10 at 5:30pm
Thread Starter 

yeah it's just so///long... i need the tl;dr version

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post #10 of 17
10/1/10 at 4:14pm

Different phones have different ohms, which means it takes different amount of power to drive them to the same volume. Isolation is also a big part of it, an pair of open headphones would require more energy to drive because they let noise in pretty easily.

 

I usually drive my HA-S700, a 32 ohm phones with pretty good isolation at about -32 db indoors, and around -26 db outdoors. But this cannot be used as reference since your phones are clearly different from mine.

 

There is a bass/treble cutoff option under sound setting, use that to make sure the bass and treble wouldn't get to uncomfortable levels. You can also manually adjust the bass and treble. Hope this helps.

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post #11 of 17
10/2/10 at 12:15am
Thread Starter 

thanks, i usually run my metrofi.100 at around -41db in the bus, if i adjust treble cutoff, this means at certain frequency no sound will come out?

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post #12 of 17
10/2/10 at 12:32am

http://download.rockbox.org/daily/manual/rockbox-ipodvideo/rockbox-buildch6.html#x9-1070006

 

^ Read this part of the rockbox manual, I think it is the most important part that explains everything that has to do with SQ.

 

Also, try to properly burn in your metrofi with colored noise, and wear them over your ears to increase the comfort level.

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post #13 of 17
10/2/10 at 7:10pm
Thread Starter 

the metrofi has been well used since a long time ago, should have burned in with age methinks. they are just lo end earbuds as i understand

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post #14 of 17
10/2/10 at 7:19pm
Thread Starter 

"This setting controls the frequency above which the treble adjustment applies. The setting has a range from 1 to 4, where a bigger number affects a smaller range of treble frequencies. The actual cutoff frequency used for each setting value will vary with sample rate. "

 

in layman's terms? also goes for bass.

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post #15 of 17
10/4/10 at 11:45pm

Bass and treble are on the opposite side of the spectrum, cutting treble would not lower the bass.

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