[art191]

The left speaker on my portapro's has developed a rattle/distortion on the lower frequencies, I use them with my mini-ipod. Sounds ok with other phones. Is it likely the driver is terminally ill, or could it be fixable? Maybe somebody out there has had the same problem?

 

[cire]

gotta love the lifetime warranty

 

[Peyotero]

Sometimes small hairs get threw the foam so the membrane rattles when the hair touches it. Try removing the foam and blow some air in it.

 

[art191]

Thanks Peyotero, I stripped off the foam and did as you suggested.......job done!!!

 

[EdipisReks]

the Koss 60 ohm phones share a lot of things with Grados, and the grattle is one of them. i'm glad you got it sorted out.

 

[VicAjax]

ah yes, the famous hair grattle. koss should mention it in the manual or something.

 

[delaril]

Just re-awakening this thread from the dead to thank you for the info. This problem has been bugging me for a few weeks but I didn't think of this until I did a search, and here I am -- rattle-free!

 

[Yukon Trooper]

Look for hair. I thought my KSC75's had started to fail until I realized it was just a hair in the driver. All good now!

 

[yale.reinstein]

My Grados never get this 'graddle' but my PortaPros used to every couple weeks... Should be called something else.

 

[bigbadbass]

Thanks! A load of my heart!

 

[Disasterdude]

Re-upping this in 2022 because I had a bass vibration that was driving me nuts and low and behold, it a little air and boom, it's gone.