Originally Posted by Tus-Chan
I noticed a problem today with my Stax SR-303. Whenever very low bass notes/tones play, I hear a very loud rattle unless I press the earspeakers against my head. It's so loud that I can hear it without placing the headphones fully on my head. What is going on?
I am freaking out right now. My AKG K167 broke literally yesterday, I can't handle my only remaining headphone having obnoxious problems like this.
So when I opened up a pair of Lambda-Pros recently, I noticed one driver had separated from its baffle. I used double-sided tape to reattach the driver to the baffle. It's odd that your rattle is taking place in BOTH ears, but it's possible that both drivers have become separated from their baffles. If, on the other hand, the drivers have come apart internally (as it did with me a few posts back), you'll have a big repair on your hands.
On most Lambdas, going from your ear outwards, you have the earpad, foam or cloth cover (usually part of the earpad), baffle, driver, more foam, and the back grille. The earpad and driver are stuck either side of the baffle with double-sided tape, while the baffle is screwed to the back grille (the screws are on each corner of the earcup; gently lift the corners of the earpad to access the screws). Complicating matters slightly is the cable, which slots into a notch on the bottom of the back grille. The cable is soldered to the driver, so never pull on it.
You could try the following, but I would wait to see the advice of others first, as I am not an expert:
To open the earcup, unplug the headphones from the amp, undo all four screws and then gently remove the back grill, making sure you don't strain the cable in any way. The driver should be stuck firmly to the baffle. If not, you will need to re-adhere it using double-sided tape. Try to clean off as much of the old sticky tape as possible, using a plastic edge, like a credit card. No water, liquids, etc. Also, when 'scraping', always scrape outwards, so that none of the junk you scrape off has a chance to get on the driver. Then apply double-sided tape to the edge of the driver (see my next post) reposition it, and put everything back together.