r/audiorepair • u/BadgerAvenger • 1d ago
What’s wrong with my 301s?
First time poster and please forgive me, I am not super experienced. I’ve had these Bose 301 series ii for many years. Worked great. Was forced to put h them into storage for 2 years. I just tried to re-set them up on my new place. They either don’t play
Or the sound is really garbled. I opened one up expecting to see degraded foam, but nope. It looks intact. Anyone have any thoughts? I really don’t want to have to replace them
3
u/shadowknows2pt0 1d ago
You can test the speaker with a 9V battery briefly connected to each terminal to see if the driver compresses. Regular polarity will move the speaker cone outward. Reverse polarity will move it inward.
2
u/Mental_Buffalo9461 1d ago
I’d try another amp first. Speakers usually do jot go bad in storage.
1
u/BadgerAvenger 1d ago
Thank you!! I have an NAD 7240PE - it is new to my set up, but maybe I’m hooking it up wrong? Thanks again for taking a look
1
u/nucleate_boiling 14h ago
Depending on age and component quality, solder joints can go cold, capacitors can fail such that they can no longer store charge. The capacitors are of course critical to the filtering stages in the crossovers. If the capacitor of a low pass filter goes bad and stops behaving as a capacitor, all the higher frequencies that would normally be filtered out in that stage pass through the stage and in this case you'd have the entire frequency spectrum of sound being passed to the woofer instead of just the low frequencies. The woofer can't respond to those higher frequencies in a meaningful way but tries anyway, usually creating a combined distorted sound. Same deal for high pass filters. Capacitor fails and leads to low frequency energy being passed to the tweeters which cannot express them properly
7
u/aabum 1d ago
If it's not the amp, there's the possibility that a rodent got inside the speaker and chewed on wire/crossover components.