The No.1 Website for Pro Audio
 Search This Thread  Search This Forum  Search Reviews  Search Gear Database  Search Gear for sale  Search Gearslutz Go Advanced
How To Diagnose Monitors/Speakers That Have Been Damaged By Excessive Low End Boost?
Old 30th August 2007
Deleted #29233
How To Diagnose Monitors/Speakers That Have Been Damaged By Excessive Low End Boost?

Something that I myself and I'm sure at least a few other people would like to know, is how to diagnose a speaker that's been damaged by excessive low frequency (below 50hz) boost. What are the common "symptoms"/"characteristics"?

Anyone have any facts or ideas on this?
Old 30th August 2007

The suspension (spider and surround) can get deformed.

In some designs, the voice coil can bottom out on the back plate and cause some defomation of the coil former. This can cause rubbing.

The DCR of the voice coil will sometimes change. And sometimes the laquer on the voice coil wire will charr or bubble. Both of these can be caused by excessive power or a DC offset in the amp output. The charred laquer will often rub.

Did you hear a change in sound? Or are you just being parinoid?


Old 30th August 2007
Easy. They say "Pro Ac" on the front.
Old 31st August 2007
Deleted #29233
Lol Mike....
ANyways no I didn't notice anything out of the ordinary.... I guess i was just being paranoid. BUT I'd still like to know what to look for. I don't exactly know what a damaged speaker sounds like... or do I? That is... a speaker that's been damaged by Excessive Low End Boost (Lower than 50Hz). SoundOnSound's EQ Guide describes clearly states that speakers/monitors "can and will" be damaged by excessive Boost in this range without the use of very high quality monitors. If this kind of damage did occur, what might the speakers/monitors sound like?

Old 31st August 2007
Gear Guru
u b k's Avatar

Originally Posted by owendolmer View Post
If this kind of damage did occur, what might the speakers/monitors sound like?


the easiest way to tell a blown woofer is by playing bass heavy music at very quiet volumes; the woofer will rub the piston and the sound will be very noticeable (and very annoying).

Old 31st August 2007
Deleted #29233
Very Helpful Info!...
Old 31st August 2007
Well there's also what I call the cracked stage. Damaged, but sounds still comes out.

I like the ProAcs but the blow very easily. My right woofer makes a low grinding sound with low frequencies at low volumes. If I crank the volume it doesn't happen. This is the sound they make when they've been damage, but not blown and if I cnrank them hard enough, it will definitely blow.

I'm not sure if other woofers work this way.
Post Reply

Welcome to the Gearslutz Pro Audio Community!

Registration benefits include:
  • The ability to reply to and create new discussions
  • Access to members-only giveaways & competitions
  • Interact with VIP industry experts in our guest Q&As
  • Access to members-only sub forum discussions
  • Access to members-only Chat Room
  • Get INSTANT ACCESS to the world's best private pro audio Classifieds for only USD $20/year
  • Promote your eBay auctions and listings for free
  • Remove this message!
You need an account to post a reply. Create a username and password below and an account will be created and your post entered.

Slide to join now Processing…
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Similar Threads
Thread Starter / Forum
EngineEars / Low End Theory
erikjamesmusic / So much gear, so little time
alexbutterfield / Low End Theory
hollywood_steve / Remote Possibilities in Acoustic Music and Location Recording

Forum Jump
Forum Jump