I have the KLH AV-1001B speakers and only the tweeter seems to be working. The speaker is not blown or anything. There is just no bass and I have no idea what the problem is. I turned on the music one night and they just stopped working. No wires were crossed or anything. They have been in the same spot for months, nothing out of the ordinary happen.

Open the unit and remove one wire from one of the woofer terminals and using an ohmmeter check the resistance between the terminals. It probably should be between 6 and 16 ohms... they don't give the specs on the speaker... if it is very high or infinite resistance, the voice coil is blown and you be re-coning or buying new speaker. These are close in speakers and intended for a small room for studio listening while mixing. If the speaker is OK, then the bass amp in the cabinet has a failure... pray, as that is cheaper to repair than a speaker.

For all we know you have the speakers defined as 'small' and all bass from their channels is being redirected to a subwoofer. Have you looked at the manual and adjusted all the speaker levels with test tones?

Apparently the tweeter's blown.

you want JBL Professional group if this involves the Eon product line.

1-800-852-5776

Or on the website

http://www.jblproservice.com/

You need to replace the tweeter sorry!

KLH 900B tweeter specifications: 6 ohm, 40 watts. By the way, KLH's QC for speakers could be improved. One of my 900B tweeters quit because the spacing for the voice coil was way off reasonable tolerance and the body of the speaker coil base pillar (ie: magnitized part) was off-center - and cauesd the coil to ware and short. I contacted KLH but they did not respond.

Trash. Don't run your bass through speakers not designed for it. Likewise (from personal experience) don't allow microphone feedback to get into consumer speakers. Bye-bye tweeters in either case.

If you have a Ohm Meter, check the resistance to the speakers. If it is very high, the speakers are burned, (or the crossover is (just capacitors, and resisters...cheap)). If it is close to 4 ohms check the wiring and connectors..to and at the speakers, most likly the receiver/amp is not blown.

Hi oddone

You may have a problem with either blown tweeters, or a faulty cross over, or both. If you have a multimeter, you can remove the tweeter, and check it DC resistance. They normally have their impedance marked on the back of the magnet. If not, you can assume they should measure 8 ohms. If they measure open circuit (high resistance), then they have failed.
A good speaker repair guy can often fix an open circuit tweeter as they often break where the very fine wires attach from the voice coil to the terminal. you can take a turn of the voice coil and reterminate to solve this problem. If the voice coils are burnt, they will need to be replaced.
If the tweeter meters ok, then you may have a problem with the crossover capacitors going dry. Generally they are 2.2uf to 6.8uf in value, the smallest cap in the crossover. If the plastic coating on them is split, or they look a different colour to the rest of the caps, replace them, if they sound "hollow" replace em, if you are not sure, replace em. other than that there is not alot more to look for with a speaker box tweeter Good luck and happy listening.

If you have any dramas, get back to me here and we can talk more about it.

regards
Graeme

hi, have u first disconnected the tweeters and then checked, as if its on a cross over, the tweeter is in series with a capacitor,if u have a ohms meter or a continuety tester check the tweeter coil if its open,secondly you can have the coil replaced, check if u can get one before buying a new,let me know