Hi Allen,
This symptom indicated that your speaker cone and coil was mis-alligned already. This is due to wear and tear and excessive bass exposure. The only way that it will back to normal again is to alligned the cone through shop where speaker rewinding is accepted. But this is sensitive, you must look for the shop expertise in speaker repair to have a good quality of sound as new one.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
A warp coil surrounding the magnet will cause this problem
Get it rebuilt is the only way out to remendy this situation
The buzzing can be caused by pick up of the transformer hum.
This is usually avoided by having a screen on the cable to the speaker. Try checking the connections of the speaker to maker sure that it is earthed to the chassis of the amplifier.
I found the following extract from an article on speakers wich you may find interesting:-
"I went ahead and modified a couple of my own drive units and ran earth wires down to the mains earth. The results were both easy to hear and very beneficial. First there was improved clarity, definition, and depth in the bass. Second, improved separation between instruments, singer etc. and more three-dimensionality in the soundstage. Third, the treble was clearer, sweeter and cleaner. Removing the earth, the sound seemed muddled, confused and much less rhythmic and enjoyable.
The result was so worthwhile that we designed the Russ Andrews Quave LS1 loudspeakers with an earthing terminal for the drive units.
You can test this upgrade fairly easily for yourself without having to modify the drive unit. When you remove the speaker grille, you will find the tweeter(s) and one or more drive units held in with screws. Tackle only the drivers and tweeters with metal bodies."
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i tested by switching the speakers , the vibration noise from the woofer at low LFand only affecting one same speaker. i do not hve such problem before and i do not suspect its a hum issue from transformer.
pl advise further
thank you
dear David,
i first noticed it 2 week ago while playing "spainish halem" with the low plug bass. it does not happen to higher frequency tracks, this was on the right speaker.
i fastidiously checked thru all connection and even replace my pre amp input and ou put tubes to see if its the pre amp problem.
I then swaped my mono block from right to left. same problem.
i swaped the speaker from right to left and now the problem is on the left!
that surmises its speaker problem and i can identify its the woofer and not the tweeter by careful listening.
the woofer physical property is perfect.
could it be due to the driver, woofer cone, or the electonic?
what can be done to verify the root cause short of bring it to repair shop?
Thank you
who can perform this job? its no easy feat i guess.
its a propritory design by aad and is there a replacement woofer for it since this model is discontinued some years ago?
i rather sent it back to aad if they are still around.
pl advise
yes, your last advice one cone mis alignment is probably true as verified by a local tech.
thanks for the solution!
thank you jd.
yes, your comment is has helped me to confirm the problem and point to a plausible solution.
cheers,
Allen
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