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Genelec 8030A monitor problem

silso, modified 4 Years ago.

Genelec 8030A monitor problem

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
Hi everyone!
one of my genelec 8030A has a problem.. in low frequencies it sounds noisy (and it is noisy in general in high volumes). i added a picture of the recording of the sound from the monitor to be explicative.
How much am i going to spend if i would like to repair that? i live in Italy, where should i ask?
and.. is repair really necessary for this problem?
Thanks everybody
ilkka-rissanen, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi,

it is not clear what might cause the noise by looking at those pictures. Would it be possible to post the actual recordings (as .mp3 files)?
silso, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
Sure, here they are! thanks Ilkka

https://drive.google.com/folderview?id= ... sp=sharing

edit: this problem is similar to this: viewtopic.php?f=4&t=879

in fact it is a buzz in lower frequencies at high volume

i opened the monitor but i notice that there was no loose part and everything was in place and nothing was broken at first sight
ilkka-rissanen, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi,

Thank you for the files, they are much helpful! There is definitely some additional buzzing sound present on the other speaker. It can either be the actual woofer making the noise (it's broken) or something else inside the speaker is being excited by the woofer.

Since you have already opened up the speaker, you could check one thing. On the 8030, the distance between the transformer fixing plate and the woofer magnetic shielding cup is very small. In some rare cases we have noticed they can make a contact (metal to metal) which can cause similar buzzing noise. If that happens, you should place something soft between those parts to prevent them from touching each other. Does the noise change in any way if you rotate the speaker to different positions?
silso, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
thanks for your answer Ilkka! if i move the speaker (360) the problem remains, so would you advice me to try to open the speaker and place something soft (thin rubber) between the woofer and the transformer (is it the toroidal?)?
And if that doesn't solve the problem, how much am i going to spend to change woofer?

Edit: is it possible to open the speaker and turn it on to play something to see if the vibration is coming from behind the woofer? i know that maybe it is a bad idea because of risk of electric shocks but if it is safe enough i would like to try that (maybe if i use rubber gloves?)
ilkka-rissanen, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
You could try placing a thin rubber between the woofer and the transformer (it is the toroidal). Price for the new woofer (part+work) is approximately 75 EUR (here in Finland) but you should ask accurate price from our Italian distributor.

Leading Technologies s.r.l.
54, Via Solferino, I-20052 Monza (mi), Italy
T + 39 039 94 15 200
F + 39 039 21 03 506

It is possible to open up the speaker and turn it on but I can't recommend this because it would be against the electrical safety regulations. It is always advised that only professional service personnel are allowed to open up a speaker.
silso, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
Hi Ilkka! may i ask you if it is possible buy a woofer spare part from the Genelec headquarter there in finland and ship here in Italy? or if there is some website selling it worldwide? Because Italian distributor seems to ignore my requests (and from what i understood from their behaviour the repair period is going to be very long and the costs would be very high) so i have to do that by myself.
And, is it possible to order the woofer+magnet part (all the block) or it is only the woofer that costs around 70 euro?
Or is it possible to ship my broken woofer to Genelec Finland to be repaired?

Here ares the videos of how the woofer works at low frequencies. note, in the second video, how the woofer stabilize itself after a short initial shocking attack when starting or raising quickly the volume of a low frequency sound (120 Hz).
the first video is a sweep from 50 Hz
Do you think that is the problem of the entire woofer or only of the surround rubber?


https://docs.google.com/file/d/0B8uMPjx ... sp=sharing
https://docs.google.com/file/d/0B8uMPjx ... sp=sharing


Thanks a lot
ilkka-rissanen, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi,

All Genelec spare parts are shipped from Finland and distributed by our official distributors. The response from our Italian distributor sounds very strange, I will contact them myself to see if they have maybe misunderstood your question.

I noticed looking at your video that the magnetic shielding cup looks little strange. There should be a foam ring around the magnet so that the metal cup can't touch the magnet. It looks as if parts of that foam ring are missing? Can you remove the spring that holds the cup and pull out the cup to check if the foam ring is there? If the cup is touching the magnet, it might be the reason for the noise it is producing.
silso, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
Thanks Ilkka, look what i found under the shield:

https://docs.google.com/file/d/0B8uMPjx ... sp=sharing

part of the foam is broken (don't know why?!)
could be this the cause of malfunction of the woofer? i think magnet isn't touching the shield anyway, but maybe vibrations transmit through that empty foam space?

How can i proceed filling that foam hole? what kind of glue or what kind of foam should i use?
And, if fixing it doesn't solve the problem, does the spare woofer part is already assembled to the magnet ?
ilkka-rissanen, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
A small missing piece of foam doesn't matter unless the cup is physically touching the magnet. Can you test to play the sweep without the shielding cup and listen if you can still hear the noise?
silso, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
The problem remains, during the sweep the woofer keeps playing a noise (like if a paper sheet was placed over it) until 200 Hz when it become inaudible.
(I forgot to write that the buzz noise i talked about in the first posts was caused by the deformed front grid, i modeled it with a rubber mallet and that problem seems fixed)
Maybe for this woofer problem in very low frequencies (50-200) there's no fixing procedure..the woofer is simply gone.. i can order one and assembly by myself if the spare woofer part is already assembled to the magnet ..
ilkka-rissanen, modified 8 Years ago.

Re: Genelec 8030A monitor problem

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Yes, it does sound like there is no fix other than replace the whole woofer. The spare woofer will come with the shielding cup attached. I have contacted our Italian distributor about the spare part order. They should reply soon! :)