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Problem with low frequencies in 8040

danielr, modified 9 Years ago.

Problem with low frequencies in 8040

Youngling Posts: 4 Join Date: 1/6/12 Recent Posts
Hi there , I have a pair of 8040's and one of them is experiencing a vibration noise at lower frequencies. It may be related to this thread

viewtopic.php?f=4&t=680

Is the driver broken or is this frequencies outside it can't handle as it was very low end sinewave sounds. It's only happening on one speaker though.
ilkka-rissanen, modified 9 Years ago.

Re: Problem with low frequencies in 8040

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

It is quite impossible to say which one is it with this little background information. Can you tell me more about the signal and the required SPL? How much earlier (in dB) does the "broken" speaker start to distort before the other speaker? Are any of the DIP switches engaged?
danielr, modified 9 Years ago.

Re: Problem with low frequencies in 8040

Youngling Posts: 4 Join Date: 1/6/12 Recent Posts
Hi sorry about that , i'll try and get you more info tommorow.
danielr, modified 9 Years ago.

Re: Problem with low frequencies in 8040

Youngling Posts: 4 Join Date: 1/6/12 Recent Posts
Hi I haven't had time at all. I ran the sound fx through paz and it was possibly under its freq response range thats what the problem was. Im on another project now and see if other rumbly stuff causes the issue.

I dont know how to check for SPL / frequency response unless I do a sweep right ? According to the setup manual I activated one of the bass tilt dip switches , I dont remember what it was for but its the second dip switch. Perhaps I should put a hard roll off but I dont have a sub yet.
ilkka-rissanen, modified 9 Years ago.

Re: Problem with low frequencies in 8040

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

You don't need to perform a sweep. If you can access an SPL meter, you could check how much sound pressure you can achieve before the vibration noise happens. Also it would be good to know how much louder the other speaker can be played before any noise.
danielr, modified 9 Years ago.

Re: Problem with low frequencies in 8040

Youngling Posts: 4 Join Date: 1/6/12 Recent Posts
gotcha i'll try and find the time to test this particular sound again. I do have a meter and the speakers are calibrated at 79db for my room. Ill mute each channel and see what happens. I'll also send a screenshot of the paz display if needed.