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self generated noise in free field

semi, modified 14 Years ago.

self generated noise in free field

Youngling Posts: 5 Join Date: 9/25/09 Recent Posts

First of all I'd like to point out a conflict in specifications: says 48 Hz - 20 kHz (± 2 dB), but ... oducts.pdf says 48Hz-20kHz(±1dB)

Likewise, says 38 Hz - 20 kHz (± 2 dB), but ... oducts.pdf says 38Hz-20kHz(±1dB)

Which one of these is correct?

Then, I would like to know all about the meaning of the specification item "Self generated noise level in free field @ 1 m on axis (A-weighted)". I notice that it's specified to be at most 10dB on 8240A and 8250A, but less than 5 dB SPL on the new 8260A. Is this a technological advance or a change in measurement? Is it rather because the 8260A has your latest technological advancements in it, or because the price allows putting even higher quality components in than the lesser models? And would this kind of advancement usually be back ported to the lesser models, if it is because it's a new tech?
christophe-anet, modified 14 Years ago.

Re: self generated noise in free field

Jedi Knight Posts: 188 Join Date: 3/23/09 Recent Posts

Thanks for your post and feedback. The small typing bug that you found was only in two pages of our Finnish Pro site - many thanks for spotting it and reporting it! The on-line specification sheet is now corrected (the right figure is 1 dB as stated in our Datasheet and Operating manuals).

Concerning your other comments and questions, here is a statement from our R&D Manager for Digital products, Aki Mäkivirta:

"Self-generated noise level specification has been rather conservative for the two-way DSP loudspeaker models (8240A and 8250A) meaning that the actual noise levels are lower than the specification we give. At the same time, we have made technical advances in 8260A to improve (lower) the self-generated noise level even further. Following the same conservative principles, it is now fair to state the lower figure for the 8260A.

Genelec continuously improves its products, including further lowering the self-generated noise levels of 8240A and 8250A as soon as it is technically possible."

Hope this is helpful.
Best regards,