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Ilkka wrote:
 Hi all,
I'm heading out on a short New Year holiday so I won't be online for a few days. But when I'm back, I will tackle all the questions regarding the subwoofers measurements you have made. 
Happy New Year to everyone! |
Hi Illka
Trust you had a Happy New Year and a relaxing holiday.
I was idling away some time today during my ski trip here in the Canadian Rockies and went looking for some spectral contamination charts for your latest sub tests and see you have not posted them. While I agree with you that the cross-section of charts does provide a pretty good indication of performance, I found the spectral contamination charts useful as all encompassing charts of distortion and noise.
As per your definition;
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Spectral contamination test will show all non-linear distortions and mechanical ‘self-noises’ (panel vibrations, driver motor noise, port noise etc.). Also the limiting circuits often became very audible during this test.
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While many readers may not appreciate its significance, this chart does provide a very useful measurement of real time performance. Generally speaking, many larger subs at higher output can produce significant port or resonance noise and do not fair as well as other subs such as several sealed subs in this area. Accordingly, it would be useful information when comparing the relative performance at high output between these two types of alignment and also among vented subs.