Bastanis DIY Forum

RE: Prometheus bass xover slope

212.23.103.36

In Reply to: RE: Prometheus bass xover slope posted by Paul Folbrecht on December 24, 2007 at 12:08:21

Hi,

the acoustical slope of the woofers which fits the baffles perfect measured nearfield is 12dB/oct.. In room it depends on the behaviour of the woofers in the frequency area above the crossover point (for example some customers combine open baffle woofers which typically produce a peak at around 200Hz and a constant falling graph below this frequency) and on the in room behaviour of the open baffles. In most cases, even with perfect matching Bastanis woofers you`ll get some minor ripples in the in room- graph of the amplitude in the crossover- region. This ripple is caused by the interactions between speakers and room - every speaker gets affected by this, typically in the range below 300Hz. The active powered woofers allow a more flexible compensation of this room influences than any passive speaker although the result won`t be perfect. A more perfect result regarding the amplitude is possible by using a DSP based crossover and measurements at listening- position but even by this you can`t compensate a bad in- room woofer placement.
The most important points for good bass response is a woofer which matches the widebands and the room, good placement and proper phase- settings. When you get some ripples in the graph up to 200Hz from not perfect matching slopes this isn`t disturbing.

Regards
Robert Bastani

http://www.bastanis.com (Open in New Window)

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