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Multi-Way Conventional loudspeakers with crossovers

Crossover point for Scan-Speak Drivers - Opinions needed
Crossover point for Scan-Speak Drivers - Opinions needed
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Old 27th March 2005, 02:25 PM   #51
Vigier is offline Vigier  Netherlands
diyAudio Member
Join Date: Nov 2002
Location: Netherlands
Differences between R2904/700000 and the Vifa XT300K/4:

The SPL response of the Vifa is better than the SS up to 20k (read: more flat), and it reaches its flat line at a lower frequency
Above 20k, the SS has less deviation from the "zero-line".

Waterfall: under 3kHz the SS is much better, flat after 0.5msec. (flat means more than 25db under zero).
Between 2 and 5 kHz both units have some small peaks at 15 to 20dB under zerom and both dead after about 1.2 msec
About 5kHz the SS is JUST a little better, flat after about 0.3 msec.

Impulse repsonse: The SS is absolutely better here. The distance of the swing back (if it passes zero after the pulse) is about 60% higher for the Vifa.

Distiortion at 90dB average:
2n order: Up to 3kHz it's almost equal, from 3k to 7k the Vifa is a little better, and above 7 k, the SS is a lot better (the SS is at 0.1% while the Vifa is at 0.7%)
3rd order: in the lower frequencies the SS is WAY bettter: SS is at 0.3% at 500 Hz, while the Vifa is at almost 3%. At 1K they're around 0.1%.
The SS drops below 0.1% above 2.5kHz, while the Vifa stays around 0.03% up to 6kHz.
5th order: the SS has a little peak at 800Hz (there it's at 0.03%, and besides that it's under 0.01% from 500Hz to 20 kHz. The Vifa is between 0.01% and 0.03% from 500 Hz to 2k. Above that it's under 0.01%

Hmm...descibing graphics ghehehe

Grtz, Joris
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