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Old 31st October 2004, 07:26 PM   #1
Miha is offline Miha  Slovenia
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Default Visaton FRS8 line array & W170S

My first DIY project is almost finished.
You can see plans athttp://plorec.comcom.si/images/sisters.pdf .
More pictures http://foto.volja.net/view-album.php...&album_id=7925 .
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Old 31st October 2004, 08:31 PM   #2
Salas is online now Salas  Greece
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Did you measure it?
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Old 31st October 2004, 08:37 PM   #3
Miha is offline Miha  Slovenia
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Sorry I do not have the appropriate equipment for measurment, but i think they are a little shy on highs. (fullrange drivers)
Maybe with a new crossover the things would be better.
THX for replay.
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Old 1st November 2004, 09:41 AM   #4
Salas is online now Salas  Greece
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FRS8 takes some running in time to expose more highs in my experience. But this is sorted out in a few days time. But in your case I would be afraid of comb filtering above 4.5Khz and less energy (even down by 6dB) in the last octave due to this. I would consider bringing in a supertweeter with a small capacitor (1uf or less) in the crossover.
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Old 1st November 2004, 10:02 AM   #5
Jennice is offline Jennice  Denmark
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I've seen this comb filtering thing mentiones several places... is it a phenomenon which is due to the placement of several drivers next to each other, and a ratio of the wavelength between the driver centers? (just guessing here).

Please do enlighten me...

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Old 1st November 2004, 01:19 PM   #6
Salas is online now Salas  Greece
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Comb filtering bugs recordists each time they pick up a single sound source from several differently distanced mics. They better space their mics x3 the source distance to closest mic to soften the phenomenon.
When your ear picks up same source signal from different points like from several FR drivers in the example speaker here, an inverse to the recordist problem occurs with same outcome. Yes the frequency that it will start depends on physical separation between drivers relative to wavelength. The aural result of comb filtering is an audio signal that sounds hollow, diffuse, and thin.
Lobing problems occur with several drivers also. 3 drivers lobe better in a vertical array than 4.
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Old 1st November 2004, 02:33 PM   #7
Jennice is offline Jennice  Denmark
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And "lobing" would be... *giving a dumb blonde look*

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Old 1st November 2004, 07:30 PM   #8
Salas is online now Salas  Greece
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Lobing is jargon for worsening polar response. The lobes you can see in such a graph are created differently than with a single driver's graph when more drivers interact or crossovers modify phase.
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Old 2nd November 2004, 05:12 AM   #9
Jennice is offline Jennice  Denmark
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When 3 drivers "lobe" better than 4, is that because there are fewer point sources, or because it's an odd number (3,5,7...) per side?

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Old 2nd November 2004, 08:10 PM   #10
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Because odd.
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