Visaton FRS8 line array & W170S

Miha · 31st October 2004, 07:26 PM

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 .

Salas · 31st October 2004, 08:31 PM

Did you measure it?

Miha · 31st October 2004, 08:37 PM

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.

Salas · 1st November 2004, 09:41 AM

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.

Jennice · 1st November 2004, 10:02 AM

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...

Jennice

Salas · 1st November 2004, 01:19 PM

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.

Jennice · 1st November 2004, 02:33 PM

And "lobing" would be... *giving a dumb blonde look*

Jennice

Salas · 1st November 2004, 07:30 PM

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.

Jennice · 2nd November 2004, 05:12 AM

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?

Jennice

Salas · 2nd November 2004, 08:10 PM

Because odd.

1st November 2004, 10:02 AM	#5
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	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... Jennice __________________ I get paid to break stuff. My g/f gets paid to play with children. Life is good.

1st November 2004, 02:33 PM	#7
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	And "lobing" would be... giving a dumb blonde look Jennice __________________ I get paid to break stuff. My g/f gets paid to play with children. Life is good.

2nd November 2004, 05:12 AM	#9
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	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? Jennice __________________ I get paid to break stuff. My g/f gets paid to play with children. Life is good.

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31st October 2004, 08:31 PM	#2
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Did you measure it?

31st October 2004, 08:37 PM	#3
Miha diyAudio Member Join Date: Feb 2004 Location: Lukovica	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.

1st November 2004, 09:41 AM	#4
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

1st November 2004, 01:19 PM	#6
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

1st November 2004, 07:30 PM	#8
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

2nd November 2004, 08:10 PM	#10
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Because odd.

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