Neo3 tweeter with active crossover

thisisvv · 16th September 2012, 03:31 AM

i am using a neo3 tweeter crossed over from active crossover around 5khz...just to be safe i have put a capacitor of 8uf in series with it....

amp -> capacitor ->neo3...

amp i had a B&k lying around it is 125 wpc which is way too much...

is this safe way to use it.....

Davey · 16th September 2012, 04:12 AM

An 8uF capacitor on that tweeter yields a cutoff right in 5khz neighborhood. So, it's essentially additive with your active crossover and creating an increase in the acoustic roll-off of the filter. Which may be an issue for you?

Unless your amplifier is not well-behaved, I'd go without the capacitor. Those tweeters are fairly rugged.

Dave.

thisisvv · 16th September 2012, 05:35 AM

Quote:

Originally Posted by Davey

An 8uF capacitor on that tweeter yields a cutoff right in 5khz neighborhood. So, it's essentially additive with your active crossover and creating an increase in the acoustic roll-off of the filter. Which may be an issue for you?

Unless your amplifier is not well-behaved, I'd go without the capacitor. Those tweeters are fairly rugged.

Dave.

it is an B&K st5000....i hope it stays good.... just making sure whats the best way to protect those tweeter...

V

Remlab · 07:09 AM

Quote:

Originally Posted by thisisvv

it is an B&K st5000....i hope it stays good.... just making sure whats the best way to protect those tweeter...

V

The designer of the Neo 3 uses them at 1.5khz(4th order) in his own speaker designs. That's about as confident as you can get..
http://www.bgcorp.com/PDFs/FS-420%20...20sheet%20.pdf
5khz? Don't use the cap.

studiotech · 18th September 2012, 05:12 AM

I vote for a large cap around 30-40Mfd just to be safe unless you know for certain that the amplifier has good fault protection and will not shoot massive DC out the speaker terminals if it ever dies. Call B&K and ask someone technically inclined there.

Greg

Davey · 18th September 2012, 01:55 PM

I vote against a large cap.

Series "protection" caps no longer become protection if their value is too large. Considerable deflection could be caused in a fragile tweeter (the Beo 3 not being that fragile) while the capacitor charges/discharges with slow moving turn on/off transients.

The 8uF capacitor is perfectly fine....IF it's roll-off characteristic is designed into the target acoustic crossover.

Cheers,

Dave.

thisisvv · 18th September 2012, 11:46 PM

Ok now another part i am getting Neo3 for my desktop and Neo8 for my nearfield PC listening...

i read a lot and didnt saw much of difference between two ...that Neo8 can go lower then neo3...

any other inputs and same question what capacitance to provide some safety around it...

i have a Seas 1141 and i plan to cross keep seas from 45-3000 and Neo8 from 2000 -20Khz i will be using active crossover for this as well...

and this will be open baffle...

16th September 2012, 03:31 AM	#1
thisisvv diyAudio Member Join Date: Apr 2012	Neo3 tweeter with active crossover i am using a neo3 tweeter crossed over from active crossover around 5khz...just to be safe i have put a capacitor of 8uf in series with it.... amp -> capacitor ->neo3... amp i had a B&k lying around it is 125 wpc which is way too much... is this safe way to use it.....

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16th September 2012, 04:12 AM	#2
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	An 8uF capacitor on that tweeter yields a cutoff right in 5khz neighborhood. So, it's essentially additive with your active crossover and creating an increase in the acoustic roll-off of the filter. Which may be an issue for you? Unless your amplifier is not well-behaved, I'd go without the capacitor. Those tweeters are fairly rugged. Dave.

18th September 2012, 05:12 AM	#5
studiotech diyAudio Member Join Date: Jun 2004 Location: Orlando, FLA	I vote for a large cap around 30-40Mfd just to be safe unless you know for certain that the amplifier has good fault protection and will not shoot massive DC out the speaker terminals if it ever dies. Call B&K and ask someone technically inclined there. Greg

18th September 2012, 01:55 PM	#6
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	I vote against a large cap. Series "protection" caps no longer become protection if their value is too large. Considerable deflection could be caused in a fragile tweeter (the Beo 3 not being that fragile) while the capacitor charges/discharges with slow moving turn on/off transients. The 8uF capacitor is perfectly fine....IF it's roll-off characteristic is designed into the target acoustic crossover. Cheers, Dave.

18th September 2012, 11:46 PM	#7
thisisvv diyAudio Member Join Date: Apr 2012	Ok now another part i am getting Neo3 for my desktop and Neo8 for my nearfield PC listening... i read a lot and didnt saw much of difference between two ...that Neo8 can go lower then neo3... any other inputs and same question what capacitance to provide some safety around it... i have a Seas 1141 and i plan to cross keep seas from 45-3000 and Neo8 from 2000 -20Khz i will be using active crossover for this as well... and this will be open baffle...