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Old 29th January 2005, 11:52 PM   #1
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Default Neo 8 xover help

If I am running active xover for the Neo8 planar drivers, do I need the series cap before the Neos as if they were true ribbon tweets or am I safe without?

Greg
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Old 24th February 2005, 08:54 PM   #2
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Well a series capacitor may be agood idea if for nothing else but to keep any turn on/off thumps or low frequency hum from reaching the drivers.
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Old 19th May 2006, 12:41 PM   #3
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What's your XO frequency and slope?
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Old 24th May 2006, 11:20 PM   #4
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Default No Capacitor

The in series capacitor for a ribbon is due to the very low resistance of a ribbon (as opposed to inductive impedance). From my readings on other BG products (the RD series), BG states that the load is comparable to 4/6 ohm resistor (ie not frequency related inductance) so no capacitor would be required.
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Old 25th May 2006, 11:31 AM   #5
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What's your active XO frequency and slope?
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Old 30th May 2006, 02:16 AM   #6
Hans L is offline Hans L  Netherlands
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Quote:
Originally posted by gp4Jesus
What's your active XO frequency and slope?
I seems studiotech taketh answers but giveth none away

Remind me of your question in a few weeks. I should have a suitable xo for the Neo, probably combined with a Peerless HDS205 Exclusive, or perhaps one size smaller.

Hans.
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Old 15th November 2006, 12:31 PM   #7
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from Hans
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Remind me of your question in a few weeks
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Old 15th November 2006, 05:34 PM   #8
Hans L is offline Hans L  Netherlands
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Quote:
Originally posted by gp4Jesus
from Hans
Hi,

My experience so far is rather mixed. I've been using it in a dipole housing, which takes too much out of the range roundabout 1KHz and lower. The latest filter is a 3rd order filter (butterworth-like) at approximately 700Hz which results in an acoustical slope of a near textbook LR 4th order at 800Hz. A 3rd order acoustic slope at 800Hz would also work fine, but 4th happened to turn out better and less complicated in this setup. Maybe that will change when I go to a closed housing in the final design because of the low end boost compared to dipole.
I'm using the non-PDR version, which needs a rather heavy notchfilter at about 12KHz for the on-axis peak (which disappears rather fast when going off-axis). Since I'm using a digital crossover, terribly convenient during prototyping, I've done some more curve tweaking at 3-4KHz (slight dip) and above 18KHz to flatten the response. The Neo is currently behind a shallow (about 2") waveguide, which helps the dip in the response at and below 1KHz a bit.

The way it is set up now (as mid and tweeter in a dipole housing) is not working to my liking. I've heard ppl being extremely enthousiastic about the Neo8 used all the way up to 20KHz, but to my ears, that doesn't work very well... For one, you need to put your head in a vise in order to hear 'optimal performance' because the treble range is so damn directional concerning the big peak in the upper treble. Once you have your head in the mandatory vise, no matter how much you tweak the response, you're always left with a very large deviation between the on- and off axis response in the treble range which makes the speaker very picky about room acoustics and placement (this was the primary reason for me to try a few waveguides in order to mediate that problem). It's rather hard to find an 'optimum'. Getting is wrong is easy, resulting in either a dull overal treble or some sharp edges that find their way to your ear via the room boundaries.

After trying a fee weeks to get the Neo8 to behave, I asked Danny from GResearch, where I had purchased the units, what his experience with this driver was and he confirmed my findings, saying that's why he doesn't use it as a tweeter. In the meanwhile, I've also tried the Neo8 in a closed housing, which improves the low treble as opposed to an open baffle, but obiously does nothing for the uppper treble. I'll probably get a pair of Neo3 soon to put on top of the Neo8 as a proper tweeter. As far as its midrange goes, it's great, performs way, way beyond its price.

Hope that helps.

Hans.
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Old 15th November 2006, 07:28 PM   #9
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Hans
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I've also tried the Neo8 in a closed housing, which improves the low treble as opposed to an open baffle, but obiously does nothing for the uppper treble.
keep me posted on what worked for you. If I could "acousticallly fill in" below about 1K that would be good. I'd like to XO them @ 600-700. I have a TDM; active, analogue, 4th order with infinite adjustability. The 12K peak is another matter; I can't hear above 16K, so that problem doesn't concern me.

thanks and good luck.

tony
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Old 15th November 2006, 08:40 PM   #10
ScottG is offline ScottG  United States
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Quote:
Originally posted by Hans L
Hi,

My experience so far is rather mixed. I've been using it in a dipole housing, which takes too much out of the range roundabout 1KHz and lower. The latest filter is a 3rd order filter (butterworth-like) at approximately 700Hz which results in an acoustical slope of a near textbook LR 4th order at 800Hz. A 3rd order acoustic slope at 800Hz would also work fine, but 4th happened to turn out better and less complicated in this setup. Maybe that will change when I go to a closed housing in the final design because of the low end boost compared to dipole.
I'm using the non-PDR version, which needs a rather heavy notchfilter at about 12KHz for the on-axis peak (which disappears rather fast when going off-axis). Since I'm using a digital crossover, terribly convenient during prototyping, I've done some more curve tweaking at 3-4KHz (slight dip) and above 18KHz to flatten the response. The Neo is currently behind a shallow (about 2") waveguide, which helps the dip in the response at and below 1KHz a bit.

The way it is set up now (as mid and tweeter in a dipole housing) is not working to my liking. I've heard ppl being extremely enthousiastic about the Neo8 used all the way up to 20KHz, but to my ears, that doesn't work very well... For one, you need to put your head in a vise in order to hear 'optimal performance' because the treble range is so damn directional concerning the big peak in the upper treble. Once you have your head in the mandatory vise, no matter how much you tweak the response, you're always left with a very large deviation between the on- and off axis response in the treble range which makes the speaker very picky about room acoustics and placement (this was the primary reason for me to try a few waveguides in order to mediate that problem). It's rather hard to find an 'optimum'. Getting is wrong is easy, resulting in either a dull overal treble or some sharp edges that find their way to your ear via the room boundaries.

After trying a fee weeks to get the Neo8 to behave, I asked Danny from GResearch, where I had purchased the units, what his experience with this driver was and he confirmed my findings, saying that's why he doesn't use it as a tweeter. In the meanwhile, I've also tried the Neo8 in a closed housing, which improves the low treble as opposed to an open baffle, but obiously does nothing for the uppper treble. I'll probably get a pair of Neo3 soon to put on top of the Neo8 as a proper tweeter. As far as its midrange goes, it's great, performs way, way beyond its price.

Hope that helps.

Hans.

Hans.. you might try rotating the driver "outward" ("toe-out" as opposed to "toe-in") by 45 degrees from your listening axis and then adding in a tweeter on-axis to fill-in the remainder final ocatave and a half. This should give enhanced imaging out of the speakers "boundries". It will however enhance the "power response" at higer freq.s and like require a more extended lower freq. response to "balance" the sound.
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