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Old 21st February 2013, 05:11 PM   #11
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Quote:
Originally Posted by AlliumPorrum View Post
Yeah, it seems that NEO-10's really are a good match for GR's.

But how about RD-50? Can it go well down to 200hz, if steep (48 or 96db) crossovers from DEQX would be used? Twelve pieces of NEO-10 is quite expensive setup anyway, and two RD's could be bought for under half of the price of NEO's.
There seems to be some disagreement on how low to run the RD series. BG says to 200Hz is OK and StigErik runs them(RD75) that low in his system, but other guys out there try to get off of them by 500Hz or roundabout there. I've never personally played with any and only heard them in Genesis designs and a few other DIY efforts. Both designs used super tweeters in addition to the RD.

Greg

Last edited by studiotech; 21st February 2013 at 05:14 PM.
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Old 21st February 2013, 06:15 PM   #12
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How did you like them, Greg?
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Old 21st February 2013, 08:56 PM   #13
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I preferred the Neo10/Neo3 combo to the RD50 in my experiments, for what it is worth.
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Old 21st February 2013, 11:05 PM   #14
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Quote:
Originally Posted by AlliumPorrum View Post
How did you like them, Greg?
If you mean the RD drivers, it's been too long to make a fair judgement. At the time, I was in love, but the more we learn and design, the more critical our tastes become.

If you mean the Neo10, after testing a dozen or so drivers for mids on my project, the Neo10 won. If you are going passive, they are not the easiest to use due to their rising response, but on the other hand, crossovers behave much more as theory would suggest due to their flat resistance and inductance profiles. For active, there are few mids I've heard that top a well implemented Neo10. The newer Neo8-S version is also nice and can play quite a bit lower than the old Neo8. I just used one in a prototype for a new studio monitor and it's working well so far. Crossing at 425hz from the Discovery woofer and 3KHz to the OEM Raal.

Greg
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Old 23rd February 2013, 08:00 PM   #15
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It seems to me you are missing a link here, woofers! It seems like you are trying to go from mids to sub-woofers. I have the Neo-3's, Tang Band W4-1337SD 4" titanium FR's for mids and a Velodyne 15" sub, and was hoping to go dipolar, but have come to realize that for now I just don't have the room or budget. While I can't pursue my dream of bipolar, I am working on a kind of shoestring tri-amp system using a DBX-234, mostly switching off the amps I use in my proletarian HT system (that uses NHT Super Ones), I'm figuring out what 7"-8" woofers I'm going to use as woofers, and waiting for this Chinese 10-watt Class A amp for the 3's.

When I was still dreaming bipolar I had decided on Nelson Passes slot woofer idea, The Slot Loaded Open Baffle Project Article By Nelson Pass and had even stumbled on some place selling surplus drivers mad cheap that would make 8-12 drivers quite affordable- Speaker Stuff. Sir Pass originally used 6 8" drivers a side, but I figured using 8 of those 10" Infinities would only be 100$ a side and probably go deep enough to eliminate any need for a sub for just music (for HT it would still be good), maybe going with the 6-8inchers a side would be better with a sub, but that site has some reasonable offers there too. Since I don't have room for OB's I'll be putting those 8inchers in 1 cu. ft. sealed enclosures I got cheap until I can work out some transmission lines to put them in. Not my dream system, but not too shabby for a blue collar stiff like me. Hey with the powered sub, I'll be beyond tri-amped...
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Old 6th April 2013, 06:36 PM   #16
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Oh, I just noticed your old message, Dante.

Why should I use separate "woofers", if GR's basses can go up to 300hz (I surely would not call them subwoofers) , and NEO10's (or RD's) can go down to 150hz? If I cross them over near 200hz, shouldn't it be working just fine?
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Old 17th April 2013, 08:07 AM   #17
DeonC is offline DeonC  South Africa
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My vote would be for the RD75 ribbons. As mentioned, Stig Erik uses them and loves them.

Quote:
Originally Posted by AlliumPorrum View Post
Why should I use separate "woofers", if GR's basses can go up to 300hz (I surely would not call them subwoofers)
AFAIK, if used with the servo amps, these can only go as high as 120Hz. So if you say 300Hz, do you mean without the servo feedback? It would be great if they did go that high with the servo feedback, so I'm wondering (and hoping) that my information is incorrect. Please tell me more.

Thanks,
Deon
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Old 17th April 2013, 08:25 AM   #18
DeonC is offline DeonC  South Africa
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Have a look at this thread. Skip past the first few pages. Here is where Stig Erik discusses his implementation of the RD75.

My open baffle dipole with Beyma TPL-150

Deon
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Old 17th April 2013, 09:15 AM   #19
DeonC is offline DeonC  South Africa
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Quote:
Originally Posted by DeonC View Post
Have a look at this thread. Skip past the first few pages. Here is where Stig Erik discusses his implementation of the RD75.

My open baffle dipole with Beyma TPL-150

Deon
Ok, so it is more than a few. Start from post #1011 and onwards. Lots of valuable info there.

Deon
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Old 17th April 2013, 10:57 AM   #20
Toaster is offline Toaster  United Kingdom
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Those who have listened to both the older tech. RD series and the newer Neo 3/8/10 series seem to favour the latter. I've not heard the RDs, but own all the above Neo drivers, which are excellent. The Serenity Super 7 I linked to earlier uses four Neo 10s crossed over at about 250Hz to the GR servo 12" drivers, which are driven by the matching Rythmik plate amp. Yes, the servo is active. No reports of any integration problems. One thing that might be significant depending on your choice of power amplifier; four Neo 10s run series/ parallel have a sensitivity of 96dB vs 88dB for the RD75. Power handling should be quite a bit higher than one RD too. No axe to grind though- as long as implementation is good I'm sure the RD series sounds great- too many positive experiences from users for it to be otherwise- and they will run low enough to meet the GR 12" drivers, depending on how loud you want to go. For the Neo 10s (depending on how many you are using per channel) and the RD75, the practical crossover range is the same, from about 250Hz and up. Either way it'll be a great speaker system!

Last edited by Toaster; 17th April 2013 at 11:03 AM.
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