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Old 30th May 2014, 09:19 PM   #21
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I have 4 Aurasound NS10-794-4a woofers. I am going to build 4 passive sealed subs powered by either Cinepro 2k6mk3 (6x600W/4ohm) or if I need more power Cinepro 3k6mk3 (6x800w/4ohm). Both can be bridged. I would like to stick to 2k6 as its 2 channels are driving Abbeys now and I want the remaining 4 channels to be used with the woofers. I hope it is fine as I dont want to change woofers at this moment. It took a lot of effort to find and get them to Poland.

http://www.quint-audio.com/qaudio/files/ns10-794-4a.pdf

The point is I have 20m2 at my disposal so I have to build as small subs as possible. Otherwise I will get divorced.

Last edited by dziemian; 30th May 2014 at 09:23 PM.
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Old 4th June 2014, 12:56 AM   #22
Pallas is offline Pallas  Pakistan
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Quote:
Originally Posted by dziemian View Post
I have 4 Aurasound NS10-794-4a woofers. I am going to build 4 passive sealed subs powered by either Cinepro 2k6mk3 (6x600W/4ohm) or if I need more power Cinepro 3k6mk3 (6x800w/4ohm). Both can be bridged. I would like to stick to 2k6 as its 2 channels are driving Abbeys now and I want the remaining 4 channels to be used with the woofers. I hope it is fine as I dont want to change woofers at this moment. It took a lot of effort to find and get them to Poland.

http://www.quint-audio.com/qaudio/files/ns10-794-4a.pdf

The point is I have 20m2 at my disposal so I have to build as small subs as possible. Otherwise I will get divorced.
The smaller amp will be plenty of power for those wonderful woofers. If you need more bass, you'll need more efficient woofers in bigger boxes, not more power. The Achilles' heel of the Aurasound woofers is that the short underhung voicecoil* can't take as much power as an overhung coil. (Also, some of them had dodgy plating on the radial neo magnets.) They're beautiful pieces, though, and I know of nothing else with that much throw that can play so smoothly well above a sub's nominal bandwidth. The JBL WGTi "car" woofers are close on both counts, and can handle a lot more power. But the dust caps are just so ugly.

FWIW, I ran my NS10-794-4A (used as an "above the centerline" sub in a Geddes-style setup with an NS15 in the front corner and three NS12's on the floor) in an 18L closed box. Really strong motor on those woofers.

*Consider the difference between the Aurasound NS15-992-4A and the old JBL "SUB1500" that was in the original Revel Ultima sub. Both have 4" diameter voicecoils and model nearly identically down low. (The NS15 can play cleanly about 2 octaves higher.) The NS15 has a longer throw. However, the NS15's underhung voicecoil is about an inch long (~25mm). The SUB1500's overhung coil is nearly 20mm longer, which means it has that much more copper to dissipate heat and that much more surface area to use for heat dissipation.
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Last edited by Pallas; 4th June 2014 at 01:10 AM.
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Old 4th June 2014, 08:12 PM   #23
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I have to check it. We have diffrent listening rooms here in Europe. Usually much smaller, with concrete walls. People tend to have one sub only while I will have four. And I dont listen to music at high level. I didnt know what to choose to set them up so finally I have an older BSS 9088ii and Minidsp coming to Poland and I will borrow a DCX2496. That way I will check what is the easiest way and sell the remaining equipment.

At some point I was thinking about JBL WGTI and I would buy it if I didnt find Auras at good price. I am not so experienced as you are but I read and learn a lot from this and similar forums. So thank you guys for all your answers.
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Old 5th June 2014, 03:43 AM   #24
Pallas is offline Pallas  Pakistan
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Originally Posted by dziemian View Post
I have to check it. We have diffrent listening rooms here in Europe. Usually much smaller, with concrete walls. People tend to have one sub only while I will have four.***
To be clear, I think you'll have more than enough output and extension for most reasonable uses with those four woofers in 15-20L closed boxes. And enough headroom to do whatever EQing you need to do, too.

The real point of my earlier post was that your six-channel amp will be fine for both the Abbeys and the 4 NS10's. More power won't give you any benefit. (Never mind that going from 600W to 800W even in ideal conditions is barely more than a 1dB level increase.)
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Old 11th June 2014, 11:09 AM   #25
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I have checked a polarity with polarity checker in my Abbeys yesterday. It looks like I have a reversed polarity either in woofers or CDs. Is it supposed to be like this? I mean the pair of either drivers has a reversed polarity in relation to another pair. I heard that it is not so uncommon and sometimes the design demands such a move.
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Old 11th June 2014, 11:11 AM   #26
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Earl, Please let me know if this is not a proper thread or you want me to PM you with these kind of questions in future.
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Old 11th June 2014, 02:47 PM   #27
gedlee is offline gedlee  United States
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The woofers should have positive polarity but the tweeters are out of phase from the woofers. This is quite common. But the over all polarity should be in-phase.
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Old 11th June 2014, 04:20 PM   #28
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Thank you for your reply. Can you advice how to check the over all polarity in my system with various phase and out-of phase drivers?
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Old 11th June 2014, 05:21 PM   #29
gedlee is offline gedlee  United States
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Look at the impulse response. The highest peak should be positive, otherwise the system is out of phase.
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Old 8th July 2014, 06:41 AM   #30
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Hi Earl,

I noticed that you use the B&C DE500 1" compression driver on your new NS15 Summa. Other than "I like B&C products", and "the DE500 is small and light", what criterion won the selection?

I have never seen nor heard the B&C DE500, just reviewed the company literature. The DE500 uses a 1.7" titanium diaphragm, and the SPL/freq measurements from B&C would suggest a 900Hz - 1000Hz Xover point. The BUZZ is that titanium diaphragms are not optimum for home use due to high frequency break-up, but I suspect this concern is mainly from 3" and 4" diaphragms.



Do you have any experience with left-right, side-firing, counter-force woofers under your NS15? Any general technical information on counter-force woofers?
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