Dayton Audio ND105-4 ( Aura NS4 ) for computer monitors - MTM or TMM or TM ? - Page 2 - diyAudio
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Old 14th May 2013, 01:20 AM   #11
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Quote:
Originally Posted by jReave View Post
I think the greatest benefit of the drivers you're looking at is their large xmax and how low they play in relatively small boxes.
Yes, and they are narrow.
I also have the following drivers, but they all have a drawback since I'm using these speaker for my computer:

http://www.lautsprechershop.de/pdf/w..._wf182bd02.pdf
Overview of W5 Drivers_HiVi,Inc
Silver Flute W17RC38-08
Dayton RS125-08


Mostly they all need a rather large box if ported and they need a wide baffle.
Wavecor in a sealed box might not be bad. The Wavecor might be good in a sealed box, but I was hoping to cross my sub over at 50 Hz. Actually,
I will be using my computer as a cross-over so a higher frequency might be fine.

What total seemed to kill my MTM with my Dayton's or Aura is that I have to chamfer (spelling?) the back and I can't get to it. Here is my box design cross-section:
You know now that I "drew" it. I kind of don't like it
There will be a metal grill covering the top and front.
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Last edited by Jimmy154; 14th May 2013 at 01:45 AM.
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Old 14th May 2013, 07:49 PM   #12
jReave is offline jReave  Canada
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Why exactly do you want to curve the baffle like that for a pair of near field computer speakers? Seems like nothing but trouble to me with no real advantages other than perhaps a cool aesthetic?? And whether or not you front or rear mount the drivers, the inside of the baffle should be chamfered in either case.

Actually, even front mounting a driver on that curved surface is going to be a real challenge, more so as the driver gets larger. Curve the sides if you must, angle the front baffle so that it's on axis to your listening height if you want, but whatever you do, keep it flat.

You have a sub - why not use it and xo at about 80Hz? The speakers then can be as small as possible. Then you don't need to use a 7" driver like the Wavecor as a computer speaker. The Dayton RS125 is a nice little unit but sealed its f3 is up around 113Hz. Kind of high. Ported it goes lower but it only has 4mm of xmax.

Seal the ND105-8 in about 4 or 5L and you get an f3 of about 77Hz with a Qtc between .76 to .8 or so. Xmax is also 4mm but it's got a peak to peak excursion of 20mm. That means SPL up to 100dB in this alignment. That's louder than you need it. Just change your box design and rear mount them. I think you might be pleasantly surprised.

Save the Wavecor and Dayton for another build. That perhaps might be the basis for a nice 3-way.

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Old 15th May 2013, 02:41 AM   #13
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I thank you for the advice, but don't ever say
Quote:
Originally Posted by jReave View Post
That's louder than you need it.


I kind of want to use the Aura because it has double the BL as the ND105-04 (4 ohm), but I don't know if it has a big affect on the sound or transient response.
I can see how the Dayton will go lower in a sealed box.
Oops, I just remembered it doesn't matter because the kx drivers I use for my computer have all kinds of EQ possibilities.
If I do an MTM I don't know whether to wire the Aura's for 16 or 4 ohms impedance?
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Old 15th May 2013, 04:01 PM   #14
jReave is offline jReave  Canada
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I appreciate the humor but the danger to your hearing is real. Treasure it and protect it while you have it cause once it's gone, it's gone. Trust me when I tell you "we're only immortal for a limited time " - this year I lost most of the hearing in 1 of my ears after years and years of way too much loud music. Too bad I can still hear the ringing louder and more persistent than ever. I can still enjoy music but stereo is gone. Imaging, soundstaging - toast. Surround sound? Collapsed to 1 side of the room only. So do what you will of course, but you should be aware of the potential dangers and know that they are real.

Now, enough of that.
I assume you already have the Auras because the are no longer available.
Which version exactly do you have?

I just modelled the NS4-255-8F, aluminum cone, virtually identical to the Dayton ND105-8. Well almost, cause it only goes down to about 103Hz when sealed in 1.5L. And if you are so concerned about transient response then you should probably go sealed. So if your sub can go that high, then that's an even smaller box than with the ND105. Two of them MTM in 3L would probably work nicely.

Wiring depends on your amp and the xo implementation. Minimum impedance looks like about 6ohm, so paralleled is going to be closer to 3ohm minimum which many amps can handle. Series min is going to be about 12ohm which I think pretty much all can handle. Maybe someone else can concur on that? The xo may result in slightly lower min impedances so you might want to work each one out before deciding. Of course, parallel gets you 6dB more efficiency than series so that's the one most people favor. Do you have a nice small tweeter picked out so you can keep the center to center spacing as tight as possible?
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Old 26th May 2013, 02:00 AM   #15
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I tried to use an existing plastic enclosure that contained a driver that had the same exact frame dimensions as the Dayton and Aura. The case was cheap and flimsy just like the driver's frame, so I decided to reinforce the inside with fiberglass. I hadn't worked with fiberglass in about ten years and it is still awful, so I threw the enclosures away after ruining them with my fiberglass job.
Now that I think about it the flimsy enclosures fit the flimsy frames pretty well.

Anyhoodle, as you can tell I can't get over the frames, so I think I'm going to move onto the Silver Flutes, unless some one has a good reason not to. Also I don't know whether to use a neo-tweeter with them or standard tweeter. And then I have standard tweeters that I can cross-over at 2 KHz and another one that I can cross-over at 3 KHz. The tweeter crossed over at 3 can play higher with better off-axis response at the top, but the one cross-over at 2 KHz will match the off-axis response of the woofer better.
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Old 21st August 2013, 02:10 AM   #16
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Is a 2.5-way bad for near-field listing?
I was thinking of putting 1" dome tweeter and two 7" drivers about 1 meter away from my head. I think the .5 woofer would be crossed over at 100-300 Hz but I'm not sure.

Actually I kind of figured out how to cross the .5 woofer over at 100 Hz or lower, but I don't know if it's a good idea. I would just EQ the top woofer.
Also I'm concerned with the top woofer playing midrange frequencies and bass.

I can also go with tweeter 4-7 inch mid and 10" woofer for a close-range setup.
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Last edited by Jimmy154; 21st August 2013 at 02:34 AM.
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Old 21st August 2013, 03:29 AM   #17
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Quote:
Originally Posted by Jimmy154 View Post
Is a 2.5-way bad for near-field listing?
I was thinking of putting 1" dome tweeter and two 7" drivers about 1 meter away from my head. I think the .5 woofer would be crossed over at 100-300 Hz but I'm not sure.

Actually I kind of figured out how to cross the .5 woofer over at 100 Hz or lower, but I don't know if it's a good idea. I would just EQ the top woofer.
Also I'm concerned with the top woofer playing midrange frequencies and bass.

I can also go with tweeter 4-7 inch mid and 10" woofer for a close-range setup.
You would need to be further away for proper integration.

Better for nearfield would be an active fast system with a helper tweeter, BG Neo planars etc

The level attainable at this distance can easily destroy your hearing in short order (in hours if not minutes). jReave is correct, protect your ears or pay the piper.
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