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Old 5th December 2011, 12:07 PM   #1
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Default 3" full-range speaker design help

Hi all,

Can anyone help me with an enclosure design please. I ordered 4 aurasound NS3's to muck around with as a first diy speaker project. (I can order another 4 if required).

i have considered a line array but can't afford 48 drivers! ... and I would need an EQ aswell which I don't have.

A simple design as open baffle could work as I plan to add these speakers to either a AV 5.1 setup with sub or to my stereo MTM setup so bass is not a problem.

I have found a backloaded horn design that uses 2xdriver per side but the construction is a bit much for the tools that I have.

Any help will be much appreciated.
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Old 5th December 2011, 12:26 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Some info on the NS3 at Zaph|Audio .

An option with 4 NS3's is a pair of 0.5 ways, sealed, 5 or 6 litres.
Will full BSC from a 0.5 way they would only suit freespace mounting.

An open baffle would need to be very large to get below 200Hz ....

rgds, sreten.
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Old 5th December 2011, 12:47 PM   #3
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Hi streten, thanks for your reply.

Could you elaborate on a pair of NS3's in a 0.5 way sealed design please?
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Old 5th December 2011, 02:11 PM   #4
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The Zaph audio design is for a single driver per box. I am really looking for an enclosure design that would take 2 or even 4 NS3's per box.
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Old 5th December 2011, 02:31 PM   #5
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A thread on my MLTL MTM with Aura NS3s is on the Parts Express Projects page at:

Jim Griffin's Aura T-line 2-way - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com

Many others have built this design and report excellent bass from this small needle shaped speaker.

Jim
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Old 5th December 2011, 05:07 PM   #6
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The Aura is a 3" that digs down deep (for a 3"). My 1st thots were much aong the same lines as Sreten's, but the ML-TL looks interesting, except that the bracing should run the length of the line, not horizontal where it constricts the line.

Gregg-the-Geek also started a thread here somewhere on a big BR he dig that digs deep,

dave
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Old 5th December 2011, 07:40 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

IMHO complex boxes are simply not required if a subwoofer is involved,
i.e. your talking the speakers being set to "small" in an AV amplifier.

With two drivers per side your choices IMO are a sealed
bipole or a sealed 0.5 way, both around 5 to 6 litres.

A 0.5 way would forgo the lower of Zaphs filters but keep the other one.
But TBH AFAICT Zaphs filters are carefully chosen, and unless volume
is an issue it will be hard to better his single driver version.

Perhaps the simplest bet is sealed 5 to 6L MTM based on the ML-TL c/o.

rgds, sreten.
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Last edited by sreten; 5th December 2011 at 07:47 PM.
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Old 5th December 2011, 09:11 PM   #8
jimbro is offline jimbro  United States
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You're right sreten a complex box is not necessary but I think it would be nice to able to listen without the sub if you're in the mood. I just like flexibility if money is roughly even.
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Old 6th December 2011, 05:33 AM   #9
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Thanks Jim, that is exactly the type of design I was looking for! I have 4 ohm drivers though, so will have to simulate and adjust the x-over to suit two in series i.s.o two 8ohms in parallel. I haven't looked at the HiVi tweeter specs but guess I should get an 8ohm version?
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Old 6th December 2011, 06:08 AM   #10
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oops!...I see the TN25 only comes in 5ohm. any suggestions?
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