3" full-range speaker design help

valvesound · 5th December 2011, 12:07 PM

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.

sreten · 5th December 2011, 12:26 PM

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.

valvesound · 5th December 2011, 12:47 PM

Hi streten, thanks for your reply.

Could you elaborate on a pair of NS3's in a 0.5 way sealed design please?

valvesound · 5th December 2011, 02:11 PM

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.

Jim Griffin · 5th December 2011, 02:31 PM

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

planet10 · 5th December 2011, 05:07 PM

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

sreten · 07:47 PM

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.

jimbro · 5th December 2011, 09:11 PM

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.

valvesound · 6th December 2011, 05:33 AM

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?

valvesound · 6th December 2011, 06:08 AM

oops!...I see the TN25 only comes in 5ohm. any suggestions?

5th December 2011, 12:07 PM	#1
valvesound diyAudio Member Join Date: Jun 2011 Location: Johannesburg	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.

5th December 2011, 12:26 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

5th December 2011, 05:07 PM	#6
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	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 __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

5th December 2011, 07:40 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow Last edited by sreten; 5th December 2011 at 07:47 PM.

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5th December 2011, 12:47 PM	#3
valvesound diyAudio Member Join Date: Jun 2011 Location: Johannesburg	Hi streten, thanks for your reply. Could you elaborate on a pair of NS3's in a 0.5 way sealed design please?

5th December 2011, 02:11 PM	#4
valvesound diyAudio Member Join Date: Jun 2011 Location: Johannesburg	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.

5th December 2011, 02:31 PM	#5
Jim Griffin diyAudio Member Join Date: Jun 2003 Location: Tennessee	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

5th December 2011, 09:11 PM	#8
jimbro diyAudio Member Join Date: Nov 2010 Location: somewhere in Texas	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.

6th December 2011, 05:33 AM	#9
valvesound diyAudio Member Join Date: Jun 2011 Location: Johannesburg	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?

6th December 2011, 06:08 AM	#10
valvesound diyAudio Member Join Date: Jun 2011 Location: Johannesburg	oops!...I see the TN25 only comes in 5ohm. any suggestions?

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