Decware DNA Horn - diyAudio
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Old 5th May 2013, 05:20 PM   #1
xrk971 is offline xrk971  United States
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Default Decware DNA Horn

In the Foam Core thread, I posted the Decware DNA BLH to see if there was any interest in doing a DIY version of it in easy foam core. See post here: Foam Core Board Speaker Enclosures?

Click the image to open in full size.

There is some interest in proceeding with it as I can see that as of now, there have been 32 views of the approximate dimensions that I posted as a pdf plan here: diyAudio

The DNA was designed for use with the now discontinued TB W5-1880 driver. In the interest of trying this design out in FC on a budget, I spec'd the following cheap 5 in aluminum cone driver from MCM: MCM Audio Select 5'' Aluminum Cone Woofer | 55-1870 (551870) | MCM Audio Select

I simulated the DNA in AkAbak with the following horn expansion profile that I derived using dial calipers from the drawing (13 segments total with the first one being the throat leading to the main horn passage. The throat width is equivalent for a 2.5 in dia hole.)

Code:
| Define Horn Segments (need to multiply by Width for area, dims in inches * 0.0254 in/m): S_Throat, S_Mouth, Length

	S1T=0.70*0.0254;	S1M=0.701*0.0254;	L1=0.18*0.0254;
 	S2T=0.64*0.0254;	S2M=0.76*0.0254;	L2=5.09*0.0254;
	S3T=0.76*0.0254;	S3M=1.30*0.0254;	L3=5.09*0.0254;
	S4T=1.30*0.0254;	S4M=2.01*0.0254;	L4=16.08*0.0254;
	S5T=2.01*0.0254;	S5M=2.88*0.0254;	L5=6.03*0.0254;
	S6T=2.88*0.0254;	S6M=2.89*0.0254;	L6=1.47*0.0254;
	S7T=2.88*0.0254;	S7M=4.02*0.0254;	L7=3.35*0.0254;
	S8T=4.02*0.0254;	S8M=4.29*0.0254;	L8=1.30*0.0254;
	S9T=4.29*0.0254;	S9M=4.30*0.0254;	L9=2.68*0.0254;
	S10T=3.83*0.0254;	S10M=4.52*0.0254;	L10=1.45*0.0254;
	S11T=4.52*0.0254;	S11M=6.16*0.0254;	L11=7.64*0.0254;
	S12T=6.16*0.0254;	S12M=7.41*0.0254;	L12=3.40*0.0254;
	S13T=7.41*0.0254;	S13M=15.68*0.0254;	L13=5.23*0.0254;
The main driver chamber was estimated to have a volume of 16.1 liters, and the throat hole leading from the chamber to the start of the horn passage is assumed to be 2.5 in dia.

The result of the simulation for the DNA with the W5-1880 driver appears to go down to about 30 Hz in bass extension - not bad. This is for the speaker placed with baffle 18 in from rear wall and 4 watts of power with listening position at 3 meters away from front baffle.

For the cheap $13 MCM drivers, I had to reduce the driver chamber volume by 6 liters to 10.1 L and this provided a much better response due to the much stiffer suspension (smaller Vas). With this driver, the bass shelf is a little tilted but nonetheless smooth and goes down to 40 Hz. The last plot shows the driver cone displacement for the MCM 55-1870 driver at 4 watts. With appropriate stuffing in the main driver chamber the resonances and peaks should be reduced significantly - so ignore the sharp peaks when viewing the plots. I still have not figured out how to implement damping/stuffing in AkAbak.

The design appears to a good one and I think worth pursuing even with the budget driver - 40 Hz extension and it appears that there may be enough bass gain to avoid using a BSC.
Attached Images
File Type: png DNA-BLH-W5-1880-3m-4watts-good.png (31.8 KB, 866 views)
File Type: png DNA-BLH-mcm55-1870-3m-4watts-10liter-good.png (31.7 KB, 1049 views)
File Type: png DNA-BLH-mcm55-1870-3m-4watts-displ.png (23.1 KB, 829 views)

Last edited by xrk971; 5th May 2013 at 05:49 PM.
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Old 5th May 2013, 05:33 PM   #2
zobsky is offline zobsky  India
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The Aurasound NS525-255-8A is the recommended replacement for the discontinued tangband driver (although a tweeter will be needed. The Madisound Speaker Store
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Old 5th May 2013, 05:38 PM   #3
xrk971 is offline xrk971  United States
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You are kidding right? The W5-1880 was a $160 high Vas, high Bl, low Qts, super premium driver - one of the best offered by TB. This Aura is a budget driver and I don't believe is in the same league. I can try running a sim to see what comes out.
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Old 5th May 2013, 06:25 PM   #4
zobsky is offline zobsky  India
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Quote:
Originally Posted by xrk971 View Post
You are kidding right? The W5-1880 was a $160 high Vas, high Bl, low Qts, super premium driver - one of the best offered by TB. This Aura is a budget driver and I don't believe is in the same league. I can try running a sim to see what comes out.
Forums - DRIVERS for the DNA Horn

To quote Steve :

I have considered several different drivers for the DNA horn which can be found in the design notes for the DNA horn.

The DECWARE DNA Horn

You may use this as a guide when you consider drivers for the DNA horn.

I did try a less expensive Tang Band driver, the W5-1611SAF 5" Full Range Speaker with the world's worst results. Please don't waste your time with this one.

I also tried my small Lowther DX55 drivers and they sounded good, but are a primarily a midrange driver so there isn't any real bass weight. I will say, that the DNA horn made that driver, as well as the 4 inch foster drivers used in other horns, have more bass than they did in any other cabinet, but considering what this cabinet is capable of it would be a waste of a good design.

To that effect, I have found a driver that I like 95% as good as the TangBand IF you're going with lower powered amplifiers. In fact the bass was actually better, more correct, less colored. The highs are rolled off, but I still enjoyed it for an evening by itself without adding a tweeter, which it will obviously need. But I think that is fine. A tweeter floating on top of the cabinet would be very nice.

The driver is an AuraSound buy out at Madisound, so who knows how many they have or how long. The price is right a 3.60 ea.

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Old 5th May 2013, 06:32 PM   #5
xrk971 is offline xrk971  United States
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Well, That's great news that such an inexpensive driver can do this. From Steve himself. Thanks for pointing this out Zobsky.
Regards,
X
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Old 5th May 2013, 06:44 PM   #6
GM is offline GM  United States
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Quote:
Originally Posted by xrk971 View Post
You are kidding right? The W5-1880 was a $160 high Vas, high Bl, low Qts, super premium driver - one of the best offered by TB. This Aura is a budget driver and I don't believe is in the same league. I can try running a sim to see what comes out.
Spec wise, its mass corner works out close enough, ditto its Fp even though the filter chamber seems too small at a glance and no doubt why its bass performance is superior in some ways.

GM
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Old 5th May 2013, 07:13 PM   #7
xrk971 is offline xrk971  United States
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Here is the simulation with the Aura NS525 budget driver - very nice. Get's to down to 30 Hz.
Attached Images
File Type: png DNA-BLH-NS525-3m-4watts.png (31.3 KB, 807 views)
File Type: png DNA-BLH-NS525-3m-4watts-displ.png (23.0 KB, 109 views)
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Old 5th May 2013, 10:51 PM   #8
bcmbob is offline bcmbob  United States
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Sounds good to me. Just placed an order at Madisound. Less weight should be a better match for the FC. If there is a problem I'm sure the MCM will still be available.
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Old 5th May 2013, 10:53 PM   #9
xrk971 is offline xrk971  United States
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Bob,
Did you buy more than two? What do they charge for shipping?
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Old 5th May 2013, 11:12 PM   #10
bcmbob is offline bcmbob  United States
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I bought 4. $9.42 to get them across Lake Michigan. Was the same price as just 2.

Just did a dummy shipment to Atlanta = $10.77
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Last edited by bcmbob; 5th May 2013 at 11:16 PM.
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