Dynaudio D260 vs D28/2 - diyAudio
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Old 15th April 2012, 12:18 PM   #1
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Default Dynaudio D260 vs D28/2

Are the Dynaudio Tweeter D260 a direct replacement for the D28/2 without any filter modification?

Are the difference between D28 and D260 easily audible?
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Old 15th April 2012, 01:12 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Going by the paper specs they are very similar, impedance and sensitivity
wise. One would expect a simple x/o for for one of them to work with
the other, though a more complex x/o with impedance compensation
would need some tweaking to properly match the Fs differences.

rgds, sreten.

http://www.gattiweb.com/dynaudio.html
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Last edited by sreten; 15th April 2012 at 01:15 PM.
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Old 16th April 2012, 08:33 AM   #3
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Thanks sreten,
I have a pair of these drivers and I thought of building boxes like this:
Dynaudio Impresion
but with D260 instead of D28/2 drivers.

I do not know how to change the filter to adapt the design to the D260. The only one information that I found is in the dynaudio "Double 17" kit where they add a RC when use a D260 driver (dotted zone in attached picture).

You think you could use for "Solen Impresion" dessign?
Or someone can recommend me a new design for this combination of drivers for small box?

Ramon
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File Type: jpg fildouble17.JPG (20.5 KB, 397 views)
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Old 16th April 2012, 10:49 AM   #4
sreten is offline sreten  United Kingdom
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Hi,

See the Sirius design on the page I linked to for a x/o for those drivers.

With solid state amplifiers you don't need the additional parallel components.

rgds, sreten.
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Old 16th April 2012, 01:14 PM   #5
system7 is offline system7  United Kingdom
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I'm not quite following this. Do you have the woofers or the tweeters already?

The tweeters are so similar as to make almost no difference, but the Dynaudio 17W75-XL (10-15L reflex) and 15W75 (5-10L reflex) woofers are rather different animals, which affects box size particularly, and come in 4 and 8 ohm versions which affects coil values.

FWIW, the tweeter Zobel comes out at 5.2-6.8 ohms and 1.5uF for Re 5.2 and Le 0.065mH. Dynaudio seem to prefer 4.7uF capacitor into 8 ohms padded tweeter, 6.8uF would reduce power handling and increase distortion. They seem to use a bass Zobel with a bigger than expected capacitor value, perhaps to rolloff the midrange a little.

For all that, First order crossovers aren't rocket science, so it's all quite doable, IMO.
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Old 19th April 2012, 06:30 PM   #6
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My goal is to build a small box with a 15W75 (4) and a D260. The most similar I've found is this kit designed by Solen but uses a D28/2 instead of a D260.

Dynaudio Impresion

I want to know if I should make any changes to the proposed filter to match my tweeter.

regards,
Ramon
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Old 19th April 2012, 09:39 PM   #7
sreten is offline sreten  United Kingdom
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Hi, again http://www.gattiweb.com/images/dynaudio/sirius4.pdf, rgds, sreten.
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Old 20th April 2012, 01:19 PM   #8
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Yes, but Sirius 4 got a 17W75 and I have a 15W75.
For the filter, are 100% compatibles?
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Old 21st April 2012, 04:31 PM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by trunkline View Post
Yes, but Sirius 4 got a 17W75 and I have a 15W75.
For the filter, are 100% compatibles?
Hi,

Sorry my mistake. I don't think the x/o is 100% compatible.

I'd just build the x/o you intended and see if the added zobel helps or not.

rgds, sreten.
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Old 22nd April 2012, 12:57 PM   #10
system7 is offline system7  United Kingdom
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I think we can divide this question into two parts.

Firstly, enclosure. 15W75 6" driver is Qts 0.4 and Vas 7.5L and Fs 55Hz. Allegedly suitable for 5-10L closed or reflex box. The Impresion is 11L reflex, and I leave it to m'learned friend sreten to say what is best, since I believe he is good at reflex. Closed box is a bit awkward with this driver Qts, IMO, but hey, you could always stuff a sock in the port to try it.

I'll have a go at the second part. BOTH the suggested crossovers are a bit naff, IMO. 2nd order bass and first order tweeter is about as awkward as it gets on phase and overlap, and is not my cup of tea at all. I'd suggest this spiffing system7 conversion of the Dynaudio Sirius crossover to pure second order and the 15W75-04's properties will work nicely and the two resistors give you a bit of adjustment. The 4.7 ohm damps down the treble energy, and the (optional) 16 ohm damps down the midrange from 1-3kHz by 2dB which is female vocal range. It's an unfussy circuit which is rather good for your purposes IMO. I just amaze myself sometimes.
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