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Multi-Way Conventional loudspeakers with crossovers

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Old 25th November 2009, 06:15 PM   #11
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I am afraid you don't understand anything of this Telstar.

/Erling

Last edited by skorpion; 25th November 2009 at 06:18 PM.
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Old 25th November 2009, 06:29 PM   #12
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by skorpion View Post
I am afraid you don't understand anything of this Telstar.

/Erling
I beg your pardon?
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 25th November 2009, 06:36 PM   #13
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Why should you ?

/Erling
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Old 25th November 2009, 06:38 PM   #14
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I am sorry, thread would be useless now I suppose.

/Erling
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Old 25th November 2009, 06:43 PM   #15
cuibono is offline cuibono  United States
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Originally Posted by Rudolf View Post
To the right on top of the 6.5'' midrange driver in the picture are two Dayton ND20FA-6. They are mounted back to back in a short piece of plumbing tube. Diameter of this 'point source' is 4,5 cm, depth is 3,3 cm.
I have not listened to them yet, still using the double Monacor DT 25N on the left. But the Daytons are almost half that size and should be even better imaging.
I have a handful of ND20FB drivers I've meant to do the same thing with - the only issue I see is power handling. Tell us if they burn! Otherwise, they look to be very good for the application.

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Originally Posted by skorpion View Post
Regarding baffles and No baffles, Gainphile seems to take a step 'backward' with this new baffle and Rudolf, as always, going front to improve our stereo sensation.

Couldn't the two of you settle this discussion, also provoced by Stig-Erik's thread, of baffles or no baffles, small or more substantial, by measuring various baffle sizes and no baffles at different angles. I suggest 1 m distance and 15, 30 and 45 degree angles, in room measurement. This would be very clarifying for our future developments.

/Erling
There are lots of measurements around the forum - the results are fairly simple - the smaller the baffle, the higher the dipole peak. Dipole speakers maintain a uniform off axis response up to about the dipole peak, then it degrades. (Additionally, the magnet/frame structure interferes with things in the 1-2kHz range.) The compromise with smaller baffles is more low end loss of sensitivity. How anyone wants to apply this is up to them and subjective.
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Old 25th November 2009, 06:48 PM   #16
cuibono is offline cuibono  United States
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Originally Posted by gainphile View Post
This one is to build a true open baffle with its simplicity (no h/w/u -frame etc.) I think there is something about them which other variation simply can't match.

Obviously the low-end output is severely limited .
Looks nice! I enjoy your explorations. Something to consider wrt the 'sound' of your woofers is that you are probably pumping more power into them - so if you wanted more things to 'worry' about, you might be getting more heating in the voice coil, and distortion from your amp. Just food for thought. I worry about this stuff, but only a little.

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Old 25th November 2009, 06:49 PM   #17
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Cuibono, thanks !

I was not really aware of your observations. I can see that baffle size is very much dependent of subjective thoughts and some objective overwiews regarding baffle size. Possibly the 2.2 rule of thumb would be the best then ?

/Erling

Last edited by skorpion; 25th November 2009 at 06:56 PM.
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Old 25th November 2009, 07:28 PM   #18
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About the Daytons, if you ask me they are a bit low in sensitivity. I have used the Monacor DT28N but they may also be less omnidirectional than you would like.

/Erling
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Old 25th November 2009, 07:35 PM   #19
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I think I may have abandoned my first question too fast ? May be baffle and no baffle is a more fundamental question ?

/Erling
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Old 25th November 2009, 09:21 PM   #20
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Originally Posted by gainphile View Post
My only explanation is, with h/u frames the polar response is not as uniform as simple OB.
Does it matter much at and below 125Hz? I don't think so.

Would you post some measurements?

By the way, nice looking speakers.
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