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Multi-Way Conventional loudspeakers with crossovers

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Old 30th June 2009, 11:02 AM   #161
gainphile is offline gainphile  Australia
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From:
http://www.mcaudio.co.uk/segovia.htm



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Old 1st July 2009, 04:03 AM   #162
CLS is offline CLS  Taiwan
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LOL !

The bass section looks just like a powerful cooling fan of industrial use!

I'm wondering if it can also 'blow' some air like that
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Old 1st July 2009, 06:00 AM   #163
picowallspeaker is offline picowallspeaker  Italy
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To CLS - note that the tube is an "H" frame , the purpose of it , is to prevent wave cancellation at low frequencies - don't be silly ! I hope ,too, the magnet won't get over heated ...
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Old 18th July 2009, 08:44 AM   #164
gainphile is offline gainphile  Australia
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Tekton OB + box hybrid monitor:

http://www.tektondesign.com/ob45.htm


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Old 20th July 2009, 01:47 AM   #165
CLS is offline CLS  Taiwan
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I'm wondering if a cardioid response is the goal...

Quote from the web page:

<This is a true dipole solution....

The hybrid dipole functions perfectly... >

A true dipole solution by the hybrid dipole, hmmm....


OK then.

At the first glance I thought there should be a chamfer cut on the rear. It's indeed there (from another picture in its web page), but the motor is just so big....
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Old 20th July 2009, 06:11 AM   #166
gainphile is offline gainphile  Australia
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I've done dipole+box hyrbid like this configuration before. They didn't sound right.

Especially how the woofer is pointing upward and that nasty resonance port to the front. It would be interesting to see what the on axis and off-axis measurements like.
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Old 20th July 2009, 08:51 AM   #167
CLS is offline CLS  Taiwan
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Quote:
Originally posted by gainphile
I've done dipole+box hyrbid like this configuration before. They didn't sound right.
... .
Could you please elaborate?

This guy seemed get a pretty good result (?) I'm not sure, can't read the articles. The diagrams look pretty good, though.


http://kotisivu.dnainternet.net/anukaa/
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Old 20th July 2009, 09:28 AM   #168
chris661 is offline chris661  United Kingdom
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I've made some, with smaller drivers, and no ports. Sound good to me. Will post pics when finished.

I might have read Gainphile's response wrong, but the idea of the rear driver is to cancel the backwave of the speaker, thus reducing bass cancellation to a minimal, then the front wave of the driver is free to send bass into the room, instead of around the baffle. Hence, the rear driver is in phase with the OB driver, but (personally) I don't think the ports are a good idea, because the rear driver should follow a similar excursion curve to the OB driver, so adding a port would create a dip in excursion at port tuning, thus reducing the cancelling effectiveness around that frequency.

Overall, the idea is that you get the nice midrange and treble of OB, and bass which wouldn't get cancelled.

Chris
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Old 20th July 2009, 01:21 PM   #169
gainphile is offline gainphile  Australia
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Hi, when I tried it basically it was dipole mid/high with ported sub. About 100Hz xo. If I remember the subjective presentation of the sound is "disjointed". Similiar symptom with box speakers, but different too. I've also heard similiar DIY product with the same presentation as well as electrostat + bandpass sub (Whise?).

I'm sure if measured from the front and back the polar response will be omni and becoming directional like normal box speakers. This may explain the characteristic of such combination.

Of course you will get the expected benefit such as "bass punches".

My subjective preference is when the response is kept relatively uniform. Sealed box is not bad at all if they are kept omni to high frequency, such is my cloned pluto. In fact the pluto's mid is very hard to beat. The "disturbance" is when the polar response changes, it seems.

One day I'd might try a "reverse" which is omni mid-high combined with dipole sub to "prove" the theory.
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Old 20th July 2009, 10:31 PM   #170
jerome69 is offline jerome69  France
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My passive open baffle
Click the image to open in full size. Click the image to open in full size.

The dimension are 102cm height x 40cm large x 30cm deep. Weight 18kg.
The drivers are :
Peerless SLS135 830669
Peerless SDS134 830656
Vifa DX25TG05-04
The frequency response -3dB 50Hz to 25kHz.
Point of crossover 500Hz and 2500Hz.
Sensitivity 82.5dB +-2.5dB.
Impedance 4ohms. Minimum 2.9@43Hz.

see here for a little more details.
http://www.diyaudio.com/forums/showt...12#post1884612
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