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34c9 a MDD full range speakers.
34c9 a MDD full range speakers.
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Old 22nd October 2019, 08:46 PM   #61
ultrakaz is offline ultrakaz  United States
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Quote:
Originally Posted by claudiogan View Post
Hello to all
an update on the construction of the 34c9 speakers.
Thanks for the update. And thanks for sharing your innovative project(s). I'm tempted to try, but don't have the time (lots of drivers, though) right now. However, it does not seem overly complicated.....
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Old 23rd October 2019, 07:47 AM   #62
pelanj is offline pelanj  Czech Republic
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It is very easy to build and the result is worth it. Here is mine: My 34c9 (omnidirectional full range with 3FE22) build
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Old 23rd October 2019, 09:52 AM   #63
heisctamdly is offline heisctamdly
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Thanks.I'm going to try
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Old 23rd October 2019, 05:50 PM   #64
turk 182 is offline turk 182  Canada
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it's funny what some controversy can do to interest...
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Old 23rd October 2019, 07:25 PM   #65
xrk971 is online now xrk971  United States
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34c9 a MDD full range speakers.
Interesting project! I had a similar idea but different length pipes for the back loaded horn.

The PANPIPE (Pentahorn) BLH Speaker

Click the image to open in full size.

Unfortunately, I never got around to building it.
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Old 23rd October 2019, 09:10 PM   #66
claudiogan is offline claudiogan  Italy
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Quote:
Originally Posted by xrk971 View Post
Interesting project! I had a similar idea but different length pipes for the back loaded horn.
...
Unfortunately, I never got around to building it.
Hi xrk971

the PANPIPE speaker system (Pentahorn) BLH is much more complex to mount than the 34c9 project. The 34c9 has straight and side-by-side waveguides, which can be purchased ready at a hardware store.

I've already written it in other posts and I repeat: multiple wave guides have been used to optimize the omnidirectional emission (by diffraction) at all frequencies, coherent and delayed secondary sound waves described in MDD technology. The presence of waveguides of different lengths provides more options to adjust the response to low frequencies than a single path.

To this day I cannot say that MDD technology is certainly an innovation, and it improves the experience of listening to recorded music at home. It has been tried by very few people and it could be my ear that has become used to this effect. In order not to disappoint those who want to try to build an MDD project, I am studying options to regularize and extend the low frequency response with the 3fe25 loudspeaker. In any case (apart from MDD) the project of an omnidirectional and easy-to-build full-range is not trivial.

After this phase I will decide whether to do a Hi-End project or something else. I have no deadlines, no sales budget to respect. I go on for fun.
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Old 27th November 2019, 12:14 PM   #67
Pepe is offline Pepe  Sweden
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I would like to try and make a MDD for ATD Veravox 7 driver, it’s a 7” fullrange unit (italian make ��)
My wish is to mate it with a subwoofer so it only need to reach 80~150hz.
What model should I build? Can I expect the mids and highs to be as resolved as a direct radiator driver?

The woofer section Will be either tapped horn or dipole.
XO Will be active.
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Old 27th November 2019, 12:17 PM   #68
Pepe is offline Pepe  Sweden
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Some pictures and some parameters for Veravox 7
Attached Images
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File Type: jpg 6CA7B090-2DAA-47F6-BFB1-0DBE835DAE4F.jpg (517.1 KB, 56 views)
File Type: png 81B0FFBC-4713-452F-B0C9-B04D3EC34B58.png (941.2 KB, 51 views)
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Old 27th November 2019, 01:03 PM   #69
pelanj is offline pelanj  Czech Republic
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Based on my build, I would aim for the longest tube to be at ear level or slightly higher, the shortest is half of it and the rest logarithmically spaced. The easiest would be 7 tubes of a diameter close to 1/3 of the membrane diameter including the surround. I see no reason why this would not work. I use mine with a mono subwofer below ca 80 - 90 Hz.
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Old 27th November 2019, 01:52 PM   #70
Pepe is offline Pepe  Sweden
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Are the wave guides vertically directional? I wish to use just one Veravox 7 and feed it mono signal. My wish was for a fairly omnidirectional sound when seated and when I’m on my feet walking around.
How important is it that the drive unit is close to the floor, could I put the speaker on a stand to get the guides at the right level or would that ruin the design?
Of what imporance does the rear radiation of the drivar have in this design?

Last edited by Pepe; 27th November 2019 at 02:12 PM.
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