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Old 21st September 2010, 01:31 AM   #11
gpapag is offline gpapag  Greece
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Edit time for post #9 expired , so I will post the intended edit here:

PS2: Due to the fact that untreated roll carton is quite lossy, impedance plot might show an aperiodic loading. If this is the case, the exact hight of the cylinder is not important at all.

Regards
George
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Old 21st September 2010, 03:58 AM   #12
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nice pics, love the huge blue cone over the full ranger. Not my cup of tea, but nice.

Norman
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Old 24th September 2010, 01:26 PM   #13
gpapag is offline gpapag  Greece
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Thank you Norman.

Hi all

I made a smaller reflector for the tuby enclosure. This reflector, as the larger one (the circular speaker baffle as well) is made of two roll carton pieces glued together using silicon bathroom sealant. It takes 1/2 hour for the sealant to set, but it's acid smell takes 2 days to go away out in the open.
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Old 24th September 2010, 01:29 PM   #14
gpapag is offline gpapag  Greece
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The sound using the small reflector is perceived as more detailed compared to the sound with no reflector and more open and detailed compared to the sound with the large reflector.

Next, I covered (glued with office paper glue) the small reflector with kitchen aluminum foil. Contrary to what I was afraid of, the sound did not become edgy and aggressive, but one more step higher in details.
This is a good progress up to here.

Thanks for reading.

Regards
George
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Old 1st October 2010, 11:15 PM   #15
gpapag is offline gpapag  Greece
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Default Cosmetics

Dressing-up a Lady with a stretchy dress (Crepepaper)

Regards
George
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Old 3rd October 2010, 11:45 PM   #16
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Default complements

I love this idea! Nice gesture for a relative with good execution for longevity. My compliments!
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Old 5th October 2010, 07:52 AM   #17
gpapag is offline gpapag  Greece
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Thank you gvimhoof.

I enjoyed the photos of your speakers in the Gallery. Very good construction and the choise of colours is superb!!

Regards
George

PS: We are living in the same city (on a different continent though)
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Old 25th December 2010, 09:27 PM   #18
gpapag is offline gpapag  Greece
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Hi all

I have done a few changes to the speakers.
First two 6.5 inches drivers were installed. They were removed some 10 years ago from an old Ford Granada.
Some mods (whizzers removed, paper cone treated with shellac -5 passes- and plumper’s putty around the magnet) made it sound better to my ears.

Then paper roll Tube bottom raised 5cm above the floor through stands, making for an open-end pipe.
Impedance Plots:
Pink: Speaker on air.
Red: Speaker on closed-end pipe.
Green: Speaker on open-end pipe.
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File Type: jpg Original GM.jpg (414.9 KB, 17 views)
File Type: jpg Rear of final GM.jpg (402.7 KB, 17 views)
File Type: jpg impedance sweeps air-closed tube-open tube.jpg (104.9 KB, 27 views)
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Old 25th December 2010, 09:36 PM   #19
gpapag is offline gpapag  Greece
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Next, the tube top was cut ~20 degrees from horizontal. Turning each speaker around it’s vertical axis, allows for directivity and off the wall reflections control, without using reflectors on top of the speakers.

Two larger 29cm dia circular wooden baffles and wooden phase plugs were prepared and tested, but rejected by the user (“too serious looking” and “these silly projecting things” were the comments for the baffles and the plugs respectively).

Therefore phase plugs removed and wooden baffles replaced with paper baffles dressed in red.
Attached Images
File Type: jpg Wood Twin Meas.jpg (179.7 KB, 40 views)
File Type: jpg Final Red Tween.jpg (371.5 KB, 104 views)
File Type: jpg Final Red Top Close-up.jpg (371.7 KB, 38 views)
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Old 25th December 2010, 09:42 PM   #20
gpapag is offline gpapag  Greece
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Positioning the two speakers close together instead of having them separated by a distance as is normal for stereo, gives a better over all performance at least for this room and listening positions.


Freq Response:
(Pink): Tube Out.
Mic on Carpet 0.03m below Column Output

(Red): Close-Up Both Speakers.
Mic 0.3m from Speakers Center, Baffle Level , Horiz Position

(Green): Far Both Speakers.
Mic 1.2m from Speakers Center, Baffle Level , Horiz Position

(Blue): Ambient Noise. No Signal to Speakers.
Mic 1.2m from Speakers Center, Baffle Level , Horiz Position

Speakers driven through the External Ampl Headphone (L) Out.
Amp. Volume Control: Max (Fully CW)

Piezo Mic through Mic Pre to Soundcard (C-Media PCI Audio Device)Line In
Room Eq5 Settings (Log Sweep):

Sample Rate: 44.1k
Word Length 256k
Sweeps:2

Actually the merit of this “one spot” speaker placement is something that I am after some time now.
I don’t know how to test the validity of such a hypothesis-or luck of it- by acoustic measurement. I am open to suggestions.

Regards
George

<edit> First plot is with 1/48 Octave smoothing.
Second plot (1/3 Octave smoothing), for just to make trends easier to see
Attached Images
File Type: jpg raw (1-48 oct) fr resp overlay.jpg (143.6 KB, 35 views)
File Type: jpg smoothed (1-3 oct) fr resp overlay.jpg (113.4 KB, 20 views)
File Type: jpg Tween Wood-Room.jpg (179.3 KB, 40 views)
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Last edited by gpapag; 25th December 2010 at 09:54 PM.
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