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A DIY Ribbon Speaker of a different Kind
A DIY Ribbon Speaker of a different Kind
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Old 10th December 2017, 03:22 PM   #1131
OLEGsan is offline OLEGsan  Belarus
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Understood thanks.
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Old 13th January 2018, 08:56 PM   #1132
sergiu2009 is offline sergiu2009  Romania
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Default finished project at last!!

Hello and a happy new year to you all,
In december 2017, in my holidays i just finished my speakers, and forgot to post. Here are some pics with the finished rubas, bass, cables and filters.
You may not see many changes but they are all actually repainted and everything has now the finishing touches. I added a burned wood effect on the sides of each ruban and aded some handles. Those speaker cables are 6*2.5mm wires twisted two by two, then braided and have 3m long, and the + and - are holded together by wooden supports at 10cm distance from each other. This may be overkill but i noticed that cables do affect the sound abit..
The filters are basically butterworth but fine tuned to eliminate the peak at 220hz. The caps used are pp filled with oil motor run (posted a pic where i made a burn in with them at 220v mains for 10mins ) bypassed with pio and pp caps for the rubas and litics for the bass.
Cheers
Sergiu
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Old 13th January 2018, 09:04 PM   #1133
sergiu2009 is offline sergiu2009  Romania
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The place for the filters is actually on the floor, but didnt had enought space. I really need a bigger listening room spacewise and soundwise.
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Old 14th January 2018, 12:59 PM   #1134
adason is offline adason  United States
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sergiu, can you post final measurements? Not only on axis, of axis too, say up to 45 degree...thanks
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Old 14th January 2018, 03:20 PM   #1135
sergiu2009 is offline sergiu2009  Romania
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Hi adason,
The measurements are what i want too because my second good computer that's still working is my old dual core tablet. My pc died at the begining of december 2017 from a current surge from the mains.... It will take me 2-3 months from now on to make a new one so please be patient with me.
Till then i have taken by good a measurement that i posted a few pages back with the ruban and the woofer in free air. The ruban measurements should remain valid because i used exactly the same type of implementation and everything else as that one but cannot say the same for the bass..
The off axis of the ruba should be tiny bit better with the peaks and dips moved abit to the high frequencies compared to the on axis responce but wil remeasure that too.
Cheers
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Old 14th January 2018, 03:30 PM   #1136
sergiu2009 is offline sergiu2009  Romania
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Quote:
Originally Posted by sergiu2009 View Post
Hello my friend,
I forgot to post a pic with the 15 inch woofer+ ruban. After the listening sessions i dissasembled th ruban to make the final coils and seen that the gap was smaller and rubbing as i sayed earlyier. Here are some measurements. The mic was at the level of the frame of the 15 " bass and after i measured the bass, i positionned the mic perpendicullary, on axis at the level of the round edges of the ruba cils, with the bass disconected, to measure the laq+wax almost finall version prototype ruba..
I listened to this interesting combo and making adjustments for about 2 hours then diassembly everithing. The filtering was second order for bass and first order for ruba(300hz cutting point). The ruba was positionned 10cm in the back (still on axis with the bass) for my bass tastes to be fullfilled .
The sound was very powerfull (at 10W mono@jlh 69 amp @75% volume from the phone), in a way that i could barelly hear my wife speaking (from almost a meter a way, where she was) in a listening room of 20sqm at 3 m away from the speakers. The sound quality was even more staggerring now with the adenum of the bass. Its pitty that the ruban cant go lower than 150~200hz. Its interesting how the bass contures and spices everithing up.
Cheers
Sergiu
Click the image to open in full size.
Ps: the measurements where made with no filtering. I cutted the frequencies from REW, then joined the graphs togheter.
Here they are..

Last edited by sergiu2009; 14th January 2018 at 03:41 PM.
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Old 14th January 2018, 05:00 PM   #1137
OLEGsan is offline OLEGsan  Belarus
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Many thanks to all for the advices, especially Sergiu 209 and Wrinex.
I have made my own(until the test) version.
The chinese magnets ( 49x9x9mm) are declared N50.
Steel magnetic circuit (CT-3) - 15x6x25cm
The gap is 3.3 mm, the copper coil wire 0.14, 8 Ohm.
The coil is made as in # 969 on a mandrel with БФ glue.
The weight of the coil is 1.19gr.
Membrane-paper 200gr \ m (I will redo from 120 gr \ m)
The sound really liked, surpasses everything I heard before.
Click the image to open in full size.

Click the image to open in full size.

Last edited by OLEGsan; 14th January 2018 at 05:24 PM.
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Old 14th January 2018, 07:13 PM   #1138
sergiu2009 is offline sergiu2009  Romania
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Nice Olegsan, i like the, i'm glad that we could help. Try thinner elastics that are sleeved in a cottone mesh because they last longer than those that you use and can be tensionned harder.Happy new year and congrats!!

Last edited by sergiu2009; 14th January 2018 at 07:16 PM.
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Old 14th January 2018, 07:19 PM   #1139
sergiu2009 is offline sergiu2009  Romania
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Here is the original ruba right from its times.. They are very usefull. I just found them on a blog.
Attached Images
File Type: jpg RollLS1.jpg (438.3 KB, 113 views)
File Type: jpg RollLS3.jpg (463.9 KB, 109 views)
File Type: jpg RollLS2.jpg (55.3 KB, 90 views)
File Type: jpg RollLS4.jpg (81.5 KB, 61 views)
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Old 15th January 2018, 04:51 AM   #1140
OLEGsan is offline OLEGsan  Belarus
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Thank you, this is the initial version of the available materials.
But even it sounds amazing.
I'll make the second speaker of a thinner paper.
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