Looks like classic performs better in all area's
Btw something looks fishy about the drop at high freq. I'm not sure if it is correct. I assumed a drop since I had it but not this drastic and for both models exactly the same. I think something goes wrong in the calibration or limit of a soundcard. The drop is to heavy. Try looking up some of my measurements to see if they compare at all. Since I got higher then 12 kHz with the mist heavy paper I used even plastics got above 12 kHz if I remember correct.
Last edited:
I wish I could tell 🙂 , one thing the big cuts won't work since this is the part where mid low freq is generated.
There is obviously something wrong in the equipment above 12 kHz , the phasing you see is abnormal. Try to do a closer measurement to see if it is not the room etc. moving you mic slightly of axis should increase high end drasticly , since the high freq has a null in the center slightly of axis it will climb
Try using holmimpulse it is a. It simpler , and works like a charm, I start out with holm for fast measurements. Then hunting resonances I use rew since it has a spectrum analyzer
Am am trully happy anyway. As you can see i beat the c..p out of the high frecv. I'm proud of this aspect. Now all it remains is to smooth the frecv peaks somehow and oberve and smooth the resonances.
I have to measure the triangles too and i'm still confused about the peak in hights...
Cant wait to hear you response Wrine.
Cheers
Sergiu
I have to measure the triangles too and i'm still confused about the peak in hights...
Cant wait to hear you response Wrine.
Cheers
Sergiu
The first pic from right to left is off axis, the center is on axis, and the first is also on axis.. Forgot to mention in the pics. I think this program (holmimpulse) is abit unclear and needs some more fields here and there...I'm abit dissapointed in it.
something still is wrong.. first try to let it show the raw response. not gated!
then there is still something weird going on with the calibration files or something. the drop in holm does not look normal. also the huge peak now in REW looks weird to.
it looks like in the calibration files it just ads almost 20 dB above 10khz... no speaker has such peak in that direct line, at least i never seen one.
im uploading a video for ya at this moment , about my contraption 🙂 will be there in 2 hours on this link
https://youtu.be/br5fy6ntmXw
then there is still something weird going on with the calibration files or something. the drop in holm does not look normal. also the huge peak now in REW looks weird to.
it looks like in the calibration files it just ads almost 20 dB above 10khz... no speaker has such peak in that direct line, at least i never seen one.
im uploading a video for ya at this moment , about my contraption 🙂 will be there in 2 hours on this link
https://youtu.be/br5fy6ntmXw
Hi Wrine,
Thank you very much for the video. That was really nice but like a little thin.. I caught that melody with shazam and will show you how it sounds on my versions (back sliced and unsliced). I liked it. I think that you need a bigger ruban, with this small one you miss the bigger picture. That is not how its supose to sound. I propose to you when we will finish the final tests and find a final version that you should build a bigger one.
What material do you use on those membranes?
To be honest i dont think that you used a very thick AL foil. I think this is a bad ideea. Let me tell you what this thicker material did to me. At the begining i had 4 ohms, and when i measured the coil today it had only 2 ohms. I tooked the membrane out and found that when i cranked the volume (just 10w) up the coil was too stiff and heated more than it should and moved inside the central portion and shortcircuit some traces wich is not normal. I did the same at the 8ohm ruban and at 38w on the Hiraga these things didnt happend.
So a thicker foil is a no go if allot of superglue is not used....
Aniway. Here it is the raw measuremnt. I didnt understand a thing from it. The very strange thing is that i used the same calibration file in the same programs.. Very strange.
I will verify and test again on monday. Thanks again.
Cheers
Sergiu
in real life it does not sound that thin, i can assure. its the iphone 6 that does that. 🙂 in the vid there is NOOO bass at all in real life its a decent amount way to much if i compare it to the measurement.
Hmm well i did not had any problems as of yet with shifting coils. the alu i used is a 35 micron alu foil with adhesive. stick it to one of the papers with the existing adhesive, and for the other paper i used this new method. i used the hot melt glue band you can buy when you make curtains (like ikea) its a mesh looking stuff that is actually hot melt in a mesh form. you can apply it without it sticking , then you grab an cloth iron and heat it up the glue will melt and bond the 2 surfaces together.
i kind of wondered how you got to 8 ohms cutting it by hand ? mine had 6 turns of 1.6 mm and i reach 1.5 ohm
Last edited:
I thought that something was wrong because the graps showed allot more base. 😀
Interesting way of sticking the membranes you have there. I will search to see if i find it in romania.
I think that in the time you where gone on this forum you where cutting the coil arent you? 🙂
I have to say sincerely that i got actually 9 ohms. You should go to a local shop for backening and search for backing Al foil, and look for the thinest one. That is what i use for such high impedance. My thinking behind this was the we need very high efficiency and not allot of power and was having in my mind greater dinamics.
If we are thinking logically you have 20cm ruban and 1,5ohms and i had 50 cm at 4ohm so its reacheble.
Very nice video. Cant wait to see the next one.
Cheers.
Sergiu
Interesting way of sticking the membranes you have there. I will search to see if i find it in romania.
I think that in the time you where gone on this forum you where cutting the coil arent you? 🙂
I have to say sincerely that i got actually 9 ohms. You should go to a local shop for backening and search for backing Al foil, and look for the thinest one. That is what i use for such high impedance. My thinking behind this was the we need very high efficiency and not allot of power and was having in my mind greater dinamics.
If we are thinking logically you have 20cm ruban and 1,5ohms and i had 50 cm at 4ohm so its reacheble.
Very nice video. Cant wait to see the next one.
Cheers.
Sergiu
well for a smaller version power handling is key 🙂 you got way stronger magnets so you dont need that much power, you also ahve more surface area 🙂
for low end i should supersize 🙂 but i dont need very high efficiency, so maybe stack 2 x 30 cm ruba's with even smaller magnets?
i wish i could print a3 paper size 🙁 since thats the only limiting factor (that and money for magnets of course) wat i also wonder is what happens when you make the whole thing bigger but only drive it from the middle ? for instance i make a 30 cm rubanoide but only use a 20 cm coil and magnets. what i think will happen is it will still drive the whole thing in the low end, but not so much in the high end. it might balance some stuff out , i will give it try someday. and what if you make the circles bigger as in wider not so much create deeper V shape at the front so it will ***** up the high end. but just sideways
another option is, i use 2 coils, for instance the 20 cm ones, then glue them above each other but with a gap of around 5 cm, i wonder how that would sound, in this way you could make them as tall as you want. and you could even lowpass the bottom ones just to add bass reinforcement.
it does become costly in the magnet department to go tall 🙁
hmmmmm my magnets cost around 2.3 euro a piece. yours 3.80 or something. if i could get magnets 20mm x 40 mm for around 1 euro a piece, but slightly thinner(mine are 5mm). you could add 4 Cm of rubanoide for 2 euro 🙂
for low end i should supersize 🙂 but i dont need very high efficiency, so maybe stack 2 x 30 cm ruba's with even smaller magnets?
i wish i could print a3 paper size 🙁 since thats the only limiting factor (that and money for magnets of course) wat i also wonder is what happens when you make the whole thing bigger but only drive it from the middle ? for instance i make a 30 cm rubanoide but only use a 20 cm coil and magnets. what i think will happen is it will still drive the whole thing in the low end, but not so much in the high end. it might balance some stuff out , i will give it try someday. and what if you make the circles bigger as in wider not so much create deeper V shape at the front so it will ***** up the high end. but just sideways
another option is, i use 2 coils, for instance the 20 cm ones, then glue them above each other but with a gap of around 5 cm, i wonder how that would sound, in this way you could make them as tall as you want. and you could even lowpass the bottom ones just to add bass reinforcement.
it does become costly in the magnet department to go tall 🙁
hmmmmm my magnets cost around 2.3 euro a piece. yours 3.80 or something. if i could get magnets 20mm x 40 mm for around 1 euro a piece, but slightly thinner(mine are 5mm). you could add 4 Cm of rubanoide for 2 euro 🙂
Last edited:
Or you could ask the seller above. I calculated better prices on that site.
Cheers
Sergiu
Wrine, my friend,
It looks that something fishy is going on here. And i suspect that this is because i dont have a mic preamp. I take the signal from the mic and injected straight into the mic input to the pc with mic boost for satursday measurements and no mic boost for today...
Look bellow. What do you think?Am i right?
Ps: my opinion is that small triangles withe the back cutter is more smoother.
Cheers
Sergiu
It looks that something fishy is going on here. And i suspect that this is because i dont have a mic preamp. I take the signal from the mic and injected straight into the mic input to the pc with mic boost for satursday measurements and no mic boost for today...
Look bellow. What do you think?Am i right?
Ps: my opinion is that small triangles withe the back cutter is more smoother.
Cheers
Sergiu
Attachments
Still the huge hump is abnormal,and the holm ones are completely wrong 🙁 look at my latest measurements in the video. Something technical is wrong. Best and simplest would be a cheap mic preamp with phantom power and your done no more weird results.
I am sitting in the train with 1 and 3 mm foam board and some funny looking paper . 1mm foam board is rather heavy in comparison to the 3 mm variant. Well when I got time I'll do some tests. I might remove the foam or the paper partially to create a lighter coil an or the area near the coil. But I am not convinced it will work , it feels to heavy and maybe to sturdy
I am sitting in the train with 1 and 3 mm foam board and some funny looking paper . 1mm foam board is rather heavy in comparison to the 3 mm variant. Well when I got time I'll do some tests. I might remove the foam or the paper partially to create a lighter coil an or the area near the coil. But I am not convinced it will work , it feels to heavy and maybe to sturdy
Thank you very much.
I just found a cheap kit to do (with decent results) for the future experiments. But for now a friend of mine will borrow me tomorow.
Cant wait to see your results with the foam.
Cheers
Sergiu