It looks like there is no liner on this tape .Nice find though.
Could be possibly to ad a liner.Liner could be baking paper.
Last measurement is one coil 10my. alu on 12my 3m tape.That is the way almost all my earlier membranes are made.Before the 40my alutape.
Bernt
Could be possibly to ad a liner.Liner could be baking paper.
Last measurement is one coil 10my. alu on 12my 3m tape.That is the way almost all my earlier membranes are made.Before the 40my alutape.
Bernt
there is a liner. they say you can cut pices out of it since it has a liner, so nothing is gone stick while you try to cut. but its dutch ofcourse 🙂 might had to say that part
all there stuff has liners(all the sticky stuff) so all tapes and these huge tapes of 50cm wide 🙂 50 meters long🙂 haha some roll thats gone be
it is not even that expensive to be honest. 25 M2 for 60 euro 🙂 thats pretty ok if you ask me. going to last half my life time 🙂, but i dont want to buy 60 ero of stuff again, i might do it later this month or so 🙂 i know me 🙂
all there stuff has liners(all the sticky stuff) so all tapes and these huge tapes of 50cm wide 🙂 50 meters long🙂 haha some roll thats gone be
it is not even that expensive to be honest. 25 M2 for 60 euro 🙂 thats pretty ok if you ask me. going to last half my life time 🙂, but i dont want to buy 60 ero of stuff again, i might do it later this month or so 🙂 i know me 🙂
Last edited:
I hope that you are protecting your ears, 145 dB is definitely gonna get you a hearing impairment.Just one more .
[/url][/IMG]
12-10-1 kit. 1,2 ohm diff. spl. range
Bernt
....
im not sure i use a Umik and a cal file to. a quad has Sensitivity: 86dB SPL for 2.83V rms at 1 meter
if i set my ouput for 2.83V i run a sweep and end up with over 100 db on the rew meter... not sure if there could be 14 db room gain ? over the entire frequency band
im not sure i use a Umik and a cal file to. a quad has Sensitivity: 86dB SPL for 2.83V rms at 1 meter
if i set my ouput for 2.83V i run a sweep and end up with over 100 db on the rew meter... not sure if there could be 14 db room gain ? over the entire frequency band
I was referring to båndsei's measurements; AFAIK he is using a calibrated UMIK and REW.
Also, I would prefer to measure with 1 W in and not 2,83 V that corresponds 1 W at a 8 Ω load.
When comparing sensitivite that is. Otherwise the resistance should be stated as båndsei does.
Also, I would prefer to measure with 1 W in and not 2,83 V that corresponds 1 W at a 8 Ω load.
When comparing sensitivite that is. Otherwise the resistance should be stated as båndsei does.
Last edited:
yeah i can imagine , 1 watt is more easy to compare. but just saying i am using calibrated umik and rew as well, i dont see the difference but ok.
Sorry, I thought that by "im not sure i use a Umik and a cal file to." you meant that you didn't use a UMIK and REW.
Could it be that for some reason REW has "forgotten" the calibration file or perhaps it wasn't loaded in the first place? Sorry for asking
.
No problem 🙂 i asked myself the same question i reloaded it 🙂 so maybe room gain is much higher then. I thought , but this is usually not the case in the high frequency. Or the calibration is of 🙂 I would benefit from a spl meter I guess. 140 dB would be unbearable c as well instant hearing damage. 🙂
Dangerous Decibels How Loud is Too Loud?
Dangerous Decibels How Loud is Too Loud?
140 would drive you out of the room no matter who you are.
Belive me.
I have done some high power testing. The midrange and up will cause you serious pain a little over 115 to 120.
Even with ear plugs 145 is absolutely nuts.
But.
If it is nearfield that is a totally different story.
Placing a mic within 4 or 5 mm of the diaphragm will generate a similar number.
The only point of argument I could make about the measurements id that they are made with a reference voltage instead of of one watt one meter. But as I understand it there are many different impedances.
The ones that are close to 2 ohms are quite high in relative SPL in relation to the ones that are closer to 6 ohms in impedance.
Awesome work.
Belive me.
I have done some high power testing. The midrange and up will cause you serious pain a little over 115 to 120.
Even with ear plugs 145 is absolutely nuts.
But.
If it is nearfield that is a totally different story.
Placing a mic within 4 or 5 mm of the diaphragm will generate a similar number.
The only point of argument I could make about the measurements id that they are made with a reference voltage instead of of one watt one meter. But as I understand it there are many different impedances.
The ones that are close to 2 ohms are quite high in relative SPL in relation to the ones that are closer to 6 ohms in impedance.
Awesome work.
If you have a smartphone, you can download an app perhaps.
Mostly they are accurate up to 100 dB. But you could at least get some correlation values.
Here's one for iPhone, not all iPhone's microphones are calibrated though.
But it is free, so why not test it?
Mostly they are accurate up to 100 dB. But you could at least get some correlation values.
Here's one for iPhone, not all iPhone's microphones are calibrated though.
But it is free, so why not test it?
I think something is wrong with the last measurement.
It was in the same series of measurements and the settings where the same.
Mini DSP writes that the UMIK-1 measures up to 133 db ,and my amp might not like the low impedance.
I had the idea to "calibrate" the impedance to 8 ohm for all diaphragms with series resistor.
Will try it with the latest measurement ,reading 145 db.
Bernt
It was in the same series of measurements and the settings where the same.
Mini DSP writes that the UMIK-1 measures up to 133 db ,and my amp might not like the low impedance.
I had the idea to "calibrate" the impedance to 8 ohm for all diaphragms with series resistor.
Will try it with the latest measurement ,reading 145 db.
Bernt
I don't know the shipping and import costs but this:
Dayton Audio iMM-6 Calibrated Measurement Microphone for Tablets iPhone iPad and Android
https://itunes.apple.com/us/app/iaudiotool/id580740399?mt=8
or
https://play.google.com/store/apps/details?id=com.julian.apps.AudioTool&hl=en
Along with this:
Dayton Audio iMM-6 iDevice Calibrated Measurement Microphone
Here you find the cal file.
These two items in a smart phone can give you pretty outstanding measurement capabilities.
Oh and they fit in your pocket!
Dayton Audio iMM-6 Calibrated Measurement Microphone for Tablets iPhone iPad and Android
https://itunes.apple.com/us/app/iaudiotool/id580740399?mt=8
or
https://play.google.com/store/apps/details?id=com.julian.apps.AudioTool&hl=en
Along with this:
Dayton Audio iMM-6 iDevice Calibrated Measurement Microphone
Here you find the cal file.
These two items in a smart phone can give you pretty outstanding measurement capabilities.
Oh and they fit in your pocket!
Hi Bernt, i got the massive 50cm x 50 meter roll tape 🙂 but i wondered how do you laminate? i need to make a4 paper sized laminates to use in the printer. but it is pretty hard to laminate this big size on 6 micron mylar
btw the backing is a PE kind f material, it is really easy to get it off. and for fun sake made one membrane with the foil as carrier. it did not come off , but once you peel it it is pretty easy.
btw the backing is a PE kind f material, it is really easy to get it off. and for fun sake made one membrane with the foil as carrier. it did not come off , but once you peel it it is pretty easy.
Last edited:
- Status
- Not open for further replies.