badman said:
George Michael comes to mind
Its sugar fake sound, but nonetheless sounds a bit impressive
I just saw a TV show with Kylie, and she sure could use some of George Michaels sound, boy did she sound awful
btw, a while ago I heard a live TV transmitted concert from a brand new concert hall (danish TV)
Oh boy, it was easy to hear even through a cheap digital receiver that the sound was something very unusual
It was significant that ALL the performers sounded better than ever heard
It was clearly heard that they ALL delivered top performance
On other venues in other concert halls later on, none of the bands sounded that impressive
When I play an instrument myself, in one room it sounds close to false, and in another room much more in tune
Food fore thoughts
Is it safe to say that applying a single thin coat to any paper coned driver will not make things worse? I'd like to think that cone breakup could be reduced and any movable resonances would be pushed up. What else would I expect to happen?
You have to be careful of what you coat with.
With appropriate application you will also reduce cone self-noise (paper fibres on the surface rubbing together) and an increase in the opacity of the cone to time-smeared signal coming back thru the cone.
dave
I was thinking of coating a paper cone subwoofer to lower Fs
The stock Fs is 32Hz and I'd like to drop it down to 29 Hz or so, not a huge change but one none the less.
Would a coating drop the Fs down with measurable results or by the time I get it down to 29 Hz, it would kill the sensitivity.
I would like the 10 inch to drop in Fs and increase the cone stiffness to be used in a horn. I won't die if it can't happen--just curious and it would be a nice improvement.
The stock Fs is 32Hz and I'd like to drop it down to 29 Hz or so, not a huge change but one none the less.
Would a coating drop the Fs down with measurable results or by the time I get it down to 29 Hz, it would kill the sensitivity.
I would like the 10 inch to drop in Fs and increase the cone stiffness to be used in a horn. I won't die if it can't happen--just curious and it would be a nice improvement.
Increase mass, decrease sensitivity. That is the physics.
I've used puzzle coat for this purpose for a looong time.
If you are measuring, to get an accurate picture of how much Fs has dropped, temp, humidity & pressure need to be the same.
dave
Thanks Dave,
I measured the Fs at standard room temp with 40 to 60% humidity but will measure again before and after. At the base of the cone next to the spider is some form of coating at the narrow part of the cone. It extends about 35mm up then stops. I am assuming it is to strengthen the cone at the weak point.
At least I know the cone will suck up puzzle coat and since that has a long history behind it, figure a thin coating could not screw it up to bad. If I can get a Fs drop a Hz or two--the cone is stronger/stiffer for horn duty and I don't lose much sensitivity...I'll take it.
It will be crossed at 100Hz or lower so for sub bass duty, it should be worth the experience. For the crazy stuff, that is what Planet10 does. I don't plan on taking glue to a cone that produces vocals although clear finger nail polish will fit small rips in cones. My Tangband 3" FR came out perfectly with just a little dab.
I measured the Fs at standard room temp with 40 to 60% humidity but will measure again before and after. At the base of the cone next to the spider is some form of coating at the narrow part of the cone. It extends about 35mm up then stops. I am assuming it is to strengthen the cone at the weak point.
At least I know the cone will suck up puzzle coat and since that has a long history behind it, figure a thin coating could not screw it up to bad. If I can get a Fs drop a Hz or two--the cone is stronger/stiffer for horn duty and I don't lose much sensitivity...I'll take it.
It will be crossed at 100Hz or lower so for sub bass duty, it should be worth the experience. For the crazy stuff, that is what Planet10 does. I don't plan on taking glue to a cone that produces vocals although clear finger nail polish will fit small rips in cones. My Tangband 3" FR came out perfectly with just a little dab.
There was a member not too many years ago that had the ability to scan a moving cone and map the breakup modes. He would then develop a pattern to apply on the cone with Gem Tack glue to kill the worst offenders. I haven't run across him for a while, and his services weren't cheap(I think he did a couple for the community though) but it was much more tailored to the driver than a blanket approach. This ringing any bells?
Gedlee's speakers do not use tweeters, do they? Use tweeter, and you will find out that you need to modify the waveguide.
Why not? Can't you?
Many cheap pro woofers are above 90dB full-rangers, that's why the breakups are horrible. That's the manufacturer decision to make the driver more "useful", or more market-friendly. Once I also had the need to dampen the breakup on my 12" pro-driver with Aquaproof (this is a product to seal the roof). But before I did that, I check my other woofers. My 10" and even 8" woofers were actually better at frequencies I was aiming for (can go lower than my 12" pro-driver).
Mark MacKenzie was offering professional services for flattening drivers, but i think it was Ron Clark with the laser inferometer at work (he still owes me a pair of FE166).
dave
At risk of sounding repetitive or redundant, Dr. Geddes is right about this. Industrial processes will likely yield more consistent results than the average DIYer is capable of and good cones are not that costly, but if you have a speaker you want to improve it can well be done. I posted many measurements/methods of such changes in a fairly compact manner in this thread: Hawthorne Audio • View topic - Cone Damping--who's done it? Hey D, yes I can 
Dan
Dan
Many paper cones come with a coating from the manufacturer.
The question is in which frequency range the cone
will be used. If it is used in the pistonic range solely,
a dampening coat is quite useless and you will have
to deal with mass increase, increased Q and reduced
efficiency.
If the cone is used above its pistonic range of operation,
a dampening coat may increase quality measurably and
audibly, justifying the increased mass.
It is an interesting option for many woofers used
in a typical 2way and also for midrangers. As always, the
thickness of the coat should not be overdone and you
may need more than one try, to get it right for a certain
driver. Depending on quality of paper and overall design
- suspension etc. - there may be paper cones which are
hard to improve using a coat.
The question is in which frequency range the cone
will be used. If it is used in the pistonic range solely,
a dampening coat is quite useless and you will have
to deal with mass increase, increased Q and reduced
efficiency.
If the cone is used above its pistonic range of operation,
a dampening coat may increase quality measurably and
audibly, justifying the increased mass.
It is an interesting option for many woofers used
in a typical 2way and also for midrangers. As always, the
thickness of the coat should not be overdone and you
may need more than one try, to get it right for a certain
driver. Depending on quality of paper and overall design
- suspension etc. - there may be paper cones which are
hard to improve using a coat.
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