I am wondering if there is a large difference with covering a panel fully in CLD with the usual materials on top vs only 30% CLD with the same dampening on top.
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Simple answer: How important is the weight of the car vs the sound isolation/deadening/whatever TO YOU.
I don't want to sound like an an ******* but at MORE THAN double the weight (not nearly) is there any real surprise that it wins out in terms of overall damping? IMHO I would say hell no and get Dynamat (et al). That's just me though
Peace
The first part of your answer seems correct to me but also incomplete.Simple answer: How important is the weight of the car vs the sound isolation/deadening/whatever TO YOU.
I don't want to sound like an an ******* but at MORE THAN double the weight (not nearly) is there any real surprise that it wins out in terms of overall damping? IMHO I would say hell no and get Dynamat (et al). That's just me though
Peace
You are correct in that each person must decide for themselves how much money and time they want to spend deadening their vehicle in order to enhance it as a mobile SQ "listening room". Weight of materials used to both damp and quiet a vehicle is important to some people as it ALSO directly effects mpg, suspension ride, door hinge longevity in addition to the quietness and betterment of the vehicle as a listening space.
In terms of there being no surprise as to the weight and/or density of KKK as being more effective then other CLD, I believe you may be wrong as I am ALSO suggesting that it will contribute to the effects , or even partly replace the need for, 1#/SF MLV as long as it is used at 100% coverage
That being said, further experiments need to be done to actually determine if 100% coverage of KKK CLD is not only effective in reducing panel resonance, as we already know that it is, but also effective in also quieting the vehicle as MLV does, thus either reducing the need for using a thicker MLV, or PERHAPS even eliminating the need for it altogether given that it has near the same density as MLV and the importance of density in BLOCKING sound.
OK...yeah got you. Just as a side note what I said was a statement designed to elicit some discussion...the mention of it being incomplete was based on assuming what you have put forward is correct.
Prove me wrong!
A really interesting topic and I look forward to any further discussion mate
Definitely agreed in terms of the weight factor. To me (personally) that just rules it out straight away. To guys with bigger 4WD's and stuff that is likely not such a concern
Peace
The peak resonance in the panel was at ~85Hz. Adding 28.5% CLD widened the "Q" of the resonance and changed the peak frequency to ~73Hz and reduced it by ~14dB. 95% coverage pretty much entirely removed that peak resonance as well as reduced overall resonance below that peak beteen 5-6dB.
And I am not sure where you cross your midbasses, but I can't count the number of times I have seen people trying to push the crossover lower and lower on their door mounted mids. Including people (and some manufacturers) running "full range" or with very low (<30Hz) high pass filters. If I had to guess, most people have their door mounted midbasses crossed between 60-80Hz. Want to guess what frequency range is creating the most energy in the door in that case?
Hmmmm.....I think you have a valid point. 80Hz is a very common crossover point. 14 dB is significant, but you get the whole enchilada with full coverage.The peak resonance in the panel was at ~85Hz. Adding 28.5% CLD widened the "Q" of the resonance and changed the peak frequency to ~73Hz and reduced it by ~14dB. 95% coverage pretty much entirely removed that peak resonance as well as reduced overall resonance below that peak beteen 5-6dB.
And I am not sure where you cross your midbasses, but I can't count the number of times I have seen people trying to push the crossover lower and lower on their door mounted mids. Including people (and some manufacturers) running "full range" or with very low (<30Hz) high pass filters. If I had to guess, most people have their door mounted midbasses crossed between 60-80Hz. Want to guess what frequency range is creating the most energy in the door in that case?
I hope we all have robust door hinges!
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