Yes and kinda. There are cheaper things out there which do a better job. Its kinda heavy. Sound deadening needs mass for it to work. On my clio I had 4mm loudboy stuff that was heavy.
Original quote - expensive is a reflection of value and weight is relative. So no would be my answer.
I really don't get why people on here get into these cars and then advocate cutting corners each time they mod something....
And sound deadening does not need mass for it to work. Why are studio walls covered in 'egg box' foam? It needs a pattern and / or material to absorb the frequencies. It also depends what the resonant frequency of the material you are applying the deadening to. Check some of the simple tests you can see where a 1" square piece of Dynamat Xtreme renders a cymbal complete tuneless vs some of the other 'bargains' out there.....
Not really second skin isnt as expensive as dynamat nor is slient coat. Getting a better product isnt cutting cornors, dynamat just isnt that good. Loudboys 4mm stuff is great and cheap.
here is pic of his 4mm stuff vs damplifier pro
the 4mm stuff was used in my clio running a RE XXX 15" port tuned to 32hz. It was silly loud as it was facing the up so I got the horn effect aswell. No pannel ratttle. He also does a 2.5mm foil backed one.
If the doors where about 3 metres thick then yes soft absorbing materials are great but you dont have that option. Mass is generally the best way to stop panel rattle and sound deaden the areas. In a boot you could have a sub box and on the sides stuff it with towels. this does a great job of stopping vibrations but you cant do that on a door.
Also as Rob has said I personaly never found flashing tape to be great but that doesnt matter its messy. If your car is in the sun and you roll down the windows sometimes they get stuck and you get the glue on them. Personally in the last 12 months I havent seen anyone do anything with flashing tape. Generally its considerered crap.
All IMO of course.
So you managed to get it to stop noise at one frequency (ported tuned box to a particular frequency) - that doesn't mean it has sound deadening properties across a range of frequencies / volumes.... Having done SQ to Ultra level I have heard the differences. Albeit a huge part of the benefit of Dynamat Xtreme is the places you can get it. Just not sure why if the stuff is so good it isn't outselling Dynamat......??
People are brand whores simples. It hasnt stopped noise at a certain freq, it adds mass to the panels to stop them shaking. also you think a sub port tuned to 32hz can only play 32hz? damplifier pro, second skin, slient coat are all as good if not better for cheaper. Most people havent heard of them.