Deflex plads

[JeffM 10+ year member]

For those of you that use them, did you notice any difference?

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[quest51210 10+ year member]

lighter wallet

 

[JeffM 10+ year member]

They dont work? Then why do some many people recommend using them in the "Proper sound deadening" thread?

 

[Immacomputer 10+ year member]

I noticed quite a bit of difference by adding a deflex pad. It really smoothed out my midrange which was pretty nasty at the time. It also got rid of a ringing sound I was getting on some songs (mainly Moonlight Sonata and Vesti la Giubba - Pagliacci by Pavarotti).

 

[WhoSayWho? 5,000+ posts]

I noticed quite a bit of difference by adding a deflex pad. It really smoothed out my midrange which was pretty nasty at the time. It also got rid of a ringing sound I was getting on some songs (mainly Moonlight Sonata and Vesti la Giubba - Pagliacci by Pavarotti).

Did you already have a layer of closed cell foam behind the speaker? I have been wondering whether they accomplish substantially the same thing.

 

[FoxPro5 5,000+ posts]

Did you already have a layer of closed cell foam behind the speaker? I have been wondering whether they accomplish substantially the same thing.

They don't. Deflex (product of Cascade Audio Engineering, not the generic term) pads defract and scatter sound waves through the the series of concentric rings on the surface, thus reducing the amount of back wave cancellation. They are made from a low derometer rubber with isn't very good at sound wave absorption, but great for that particular application. They work best when installed directly behind the driver at 15* off axis from the radiating wave.

Closed-cell foam is an absorber and it's job depends directly on its thickness and the frequency in question. So, for your typical midrange driver playing from 50hz - 3khz a piece of 1" CC foam would get you down to about 1k at 100% absorption and then fractionally less as the wavelengths get longer.

 

[danz24 10+ year member]

I think it made the mids quieter, but sound nicer..dunno if that helps

 

[JeffM 10+ year member]

So would Closed Cell foam be better?

 

[nismos14 5,000+ posts]

er uh ... er..

 

[audioholic 5,000+ posts]

They don't. Deflex (product of Cascade Audio Engineering, not the generic term) pads defract and scatter sound waves through the the series of concentric rings on the surface, thus reducing the amount of back wave cancellation. They are made from a low derometer rubber with isn't very good at sound wave absorption, but great for that particular application. They work best when installed directly behind the driver at 15* off axis from the radiating wave.
Closed-cell foam is an absorber and it's job depends directly on its thickness and the frequency in question. So, for your typical midrange driver playing from 50hz - 3khz a piece of 1" CC foam would get you down to about 1k at 100% absorption and then fractionally less as the wavelengths get longer.

Im curious how you arrived at the numbers you did. For example, I know the actual density of the foam will affect its performance, yet you didn't seem to have that as part of your math.
Just curious thanks.

 

[WhoSayWho? 5,000+ posts]

You people and your math.

 

[J31Rob 5,000+ posts]

i don't even know what deflex is.

 

[Immacomputer 10+ year member]

Did you already have a layer of closed cell foam behind the speaker? I have been wondering whether they accomplish substantially the same thing.

No, I have no deadening done except for the pads. But like mentioned above, they do not function the same way.

 

[WhoSayWho? 5,000+ posts]

I am not sure that I can bring myself to buy Cascade, wasn't that the Cascade rep who thought he would be all sneaky and not identify himself when he joined here? I think he was questioning why Rudy's write up had not been updated and crap like that.

 

[Flipx99 5,000+ posts]

I used the second skin version with positive results.