Silencer selection

I'm new to air rifle shooting and need advice on silencer selection. I understand that noisy comes from mechanical parts operation and by air blast from the barrel. I consider purchasing Walther air rifle with barrel thread. What would be the best type/model silencer and who is well known and trusted silencer maker? Thanks for help in advance.
 
I have watched the video ( https://donnyfl.com/pages/reviews) with Radio Shack db meter set to 80 db. Unfortunately, there was no explanation on how to interpret meter reading as far as noisy reduction perceived by ears. Measurement with out the silencer would be all the way to the right of scale. With second silencer model is around the middle of scale. 

Does the half scale mean noise is twice as low? 


 
http://www.silencertalk.com/forum/index.php



Go here for a good starting point. There is so much theory, material data, individually made cans and direction on producing them. Also, there are some air gun specific projects to dig for to scale the materials list down to air gun specific. Remember, you don’t need a tax stamp IF it cannot be used on a powder burner. Plus, you get to see the finished cans in action on video for some of them.
 
Displacement = the greater the displacement of the LDC the longer time it will take for the air to exit the muzzle spreading out the sound energy over a longer period of time. So displacement is directly related to delay.

Dampening = absorbing sound energy converts it into heat energy, reducing the muzzle report. Sound waves impinging on an object are either reflected, absorbed, or transferred. In most real life cases a combination of all three occur. The more sound energy absorbed lessons muzzle noise. This is where felt, foam, fiberglass, etc come into play. Aluminum and steel tend to transfer and reflect a lot of sound.

Delay = Anything you can do to slow the exit of gasses from the muzzle lowers the peak sound level but will extend the lengthen the muzzle report. Delay also importantly allows more time the gasses stay inside the gun so more sound reflection and absorption occurs, converting sound energy into heat. This is where baffles and displacement come into play.
 
Well... 

I don't intend to design a silencer. I'm looking for advice on selection of ready product based on experience of people who have it, and use it. Thanks for you explanation. Honestly, it is difficult for me to understand connection above explanation to actual model. It seems like a guide in general , and I appreciate that. 

Here is my interpretation. Correct me if I'm wrong.

1. The larger the volume (displacement) of silencer the better it delays gasses to exit (fancy word- muzzle report) muzzle by spreading energy inside the silencer. 

2. Silencer's body made of foam, fiberglass and other porous materials will better absorb energy of blast by converting it into heat. Silencer's body made of hard material like steel, aluminum, copper will reflect sound rather than absorb and transfer to heat.

3. The longer gasses stay inside the silencer, the longer the delay before exiting muzzle. 

4. Baffles (sort of partitions) a must part of silencer to dispense and absorb sound energy.

If my interpretation is even partially correct. WHAT SPECIFIC MODEL WOULD YOU PEOPLE ADVICE?