Thanks ! : )

Tolerable is what i thought too on the results i got. The intake are really cheaply made,and engineered. It's quite sad,because this thing is a an air pump with a steady rpm,they could adjust everything to have a silent,very effective pump.using sound waves,pulses,resonance,and all those cool things : )

There is a quiet air compressor on the market that uses two pistons. California air tools.

@@djmips For how expensive that company is they have a shitty warranty

if it were linear 5 db would actually be 50. because 2db is 10 times louder than 1 db. that is how they bade the scale.

@@roushhawley8438 No! Is logaritmic scale 1db=1 , 10db=10x, 20db=100x, 30db= 1000x.

Decibels refers to air pressure in absolute terms. It does NOT directly relate to human hearing. However a good rule of thumb is 10db SOUNDS half as loud to a human(frequency dependent as we are far less sensitive to low frequencies)

It's the same idea yes,muffling sounds.

: )

Thank you : ) His voice is prretty cool : )

I tried first to connect a Y fitting and join the two intakes to a common pipe first : no real benefit. I removed the stock air filtration ,but replaced it by a car air filter : kzfaq.info/get/bejne/qdh7dZCozNiomaM.html It's way more effective for sound reduction,and filtration, and act as a muffler. The shortest are the pipes going to the intake ,the less you have loss in air quantity,by friction, in the pipes. So i tried to limitate pipes length at the maximum,and got a very efficient filter compared to what it was. I watched your video,and what you did is working well too. To reduce even more the noise,you could get a complete car intake,wich is made of soft material compared to the metal boxes where your filters are. The metal conduct sounds,and vibrations,way more than the car intakes wich are designed to reduce a lot of induction noise. The key in sound reduction is to limitate vibration of your machine components themselves (so all the thin metallic plates,the cooling fins etc) ,and to cancel sound waves by not allowing them to travel out of the orifices by directing them in dead ends,or turning them against themselves. My brother have a yamaha 600 xt and there are rubber pads between the cooling fins on the engine head to reduce vibrations....it's an air cooled engine.

I talked for a bit in my original video about the filter cans possibly being a source of noise, since as you said, the flat metal covers could act like a sound radiating surface. I edited that part out because of time constraints. I hate having to do that, but I've found so many viewers get bored quickly and switch to a different video. I will remove the filters and see how much more sound reduction I get. Too bad I can't put a filter in the muffler because it does work well. An intake air box I guess would be the only other option.

Don't remove what YOU think is boring from your vids,it's your reflexion,your work,your creativity. Just try to get things interesting,your way. You should try to remove the whole filter assembly/housing : it's this whole part wich is vibrating and amplifying the noise like a membrane.

Thanks for the wisdom. I will also try the filter housing removal.

The tank may be ringing / resonating too; probably don't want to cover the whole tank (cooling) but could try putting undercoating on portions of it.

It's a good idea yes. The tank is a big vibrating piece,it wouldn't hurt to do that.

Thanks : )

Both at the same time ? No,didn't try,the air flow would suffer from it,that's would be quite some restriction,that's why i didn't even thought about it.

Bonjour,oui ça aiderait,merci : )

I will try to use a piece of hose with some foam stuffed in it to reduce the vent noise : ) 20 amps ? Is the wire big enough ? we have 16 and 20 amps breakers here for 2.5 mm² wiring. I think the max is 32 but with 4mm² wiring. I know when mine is starting,the lights in the house make weird things lol

ha ha yes im sure the lights do have a dance :-D. I think my frends compressor is not really for the house supply, it must be industrial. Although i see no reason why it cant be connected to the electric cooker outlet, plenty of amperes there :). It's better once warm, the spike of startup current is lower. The pressure release valve that's connected to the tank/head is working ok, so it should not struggle at start up.

That's why there is two decibel scale: C which is linear and treat all frequencies the same way, and A which is more in line with psychoacoustic response of human ear. So when comparing noise with different spectral densities, it should be done with A scale, not C like here.

Correct. But as i understood thanks to your remark,after research, on those scales and filters,it's far from being accurate as simple strict measurment. humans ears are physilogicals tools,and the owner have his own perception of a sound,whatever it is. A tool trying to use those complex factors as part of its measuring work with the use of filters is not completly objective (i think) a simpler more objective data is more appropriate at my low level of experimentation : ) it's just my opinion ,and i have really limited knowledge about sound. Thank you for your comment,i've learned something.

I love my wife she good to me we will be ha ppy if no one like it I don't give a fuck so hope you get the picture

As i know infra and ultra sonic aren't even detected by the human ears wich work between 20 hz to 20 000 hz at most. So,why those frequencies and sound energy would be a problem for our ears ,except to generate vibrations to the other objects around ,and produce other sounds eventually ?

Yes,a good honest 6 db,wich is quite a lot in person : )

A bit more than 4db with just an airbox and two hose is what i call effective. 81 db is low,you can talk next to it now without problems,it sway less stress. Using a fridge compressor is okay to fill up you bicycle tires,but very far from what this thing can do,like using a paint gun without problems,filling up 4 tires in a row etc...without waiting 10 minutes for it to fill up. Air flow is often way more important than pressure for standard use.

You do not know anything. Zero knowledge. Half loudless ( perceived by humans) of 81dB is 71dB, not 40.5dB, lol. For humans, +10dB is twice louder. At lower frequencies above 90dB levels, +5dB seems twice louder. Do you understand logarithmic scale?

You know that decibel is a logarithmic unit, right?

Stefano Crespi are we talking about the same thing? To quiet it down that little isnt worth an afternoon of drilling and modifying a compressor. Build a small box with eggcrate foam inside of it to reduce the noise you hear better than all this bs.

With the crappy equipment i have it took few hours,on the floor. you can do it in one hour,in a shop. You would be surprised how huge 4 dB are in real life for this thing.(4db at 2 meters...)

Everyone was easy on you because it's obvious you don't know what you're talking about. How do we know you don't know what you're talking about? You implied 5db isn't effective then suggested egg crate foam. That egg crate foam has nearly 0 acoustic properties.

@@michaelovitch- The sound reduction is quite impressive. But from the comments I would dare to say that most, you included, forget another benefit of this mod. Life expectancy of the equipment. ;-) I did similar long time ago on my compressor installed inside my workshop. Where I do a lot of mechanical, metal and even carpentry work. Over a short period in time you´ll be able to notice the huge amount of particles captured by the air filter. Meaning those particles didn´t went into the compressor. I ruffly estimate adding a few hundreds hours to the life of my cheap Chinese made compressor. 6 years have gone by and it¨s still running strong. ;-) Cheers