Drone vs. Resonance Question
Team Owner
Joined: Oct 2004
Posts: 27,420
Likes: 64
From: San Clemente CA
Originally Posted by SA HEAT
If you're 50 years or older it's drone. If you're under 50 it's resonance.
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Originally Posted by achilds
Not to belabor the point, but I don't think intakes have much to do with resonance. The resonant frequency in a pipe is simply the speed of sound divided by twice the length of the pipe, f=Vsound/2*L. The speed of sound is 340 meters/sec. If the exhaust pipe is about a meter then you are looking at something like 170 hz. As a reference concert A is 440 hz, so you are hearing a "note" like a D,E, or F an octave or two below concert A. The higher the amplitude of the standing wave corresponds to more resonance in the cabin. To bad it doesn't sound like a concert.
Interestingly I noticed a difference in the exhaust note and some resonance on a 92 I had when I installed a K&N filter and opened the air intake are on the box. Those were the only things I did. The sound got lower and deffinatley louder.
Melting Slicks
Joined: Oct 2005
Posts: 2,515
Likes: 3
From: Goleta California
Originally Posted by Zig
but wouldn't the amount of air being passed though the pipe effect it's resonant frequency ? if a flute player blows whisps of air it will sound one way but if he/she blew a large volume as a burst into the same flute it willl sound different.
Safety Car
Joined: Jun 2005
Posts: 4,905
Likes: 569
From: Bucks County PA
I am going to skip the technical stuff.
DRONE (I had B&B Bullets so I know drone) is a DEEP BASSY HUM that reverberates in your ears and head. It literally feels like pressure, like your head is going to explode. With the Bullets it was a LOUD DEEP BASSY HUM. felt like someone was putting a plunger over my ears and going for all it is worth.
RESONANCE would be when the sound of the car makes the car's interior parts BUZZ.
Do not confuse drone with the mellow hum of a V8, it is two different things.
My new Magnaflow exhaust (although not quite aggressive enough for me) does not drone at all, but it has a smooth and mellow V8 hum at all times, whereas the Bullets DRONED all the time.
Put to a choice, I will tolerate the Magnaflows lack of aggressiveness more than I will tolerate the Bullets drone.
It is always a compromise.
Agressive great sound, loud and droney vs Mellow decent (but not great) sound, not as loud, and smooth.
Howard
DRONE (I had B&B Bullets so I know drone) is a DEEP BASSY HUM that reverberates in your ears and head. It literally feels like pressure, like your head is going to explode. With the Bullets it was a LOUD DEEP BASSY HUM. felt like someone was putting a plunger over my ears and going for all it is worth.
RESONANCE would be when the sound of the car makes the car's interior parts BUZZ.
Do not confuse drone with the mellow hum of a V8, it is two different things.
My new Magnaflow exhaust (although not quite aggressive enough for me) does not drone at all, but it has a smooth and mellow V8 hum at all times, whereas the Bullets DRONED all the time.
Put to a choice, I will tolerate the Magnaflows lack of aggressiveness more than I will tolerate the Bullets drone.
It is always a compromise.
Agressive great sound, loud and droney vs Mellow decent (but not great) sound, not as loud, and smooth.
Howard
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Team Owner
Joined: Mar 2006
Posts: 53,282
Likes: 3
From: God Bless America
Originally Posted by yell03
I am going to skip the technical stuff.
DRONE (I had B&B Bullets so I know drone) is a DEEP BASSY HUM that reverberates in your ears and head. It literally feels like pressure, like your head is going to explode. With the Bullets it was a LOUD DEEP BASSY HUM. felt like someone was putting a plunger over my ears and going for all it is worth.
RESONANCE would be when the sound of the car makes the car's interior parts BUZZ.
Do not confuse drone with the mellow hum of a V8, it is two different things.
My new Magnaflow exhaust (although not quite aggressive enough for me) does not drone at all, but it has a smooth and mellow V8 hum at all times, whereas the Bullets DRONED all the time.
Put to a choice, I will tolerate the Magnaflows lack of aggressiveness more than I will tolerate the Bullets drone.
It is always a compromise.
Agressive great sound, loud and droney vs Mellow decent (but not great) sound, not as loud, and smooth.
Howard
DRONE (I had B&B Bullets so I know drone) is a DEEP BASSY HUM that reverberates in your ears and head. It literally feels like pressure, like your head is going to explode. With the Bullets it was a LOUD DEEP BASSY HUM. felt like someone was putting a plunger over my ears and going for all it is worth.
RESONANCE would be when the sound of the car makes the car's interior parts BUZZ.
Do not confuse drone with the mellow hum of a V8, it is two different things.
My new Magnaflow exhaust (although not quite aggressive enough for me) does not drone at all, but it has a smooth and mellow V8 hum at all times, whereas the Bullets DRONED all the time.
Put to a choice, I will tolerate the Magnaflows lack of aggressiveness more than I will tolerate the Bullets drone.
It is always a compromise.
Agressive great sound, loud and droney vs Mellow decent (but not great) sound, not as loud, and smooth.
Howard
