JD1000/1 and impedance rise question!!

[shredder1 10+ year member]

Frank, quit.

Who TF is Frank btw?

 

[shredder1 10+ year member]

for

In a silent sound room with no noise, 3 db (roughly 33%). In a car, about 10-15% Theoretical doubling of the sound to the ear requires more than an 8:1 ratio of power to realize a doubling of the volume to the ear. The math actually reads like this.
The ear perceives a doubling of the volume at roughly 9-10 db. Starting with a base line at 500 watts of input power, the math looks like this:
500 to 1000 watts, you get a 3 db gain or a 33% increase in volume.
1000 to 2000 watts, another 3 db gain or a 66% increase in volume
2000 to 4000 watts, another 3 db gain or a 99% increase, a doubling of the volume to the ear. That is a 8:1 ratio, in a perfectly quiet chamber with a mic placed 1 meter from the speaker.
So whether it’s the same wattage to a speaker that is 3 db more efficient or the same efficiency with increased power, the math applies either way. In a car environment, it will be much less that these results obtained in an sound testing room. Therefore, expect maybe a 15% difference all things being equal.

I have to agree, even in a heavily deadened cabin it took like 2x power /w/ 20% more cone to gain 6 db and that was only after cabin work... lol. From 2-12s to a single 18. Nothing makes sense about the gains I enjoyed. 146ish to a solid 152 on less power with a touch more cone. My windshield, hood and wipers bore testament to the gains. Forget the rearview... I epoxied that and just watched the wipers jump and hood flex. Whether the dash was jumping was always a debate, too much debris falling down from the front of the headliner to tell anyway... lol. My sunshades were demo survivors... the wipers just slapped.
Talking about a 500w to 1000w output difference is making me reminisce about those low power/hi efficiency days. Nowadays competing 3K stock and 152 seems ok.
I loved low power/hi efficiency... somehow I knew what worked.
I nailed my 1st 150 back in 1995 on 150w

 

[1point21gigawatts]

You are not even trying to grasp the information. Pearls before swine.

I only show my pearls to swine if they stomp me like that. That’s what My Father taught me. Don’t do that.

 

[1point21gigawatts]

Don't blasphemous Word.

 

[1point21gigawatts]

Anything past 140db, every 3db is a 100% increase in sound. Doubles every 3db until you get to 165db and it stops because the human ear can’t hear over 165db. The meters glitch at 3 different points in the 150s depending on the frequency and shoot up to a crazy number that is error. The human ear can only hear 1db difference but most people can only hear 2db difference. And 3db is double the sound after 140db. Magnetic fluctuation is how the speed of sound is met. Luminous fluctuation is how the speed of light is met.

 

[1point21gigawatts]

 

[1point21gigawatts]

Dang, them olive oil girls be gettin it in. Y’all premium guys is missin out.

 

[1point21gigawatts]

Ballpark figuring.

 

[1point21gigawatts]

See? peep the resistances.

 

[1point21gigawatts]

2 girls and 2 bottles coming from the shredder with resistance but no impedance and 2 girls and 2 bottles coming from The Christ with no resistance. Makes even the smartest humans in the world think twice and until 3 is too much.

 

[shredder1 10+ year member]

2 girls and 2 bottles coming from the shredder with resistance but no impedance and 2 girls and 2 bottles coming from The Christ with no resistance. Makes even the smartest humans in the world think twice and until 3 is too much.

And your point is? I read that you touched on the logarithmic scale earlier in the thread.
Shredder says...

No hate directed your way but confusion on your message.

 

[metalheadjoe 10+ year member]

Come now; quit being a tease and just tell us. I'll tell you my take on it. Resistance is a set value, impedance is a reactive resistance.

Half the people will tell me I'm wrong.

Impedance changes when frequency changes.

 

[spokey9 5,000+ posts]

Half the people will tell me I'm wrong.

Impedance changes when frequency changes.

Impedence changes as the cone moves too

 

[Jimi77 Premium Member]

Impedence changes as the cone moves too

And it changes as power input changes too.

 

[1aespinoza Premium Member]

Impedance changes when frequency changes.

I saw that Doc. Brown's chart alludes to that.