PPI 1500 Damping > 50 -- WTF?

[theCybe 5,000+ posts]

Think that's a typo?

Looking at other amps, I see dampings

It's still an expensive amp - does it sound like sh!t?

How important is damping?

Is damping a key factor in choosing an SQ amp?

Click to read more...

 

[stones 10+ year member]

Oh REEEEQ where are you dear?

Someone is at the door.

 

[theCybe 5,000+ posts]

Req's probably busy shooting the rest of the movie >: )

Wanna chime in, Stones?

 

[stones 10+ year member]

I really don't pay attention to dampening factor as the manufacturers specs usually don't apply in any given install, the smallest things change the dampening factor of an amplifier to numbers no where near the manufacturers specifications.

it is also a really easy spec for the manufacturer to "fudge" for better consumer appeal.

Req and Jackfrost have all the techinal info on how it works.

 

[theCybe 5,000+ posts]

I googled a bit, and all I found was what I'd already presumed; Damping factor is the amplifier's ability at a given load to stop the woofer;

I was startled at such a low figure, and thought I'd look for testimony as to the performance of a product with a spec like that;

Of course what I want to hear is, "aw, it'll sound fine."

On the other hand, if it'll turn a kickdrum into a fart, I certainly won't buy it.

Five hours to go. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[thch 10+ year member]

I googled a bit, and all I found was what I'd already presumed; Damping factor is the amplifier's ability at a given load to stop the woofer;
I was startled at such a low figure, and thought I'd look for testimony as to the performance of a product with a spec like that;

Of course what I want to hear is, "aw, it'll sound fine."

On the other hand, if it'll turn a kickdrum into a fart, I certainly won't buy it.

Five hours to go. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

DF is defined as the ouptut impedance of the amp devided by the load impedance. one quick way of demonstrating its effects in the extreme is to unhook a speaker from the amp, then tap the cone. listen to the sound. this would be a DF of 0. now take a paperclip and connect it across the two speaker terminals. tap the cone. this would be a DF of about 100.

DF in excess of 100 are difficult to acheive because the wires to the speaker and before the VC have too much resistance.

DF is loosly the amps ability to stop the woofer. but the woofer still has a lot to say about that. an amp with an infinate DF will not be able to instantly stop a moving woofer. the self-damping of the speaker would be what to look for, and this is related to the Q paramters.

 

[theCybe 5,000+ posts]

^ Good first post, welcome to the forums. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[thch 10+ year member]

thanks. i enjoy posting on technical threads. I am an enginnering master student and a very technical person by nature. almost everything i know about my major was a result of audio, or car audio. lots of interesting stuff.

 

[JimJ 5,000+ posts]

Generally, you don't worry about DF unless you change the output devices - most solid-state amps have high DF's, while tube output stages have very low DF's with no negative feedback.

 

[adam71 5,000+ posts]

Generally, you don't worry about DF unless you change the output devices - most solid-state amps have high DF's, while tube output stages have very low DF's with no negative feedback.

So are you saying that solid state amps have negative feedback???