[ServinginEcuador]

Quote:

Originally posted by Joe Bloggs Wrong... it's 3am 1/1/2003 here and I can't think of anything more to say / explain Happy new year

Well then, Happy New Year to you too then!!

OBTW, nice new avatar Joe!!! Kinda cool.

 

[Joe Bloggs]

Let's see... after sleeping... a proper answer to fredpb...

Well, let's just say that if you take care of the voltage, the current will take care of itself, ok?

Say the music and volume demands that you put 1V through the transducers at 100Hz. Without the impedance hump, there would be a high current draw that the amp may not be able to handle. With the impedance hump, there would be a lower current draw that the amp can handle.

Now if you say that bass *still* requires a lot of current, that would mean that it requires an even higher voltage to drive to the required volume.

But the frequency response graph shows that with, say, 1V across the transducers at all frequencies, the HD580 have more than enough response in the 100Hz region. You don't need to deliberately provide more voltage and current at that frequency to get enough of 100Hz. (which, by the way, would be called equalization.

)

And Happy New Year again

 

[fredpb]

Sorry Wrong again.

You can be happy with your opinon.

I will stick with mine.

 

[wallijonn]

from http://www.transcendentsound.com/amp..._impedance.htm :

The function of a speaker is to produce a constant sound pressure level for a constant drive voltage across a defined frequency range. Power is calculated as voltage multiplied by current. If the loudspeaker impedance drops and the amplifier voltage is held constant, then the current in the loudspeaker increases (current = voltage ÷ impedance). If the current increases, then doesn’t the power consumed increase? Yes! That is exactly what happens. If the power in the loudspeaker increases, then why doesn’t it play louder? Because the speaker efficiency is changing. As the speaker impedance decreases, its efficiency decreases. All that matters is that the acoustic output remain constant.

Speaker enclosures are “tuned” to “load” the woofer cone at a particular frequency- the frequency of system resonance. Look at a typical bass reflex speaker impedance graph. There is always a very high impedance peak at system resonance. At this frequency, the speaker efficiency goes way up. The cone will move with great amplitude and make very boomy bass. The enclosure and port system are tuned to mass load the cone at this frequency. They put the brakes on the cone motion. The wild cone motion is controlled and the acoustic output is held constant.

This is the way loudspeakers behave. Loudspeakers are not constant power devices. Loudspeakers must have a constant drive voltage to provide a constant acoustic output with changing frequency.

 

[fredpb]

Yeah. Speakers. I have read a lot of books about this stuff since about 1968. That is when I was first trained in electronics.

Education about electronics is nice. You can always learn by listening though.

The HD600's I had frustrated me for a long time. I knew a good thing when I saw it, but did not like the low end.

Right now, after a few amps, I am tolerant of my phones. I am a bit disappointed at my Premium Little/HD580/Cambridge Audio 500 SE Rig. But like my HD600 rig with MG Head OTL (in transformer mode), Rega Planet, and turntable.

The Senns sound ok with a brutal break in. After hearing the difference with the 580's I rebrokein the HD600's. Nicer.

But it takes finess to get the Senns to sound complete. I have not gotten their 100% yet. I have Clou reds on the 600's. Wish I had something like that on the 580's.

But my phones took a back seat to developing my new computer gaming system, which is now becoming a video system as well.

Toys toys toys.

Every one knows that the statement "you need an amp to make them sound good" really applies well to the 580's 600's. WHY?
You need to pump power into that impedence hump at 100 hz, plus the amp just needs it.

Pretty covered books, and fancy articles on the net won't change the fact that you need to power the Senn's to overcome that hump. Magic and mirrors.