I intend to by CROWN 5002 for my sealed subwoofer system. Its rated 1300W per channel into 8 Ohm. it states a damping factor of 1000 , my question is that would it make significant sonic difference in bass,,,,what if i am compare it with krell FPB 600 ?
Significant difference... no
🙂
The damping factor is an electrical "specification" that is pretty meaningless when applied to real world installations. For an 8 ohm speaker that implies an output impedance of 0.008 ohms.
So the question is, how do you connect your speaker to the point in the amplifier that the damping factor is measured and quoted at. You need cables that will not add to the 0.008 ohms. Superconducting cables maybe 🙂
Only when damping factors are deliberately made low by an amplifier designer (say a DF of 20 or 30) might you begin to experience audible effects.
🙂
The damping factor is an electrical "specification" that is pretty meaningless when applied to real world installations. For an 8 ohm speaker that implies an output impedance of 0.008 ohms.
So the question is, how do you connect your speaker to the point in the amplifier that the damping factor is measured and quoted at. You need cables that will not add to the 0.008 ohms. Superconducting cables maybe 🙂
Only when damping factors are deliberately made low by an amplifier designer (say a DF of 20 or 30) might you begin to experience audible effects.
Higher damping = better control over the driver = less boom and lower distortion produced by the driver. But unless you have amp inside the same box as the driver it's hard to keep the R low with long cables and connectors on both ends.
Not at all.
DF = 1000 indicates that the amplifier has an output impedance of 8milli-ohms at the test frequency.
I guarantee that this same manufacturer will not be honest and reveal the DF over the range 10Hz to 40kHz.
Now implement a speaker circuit and make allowance for all the other resistances in that circuit.
The effective DF will now be <<1000 and could be as low as 20.
Just as good (and arguably better) to start with an amplifier with a DF = 80 +-10% over the 10Hz to 40kHz frequency range.
DF = 1000 indicates that the amplifier has an output impedance of 8milli-ohms at the test frequency.
I guarantee that this same manufacturer will not be honest and reveal the DF over the range 10Hz to 40kHz.
Now implement a speaker circuit and make allowance for all the other resistances in that circuit.
The effective DF will now be <<1000 and could be as low as 20.
Just as good (and arguably better) to start with an amplifier with a DF = 80 +-10% over the 10Hz to 40kHz frequency range.
It is not important.
Nelson Pass has designed some amplifiers with rather low DF.
Very good amplifiers.
Nelson Pass has designed some amplifiers with rather low DF.
Very good amplifiers.
I don't think that one can describe it in more detail than here:
Damping - Wikipedia, the free encyclopedia as well as here:
Damping factor - Wikipedia, the free encyclopedia
Damping - Wikipedia, the free encyclopedia as well as here:
Damping factor - Wikipedia, the free encyclopedia
Hi,
The DF values very high, are almost always obtained as a result in solving other things.
In my opinion, not to alter the instrumental timbre, especially the bass, the DF should not exceed 200. (i love DF range 40-100)
the woofer to reproduce the oscillations contained in the song, not the ones I make up myself, with super fast control.
Regards
The DF values very high, are almost always obtained as a result in solving other things.
In my opinion, not to alter the instrumental timbre, especially the bass, the DF should not exceed 200. (i love DF range 40-100)
the woofer to reproduce the oscillations contained in the song, not the ones I make up myself, with super fast control.
Regards
It is only a marketing thing. Do not even bother looking at/thinking about this specification, as it cannot tell you anything meaningful.
In most cases a "Damping Factor" of 5 will be acceptable.
In all cases a "Damping Factor" of 10 will be good.
http://www.cartchunk.org/audiotopics/DampingFactor.pdf
In all cases a "Damping Factor" of 10 will be good.
http://www.cartchunk.org/audiotopics/DampingFactor.pdf
That is very much dependent on the loudspeaker system. On all my loudspeakers, too much damping means overly lean bass.
dave
But if you can put together a speaker system that works with an amp with damping factor less than 1 (and a flat impedance curve) you can reap all sorts of benefits.
dave
No it means the correct bass you should be hearing. What you like hearing is the boom and thus distortion and you perceive this as more bass. Passive crossovers and low damping is what cause this.
That is patently false -- just the opposite. Just ask anyone who knows my taste or has built any of designs.
Here is a comment: http://www.diyaudio.com/forums/multi-way/100392-beyond-ariel-825.html#post3208104
Bud borrowed these and when he said he wasn't bring them back we had to make a deal.
You know not of what you speak. As has been stated, and obviously you have not gotten it, is that it is the system transfer function that counts, no matter how you get yourself there.
You seem to have painted yourself into a corner of all the possibilities and that is your whole world.
And BTW, most of my speakers have no crossovers at all, and if they do, they are more often than not at line level.
dave
Damping factor is terribly important as a number that can be tossed out by marketing people to impress folks who don't understand amplifiers.
For your question, we again have to say, it is irrelevant. If someone advertises a high DF, then I say it has a very high global feedback and may not have a sufficient output isolation circuit. Anything over about 20 is just fine.
For your question, we again have to say, it is irrelevant. If someone advertises a high DF, then I say it has a very high global feedback and may not have a sufficient output isolation circuit. Anything over about 20 is just fine.
Assuming copper voice coil wiring, replacing the amplifier with a damping factor of 1000 with an amplifier with a damping factor of 100 would have about the same effect on the sound as a 2.1 degree C (3.8 degree F) increase in voice coil temperature.
It's a caos.
how you adjust good DF ,if have huge feedback?
maybe is better not touch this key.
In theory, it should have a DF, for each type of speaker, frequency-dependent, then dimensions of the mobile part, etc. Because it is not simple (or not possible), it would be better to keep a low DF. obviously, this is my opinion hehe.
how you adjust good DF ,if have huge feedback?
maybe is better not touch this key.
In theory, it should have a DF, for each type of speaker, frequency-dependent, then dimensions of the mobile part, etc. Because it is not simple (or not possible), it would be better to keep a low DF. obviously, this is my opinion hehe.
The damping factor of an amplifier at a given frequency reflects its outpout impedance at that frequency.
The curve of the output impedance towards frequency can be established and an equivalent network set up. Then in simulation adding this network in series with the impedance equivalent network of the loudspeaker can show its influence on the voltage applied across it.
The loudspeaker must not be taken out of the equation.
The curve of the output impedance towards frequency can be established and an equivalent network set up. Then in simulation adding this network in series with the impedance equivalent network of the loudspeaker can show its influence on the voltage applied across it.
The loudspeaker must not be taken out of the equation.
rubbish !
All bass resonance systems have some damping associated with the "speaker" system.
All have some resistance providing at least some damping.
All will have some added circuit resistance providing more damping.
All will require a different amount of circuit resistance to arrive at the "correct" damping for that particular "system"..
It is a complete nonsense to suggest that near zero added circuit resistance is the only correct way to set up the bass resonance damping.
Last edited:
- Status
- Not open for further replies.